Batteries

18 pages, 431 KiB

Open AccessArticle

Efficient Reallocation of BESS in Monopolar DC Networks for Annual Operating Costs Minimization: A Combinatorial-Convex Approach

by Luis Fernando Grisales-Noreña, Oscar Danilo Montoya and Jesús C. Hernández

Batteries 2023, 9(3), 190; https://doi.org/10.3390/batteries9030190 - 22 Mar 2023

Cited by 4 | Viewed by 1912

Abstract

This article deals with the solution of a mixed-integer nonlinear programming (MINLP) problem related to the efficient reallocation of battery energy storage systems (BESS) in monopolar direct current (DC) grids through a master–slave optimization approach. The master stage solves the integer nature of [...] Read more.

This article deals with the solution of a mixed-integer nonlinear programming (MINLP) problem related to the efficient reallocation of battery energy storage systems (BESS) in monopolar direct current (DC) grids through a master–slave optimization approach. The master stage solves the integer nature of the MINLP model, which is related to the nodes where the BESS will be located. In this stage, the discrete version of the vortex search algorithm is implemented. To determine the objective function value, a recursive convex approximation is implemented to solve the nonlinear component of the MINLP model (multi-period optimal power flow problem) in the slave stage. Two objective functions are considered performance indicators regarding the efficient reallocation of BESS in monopolar DC systems. The first objective function corresponds to the expected costs of the annual energy losses, and the second is associated with the annual expected energy generation costs. Numerical results for the DC version of the IEEE 33 bus grid confirm the effectiveness and robustness of the proposed master–slave optimization approach in comparison with the solution of the exact MINLP model in the General Algebraic Modeling System (GAMS) software. The proposed master–slave optimizer was programmed in the MATLAB software. The recursive convex solution of the multi-period optimal power flow problem was implemented in the convex discipline tool (CVX) with the SDPT3 and SEDUMI solvers. The numerical reductions achieved with respect to the benchmark case in terms of energy loss costs and energy purchasing costs were

7.2091 %

and

3.2105 %

, which surpassed the results reached by the GAMS software, with reductions of about

6.0316 %

and

1.5736 %

. Full article

(This article belongs to the Collection Advances in Battery Energy Storage and Applications)

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25 pages, 10489 KiB

Open AccessArticle

Investigation of the Electrochemical Behaviour of Al Current Collector Material Polarised Highly Anodically and Located in Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide Room-Temperature Ionic Liquid

by Jaanus Kruusma, Tanel Käämbre, Arvo Tõnisoo, Vambola Kisand, Karmen Lust and Enn Lust

Batteries 2023, 9(3), 189; https://doi.org/10.3390/batteries9030189 - 22 Mar 2023

Viewed by 1543

Abstract

The electrochemical behaviour of Al, used as a current collector in supercapacitors and in Li-ion and Na-ion electrochemical power sources, was investigated for the first time using the in situ soft X-ray photoelectron spectroscopy (XPS) method, collecting the information directly at the electrolyte-covered [...] Read more.

The electrochemical behaviour of Al, used as a current collector in supercapacitors and in Li-ion and Na-ion electrochemical power sources, was investigated for the first time using the in situ soft X-ray photoelectron spectroscopy (XPS) method, collecting the information directly at the electrolyte-covered Al current collector polarised electrochemically at high anodic potentials. Cyclic voltammetry, electrochemical impedance spectroscopy, and synchrotron in situ soft XPS methods were applied to collect physical and electrochemical information characterising the electrochemically polarised Al-current-collector RTIL interface soaked into the butyltrimethylammonium bis(trifluoromethylsulfonyl)imide (N4111(TFSI)) room-temperature ionic liquid. The obtained data show the start of intensive oxidation processes, including aluminium oxidation and the formation of an insoluble Al(TFSI)₃ surface layer in N4111(TFSI) at E ≥ 3.0 V (vs. Ag-QRE). Very intensive electro-oxidation of TFSI⁻ anions at E ≥ 6.5 V (vs. Ag-QRE) has been observed. CV data indicate that the electrochemical oxidation of once-activated Al is possible in N4111(TFSI) at 1.1 V < E < 1.6 V (vs. Ag-QRE). Therefore, the oxidation of Al starts at E ≥ 2.05 V (vs. Ag-QRE) if the Al surface is modified with electro-oxidation products of TFSI⁻ anions. Full article

(This article belongs to the Special Issue Operando, In Situ and Ex Situ Studies of Battery Materials)

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13 pages, 6058 KiB

Open AccessFeature PaperArticle

Pulsed Current Constructs 3DM Cu/ZnO Current Collector Composite Anode for Free-Dendritic Lithium Metal Batteries

by Zhenkai Zhou, Qiang Chen, Yang Wang, Guangya Hou, Jianli Zhang and Yiping Tang

Batteries 2023, 9(3), 188; https://doi.org/10.3390/batteries9030188 - 22 Mar 2023

Cited by 5 | Viewed by 2592

Abstract

Although lithium metal is an ideal anode material for achieving high-energy-density lithium-based batteries, the uneven deposition/exfoliation process of lithium during cycling easily triggers the formation of lithium dendrites and dead lithium, which leads to a low Coulombic efficiency and safety issues. In this [...] Read more.

Although lithium metal is an ideal anode material for achieving high-energy-density lithium-based batteries, the uneven deposition/exfoliation process of lithium during cycling easily triggers the formation of lithium dendrites and dead lithium, which leads to a low Coulombic efficiency and safety issues. In this paper, a lithiophilic 3D copper mesh current collector is designed by using lithiophilic ZnO and pulsed current plating and is applied to a lithium metal battery composite anode. Under the action of the pulsed current field, the novel lithium metal composite anode battery achieved the homogeneous deposition of lithium ions. The lithium-to-copper half cells assembled with the 3DM Cu/ZnO current collector from the pulsed current deposition presented a Coulombic efficiency as high as 97.8% after 1 min of activation at 3 mA cm⁻² follow by 10 cycles at a stripping current of 0.5 mA cm⁻². Moreover, the symmetric cell could be stable for 1500 h at 1 mA cm⁻² with a limited capacity of 1 mAh cm⁻², and the assembled full cell (LiFePO₄ as the cathode) maintained a Coulombic efficiency of about 90% for the 30th cycle at 1 C. This novel mechanism is an advanced strategy to improve cyclic stability and is crucial for designing stable lithium metal batteries. Full article

(This article belongs to the Section Battery Materials and Interfaces: Anode, Cathode, Separators and Electrolytes or Others)

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29 pages, 47772 KiB

Open AccessArticle

An Accurate Activate Screw Detection Method for Automatic Electric Vehicle Battery Disassembly

by Huaicheng Li, Hengwei Zhang, Yisheng Zhang, Shengmin Zhang, Yanlong Peng, Zhigang Wang, Huawei Song and Ming Chen

Batteries 2023, 9(3), 187; https://doi.org/10.3390/batteries9030187 - 21 Mar 2023

Cited by 12 | Viewed by 3134

Abstract

With the increasing popularity of electric vehicles, the number of end-of-life (EOF) electric vehicle batteries (EVBs) is also increasing day by day. Efficient dismantling and recycling of EVBs are essential to ensure environmental protection. There are many types of EVBs with complex structures, [...] Read more.

