电解液纯化对锂离子电池负极电化学性能影响

摘要

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 LiPF6/(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.%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 LiPF6/(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.