对钒电池负极电解液中活性物质V(Ⅲ)在不同硫酸浓度、不同温度条件下的溶解性规律进行了深入研究,同时对V(Ⅲ)-H2SO4体系电化学性能进行了初步探讨.结果表明:V(Ⅲ)的溶解是一个放热过程,在15～40℃范围内,V(Ⅲ)的溶解度随着温度升高而逐渐降低；并且溶液中V(Ⅲ)会以V-O-V形式形成二聚体,在低硫酸浓度下,V(Ⅲ)可以高浓度长时间稳定存在,随硫酸浓度的增大,V(Ⅲ)溶解度逐渐降低,其中30℃、1 mol/L H2SO4条件下V(Ⅲ)浓度可高达2.730 mol/L;进一步通过电化学测试,发现V(Ⅲ)-H2SO4体系是不可逆体系,H2SO4浓度的增大有益于提高V(Ⅲ)/V(Ⅱ)氧化还原反应的可逆性.
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