With the increasing popularity of electric vehicles, the number of end-of-life (EOF) electric vehicle batteries (EVBs) is also increasing day by day. Efficient dismantling and recycling of EVBs are essential to ensure environmental protection. There are many types of EVBs with complex structures, and the current automatic dismantling line is immature and lacks corresponding dismantling equipment. This makes it difficult for some small parts to be disassembled precisely. Screws are used extensively in batteries to fix or connect modules in EVBs. However, due to the small size of screws and differences in installation angles, screw detection is a very challenging task and a significant obstacle to automatic EVBs disassembly. This research proposes a systematic method to complete screw detection called “Active Screw Detection”. The experimental results show that with the YOLOX-s model, the improved YOLOX model achieves

95.92 %

and

92.14 %

accuracy for both

m A P_{50}

and

m A P_{75}

positioning after autonomous adjustment of the robotic arm attitude. Compared to the method without autonomous adjustment of the robotic arm,

m A P_{50}

and

m A P_{75}

improved by

62.81 %

and

57.67 %

, respectively. In addition, the improved YOLOX model improves

m A P_{50}

and

m A P_{75}

by

0.19 %

and

3.59 %

, respectively, compared to the original YOLOX model. Full article

(This article belongs to the Special Issue Recycling of Lithium-Ion Batteries: Current Status and Future Outlook)

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49 pages, 15657 KiB

Open AccessFeature PaperEditor’s ChoiceReview

All-Solid-State Thin Film Li-Ion Batteries: New Challenges, New Materials, and New Designs

by Baolin Wu, Chunguang Chen, Dmitri L. Danilov, Rüdiger-A. Eichel and Peter H. L. Notten

Batteries 2023, 9(3), 186; https://doi.org/10.3390/batteries9030186 - 21 Mar 2023

Cited by 15 | Viewed by 10461

Abstract

All-solid-state batteries (ASSBs) are among the remarkable next-generation energy storage technologies for a broad range of applications, including (implantable) medical devices, portable electronic devices, (hybrid) electric vehicles, and even large-scale grid storage. All-solid-state thin film Li-ion batteries (TFLIBs) with an extended cycle life, [...] Read more.

All-solid-state batteries (ASSBs) are among the remarkable next-generation energy storage technologies for a broad range of applications, including (implantable) medical devices, portable electronic devices, (hybrid) electric vehicles, and even large-scale grid storage. All-solid-state thin film Li-ion batteries (TFLIBs) with an extended cycle life, broad temperature operation range, and minimal self-discharge rate are superior to bulk-type ASSBs and have attracted considerable attention. Compared with conventional batteries, stacking dense thin films reduces the Li-ion diffusion length, thereby improving the rate capability. It is vital to develop TFLIBs with higher energy density and stability. However, multiple challenges, such as interfacial instability, low volumetric energy density, and high manufacturing cost, still hinder the widespread application of TFLIBs. At present, many approaches, such as materials optimization and novel architecture design, have been explored to enhance the stability and energy density of TFLIBs. An overview of these discoveries and developments in TFLIBs is presented in this review, together with new insights into the intrinsic mechanisms of operation; this is of great value to the batteries research community and facilitates further improvements in batteries in the near future. Full article

(This article belongs to the Special Issue Advancements towards Practical All-Solid-State Batteries)

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31 pages, 5611 KiB

Open AccessReview

Survey on Battery Technologies and Modeling Methods for Electric Vehicles

by Mehroze Iqbal, Amel Benmouna, Mohamed Becherif and Saad Mekhilef

Batteries 2023, 9(3), 185; https://doi.org/10.3390/batteries9030185 - 20 Mar 2023

Cited by 9 | Viewed by 6542

Abstract

The systematic transition of conventional automobiles to their electrified counterparts is an imperative step toward successful decarbonization. Crucial advances in battery storage systems (BSS) and related technologies will enable this transition to proceed smoothly. This requires equivalent developments in several interconnected areas, such [...] Read more.

The systematic transition of conventional automobiles to their electrified counterparts is an imperative step toward successful decarbonization. Crucial advances in battery storage systems (BSS) and related technologies will enable this transition to proceed smoothly. This requires equivalent developments in several interconnected areas, such as complete battery cycles and battery management systems (BMS). In this context, this article critically examines state-of-the-art battery technologies from the perspective of automakers, provides insightful discussions, and poses open questions with possible answers. The generations of BSS (traditional, current, and futuristic) are first reviewed and analyzed via two distinct qualitative factors (DQFs): key design markers and performance indicators. Based on the introduced DQFs, major development trends and probable evolutions are forecasted. Thereafter, recent modeling and state estimation methods are comprehensively reviewed in relation to high-performance BMS. Accordingly, promising modeling methods are identified as futuristic solutions, leading to an accurate and timely decision for reliable and safer user experience. This article is concluded by presenting a techno-economic assessment of what to expect, as well as highlighting future challenges and opportunities for industry, academia, and policy makers. Full article

(This article belongs to the Special Issue Feature Papers to Celebrate the First Impact Factor of Batteries)

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23 pages, 1866 KiB

Open AccessReview

Electrode Fabrication Techniques for Li Ion Based Energy Storage System: A Review

by Veena Singh, Sudhanshu Kuthe and Natalia V. Skorodumova

Batteries 2023, 9(3), 184; https://doi.org/10.3390/batteries9030184 - 20 Mar 2023

Cited by 8 | Viewed by 4806

Abstract

Development of reliable energy storage technologies is the key for the consistent energy supply based on alternate energy sources. Among energy storage systems, the electrochemical storage devices are the most robust. Consistent energy storage systems such as lithium ion (Li ion) based energy [...] Read more.

Development of reliable energy storage technologies is the key for the consistent energy supply based on alternate energy sources. Among energy storage systems, the electrochemical storage devices are the most robust. Consistent energy storage systems such as lithium ion (Li ion) based energy storage has become an ultimate system utilized for both domestic and industrial scales due to its advantages over the other energy storage systems. Considering the factors related to Li ion-based energy storage system, in the present review, we discuss various electrode fabrication techniques including electrodeposition, chemical vapor deposition (CVD), stereolithography, pressing, roll to roll, dip coating, doctor blade, drop casting, nanorod growing, brush coating, stamping, inkjet printing (IJP), fused deposition modelling (FDM) and direct ink writing (DIW). Additionally, we analyze the statistics of publications on these fabrication techniques and outline challenges and future prospects for the Li ion battery market. Full article

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13 pages, 5822 KiB

Open AccessArticle

Investigation on the Air Stability of P2-Layered Transition Metal Oxides by Nb Doping in Sodium Ion Batteries

by Yanyan Chen, Qinhao Shi, Shengyu Zhao, Wuliang Feng, Yang Liu, Xinxin Yang, Zhenwei Wang and Yufeng Zhao

Batteries 2023, 9(3), 183; https://doi.org/10.3390/batteries9030183 - 20 Mar 2023

Cited by 4 | Viewed by 2416

Abstract

Sodium-ion batteries are regarded as a substitution for lithium-ion batteries for its abundant resources, wide distribution, low cost, etc. The P2-layered sodium transition metal oxides (P2-Na_xTMO₂) have attracted extensive attention due to their high rate and cycling properties. However, [...] Read more.

