Effects of additives on the stability of electrolytes for all-vanadium redox flow batteries
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The stability of the electrolytes for all-vanadium redox flow battery was investigated with ex-situ heating/cooling treatment and in situ flow-battery testing methods. The effects of inorganic and organic additives have been studied. The additives containing the ions of potassium, phosphate, and polyphosphate are not suitable stabilizing agents because of their reactions with V(V) ions, forming precipitates of KVSO6 or VOPO4. Of the chemicals studied, polyacrylic acid and its mixture with CH3SO3H are the most promising stabilizing candidates which can stabilize all the four vanadium ions (V2+, V3+, VO2+, and VO2 +) in electrolyte solutions up to 1.8 M. However, further effort is needed to obtain a stable electrolyte solution with >1.8 M V5+ at temperatures higher than 40 °C.
KeywordsAll vanadium redox flow batteries Electrolyte stability Stabilizing agent Vanadium ions Energy storage
This work was supported by the Office of Electricity Delivery & Energy Reliability (OE, project manager: Dr. Imre Gyuk), U.S. Department of Energy (DOE) under contract #57558, and by the Pacific Northwest National Laboratory (PNNL) Laboratory Directed Research and Development (LDRD) program.
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