N-甲基-N-丁基吡咯烷溴化物和N-甲基-N-乙基吡咯烷溴化物在锌溴液流电池中的应用

Applications of N-Methyl-N-Butyl-Pyrrolidinium Bromide and N-Methyl-N-Ethyl-Pyrrolidinium Bromide in Zn-Br Flow Batteries

在锌溴液流电池中,作为溴络合剂在电解液中使用的季铵盐对电池性能及安全性具有重要作用.本文利用循环伏安法及线性扫描伏安法研究了N-甲基-N-丁基吡咯烷溴化物和N-甲基-N-乙基吡咯烷溴化物加入到电解液后对电极反应的影响,利用交流阻抗测量了不同组成及浓度下的电解液电导率变化,测试了不同电解液对电池充放电性能的影响及溴络合能力,结果表明加入MBP的电解液具有更好的溴络合能力和电池性能.

It is extremely important for battery performance and safety in Zn-Br flow battery to use quaternary ammonium salts as complex agents for bromine.In this work,the effects of electrolyte compositions and concentrations on the electrode reactions and battery performances were studied in the absence and presences of N-methyl-N-ethyl-pyrrolidinium bromide（MEP）or N-methyl-N-butyl-pyrrolidinium bromide（MBP）.The conductivities in the electrolytes containing different constitutions and concentrations were measured by EIS method.The charge-discharge performance for the battery and the complex ability for bromine in different electrolytes were also investigated.The results showed that the electrolyte containing MBP was better than that containing MEP for the battery performance and bromine complex ability.