Abstract: 1-Butyl-3-methylimidazolium tetrafluoroborate（BMIMBF₄）was used as the additive in anode electrolyte for vanadium redox flow battery（VRB）. Its electrochemical performance and stability were investigated by cyclic voltammetry（CV），electrochemical impedance spectrum（EIS），charge-discharge measurement and examination of stabilization. The results indicated that the electrochemical activity and stability of the anode electrolyte were improved by adding BMIMBF₄. The electric capacity of unit volume and the energy efficiency were also increased.

Key words: all vanadium redox flow battery, anode electrolyte, additive, ionic liquid

摘要： 为提高全钒液流电池的能量密度和正极电解液稳定性，采用循环伏安、交流阻抗等方法，研究了1-丁基-3-甲基咪唑四氟硼酸盐（BMIMBF₄）作为正极电解液添加剂对溶液稳定性和电化学反应活性的影响，并对其机理进行了初步探讨。实验结果表明，添加BMIMBF₄后，正极电解液中五价钒离子的稳定性显著提高，电解液的电化学反应活性也有所提升。当添加量为1%时，电池的单位体积电容量比有所增加，并且能量效率有所提升。

关键词: 全钒液流电池, 正极电解液, 添加剂, 离子液体