Capacity Decay Mitigation by Asymmetric Positive/Negative Electrolyte Volumes in Vanadium Redox Flow Batteries

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Capacity decay in vanadium redox flow batteries during charge-discharge cycling has become an important issue because it lowers the practical energy density of the battery. The battery capacity tends to drop rapidly within the first tens of cycles and then drops more gradually over subsequent cycles during long-term operation. This paper analyzes and discusses the reasons for this early capacity decay. The imbalanced crossover rate of vanadium species was found to remain high until the total difference in vanadium concentration between the positive and negative electrolytes reached almost 1 mol dm(-3). To minimize the initial crossover imbalance, we introduced an asymmetric volume ratio between the positive and negative electrolytes during cell operation. Changing this ratio significantly reduced the capacity fading rate of the battery during the early cycles and improved its capacity retention at steady state. As an example, the practical energy density of the battery increased from 15.5 to 25.2 Wh L-1 simply after reduction of the positive volume by 25%.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2016-11
Language
English
Article Type
Article
Keywords

ANION-EXCHANGE MEMBRANES; HIGH-ENERGY DENSITY; POSITIVE ELECTROLYTE; FUNCTIONAL-GROUPS; ADDITIVES; TEMPERATURE; STABILITY; STORAGE; ACID

Citation

CHEMSUSCHEM, v.9, no.22, pp.3181 - 3187

ISSN
1864-5631
DOI
10.1002/cssc.201601110
URI
http://hdl.handle.net/10203/214793
Appears in Collection
CBE-Journal Papers(저널논문)
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