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• W1992540908 abstract "A thorough understanding of the mechanisms of ion crossover through the membranes in vanadium redox flow batteries (VRFBs) is critically important in making improvements to the battery’s efficiency and cycling performance. In this work, we develop a 2-D VRFB model to investigate the mechanisms of ion crossover and the associated impacts it has on the battery’s performance. Unlike previously described models in the literature that simulated a single cell by dividing it into the positive electrode, membrane, and negative electrode regions, the present model incorporates all possible ion crossover mechanisms in the entire cell without a need to specify any interfacial boundary conditions at the membrane/electrode interfaces, and hence accurately captures the Donnan-potential jumps and steep gradient of species concentrations at the membrane/electrode interfaces. With our model, a particular emphasis is given to investigation of the effect of the electric field on vanadium ion crossover. One of the significant findings is that an electric field exists in the membrane even under the open-circuit condition, primarily due to the presence of the H + concentration gradient across the membrane. This finding suggests that vanadium ions can permeate through the membrane from H + -diluted to H + -concentrated sides via migration and convection. More importantly, it is found that the rate of vanadium ion crossover and capacity decay during charge and discharge vary with the magnitude of the electric field, which is influenced by the membrane properties and operating conditions. The simulations suggest that enhancing the electric-field-driven flow is a potential approach to minimizing the battery’s capacity decay." @default.
• W1992540908 created "2016-06-24" @default.
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• W1992540908 date "2015-05-01" @default.
• W1992540908 modified "2023-10-01" @default.
• W1992540908 title "Effects of the electric field on ion crossover in vanadium redox flow batteries" @default.
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• W1992540908 doi "https://doi.org/10.1016/j.apenergy.2015.02.038" @default.
• W1992540908 hasPublicationYear "2015" @default.
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