电解液纯化对锂离子电池负极电化学性能影响  

Influence of purifying electrolyte on electrochemical property of graphite anode of lithium-ion battery

作　　者：马光耀[1] 鞠治成[1] 庄全超[1] 

机构地区：[1]中国矿业大学材料学院,江苏徐州221008

出　　处：《电源技术》2017年第4期541-543,640,共4页Chinese Journal of Power Sources

基　　金：江苏徐州中国矿业大学团委创新项目

摘　　要：运用电化学阻抗谱(EIS)、恒流充放电和循环伏安测试,研究了1 mol/L LiPF_6/(EC+DEC+DMC)(体积比1∶1∶1)电解液中4A分子筛除水处理对石墨电极电化学性能的影响。研究表明:石墨电极在经4A分子筛处理后的电解液中能形成性能优异的固体电解质相界面(SEI)膜,降低了SEI膜的阻抗,改善了石墨电极的循环性能,得到了更优异的电化学性能。The effects of 4A zeolite on graphite electrode were studied through galvanostatic charge-discharge method, cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS） by adding 4A zeolite into 1 mol/L LiPFe/（EC＋DEC＋DMC） electrolyte. The results show that graphite electrode has superior cycling performance in the treated electrolyte. The amount of reduction decomposition of the electrolyte on the graphite electrode surface to form a stable solid electrolyte interphase （SEI） film is decreased, and the impedance is reduced, making lithium ion intercalation process easier in graphite electrode, improving the cycle performance of graphite electrodes, having more excellent electrochemical performance.

关 键 词：锂离子电池 电解液 4A分子筛 电化学阻抗谱 SEI膜 

分 类 号：TM912[电气工程—电力电子与电力传动]