A review on the electrolyte imbalance in vanadium redox flow batteries

Vanadium redox flow batteries (VRFBs) are widely used in various stationary applications to enhance power management, improve peak shaving and load leveling, and support a renewable power grid. Although a VRFB has several advantages such as flexibility, long shelf life, and relatively high efficienc...

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Bibliographic Details
Published in:International journal of hydrogen energy 2019-09, Vol.44 (45), p.24485-24509
Main Authors: Jirabovornwisut, Tossaporn, Arpornwichanop, Amornchai
Format: Article
Language:English
Subjects:
Capacity loss
Electrolyte imbalance
Power management
Vanadium redox flow batteries
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Summary:Vanadium redox flow batteries (VRFBs) are widely used in various stationary applications to enhance power management, improve peak shaving and load leveling, and support a renewable power grid. Although a VRFB has several advantages such as flexibility, long shelf life, and relatively high efficiency, there are very few commercially available VRFB systems because of high operating and structure costs. Therefore, considerable efforts are being made to reduce the fixed and variable costs of a VRFB system. For effective handling of the VRFB system, it is essential to understand the operational problems that could occur during a long-term VRFB operation. Electrolyte imbalance is often a major obstacle affecting the battery capacity loss. This paper presents a comprehensive reviews on causes, effects, measurement, and regeneration of the imbalanced electrolyte leading to an understanding for better operation and to manufacture a VRFB commercial system. •Causes and effects of an electrolyte imbalance in a VRFB operation are discussed.•Measurement methods for the SOC to detect the imbalance level are reviewed.•Regeneration methods from imbalance conditions are reported.
ISSN:0360-3199
DOI:10.1016/j.ijhydene.2019.07.106