丁二腈作为电解液添加剂的研究

Study on succinonitrile as additive of electrolyte solution

在1 mol/L六氟磷酸锂/[碳酸乙烯酯(EC)+碳酸二甲酯(DMC)+碳酸甲乙酯(EMC)(体积比为1∶1∶1)]的电解液中加入添加剂丁二腈(SN),用循环伏安(CV)、恒流充放电、电化学阻抗谱(EIS)等方法,研究了丁二腈对电解液的电化学窗口、电池的比容量、电池的首次充放电效率和电池的循环性能的影响。结果表明,在电解液中加入一定量的高纯度丁二腈,能提高电池的比容量、首次充放电效率和拓宽电解液的电化学稳定窗口,从而提高电解液的热稳定性,改善电解液的循环性能。

Succinonitrile （SN） was added to the electrolyte solution containing 1 mol/L LiPF6 in ethylene carbonate （EC）, dimethyl carbonate（DMC） ,and methyl ethyl carbonate（EMC） （volume ratio of 1：1：1 ）.The effects of SN on electrochemical win- dows, specific capacity, charge-discharge efficiency for the first cycle, and cycling performance of lithium ion battery were re- searched by cyclic voltammetry （CV）, charge-discharge cycle performance, and electrochemical impedance spectra （EIS）.The results indicated that the application of high purity SN improved the specific capacity,initial charge-discharge efficiency, elec- trochemical windows, thermal stability, and cycling performance of the electrolyte solution.