Ion-selective membrane for redox flow batteries
| DWPI Title: Ion-selective membrane used in redox flow battery comprises fluoro sulfonated poly(phenylene) in which core aryl groups of poly(phenylene) backbone are partially substituted with sulfonic acid and aryl groups pendent to backbone are partially substituted with electron-withdrawing fluorocarbon group |
| Abstract: A fluoro sulfonated poly(phenylene) was rationally designed with an external hydrophobic shell and internal hydrophilic core in order to improve the durability and ion selectivity of a hydrocarbon membrane for vanadium redox flow batteries (VRFBs). The polymer was designed to prevent hydrophilic polymer chain aggregation by attaching acid moieties onto the polymer backbone, while functionalizing the external polymer shell with hydrophobic side chains to prevent excessive vanadium crossover associated with cation exchange membranes. As an example, the hydrophobic shell can be provided by pentafluorobenzoyl group functionalization of the pendent aryl groups on a Diels Alder poly(phenylene) backbone, while the internal polymer chain can contain sulfonic acid moieties to impart hydrophilic character. |
| Use: The membrane is useful in a redox flow battery (claimed). |
| Advantage: The membrane: improves the durability and ion selectivity; prevents hydrophilic polymer chain aggregation by attaching acid moieties onto the polymer backbone; provides low ion permeability quickly diminishes with the increase in the current density, as a result Nafion -212 (Perfluorinated membrane) shows comparable discharge capacity at 200 mA cm-2 ; exhibits high mechanical and chemical stability; and is economical. |
| Novelty: Ion-selective membrane comprises a fluoro sulfonated poly(phenylene), where core aryl groups of the poly(phenylene) backbone are at least partially substituted with a sulfonic acid group and the aryl groups pendent to the backbone are at least partially substituted with an electron-withdrawing fluorocarbon group. |
| Filed: 8/2/2021 |
| Application Number: US17391508A |
| Tech ID: SD 15330.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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