电解液中氯化钾杂质对石墨电极性能的影响  

Effects of KCl contaminant in electrolyte on performance of graphite electrode

作　　者：彭琴[1] 张志业[1] 李宣丽[1] 付豪[1] 王辛龙[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《电源技术》2014年第4期615-617,共3页Chinese Journal of Power Sources

基　　金：四川大学青年教师科研启动基金项目(2012SCU11024);国家高技术研究发展计划("863"计划)基金(2011AA06A106);四川大学中国成达专项研究奖学金

摘　　要：运用充放电测试、循环伏安方法研究了在l mol/L LiPF6/(EC+DMC+EMC)电解液中,不同氯化钾(KCl)杂质含量对天然石墨电极性能的影响。充放电测试及循环伏安表明,KCl质量分数大于0.1%时,会降低石墨电极的循环性能和首次放电比容量。通过SEM、FTIR对循环后的石墨电极进行表征,结果表明,KCl含量大于0.1%时不利于形成良好的SEI膜,影响了石墨电极的电化学性能。Electrochemical performance of natural graphite electrode cycled vs.Li in 1 mol/L LiPF6/（EC＋DMC＋EMC） （1 ： 1 ： 1,volume ratio） electrolyte solution, which contained different concentrations of KCI, were evaluated by charging/discharging, cyclic voltammetry. The study results show that the natural graphite electrode cycling performance and the first discharge capacity are reduced by the addition of more than 0.1% KCI to the electrolyte. Surface analyse of the graphite electrode using SEM and FTIR suggests that adding more than 0.1% KCI are not contributes to the formation of a good SEI film, influencing the electrochemical performance of graphite electrode.

关 键 词：锂离子电池 天然石墨 氯化钾 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]