Sodium-ion batteries are regarded as a substitution for lithium-ion batteries for its abundant resources, wide distribution, low cost, etc. The P2-layered sodium transition metal oxides (P2-Na_xTMO₂) have attracted extensive attention due to their high rate and cycling properties. However, P2-Na_xTMO₂ often undergoes structural transformations when exposed in ambient air, which restricts its practical applications. Herein we studied the effect of Nb doping on the air stability of P2-Na_xTMO₂. We demonstrated that the Nb-induced surface preconstructed layer inhibited the surface dissolution of the P2 material in the electrochemical reaction and formed a stable and thin (cathode–electrolyte interphase) CEI film, which prevented water molecules from entering the P2-Na_xTMO₂ lattice. Na_0.67Mn_0.67Ni_0.33Nb_0.03O₂ could exhibit superior rate performance (a reversible capacity of 72.5 mAh g⁻¹ at 20 C) and outstanding cycling performance (84.43% capacity retention after 1000 cycles at 5 C) in a half cell after exposed in a moisture atmosphere (RH93%) for 20 days. Full article

(This article belongs to the Special Issue High-Performance Materials for Sodium-Ion Batteries)

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19 pages, 7127 KiB

Open AccessArticle

In Situ Metal Organic Framework (ZIF-8) and Mechanofusion-Assisted MWCNT Coating of LiFePO₄/C Composite Material for Lithium-Ion Batteries

by Priyatrisha Mathur, Jeng-Ywan Shih, Ying-Jeng James Li, Tai-Feng Hung, Balamurugan Thirumalraj, Sayee Kannan Ramaraj, Rajan Jose, Chelladurai Karuppiah and Chun-Chen Yang

Batteries 2023, 9(3), 182; https://doi.org/10.3390/batteries9030182 - 20 Mar 2023

Cited by 9 | Viewed by 2787

Abstract

LiFePO₄ is one of the industrial, scalable cathode materials in lithium-ion battery production, due to its cost-effectiveness and environmental friendliness. However, the electrochemical performance of LiFePO₄ in high current rate operation is still limited, due to its poor ionic- and electron-conductive [...] Read more.

LiFePO₄ is one of the industrial, scalable cathode materials in lithium-ion battery production, due to its cost-effectiveness and environmental friendliness. However, the electrochemical performance of LiFePO₄ in high current rate operation is still limited, due to its poor ionic- and electron-conductive properties. In this study, a zeolitic imidazolate framework (ZIF-8) and multiwalled carbon nanotubes (MWCNT) modified LiFePO₄/C (LFP) composite cathode materials were developed and investigated in detail. The ZIF-8 and MWCNT can be used as ionic- and electron-conductive materials, respectively. The surface modification of LFP by ZIF-8 and MWCNT was carried out through in situ wet chemical and mechanical alloy coating. The as-synthesized materials were scrutinized via various characterization methods, such as XRD, SEM, EDX, etc., to determine the material microstructure, morphology, phase, chemical composition, etc. The uniform and stable spherical morphology of LFP composites was obtained when the ZIF-8 coating was processed by the agitator [A], instead of the magnetic stirrer [MS], condition. It was found that the (optimum of) 2 wt.% ZIF-8@LFP [A]/MWCNT composite cathode material exhibited outstanding improvement in high-rate performance; it maintained the discharge capacities of 125 mAh g⁻¹ at 1C, 110 mAh g⁻¹ at 3C, 103 mAh g⁻¹ at 5C, and 91 mAh g⁻¹ at 10C. Better cycling stability with capacity retention of 75.82% at 1C for 100 cycles, as compared to other electrodes prepared in this study, was also revealed. These excellent results were mainly obtained because of the improvement of lithium-ion transport properties, less polarization effect, and interfacial impedance of the LFP composite cathode materials derived from the synergistic effect of both ZIF-8 and MWCNT coating materials. Full article

(This article belongs to the Special Issue High Energy Lithium-Ion Batteries)

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23 pages, 10317 KiB

Open AccessArticle

A Data-Driven LiFePO₄ Battery Capacity Estimation Method Based on Cloud Charging Data from Electric Vehicles

by Xingyu Zhou, Xuebing Han, Yanan Wang, Languang Lu and Minggao Ouyang

Batteries 2023, 9(3), 181; https://doi.org/10.3390/batteries9030181 - 20 Mar 2023

Cited by 9 | Viewed by 4093

Abstract

The accuracy of capacity estimation is of great importance to the safe, efficient, and reliable operation of battery systems. In recent years, data-driven methods have emerged as promising alternatives to capacity estimation due to higher estimation accuracy. Despite significant progress, data-driven methods are [...] Read more.

The accuracy of capacity estimation is of great importance to the safe, efficient, and reliable operation of battery systems. In recent years, data-driven methods have emerged as promising alternatives to capacity estimation due to higher estimation accuracy. Despite significant progress, data-driven methods are mainly developed by experimental data under well-controlled charge–discharge processes, which are seldom available for practical battery health monitoring under realistic conditions due to uncertainties in environmental and operational conditions. In this paper, a novel method to estimate the capacity of large-format LiFePO₄ batteries based on real data from electric vehicles is proposed. A comprehensive dataset consisting of 85 vehicles that has been running for around one year under diverse nominal conditions derived from a cloud platform is generated. A classification and aggregation capacity prediction method is developed, combining a battery aging experiment with big data analysis on cloud data. Based on degradation mechanisms, IC curve features are extracted, and a linear regression model is established to realize high-precision estimation for slow-charging data with constant-current charging. The selected features are highly correlated with capacity (Pearson correlation coefficient < 0.85 for all vehicles), and the MSE of the capacity estimation results is less than 1 Ah. On the basis of protocol analysis and mechanism studies, a feature set including internal resistance, temperature, and statistical characteristics of the voltage curve is constructed, and a neural network (NN) model is established for multi-stage variable-current fast-charging data. Finally, the above two models are integrated to achieve capacity prediction under complex and changeable realistic working conditions, and the relative error of the capacity estimation method is less than 0.8%. An aging experiment using the battery, which is the same as those equipped in the vehicles in the dataset, is carried out to verify the methods. To the best of the authors’ knowledge, our study is the first to verify a capacity estimation model derived from field data using an aging experiment of the same type of battery. Full article

(This article belongs to the Special Issue Battery Energy Storage in Advanced Power Systems)

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20 pages, 4977 KiB

Open AccessArticle

Lithium-Ion Battery State-of-Charge Estimation Using Electrochemical Model with Sensitive Parameters Adjustment

by Jingrong Wang, Jinhao Meng, Qiao Peng, Tianqi Liu, Xueyang Zeng, Gang Chen and Yan Li

Batteries 2023, 9(3), 180; https://doi.org/10.3390/batteries9030180 - 20 Mar 2023

Cited by 14 | Viewed by 4260

Abstract

State-of-charge (SOC) estimation of lithium-ion (Li-ion) batteries with good accuracy is of critical importance for battery management systems. For the model-based methods, the electrochemical model has been widely used due to its accuracy and ability to describe the internal behaviors of the battery. [...] Read more.

