钼酸钠对钒电池负极电解液的影响

Effects of Na2MoO4 on the Properties of Negative Electrolyte of Vanadium Battery

研究了钼酸钠作为负极电解液的添加剂,对电解液的电化学性能、稳定性和电池性能的影响。结果表明:钼酸钠的加入,有利于提高负极电解液的电化学活性和V(Ⅲ)离子的扩散系数,减小了电荷传递电阻;在0~1.5%含量范围内钼酸钠的添加对负极电解液的低温稳定性无影响。与空白电池相比,添加1.0%钼酸钠电池的容量和能量有所提高,特别是在电流密度达到120 m A/cm^2,放电容量和放电能量提高了25.59%和21.89%。

Used as an additive for the negative electrolyte of vanadium battery,the effects of Na2MoO4 on electrochemical performances and stability of the electrolyte,and properties of the battery were studied. The results indicate that electrochemical activity of the negative electrolyte and diffusion coefficient of V（Ⅲ） species can be enhanced by adding Na2MoO4,with the charge transfer resistance decreased. The stability of negative electrolyte at low temperatures can not be affected when 0 1. 5% of Na2MoO4 is added. Compared with the battery without adding Na2MoO4,capacity and energy of the battery added 1. 0% of Na2MoO4 are increased to a certain extent. Especially,the discharge capacity and discharge energy at 120 mA/cm2 for the battery with adding 1. 0% of Na2MoO4 are increased by 25. 59% and 21. 89%,respectively.