提高钒电池电解液的稳定性

Improving the stability of electrolyte for vanadium redox cell

为获得高比能量的钒电池电解液 ,在钒硫酸溶液中分别添加 2 %甘油和 2 %硫酸钠 ,提高了溶液中钒离子的溶解度和稳定性。利用循环伏安法测量含添加剂的钒硫酸溶液 ,得出溶液中少量的甘油和硫酸钠不会对钒氧化还原反应的可逆性产生不利的影响。用含甘油的钒硫酸溶液作为电池电解液组装钒电池 ,测量了电池的充放电性能 ,表明含 2 %甘油的钒硫酸溶液单位体积的电容量较大。

The solubility and stability of vanadium ion in vanadium H 2SO 4 solution were improved by adding 2% glycerin and 2% sodium sulfate, and the solution was used as the electrolyte with high energy density for vanadium redox cell. The vanadium H 2SO 4 solution with additives was determined by cyclic voltammetry. The results show that the little ammount of glycerin and sodium sulfate in the solution has no bad effect on the reversibility of vanadium redox reaction. The cyclic performance of the vanadium redox cell with vanadium H 2SO 4 solution containing glycerin as electrolyte was also tested. The result showes that the electric capacity of unit volume of vanadium H 2SO 4 solution with 2% glycerin is high.