锂离子电池负极满嵌锂石墨的热稳定性

Thermal stability of fully lithiated graphite anode of Li-ion battery

将锂与石墨负极各组分进行组合,模拟满嵌锂石墨内部的物质组成,研究锂离子电池中负极满嵌锂石墨的热稳定性。在25~400℃内,满嵌锂石墨存在4个放热区间。100~135℃的区间归属为固体电解质相界面(SEI)膜的分解;随着温度的升高,嵌入在石墨内部的锂相继与残余的电解液、羧甲基纤维素(CMC)及丁苯橡胶(SBR)发生热反应,分别对应于220~270℃、270~320℃和330~350℃的区间。

Thermal stability of fully lithiated graphite anode of Li-ion battery was studied by combining lithium and the components of graphite anode to simulate the composition of fully lithiated graphite.In 25-400℃,there were four regions of fully lithiated graphite.The region of 100-135℃was attributed to the solid electrolyte interface(SEI)film decomposition.With the temperature increasing,the thermal reactions among lithium,residual electrolyte,carboxymethyl cellulose(CMC)and styrene butadiene rubber(SBR)were occurred successively,corresponding to the regions of 220-270℃,270-320℃and 330-350℃.