渡线
钒
荷电状态
电解质
膜
电荷(物理)
电池(电)
离子
化学
电极
计算机科学
物理
热力学
无机化学
功率(物理)
物理化学
生物化学
有机化学
量子力学
人工智能
作者
Theresa Haisch,Hyunjoon Ji,Lucas Holtz,Thorsten Struckmann,Claudia Weidlich
出处
期刊:Membranes
[Multidisciplinary Digital Publishing Institute]
日期:2021-03-24
卷期号:11 (4): 232-232
被引量:18
标识
DOI:10.3390/membranes11040232
摘要
Membranes play a crucial role in efficiency and longevity of flow batteries. Vanadium flow batteries suffer self-discharge and capacity fading due to crossover of electrolyte components through the membrane from one battery half-cell to the other. We consider the impact of vanadium species crossing ion exchange membranes on state of charge of the battery and we present a simple method to determine crossoverll open circuit potential measurements. State of s. State of charge for the negative and positive half-cell is simulated based on assumptions and simplifications for cation and anion exchange membranes and different crossover parameters. We introduce a crossover index “IndXovr” which enables the determination of crossover direction from state of charge data for the negative and positive half-cell and therewith identification of the half-cell in which predominant self-discharge occurs. Furthermore IndXovr allows statements on crossover amount in dependence on state of operation. Simulated case studies are compared to experimental state of charge values estimated from half-cell potential measurements. Our results reveal that half-cell potential monitoring respectively half-cell SOC estimation, is a simple and suitable tool for the identification of crossover direction and relative amount of crossover in VFB.
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