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Issue 7, 2020
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Suppressing vanadium crossover using sulfonated aromatic ion exchange membranes for high performance flow batteries

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Abstract

Liquid flow batteries have potential to achieve high energy efficiency as a large-scale energy storage system. However, the ion exchange membranes (IEMs) currently used in flow batteries do not have high ion selectivity and conductance at the same time, owing to the trade-off between ionic membrane resistance and ion selectivity. Here, we report a rationally designed sulfonated aromatic polymer membrane which can greatly mitigate the trade-off limitation and achieve high performance vanadium RFB. Small-angle X-ray scattering studies and density functional theory calculations indicated that the narrowly distributed aqueous ionic domain of just the right width (<7 Å) and the strong hydrogen bond interaction of vanadium species with a unique polymer side chain structure play a key role in improving the ion selectivity. Our systematic studies of the polymer structures, morphologies, and transport properties provide valuable insight that can aid in elucidating the structure–property relationship of IEMs and in establishing design criteria for the development of high-performance membranes.

Graphical abstract: Suppressing vanadium crossover using sulfonated aromatic ion exchange membranes for high performance flow batteries

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Supplementary files

Article information


Submitted
14 Jul 2020
Accepted
26 Aug 2020
First published
01 Sep 2020

This article is Open Access

Mater. Adv., 2020,1, 2206-2218
Article type
Communication

Suppressing vanadium crossover using sulfonated aromatic ion exchange membranes for high performance flow batteries

T. Wang, J. Han, K. Kim, A. Münchinger, Y. Gao, A. Farchi, Y. Choe, K. Kreuer, C. Bae and S. Kim, Mater. Adv., 2020, 1, 2206
DOI: 10.1039/D0MA00508H

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