Vanadium Flow Battery Electrolyte Synthesis via Chemical Reduction of V2O5 in Aqueous HCl and H2SO4.

Technical Report · Sun Jan 01 04:00:00 EST 2017

DOI:https://doi.org/10.2172/1342368· OSTI ID:1342368

Small, Leo J. ^[1]; Pratt, Harry ^[1]; Staiger, Chad ^[1]; Martin, Rachel Irene ^[1]; Anderson, Travis Mark ^[1]; Chalamala, Babu ^[1]; Soundappan, Thiagarajan ^[2]; Tiwari, Monika ^[2]; Subarmanian, Venkat R. ^[2]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2. Univ. of Washington, Seattle, WA (United States)

We report a simple method to synthesize V 4+ (VO 2+ ) electrolytes as feedstock for all- vanadium redox flow batteries (RFB). By dissolving V 2 O 5 in aqueous HCl and H 2 SO 4 , subsequently adding glycerol as a reducing agent, we have demonstrated an inexpensive route for electrolyte synthesis to concentrations >2.5 M V 4+ (VO 2+ ). Electrochemical analysis and testing of laboratory scale RFB demonstrate improved thermal stability across a wider temperature range (-10-65 degC) for V 4+ (VO 2+ ) electrolytes in HCl compared to in H 2 SO 4 electrolytes.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Office of Electricity Delivery and Energy Reliability (OE)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1342368
• Report Number(s): SAND--2017-0875; 650763
• Country of Publication: United States
• Language: English

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