Chemistry

Communication—sulfonated poly (ether ether ketone) as cation exchange membrane for alkaline redox flow batteries

Document Type

Article

Abstract

A sulfonated poly (ether ether ketone) (sPEEK) was tested as the separator in a full alkaline flow battery with 2,6-dihydroxyanthraquinone-ferro/ferricyanide, DHAQ-FeCy, redox couples. Cell performance was compared to that of an identical cell utilizing a perfluorosulfonic acid (PFSA) membrane. Replacement of the PFSA membrane with sPEEK resulted in a 10% power density increase, a 40% decrease in capacity loss per day and an 85-fold decrease in ferricyanide permeation. Though long-term stability of sPEEK in alkaline media requires improvement, these results highlight the potential to produce non-fluorinated membranes with better performance in organic redox flow batteries than the commercially available PFSAs.

Publication Title

Journal of the Electrochemical Society

Publication Date

1-2018

Volume

165

Issue

5

First Page

A1137

Last Page

A1139

ISSN

0013-4651

DOI

10.1149/2.1291805jes

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