State-of-charge (SOC) estimation of lithium-ion (Li-ion) batteries with good accuracy is of critical importance for battery management systems. For the model-based methods, the electrochemical model has been widely used due to its accuracy and ability to describe the internal behaviors of the battery. However, the uncertainty of parameters and the lack of correction from voltage also induce errors during long-time calculation. This paper proposes a particle filter (PF) based method to estimate Li-ion batteries’ SOC using electrochemical model, with sensitive parameter identification achieved using the particle swarm optimization (PSO) algorithm. First, a single particle model with electrolyte dynamics (SPME) is used in this work to reduce the computational burden of the battery electrochemical model, whose sensitive parameters are selected through the elementary effect test. Then, the representative sensitive parameters, which are difficult to measure directly, are adjusted by PSO for a high efficiency. Finally, a model-based SOC estimation framework is constructed with PF to achieve accurate Li-ion battery SOC. Compared with extended Kalman filter and equivalent circuit model, the proposed method shows high accuracy under three different driving cycles. Full article

(This article belongs to the Special Issue Advanced Lithium-Ion Battery Management in Renewable Energy Systems)

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13 pages, 2485 KiB

Open AccessArticle

Dehydrogenation of Alkali Metal Aluminum Hydrides MAlH₄ (M = Li, Na, K, and Cs): Insight from First-Principles Calculations

by Rui Zhou, Xiaohua Mo, Yong Huang, Chunyan Hu, Xiaoli Zuo, Yu Ma, Qi Wei and Weiqing Jiang

Batteries 2023, 9(3), 179; https://doi.org/10.3390/batteries9030179 - 19 Mar 2023

Cited by 5 | Viewed by 1854

Abstract

Complex aluminum hydrides with high hydrogen capacity are among the most promising solid-state hydrogen storage materials. The present study determines the thermal stability, hydrogen dissociation energy, and electronic structures of alkali metal aluminum hydrides, MAlH₄ (M = Li, Na, K, and Cs), [...] Read more.

Complex aluminum hydrides with high hydrogen capacity are among the most promising solid-state hydrogen storage materials. The present study determines the thermal stability, hydrogen dissociation energy, and electronic structures of alkali metal aluminum hydrides, MAlH₄ (M = Li, Na, K, and Cs), using first-principles density functional theory calculations in an attempt to gain insight into the dehydrogenation mechanism of these hydrides. The results show that the hydrogen dissociation energy (E_d-H₂) of MAlH₄ (M = Li, Na, K, and Cs) correlates with the Pauling electronegativity of cation M (χ_P); that is, the E_d-H₂ (average value) decreases, i.e., 1.211 eV (LiAlH₄) < 1.281 eV (NaAlH₄) < 1.291 eV (KAlH₄) < 1.361 eV (CsAlH₄), with the increasing χ_P value, i.e., 0.98 (Li) > 0.93 (Na) > 0.82 (K) > 0.79 (Cs). The main reason for this finding is that alkali alanate MAlH₄ at higher cation electronegativity is thermally less stable and held by weaker Al-H covalent and H-H ionic interactions. Our work contributes to the design of alkali metal aluminum hydrides with a favorable dehydrogenation, which is useful for on-board hydrogen storage. Full article

(This article belongs to the Special Issue Advances in Carbon-Based Materials for Energy Storage)

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11 pages, 18562 KiB

Open AccessArticle

Textile PAN Carbon Fibers Cathode for High-Voltage Seawater Batteries

by João Ferreira, Tiago Salgueiro, Jossano Marcuzzo, Eduardo Arruda, João Ventura and Joana Oliveira

Batteries 2023, 9(3), 178; https://doi.org/10.3390/batteries9030178 - 18 Mar 2023

Cited by 2 | Viewed by 2661

Abstract

Rechargeable sodium seawater batteries (SWBs) are gaining the world leadership of high voltage energy storage devices for marine environments. With natural seawater as the source of active material, SWBs can be supplied infinitely with Na cations. Because of their open-structured cathode, the cathode [...] Read more.

Rechargeable sodium seawater batteries (SWBs) are gaining the world leadership of high voltage energy storage devices for marine environments. With natural seawater as the source of active material, SWBs can be supplied infinitely with Na cations. Because of their open-structured cathode, the cathode material’s specific surface area, porosity and wettability need to be optimized to achieve a high-performance cell. In this work, activated textile polyacrylonitrile (PAN) fibers were used to produce an activated carbon felt with a facile manufacturing process. The easy and low-cost production of these fibers makes them excellent candidates for energy storage applications involving oxygen evolution and reduction reactions. The electrochemical performance results of the fabricated activated PAN fibers and of commercial carbon felts were measured and compared, being characterized through galvanostic charge discharge cycles, electrochemical impedance spectroscopy and cyclic voltammetries. A performance improvement was observed with PAN activated carbon felt as half cell with a capacitance increase (about 9000%), and as full cell with a smaller voltage gap (about 10%) and increased gravimetric capacitance (about 260%) when compared to the commercial carbon felt. The successful implementation of PAN activated carbon felts in an aqueous environment opens new paths toward high performance seawater battery’s cathodes. Full article

(This article belongs to the Special Issue Anode and Cathode Materials for Lithium-Ion and Sodium-Ion Batteries)

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18 pages, 3500 KiB

Open AccessArticle

Accurate Prediction Approach of SOH for Lithium-Ion Batteries Based on LSTM Method

by Lijun Zhang, Tuo Ji, Shihao Yu and Guanchen Liu

Batteries 2023, 9(3), 177; https://doi.org/10.3390/batteries9030177 - 18 Mar 2023

Cited by 29 | Viewed by 7486

Abstract

The deterioration of the health state of lithium-ion batteries will lead to the degradation of the battery performance, the reduction of the maximum available capacity, the continuous shortening of the service life, the reduction of the driving range of electric vehicles, and even [...] Read more.

The deterioration of the health state of lithium-ion batteries will lead to the degradation of the battery performance, the reduction of the maximum available capacity, the continuous shortening of the service life, the reduction of the driving range of electric vehicles, and even the occurrence of safety accidents in electric vehicles driving. To solve the problem that the traditional battery management system is difficult to accurately manage and predict its health condition, this paper proposes the mechanism and influencing factors of battery degradation. The battery capacity is selected as the characterization of the state of health (SOH), and the long short-term memory (LSTM) model of battery capacity is constructed. The intrinsic pattern of capacity degradation is detected and extracted from the perspective of time series. Experimental results from NASA and CALCE battery life datasets show that the prediction approach based on the LSTM model can accurately predict the available capacity and the remaining useful life (RUL) of the lithium-ion battery. Full article

(This article belongs to the Special Issue Battery Safety: Recent Advances and Perspective)

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13 pages, 4823 KiB

Open AccessArticle

Comparing the Cold-Cranking Performance of Lead-Acid and Lithium Iron Phosphate Batteries at Temperatures below 0 °C

by Sophia Bauknecht, Florian Wätzold, Anton Schlösser and Julia Kowal

Batteries 2023, 9(3), 176; https://doi.org/10.3390/batteries9030176 - 17 Mar 2023

Cited by 3 | Viewed by 3044

Abstract

Six test cells, two lead–acid batteries (LABs), and four lithium iron phosphate (LFP) batteries have been tested regarding their capacity at various temperatures (25 °C, 0 °C, and −18 °C) and regarding their cold crank capability at low temperatures (0 °C, −10 °C, [...] Read more.

