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Membranes 2019, 9(2), 31; https://doi.org/10.3390/membranes9020031

Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries

1
Institute of Chemical Process Engineering, University of Stuttgart, 70199 Stuttgart, Germany
2
Faculty of Natural Science, North-West University, Focus Area: Chemical Resource Beneficiation, Potchefstroom 2520, South Africa
*
Author to whom correspondence should be addressed.
Received: 10 January 2019 / Revised: 29 January 2019 / Accepted: 12 February 2019 / Published: 17 February 2019
(This article belongs to the Special Issue Membranes for Electrolysis, Fuel Cells and Batteries)
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PDF [2798 KB, uploaded 17 February 2019]
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Abstract

Anion exchange blend membranes (AEBMs) were prepared for use in Vanadium Redox Flow Batteries (VRFBs). These AEBMs consisted of 3 polymer components. Firstly, PBI-OO (nonfluorinated PBI) or F6-PBI (partially fluorinated PBI) were used as a matrix polymer. The second polymer, a bromomethylated PPO, was quaternized with 1,2,4,5-tetramethylimidazole (TMIm) which provided the anion exchange sites. Thirdly, a partially fluorinated polyether or a non-fluorinated poly (ether sulfone) was used as an ionical cross-linker. While the AEBMs were prepared with different combinations of the blend polymers, the same weight ratios of the three components were used. The AEBMs showed similar membrane properties such as ion exchange capacity, dimensional stability and thermal stability. For the VRFB application, comparable or better energy efficiencies were obtained when using the AEBMs compared to the commercial membranes included in this study, that is, Nafion (cation exchange membrane) and FAP 450 (anion exchange membrane). One of the blend membranes showed no capacity decay during a charge-discharge cycles test for 550 cycles run at 40 mA/cm2 indicating superior performance compared to the commercial membranes tested. View Full-Text
Keywords: vanadium redox flow battery; anion-exchange blend membrane; F6-PBI; bromomethylated PPO; 1,2,4,5-tetramethylimidazole vanadium redox flow battery; anion-exchange blend membrane; F6-PBI; bromomethylated PPO; 1,2,4,5-tetramethylimidazole
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Cho, H.; Krieg, H.M.; Kerres, J.A. Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries. Membranes 2019, 9, 31.

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