添加剂对钒电池V(Ⅲ)/V(Ⅳ)混合电解液的影响

Effect of additives on V(Ⅲ)/V(Ⅳ) electrolyte of vanadium redox battery

分别使用山梨醇、牛磺酸、甲烷磺酸、柠檬酸作为钒电池用V(Ⅲ)/V(Ⅳ)混合电解液的添加剂。通过电解液中总钒浓度的变化以及V(Ⅲ)和V(Ⅳ)浓度之比来考察添加剂对电解液的稳定性的影响,通过循环伏安法和交流阻抗技术来考察添加剂对电解液电化学性能的影响。结果表明,甲烷磺酸的加入提高了V(Ⅲ)/V(Ⅳ)混合电解液的稳定性,循环伏安和交流阻抗表明甲烷磺酸的加入提高了电解液的电化学性能(V 4+/V 5+氧化峰电流增加了26.2%),改善了电解液的反应活性。

Sorbitol, taurine, methanesulfonic acid, citric acid were explored as additives in V（ III ）N（IV） electrolyte of vanadium redox battery, respectively. The effects of additives on the stability of electrolyte were studied by the change of concentration of the vanadium species and the ratio of trivalent vanadium ions to tetravalent vanadium ions in electrolyte. The effects of additives on electrochemical performance were studied by cyclic voltammetry（CV） and electrochemical impedance spectroscopy （EIS）. The results indicate that the stability of V （ III ）N （IV） electrolyte is improved by adding methanesulfonic acid. CV and EIS results indicate that the electrolyte with adding methanesulfonic acid exhibits a better electrochemical performance anodic peak current is increased by 26.2%）, and the electrochemical activity of the electrolyte is improved by adding methanesulfonic acid.