**In-Situ Synthesized Si@C Materials for the Lithium Ion Battery: A Mini Review**

#### **Wenmao Tu, Ziyu Bai, Zhao Deng, Haining Zhang and Haolin Tang \***

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China; tuwm@whut.edu.cn (W.T.); 18971142560@163.com (Z.B.); dengzhao@whut.edu.cn (Z.D.); Haining.zhang@whut.edu.cn (H.Z.)

**\*** Correspondence: thln@whut.edu.cn; Tel.: +86-27-8788-4448

Received: 27 January 2019; Accepted: 7 March 2019; Published: 14 March 2019

**Abstract:** As an important component, the anode determines the property and development of lithium ion batteries. The synthetic method and the structure design of the negative electrode materials play decisive roles in improving the property of the thus-assembled batteries. Si@C compound materials have been widely used based on their excellent lithium ion intercalation capacity and cyclic stability, in which the in-situ synthetic method can make full use of the structural advantages of the monomer itself, thus improving the electrochemical performance of the anode material. In this paper, the different preparation technologies and composite structures of Si@C compound materials by in-situ synthesis are introduced. The research progress of Si@C compound materials by in-situ synthesis is reviewed, and the prospect of future development of Si@C compound materials has been tentatively commented.

**Keywords:** lithium ion battery; Si@C compound material; in-situ synthesis
