Effects of additives on the stability of electrolytes for all-vanadium redox flow batteries

Journal Article · Sat Oct 01 04:00:00 EDT 2011 · Journal of Applied Electrochemistry, 41(10 - Special Issue S1):1215-1221

DOI:https://doi.org/10.1007/s10800-011-0312-1· OSTI ID:1029085

Zhang, Jianlu; Li, Liyu; Nie, Zimin; Chen, Baowei; Vijayakumar, M.; Kim, Soowhan; Wang, Wei; Schwenzer, Birgit; Liu, Jun; Yang, Zhenguo

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1029085
• Report Number(s): PNNL-SA-76986; 13499d; TE1400000
• Journal Information: Journal of Applied Electrochemistry, 41(10 - Special Issue S1):1215-1221, Journal Name: Journal of Applied Electrochemistry, 41(10 - Special Issue S1):1215-1221 Journal Issue: 10 Vol. 41; ISSN 0021-891X; ISSN JAELBJ
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ADDITIVES
All vanadium redox flow batteries
ELECTROLYTES
Electrolyte stability
Energy storage
Environmental Molecular Sciences Laboratory
MIXTURES
POTASSIUM
REDOX FLOW BATTERIES
STABILITY
Stabilizing agent
TESTING
VANADIUM IONS
Vanadium ions