Ion exchange membrane and method of producing same, membrane electrode assembly, and redox flow battery

An ion-exchange membrane and membrane-electrode assembly technology, applied in the field of ion-exchange membranes, can solve problems such as a decrease in current efficiency

Inactive Publication Date: 2019-02-05
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Permeation of metal ions through the ion-exchange membrane results in a decrease in current efficiency (i.e. the ratio of actual available electrical power to stored electrical power)

Method used

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  • Ion exchange membrane and method of producing same, membrane electrode assembly, and redox flow battery
  • Ion exchange membrane and method of producing same, membrane electrode assembly, and redox flow battery
  • Ion exchange membrane and method of producing same, membrane electrode assembly, and redox flow battery

Examples

Experimental program
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Effect test

Embodiment

[0079] Hereinafter, exemplary aspects of the present invention will be additionally described using examples, but the present invention is not limited by these examples.

[0080] Ionically Conductive Polymer Dispersions

[0081] The ion-conductive polymer dispersions used are as follows.

[0082] Dispersion 1: Perfluorocarbon sulfonate polymer (sulfonic acid equivalent mass 725, described in U.S. Unexamined Patent Application Publication 2006 / 0014887) in ethanol-water (75 / 25 by mass) mixture A dispersion at a solid concentration of 30% by mass in a dispersion solvent.

[0083] Dispersion 2: Perfluorocarbon sulfonate polymer (sulfonic acid equivalent mass of 825, described in U.S. Unexamined Patent Application Publication 2006 / 0014887) in ethanol-water (mass ratio 75 / 25) mixture A dispersion at a solid concentration of 30% by mass in a dispersion solvent.

[0084] Dispersion 3: Perfluorocarbon sulfonate polymer (sulfonic acid equivalent mass 1000, described in U.S. Unexami...

Embodiment 1 to 10 and comparative example 5 to 9

[0096] For Examples 1 and 8 to 10, Base Film 2 was used, and for Examples 2 to 7, Base Film 1 was used. For Comparative Examples 5 to 6, Base Film 1 was used, and for Comparative Examples 7 to 9, Base Film 2 was used. See Table 1 for the nonwoven fabric used for each sample.

[0097] After electrospinning the specific nonwoven onto the base film (see the corresponding nonwoven and its properties in Table 1 below), the third dispersion was manually coated onto the nonwoven, and the samples were heated at 70°C. Dry for 5 minutes, then dry at 150°C for 10 minutes. Thus, an ion exchange membrane was obtained. The third dispersion used was as follows: Dispersion 5 was used for Examples 1 and 8 to 10, Dispersion 4 was used for Examples 2 to 7, and Dispersion 4 was used for Comparative Examples 5 and 6, and Dispersion 4 was used for Comparative Examples 7 to 6. 9 using dispersion 5.

[0098] Figure 2A and Figure 2B Examples of nonwoven fabrics used in Examples and Comparative...

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Abstract

Object: To provide an ion exchange membrane which can achieve both high proton transport ability and high ion permeation selectivity, a membrane-electrode assembly including said ion exchange membrane, and a redox flow battery including said membrane-electrode assembly. Resolution Means: One aspect of the present disclosure provides an ion exchange membrane for a redox flow battery including an ion-conductive polymer and a non-woven fabric, wherein the non-woven fabric is disposed in the ion-conductive polymer. Another aspect of the present disclosure provides a membrane-electrode assembly including a positive electrode, a negative electrode, and the ion exchange membrane for a redox flow battery of the present disclosure, wherein the ion exchange membrane for a redox flow battery is disposed between the positive electrode and the negative electrode. Another aspect of the present disclosure provides a redox flow battery including a membrane-electrode assembly of the present disclosure.Yet another aspect of the present disclosure provides a method for producing an ion exchange membrane for a redox flow battery.

Description

technical field [0001] The present disclosure relates to ion exchange membranes and methods for producing ion exchange membranes, membrane electrode assemblies and redox flow batteries. Background technique [0002] In general, a redox flow battery includes a positive cell including a positive electrolyte solution and a positive electrode, a negative cell including a negative electrolyte solution and a negative electrode, and an ion exchange membrane arranged to separate the positive and negative cells. Positive and negative electrolyte solutions are supplied from respective tanks to each of the positive and negative cells, and are circulated back to the corresponding slot. In a redox flow battery, the positive electrolyte solution and the negative electrolyte solution may contain the same kind of metal ions. For example, in a vanadium-type redox flow battery, a combination of a positive electrolyte solution and a negative electrolyte solution is used, wherein the positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01B1/12C08J5/22H01M8/1044
CPCH01B1/122H01B1/125H01M8/188C08J5/2262C08J2371/02H01M2300/0082H01M8/1039H01M8/106H01M8/1062H01M8/1023Y02E60/50H01M8/1044
Inventor 野田一树弘重裕司
Owner 3M INNOVATIVE PROPERTIES CO
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