Ion exchange membrane suitable for redox flow battery
AssigneeAGC Inc.
InventorsYasushi Yamaki, Kosuke Sumikura, Tatsuya Miyajima, Takuo Nishio
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Abstract
The present invention provides an ion exchange membrane can improve the current efficiency of a redox flow battery without a drop in voltage efficiency, when used in the redox flow battery. The ion exchange membrane of the present invention is an ion exchange membrane comprising a fluorinated polymer having sulfonic acid functional groups, wherein the difference (D−Dc) between the distance D between ionic clusters and the diameter Dc of ionic clusters as measured by the small angle X-ray scattering is 0.60 nm or more, and the ion exchange capacity of the fluorinated polymer is 0.95 meq/gram dry resin or more.
Claims10
A redox flow battery, comprising an ion exchange membrane comprising a fluorinated polymer having sulfonic acid functional groups, wherein a diameter Dc of ionic clusters is from 3.53 to 4.40 nm, the distance D between ionic clusters is from 4.25 to 5.00 nm, the difference (D-Dc) between the distance D between ionic clusters and the diameter De of ionic clusters as measured by small angle X-ray scattering is at least 0.60 nm, and the ion exchange capacity of the fluorinated polymer is at least 0.95 meq/g dry resin.
Dependencies are inferred from the claim text.