锂离子蓄电池金属锡电极容量衰减机理探讨  

Discussion on capacity fade mechanism of metal tin anode for Li-ion battery

作　　者：李昌明[1] 张仁元[1] 李伟善[2] 赵灵智[1] 胡社军[2] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510090 [2]华南师范大学化学与环境学院,广东广州510631

出　　处：《电源技术》2008年第1期21-23,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(20373016);广州市科技攻关计划(2006Z3-D2031)资助

摘　　要：用电沉积直接在铜箔上沉积金属锡,恒电流充放电循环(CC)、循环伏安(CV)、扫描电镜(SEM)和傅里叶红外光谱(FT-IR)研究了制备锡作为锂离子负极的性能。CC结果表明,锡电极的初始比容量大于600mAh/g,但6次充放电循环后容量迅速下降,至60次循环后容量基本消失。CV、SEM和FT-IR结果表明,金属锡经充放电后发生龟裂,伴随着固体电解质界面(SEI)的形成,随着循环的进一步深入SEI膜不断增厚,金属锡粉化成颗粒被SEI膜所包裹而失效。Tin was electrodeposited onto a copper foil collector and its performances as anode of lithium ion battery were investigated by constant current charge-discharge cycling （CC）, cyclic voltammetry （CV）, scanning electron microscopy （SEM）, and Fourier transition infrared （FT-IR） spectrum. The results obtained from CC show that the initial capacity of the prepared tin is over 600 mAh/g, but the capacity reduces rapidly after eight cycles and almost disappears after 60 cycles. The results obtained from CV,SEM and FT-IR show that the tin that with compact structure is cracked after it is charged and discharged, accompanying with the formation of solid electrolyte interphase （SEI） on the new surface of the cracked tin. This is the cause for the capacity fade of tin.

关 键 词：锂离子蓄电池 金属锡 负极材料 容量衰减 

分 类 号：TM912.9[电气工程—电力电子与电力传动]