Six test cells, two lead–acid batteries (LABs), and four lithium iron phosphate (LFP) batteries have been tested regarding their capacity at various temperatures (25 °C, 0 °C, and −18 °C) and regarding their cold crank capability at low temperatures (0 °C, −10 °C, −18 °C, and −30 °C). During the capacity test, the LFP batteries have a higher voltage level at all temperatures than LABs, which results in a higher power and energy output. Moreover, LFP batteries have a lower capacity decline and a lower energy decline for decreasing temperature. Regarding the cold-cranking test definition, the LABs passed the test at 0 °C, −10 °C, and −18 °C, but not at −30 °C. The LFP batteries passed the test at 0 °C and −10 °C. At −18 °C, only two of the four LFP batteries passed, while all LFP batteries failed the test at −30 °C. For comparability between technologies, it is suggested to redefine the requirements of the standard test in terms of power or energy. With this redefinition, the LFP battery can generate comparable cold-cranking results till −18 °C. Full article

(This article belongs to the Section Battery Performance, Ageing, Reliability and Safety)

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14 pages, 4534 KiB

Open AccessArticle

Density Functional Theory Study of Oxygen Evolution Reaction Mechanism on Rare Earth Sc-Doped Graphene

by Yiwen Liu, Mengqi Liao, Yuting Hu, Tae-Gwan Lee, Ravindranadh Koutavarapu, Shaik Gouse Peera and Chao Liu

Batteries 2023, 9(3), 175; https://doi.org/10.3390/batteries9030175 - 17 Mar 2023

Cited by 3 | Viewed by 2495

Abstract

The development of a stable catalyst with excellent catalytic performance for the oxygen evolution reaction (OER) in alkaline environments is a key reaction in various electrochemical technologies. In this work, single-atom catalysts (SACs) systems in which scandium (Sc), a rare earth metal, with [...] Read more.

The development of a stable catalyst with excellent catalytic performance for the oxygen evolution reaction (OER) in alkaline environments is a key reaction in various electrochemical technologies. In this work, single-atom catalysts (SACs) systems in which scandium (Sc), a rare earth metal, with different N/C coordination environments (ScN_xC_3−x@SACs and ScN_xC_4−x@SACs of Sc) were systematically studied with the help of density functional theory (DFT) calculations. The results of the structural thermodynamic stability analysis indicated that the ScN_xC_3−x@SACs and ScN_xC_4−x@SACs systems are more stable with increasing N atom doping concentration around Sc. The ScN₃, ScN₃C, and ScN₄ with better stability were selected as the objects of subsequent research. However, ScN₃ and ScN₄ form Sc(OH)₂N₃ and Sc(OH)₂N₄ structures with double-hydroxyl groups as ligands because of the strong adsorption of OH species, whereas the strong adsorption of OH species by ScN₃C causes structural instability. Here, the overpotential (η) of Sc(OH)₂N₃ was 1.03 V; Sc(OH)₂N₄ had two reaction paths and the η of path 1 was 0.80 V, which was 0.30 V lower than that of path 2. Therefore, Sc(OH)₂N₄ can be used as a stable and promising OER catalyst with easy desorption of O₂ and good cycle performance. The hydroxyl ligand modification of Sc-N_xC_3−x@SACs and Sc-N_xC_4−x@SACs provides a method for studying the catalytic performance of other rare earth elements. Full article

(This article belongs to the Special Issue Research Focuses on Zinc-Air Batteries)

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36 pages, 8774 KiB

Open AccessReview

MXene-Based Materials for Multivalent Metal-Ion Batteries

by Chunlei Wang, Zibing Pan, Huaqi Chen, Xiangjun Pu and Zhongxue Chen

Batteries 2023, 9(3), 174; https://doi.org/10.3390/batteries9030174 - 17 Mar 2023

Cited by 18 | Viewed by 4868

Abstract

Multivalent metal ion (Mg²⁺, Zn²⁺, Ca²⁺, and Al³⁺) batteries (MMIBs) emerged as promising technologies for large-scale energy storage systems in recent years due to the abundant metal reserves in the Earth’s crust and potentially low [...] Read more.

Multivalent metal ion (Mg²⁺, Zn²⁺, Ca²⁺, and Al³⁺) batteries (MMIBs) emerged as promising technologies for large-scale energy storage systems in recent years due to the abundant metal reserves in the Earth’s crust and potentially low cost. However, the lack of high-performance electrode materials is still the main obstacle to the development of MMIBs. As a newly large family of two-dimensional transition metal carbides, nitrides, and carbonitrides, MXenes have attracted growing focus in the energy storage field because of their large specific surface area, excellent conductivity, tunable interlayer spaces, and compositional diversity. In particular, the multifunctional chemistry and superior hydrophilicity enable MXenes to serve not only as electrode materials but also as important functional components for heterojunction composite electrodes. Herein, the advances of MXene-based materials since its discovery for MMIBs are summarized, with an emphasis on the rational design and controllable synthesis of MXenes. More importantly, the fundamental understanding of the relationship between the morphology, structure, and function of MXenes is highlighted. Finally, the existing challenges and future research directions on MXene-based materials toward MMIBs application are critically discussed and prospected. Full article

(This article belongs to the Special Issue Rechargeable Multivalent Metal-Ion Batteries)

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14 pages, 6573 KiB

Open AccessArticle

The Effects of Silicon Anode Thickness on the Electrochemical Performance of Li-Ion Batteries

by Matea Raić, Krešimir Kvastek, Lara Mikac, Nikola Baran and Mile Ivanda

Batteries 2023, 9(3), 173; https://doi.org/10.3390/batteries9030173 - 17 Mar 2023

Cited by 2 | Viewed by 3865

Abstract

The electrode configuration is an important element in the development of Li-ion cells. The energy density is proportional to the loading of the active material. Therefore, increasing the electrode thickness is the simplest way to achieve higher capacities. In this paper, we compare [...] Read more.

