Membrane Permeability Rates of Vanadium Ions and Their Effects on Temperature Variation in Vanadium Redox Batteries

Liuyue Cao, Anders Kronander, Ao Tang, Da-Wei Wang and Maria Skyllas-Kazacos
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Liuyue Cao: School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Anders Kronander: School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Ao Tang: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Da-Wei Wang: School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Maria Skyllas-Kazacos: School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia

Energies, 2016, vol. 9, issue 12, 1-15

Abstract: The inevitable diffusion of vanadium ions across the membrane can cause considerable capacity loss and temperature increase in vanadium redox flow batteries (VRFBs) over long term operation. Reliable experimental data of the permeability rates of vanadium ions are needed for membrane selection and for use in mathematical models to predict long-term behavior. In this paper a number of ion exchange membranes were selected for detailed evaluation using a modified approach to obtain more accurate permeation rates of V 2+ , V 3+ , VO 2+ and VO 2 + ions. Three commercial ion exchange membranes—FAP450, VB2 and F930—are investigated. The obtained diffusion coefficients are then employed in dynamic models to predict the thermal behavior under specific operating conditions. The simulation results prove that smaller and more balanced permeability rates of V 2+ and VO 2 + ions are more important to avoid large temperature increases in the cell stack during stand-by periods at high states-of-charge with pumps off.

Keywords: permeability rates; diffusion; crossover; ion exchange membrane; vanadium redox flow batteries (VRFBs); capacity; side reactions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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