Effect of Carbon Matrix on Electrochemical Performance of Si/C Composites for Use in Anodes of Lithium Secondary Batteries

Bulletin of the Korean chemical society

Yongju Jung¹  Eun Hee Lee¹  Seong Hun Jeong¹  Tae Jeong Kim¹  Yong Shin Kim¹  Bo Ock Jeong¹ 

关键词: Li secondary battery;    Si/C composite;    Carbon matrix;    Silicon;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

To investigate the influence of the carbon matrix on the electrochemical performance of Si/C composites, four types of Si/C composites were prepared using graphite, petroleum coke, pitch and sucrose as carbon precursors. A ball mill was used to prepare Si/C blends from graphite and petroleum coke, whereas a dispersion technique was used to fabricate Si/C composites where Si was embedded in disordered carbon matrix derived from pitch or sucrose. The Si/pitch-based carbon composite showed superior Si utilization (96% in the first cycle) and excellent cycle retention (70% after 40 cycles), which was attributed to the effective encapsulation of Si and the buffering effect of the surrounding carbon matrix on the silicon particles.

【 授权许可】

Unknown