The electrode configuration is an important element in the development of Li-ion cells. The energy density is proportional to the loading of the active material. Therefore, increasing the electrode thickness is the simplest way to achieve higher capacities. In this paper, we compare the effects of three different thicknesses of Ag-decorated Si electrode anode (HCSi) on the electrochemical performances such as the SEI layer formation, impedances, and mass capacitances. We prepared three different silicon electrode thicknesses to optimize the electrodes: 20, 40 and 60 µm and measured in situ galvanostatic electrochemical impedance spectroscopy (GEIS). Using GEIS, we studied the intercalation mechanism of Li⁺ ions in detail and found that despite having the same capacities (≈3500 mAh g⁻¹), the thinnest electrode, HCSi20, allows diffusion of Li⁺ ions into the bulk, whereas thicker layers prevent smooth diffusion into the bulk of the silicon electrode due to increased layer resistance. The Voigt model was used to analyze the anomaly of the frequency dependence of the measured impedance, in which, the classical Randles circuit is connected in series with one or two R ‖ C parallel combinations. One R ‖ C circuit could be the result of the SEI formation, and the second R ‖ C circuit could be the contribution of Li. To increase the number of charge and discharge cycles, we improved the electrolyte by adding fluoroethylene carbonate (FEC), which reduced the capacity of the HCSi20 electrode to 50% of the initial capacity (≈3500 mAh g⁻¹) after 60 cycles, whereas it dropped to 20% of the initial capacity after 10 cycles without the addition of FEC. Full article

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16 pages, 2104 KiB

Open AccessArticle

Aging Determination of Series-Connected Lithium-Ion Cells Independent of Module Design

by Thiemo Hein, David Oeser, Andreas Ziegler, Daniel Montesinos-Miracle and Ansgar Ackva

Batteries 2023, 9(3), 172; https://doi.org/10.3390/batteries9030172 - 17 Mar 2023

Cited by 4 | Viewed by 2454

Abstract

In this work, a battery consisting of eight commercial NMC/graphite cells connected in series was cycled to 60% of its initial capacity. During the test, special care was taken to ensure that the results were not influenced by either the module assembly or [...] Read more.

In this work, a battery consisting of eight commercial NMC/graphite cells connected in series was cycled to 60% of its initial capacity. During the test, special care was taken to ensure that the results were not influenced by either the module assembly or the module design. For this purpose, the cells were virtually connected in a laboratory environment with the help of the test device as if they were operated together in a battery. Extrinsic influences that affect cell aging were thus reduced to a minimum. Differential Voltage Analysis (DVA), Electrochemical Impedance Spectrum (EIS), and relaxation measurements were performed to analyze the aging behavior of each cell. The results show that despite a theoretically perfect module design, Cell-to-Cell Variations (CtCV) occurred during aging. The shifting Depth of Discharge (DoD) values among the cells further amplify CtCV. Lithium plating was also observed in the faster aging cells after cyclic aging, suggesting that this aging effect contributes significantly to the development of CtCV. After the aging test, the battery was equipped with an active balancing system that maximizes capacity utilization. More important, the balancing charges which are calculated iteratively within the used balancing algorithm show a strong correlation to the pure capacity losses and thus provide a new way to determine the capacity values of each cell individually without disassembling the battery. Full article

(This article belongs to the Section Battery Performance, Ageing, Reliability and Safety)

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18 pages, 24402 KiB

Open AccessArticle

Implementing Binder Gradients in Thick Water-Based NMC811 Cathodes via Multi-Layer Coating

by Lukas Neidhart, Katja Fröhlich, Franz Winter and Marcus Jahn

Batteries 2023, 9(3), 171; https://doi.org/10.3390/batteries9030171 - 16 Mar 2023

Cited by 4 | Viewed by 2842

Abstract

Multi-layer coating of electrodes with different material compositions helps unlock the full potential of high-loaded electrodes. Within this work, LiNi_0.8Mn_0.1Co_0.1O₂ (NMC811) cathodes with an areal capacity of >8.5 mA h cm⁻² and tuned binder concentrations [...] Read more.

Multi-layer coating of electrodes with different material compositions helps unlock the full potential of high-loaded electrodes. Within this work, LiNi_0.8Mn_0.1Co_0.1O₂ (NMC811) cathodes with an areal capacity of >8.5 mA h cm⁻² and tuned binder concentrations were fabricated by using an industrially relevant roll-to-roll process. Rate capability tests revealed an increase in practical specific discharge capacity independent from the C-rate for cathodes with reduced binder concentration in the top layer. At high current densities (C-rate of 1C) an improved performance of up to 27% was achieved. Additionally, at lower C-rates, binder gradients perpendicular to the current collector have beneficial effects on thick electrodes. However, surface analysis and electrochemical impedance spectroscopy revealed that without an adequate connection between the active material particles through a carbon-binder domain, charge transfer resistance limits cycling performance at high current densities. Full article

(This article belongs to the Special Issue Emerging Technologies and Electrode Materials for Metal Batteries)

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18 pages, 3691 KiB

Open AccessArticle

Influence of the Thermal Treatment on the Structure and Cycle Life of Copper Hexacyanoferrate for Aqueous Zinc-Ion Batteries

by Mohsen Baghodrat, Giorgia Zampardi, Jens Glenneberg and Fabio La Mantia

Batteries 2023, 9(3), 170; https://doi.org/10.3390/batteries9030170 - 15 Mar 2023

Cited by 3 | Viewed by 2117

Abstract

Copper hexacyanoferrate (CuHCF) has become an attractive Zn²⁺ insertion material as a positive electrode in aqueous zinc-ion batteries thanks to its high reversibility towards Zn²⁺ (de-)insertion, its simple, inexpensive and easily scalable synthesis route, its low toxicity, and its high working [...] Read more.

Copper hexacyanoferrate (CuHCF) has become an attractive Zn²⁺ insertion material as a positive electrode in aqueous zinc-ion batteries thanks to its high reversibility towards Zn²⁺ (de-)insertion, its simple, inexpensive and easily scalable synthesis route, its low toxicity, and its high working potential. It is known that the physiochemical properties of CuHCF can be modified by manipulating its synthesis parameters. However, the effect of these parameters on the material’s electrochemical performance and cycle life needs further investigation. Here, the structure and composition of CuHCF treated at different temperatures are studied through crystallographic, compositional, and thermogravimetric analyses. The resulting CuHCF powders were galvanostatically cycled to assess their electrochemical performance in relation to their annealing temperature. The results showed that the annealed CuHCF electrodes exhibited longer cycle life while maintaining a coulombic efficiency ≥ 99.5%. The longest cycle life was achieved by annealing the CuHCF electrodes at 100 °C. Full article

(This article belongs to the Section Battery Materials and Interfaces: Anode, Cathode, Separators and Electrolytes or Others)

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30 pages, 5730 KiB

Open AccessArticle

End-to-End Direct-Current-Based Extreme Fast Electric Vehicle Charging Infrastructure Using Lithium-Ion Battery Storage

by Vishwas Powar and Rajendra Singh

Batteries 2023, 9(3), 169; https://doi.org/10.3390/batteries9030169 - 14 Mar 2023

Cited by 9 | Viewed by 5367

Abstract

An urgent need to decarbonize the surface transport sector has led to a surge in the electrification of passenger and heavy-duty fleet vehicles. The lack of widespread public charging infrastructure hinders this electric vehicle (EV) transition. Extreme fast charging along interstates and highway [...] Read more.

