钒电池电解液配比的优化及其对电池性能的影响  

Optimization of the electrolyte ratio for the vanadium flow battery and its effect on the battery performance

作　　者：王绍亮[1] 范新庄[1] 张建国[1] 吴晓亮[1] 刘建国[1] 严川伟[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《储能科学与技术》2015年第5期510-514,共5页Energy Storage Science and Technology

摘　　要：电解液是钒电池能量存储的核心,其组成对电池的能量转化效率、循环稳定性等具有显著影响。本工作针对正负极电解液体积比、电解液价态,较系统地考察了它们对钒电池电化学性能的影响规律。结果表明,保持正极电解液体积不变,单纯增加负极的体积,可提高电池的放电容量,但对电池的能量转换效率影响较小;电解液价态的升高会在一定程度上降低钒电池的放电容量,但其能量转换效率却呈现先升高后降低的抛物线规律;增加负极电解液体积和提高电解液价态均会导致负极活性物质过量,但后者对电池性能的影响更为显著,在后者的基础上前者对能量转换效率的影响也会被放大。Electrolyte of vanadium flow battery（VFB） is the key component of the energy storage unit, which plays an important role in the energy conversion efficiency and cycle stability performance of VFB. Considering the volume ratio of the catholyte and anolyte, also the electrolyte valence state, the effect of the excess of negative active reactant on the electrochemical performance of VFB is systematically investigated. The results show that the increasing the volume of the anolyte with the same catholyte improves the discharge capacity for VFB, but has less effect on the energy conversion efficiency. The increasement of the electrolyte valence lead to a reduced discharge capacity of VFB in some extent, while the energy conversion efficiency increases at first and then decreases, conforming to a parabola law. Increasing of the volume of anolyte and electrolyte valence state result in the excess of the negative active reactant, the latter has more significant effect on the battery performance of VFB. However, the effect of anolyte volume will be enlarged with the existence of exec valence state.

关 键 词：钒电池 电解液体积 电解液价态 放电容量 能量转换效率 

分 类 号：TM911[电气工程—电力电子与电力传动]