Towards Understanding the Poor Thermal Stability of V5+ Electrolyte Solution in Vanadium Redox Flow Batteries

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Journal of Power Sources, 196(7):3669-3672

DOI:https://doi.org/10.1016/j.jpowsour.2010.11.126· OSTI ID:1012871

Vijayakumar, M; Li, Liyu; Graff, Gordon L; Liu, Jun; Zhang, Huamin; Yang, Zhenguo; Hu, Jian Z

The V5+ electrolyte solution from vanadium redox flow batteries was studied by variable temperature 17O and 51V Nuclear Magnetic Resonance (NMR) spectroscopy and DFT based computational modeling. It was found that the V5+ species exist as hydrated penta co-ordinated vanadate ion, i.e. [VO2(H2O)3]1+. This hydrated structure is not stable at elevated temperature and change into neutral H3VO4 molecule via a deprotonation process. H3VO4 species is also knowingly unstable, leading to the observed V2O5 precipitation in V5+ electrolyte solutions.

• 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: 1012871
• Report Number(s): PNNL-SA-75255; 44591; 30406
• Journal Information: Journal of Power Sources, 196(7):3669-3672, Journal Name: Journal of Power Sources, 196(7):3669-3672 Journal Issue: 7 Vol. 196; ISSN JPSODZ; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
DENSITY FUNCTIONAL METHOD
ELECTROLYTES
Environmental Molecular Sciences Laboratory
HYDRATES
NUCLEAR MAGNETIC RESONANCE
PRECIPITATION
REDOX FLOW BATTERIES
STABILITY
VANADATES
VANADIUM