An urgent need to decarbonize the surface transport sector has led to a surge in the electrification of passenger and heavy-duty fleet vehicles. The lack of widespread public charging infrastructure hinders this electric vehicle (EV) transition. Extreme fast charging along interstates and highway corridors is a potential solution. However, the legacy power grid based on alternating current (AC) beckons for costly upgrades that will be necessary to sustain sporadic fast charging loads. The primary goal of this paper is to propose a sustainable, low-loss, extremely fast charging infrastructure based on photovoltaics (PV) and co-located lithium-ion battery storage (BESS). Lithium-ion BESS plays a pivotal role in our proposed design by mitigating demand charges and operating as an independent 16–18 h power source. An end-to-end direct current power network with high voltage direct current interconnection is also incorporated. The design methodology focuses on comprehensive hourly EV-load models generated for different types of passenger vehicles and heavy-duty fleet charging. Appropriate PV-BESS sizing, optimum tilt, and temperature compensation techniques based on 15 years of irradiation data were utilized in the design. The proposed grid-independent DC power networks can significantly improve well-to-wheels efficiency by minimizing total system losses for fast charging networks. The network power savings for low, medium, and high voltage use cases were evaluated. Our results demonstrate 17% to 25% power savings compared to the traditional AC case. Full article

(This article belongs to the Collection Recent Advances in Battery Management Systems)

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19 pages, 5376 KiB

Open AccessArticle

The Role of the Precursor on the Electrochemical Performance of N,S Co-Doped Graphene Electrodes in Aqueous Electrolytes

by Rodrigo Braga, Diana M. Fernandes, Alberto Adán-Más, Teresa M. Silva and M. F. Montemor

Batteries 2023, 9(3), 168; https://doi.org/10.3390/batteries9030168 - 13 Mar 2023

Cited by 4 | Viewed by 2070

Abstract

The introduction of pillared agents or dopants to the graphene used as the electroactive material in supercapacitor electrodes can be an efficient way to facilitate ion transfer, mitigate re-stacking, and improve electrochemical performance. We evaluated the effect of different precursors containing nitrogen (N) [...] Read more.

The introduction of pillared agents or dopants to the graphene used as the electroactive material in supercapacitor electrodes can be an efficient way to facilitate ion transfer, mitigate re-stacking, and improve electrochemical performance. We evaluated the effect of different precursors containing nitrogen (N) and sulfur (S) atoms to dope graphene flake (GF) lattices. The electrochemical performance of the doped GF was assessed in 1 M KOH and 1 M Na₂SO₄ electrolytes. N- and S-doped GF flakes were synthesized via mechanochemical synthesis, also known as ball milling. After being ground, the materials were calcined under N₂. The physicochemical characterization of the materials evidenced the co-doping of both S and N into the graphene backbone, as corroborated by the results of Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). As shown by the results, the nature of the precursors influences the ratio of S and N in the doped graphene flakes and, consequently, the response of the electroactive electrode material. The co-doping obtained using 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole revealed a specific capacitance of 48 F.g⁻¹ at 1.0 A∙g⁻¹ and over 90% capacitance retention after 10,000 cycles at 10.0 A∙g⁻¹ in Na₂SO₄. Full article

(This article belongs to the Special Issue Feature Papers to Celebrate the First Impact Factor of Batteries)

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11 pages, 5336 KiB

Open AccessArticle

Solid Electrolytes in the N-Propyl-N-methyl-pyrrolidinium Tetrafluoroborate—Lithium Tetrafluoroborate System

by Artem Ulihin, Dmitry Novozhilov and Nikolai Uvarov

Batteries 2023, 9(3), 167; https://doi.org/10.3390/batteries9030167 - 10 Mar 2023

Cited by 4 | Viewed by 1758

Abstract

Solid electrolytes prepared by the addition of LiBF₄ to the plastic phase of [N₁₃pyr]BF₄ were prepared, and their physical and electrical properties were investigated. The electrolytes [N₁₃pyr]BF₄-LiBF₄ containing 8–20 wt% LiBF₄ are solid [...] Read more.

Solid electrolytes prepared by the addition of LiBF₄ to the plastic phase of [N₁₃pyr]BF₄ were prepared, and their physical and electrical properties were investigated. The electrolytes [N₁₃pyr]BF₄-LiBF₄ containing 8–20 wt% LiBF₄ are solid at temperatures below 80 °C and have a high ionic conductivity ~10⁻³–10⁻² S cm⁻¹ at 60 °C. Based on the results of DSC and conductivity studies, the phase diagram of the [N₁₃pyr]BF₄-LiBF₄ binary system was plotted, and the formation of a new compound, 3[N₁₃pyr]BF₄·2LiBF₄ was proposed. The existence of the new phase was supported by X-ray diffraction data. Electrochemical measurements of cells with lithium electrodes were carried out to test the applicability of these materials in lithium batteries. The electrochemical window was determined to be more than 5 V. In contrast to earlier data obtained for similar systems, the preconditioning effect was not observed. Nevertheless, the solid electrolyte [N₁₃pyr]BF₄-LiBF₄ system has high ionic conductivity and may be used in solid-state lithium-ion batteries. Full article

(This article belongs to the Special Issue Solid-State Electrolytes for Safe Batteries)

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14 pages, 3749 KiB

Open AccessArticle

Ion Transport Regulated Lithium Metal Batteries Achieved by Electrospun ZIF/PAN Composite Separator with Suitable Electrolyte Wettability

by Ting Liu, Xuemei Hu, Yadong Zhang, Ting He, Jianping Zhou and Junqiang Qiao

Batteries 2023, 9(3), 166; https://doi.org/10.3390/batteries9030166 - 9 Mar 2023

Cited by 7 | Viewed by 3151

Abstract

Lithium metal battery (LMB) is a topic receiving growing attention due to the high theoretical capacity, while its practical application is seriously hindered by the lithium dendrites issue. As the physical barrier between two electrodes, the separator can achieve dendrite suppression by means [...] Read more.

Lithium metal battery (LMB) is a topic receiving growing attention due to the high theoretical capacity, while its practical application is seriously hindered by the lithium dendrites issue. As the physical barrier between two electrodes, the separator can achieve dendrite suppression by means of providing higher mechanical strength, regulating ion transport and facilitating homogeneous lithium deposition. Based on this, a composite separator is fabricated with zeolitic imidazolate framework (ZIF-8) and polyacrylonitrile (PAN) via electrospinning techniques, and its physical properties and electrochemical performances, together with its dendrite suppression mechanism, are investigated. The ZIF8-PAN separator possesses a unique 3D interconnected porous skeleton, displaying higher electrolyte uptake, preferable electrolyte wettability, and lower thermal shrinkage compared with the commercial polypropylene separator. In addition, a battery assembled with the ZIF8-PAN separator can effectively regulate ion transport and suppress dendrites growth, which exhibits an enhanced ionic conductivity (1.176 mS/cm), an increased lithium-ion transference number (0.306), a wider electrochemical stability window (5.04 V), and superior cycling stability (over 600 h with voltage hysteresis of 30 mV). This work offers a promising strategy to realize safe separator for dendrite suppression in LMB. Full article

(This article belongs to the Special Issue Advanced Electrolytes for Metal Ion Batteries)

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15 pages, 5507 KiB

Open AccessArticle

Prediction of the Heat Generation Rate of Lithium-Ion Batteries Based on Three Machine Learning Algorithms

by Renfeng Cao, Xingjuan Zhang and Han Yang

Batteries 2023, 9(3), 165; https://doi.org/10.3390/batteries9030165 - 9 Mar 2023

Cited by 8 | Viewed by 3276

Abstract

The heat generation rate (HGR) of lithium-ion batteries is crucial for the design of a battery thermal management system. Machine learning algorithms can effectively solve nonlinear problems and have been implemented in the state estimation and life prediction of batteries; however, limited research [...] Read more.

