碳硅复合电极材料在锂离子电池中的应用研究  

Study on application of carbon and silicon composite electrode materials in lithium-ion batteries

作　　者：杨晓武[1] 李晓叶 YANG Xiao-wu;LI Xiao-ye(College of Chemistry and Chemical Engineering, Shanxi University of Science Technology, Xi'an Shanxi 710021, China)

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021

出　　处：《电源技术》2017年第12期1688-1690,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51373091);陕西科技大学博士科研启动基金(BJ11-10)

摘　　要：硅基材料由于具有高电化学容量,是一种有发展前途的锂离子电池负极材料,但是它在充放电过程中体积变化大、循环寿命差、首次库仑效率低,是阻碍其商业化的主要问题。以改善硅基材料的首次充放电效率、循环寿命及倍率性能为目的,采用简单研磨法制备Si/C复合材料,并研究硅碳的比例对材料结构与性能的影响。结果表明,石墨含量为80%时,材料获得了合理的结构和较优的电化学性能,首次放电比容量为2 288.1 m Ah/g,首次充放电效率为62.49%。Silicon-based materials are promising anode materials for lithium-ion batteries(LIBs)due to their high capacity.However,the commercialization of silicon-based materials as the anode of LIBs has been hindered by the huge volume change,poor cycle life and low initial coulombic efficiency during the charge-discharge process.In order to improve the initial charge-discharge efficiency,cycle life and rate performance of the silicon anode materials,the Si/C composite materials were prepared by simple grinding method,and the influence of the ratio of carbon and silicon on structure and performance was studied.The results show that Si/C composite has the reasonable structure and better electrochemical performance when the content of graphite is80%.The first discharge specific capacity is2288.1mAh/g,and the first coulombic efficiency is62.49%.

关 键 词：锂离子电池 负极材料 硅碳复合材料 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]