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Volume 26
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10.3390/molecules26154531
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Article

Carbon-Coated SiO2 Composites as Promising Anode Material for Li-Ion Batteries

by
Mihaela-Ramona Buga
1,*,
Adnana Alina Spinu-Zaulet
1,
Cosmin Giorgian Ungureanu
1,2,
Raul-Augustin Mitran
3,
Eugeniu Vasile
4,
Mihaela Florea
5 and
Florentina Neatu
5
1
National Research and Development Institute for Cryogenic and Isotopic Technologies Rm. Valcea, 4 Uzinei, 240050 Ramnicu Valcea, Romania
2
Faculty of Power Engineering, Politehnica University of Bucharest, 060042 Bucharest, Romania
3
“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Indepedentei, 060021 Bucharest, Romania
4
Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 060042 Bucharest, Romania
5
National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
*
Author to whom correspondence should be addressed.
Molecules 2021, 26(15), 4531; https://doi.org/10.3390/molecules26154531
Submission received: 3 July 2021 / Revised: 17 July 2021 / Accepted: 24 July 2021 / Published: 27 July 2021
(This article belongs to the Special Issue Porous Silica Nanomaterials for Energy Storage Applications)
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Abstract

Porous silica-based materials are a promising alternative to graphite anodes for Li-ion batteries due to their high theoretical capacity, low discharge potential similar to pure silicon, superior cycling stability compared to silicon, abundance, and environmental friendliness. However, several challenges prevent the practical application of silica anodes, such as low coulombic efficiency and irreversible capacity losses during cycling. The main strategy to tackle the challenges of silica as an anode material has been developed to prepare carbon-coated SiO2 composites by carbonization in argon atmosphere. A facile and eco-friendly method of preparing carbon-coated SiO2 composites using sucrose is reported herein. The carbon-coated SiO2 composites were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetry, transmission and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, cyclic voltammetry, and charge–discharge cycling. A C/SiO2-0.085 M calendered electrode displays the best cycling stability, capacity of 714.3 mAh·g−1, and coulombic efficiency as well as the lowest charge transfer resistance over 200 cycles without electrode degradation. The electrochemical performance improvement could be attributed to the positive effect of the carbon thin layer that can effectively diminish interfacial impedance.
Keywords: lithium-ion batteries; anode; silica; carbon coating; spray-coating lithium-ion batteries; anode; silica; carbon coating; spray-coating

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MDPI and ACS Style

Buga, M.-R.; Spinu-Zaulet, A.A.; Ungureanu, C.G.; Mitran, R.-A.; Vasile, E.; Florea, M.; Neatu, F. Carbon-Coated SiO2 Composites as Promising Anode Material for Li-Ion Batteries. Molecules 2021, 26, 4531. https://doi.org/10.3390/molecules26154531

AMA Style

Buga M-R, Spinu-Zaulet AA, Ungureanu CG, Mitran R-A, Vasile E, Florea M, Neatu F. Carbon-Coated SiO2 Composites as Promising Anode Material for Li-Ion Batteries. Molecules. 2021; 26(15):4531. https://doi.org/10.3390/molecules26154531

Chicago/Turabian Style

Buga, Mihaela-Ramona, Adnana Alina Spinu-Zaulet, Cosmin Giorgian Ungureanu, Raul-Augustin Mitran, Eugeniu Vasile, Mihaela Florea, and Florentina Neatu. 2021. "Carbon-Coated SiO2 Composites as Promising Anode Material for Li-Ion Batteries" Molecules 26, no. 15: 4531. https://doi.org/10.3390/molecules26154531

APA Style

Buga, M.-R., Spinu-Zaulet, A. A., Ungureanu, C. G., Mitran, R.-A., Vasile, E., Florea, M., & Neatu, F. (2021). Carbon-Coated SiO2 Composites as Promising Anode Material for Li-Ion Batteries. Molecules, 26(15), 4531. https://doi.org/10.3390/molecules26154531

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