The heat generation rate (HGR) of lithium-ion batteries is crucial for the design of a battery thermal management system. Machine learning algorithms can effectively solve nonlinear problems and have been implemented in the state estimation and life prediction of batteries; however, limited research has been conducted on determining the battery HGR through machine learning. In this study, we employ three common machine learning algorithms, i.e., artificial neural network (ANN), support vector machine (SVM), and Gaussian process regression (GPR), to predict the battery HGR based on our experimental data, along with cases of interpolation and extrapolation. The results indicated the following: (1) the prediction accuracies for the interpolation cases were better than those of extrapolation, and the R² values of interpolation were greater than 0.96; (2) after the discharge voltage was added as an input parameter, the prediction of the ANN was barely affected, whereas the performance of the SVM and GPR were improved; and (3) the ANN exhibited the best performance among the three algorithms. Accurate results can be obtained by using a single hidden layer and no more than 15 neurons without the additional input, where the R² values were in the range of 0.89–1.00. Therefore, the ANN is preferable for predicting the HGR of lithium-ion batteries. Full article

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22 pages, 47786 KiB

Open AccessFeature PaperReview

A Systematic Literature Analysis on Electrolyte Filling and Wetting in Lithium-Ion Battery Production

by Nicolaj Kaden, Ricarda Schlimbach, Álvaro Rohde García and Klaus Dröder

Batteries 2023, 9(3), 164; https://doi.org/10.3390/batteries9030164 - 9 Mar 2023

Cited by 10 | Viewed by 6167

Abstract

Electrolyte filling and wetting is a quality-critical and cost-intensive process step of battery cell production. Due to the importance of this process, a steadily increasing number of publications is emerging for its different influences and factors. We conducted a systematic literature review to [...] Read more.

Electrolyte filling and wetting is a quality-critical and cost-intensive process step of battery cell production. Due to the importance of this process, a steadily increasing number of publications is emerging for its different influences and factors. We conducted a systematic literature review to identify common parameters that influence wetting behavior in experimental settings, specifically focusing on material, processes, and experimental measurement methods but excluding simulation studies. We reduced the initially found 544 records systematically to 39 fully labeled articles. Our profound analysis guided by attributed labelings revealed current research gaps such as the lack of a holistic view on measurement methods for filling and wetting, underrepresented studies relevant to series production, as well as the negligence of research targeting the transferability of results from the material to the cell level, while also examining the measured variables’ interactions. After comparatively illustrating and discussing implications of our findings, we also discussed limitations of our contribution and suggested ideas for potential further research topics. Full article

(This article belongs to the Section Battery Processing, Manufacturing and Recycling)

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13 pages, 4531 KiB

Open AccessArticle

SOC Estimation Based on Combination of Electrochemical and External Characteristics for Hybrid Lithium-Ion Capacitors

by Xiaofan Huang, Renjie Gao, Luyao Zhang, Xinrong Lv, Shaolong Shu, Xiaoping Tang, Ziyao Wang and Junsheng Zheng

Batteries 2023, 9(3), 163; https://doi.org/10.3390/batteries9030163 - 9 Mar 2023

Cited by 1 | Viewed by 1826

Abstract

Hybrid lithium-ion capacitors (HyLICs) have received considerable attention because of their ability to combine the advantages of high-energy lithium-ion batteries and high-power supercapacitors. State of charge (SOC) is the main factor affecting the practical application of HyLICs; therefore, it is essential to estimate [...] Read more.

Hybrid lithium-ion capacitors (HyLICs) have received considerable attention because of their ability to combine the advantages of high-energy lithium-ion batteries and high-power supercapacitors. State of charge (SOC) is the main factor affecting the practical application of HyLICs; therefore, it is essential to estimate the SOC accurately. In this paper, a partition SOC-estimation method that combines electrochemical and external characteristics is proposed. The discharge process of the HyLICs was divided into three phases based on test results of electrochemical characteristics. To improve the estimation accuracy and reduce the amount of calculation, the Extended Kalman Filter (EKF) method was applied for SOC estimation at the interval where the capacitor energy storage characteristics dominated, and the Ampere-hour (Ah) method was used to estimate the SOC at the interval where battery energy storage characteristics dominated. The proposed method is verified under different operating conditions. The experimental results show good agreement with the estimation results, which indicates that the proposed method can estimate the SOC of the HyLICs accurately. Full article

(This article belongs to the Special Issue Lithium-Ion Batteries and Li-Ion Capacitors: From Fundamentals to Practical Applications)

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16 pages, 5099 KiB

Open AccessArticle

Symmetric and Asymmetric Supercapacitors of ITO Glass and Film Electrodes Consisting of Carbon Dot and Magnetite

by Misganu Chewaka Fite, Po-Jen Wang and Toyoko Imae

Batteries 2023, 9(3), 162; https://doi.org/10.3390/batteries9030162 - 8 Mar 2023

Cited by 3 | Viewed by 1956

Abstract

To enhance the energy density, hybrid supercapacitors were fabricated, and their electrochemical features were investigated using a two-electrode configuration. By assembling nitrogen-doped graphene/magnetite (NG/Fe₃O₄) on indium tin oxide-coated (ITO) glass as a cathode and NG/carbon dots(Cdots)/Fe₃O₄ [...] Read more.

To enhance the energy density, hybrid supercapacitors were fabricated, and their electrochemical features were investigated using a two-electrode configuration. By assembling nitrogen-doped graphene/magnetite (NG/Fe₃O₄) on indium tin oxide-coated (ITO) glass as a cathode and NG/carbon dots(Cdots)/Fe₃O₄ on ITO glass as an anode, a much higher gravimetric specific capacitance of 252.2 F/g, at a current density of 0.5 A/g, was obtained from this asymmetric supercapacitor compared with that (212.0 F/g) of a symmetric supercapacitor (NG/Cdots/Fe₃O₄)//(NG/Cdots/Fe₃O₄). A gravimetric energy density of 90.1 Wh/kg was obtained for an asymmetric ITO glass device at a specific power density of 400.0 W/kg. On the other hand, when an asymmetric two-electrode cell was fabricated with a Cdots/polypyrrole (PPy)/Fe₃O₄/TEMPO-oxidized cellulose nanofiber (TOCNF)-film electrode and a Cdots/PPy/TOCNF-film electrode, the specific capacitance (107.1 F/g) at a current density of 0.8 A/g was lower than that (456.4 F/g) of a symmetric (Cdots/PPy/Fe₃O₄/TOCNF)//(Cdots/PPy/Fe₃O₄/TOCNF)-film cell. Subsequently, a gravimetric energy density of 40.6 Wh/kg was achieved for a symmetric-film device at a specific power density of 320 W/kg. These results suggest that our method offers an efficient approach to developing symmetric and asymmetric devices consisting of hybrid materials for meeting the ever-increasing demands on energy-storage devices. Full article

(This article belongs to the Special Issue High-Performance and Sustainable Supercapacitors: Current Status and Perspective)

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