磷酸二氢钠作为添加剂对高浓度五价钒电解液性能的影响

Effect of Sodium Dihydrogen Phosphate as an Additive on the Performance of High-concentrationⅤ(Ⅴ)Electrolyte

针对高浓度五价钒在高温下易沉淀析出且其电化学性能仍有提升空间等问题,本文选择了磷酸二氢钠作为正极液添加剂,研究了其对高浓度五价钒电解液的热稳定性及相关电化学性能的影响。结果表明:磷酸二氢钠对高浓度五价钒液在高温下的热稳定性具有极大的提升效果(沉淀诱导时间由6 h提升至22 h),且对电极反应速度也有一定提升效果(提高了扩散系数和反应速率常数)。

Aiming at the problems that high-concentrationⅤ(Ⅴ)is easy to precipitate at high temperature and its electrochemical performance still has room for improvement.In this paper,sodium dihydrogen phosphate was selected as the catholyte additive,and its effect on the thermal stability and electrochemical properties of the high-concentrationⅤ(Ⅴ)electrolyte was studied.The results show that sodium dihydrogen phosphate could greatly improve the thermal stability of high-concentrationⅤ(Ⅴ)electrolyte at high temperature(precipitation induction time increased from 6 h to 22 h)and increase the electrode reaction speed(improve the diffusion coefficient and reaction rate constant).