US2014342268A1PendingUtilityA1

Redox flow secondary battery and electrolyte membrane for redox flow secondary battery

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Assignee: ASAHI KASEI E MATERIALS CORPPriority: Dec 28, 2011Filed: Dec 27, 2012Published: Nov 20, 2014
Est. expiryDec 28, 2031(~5.5 yrs left)· nominal 20-yr term from priority
Inventors:Akihiro KatoNaoto Miykae
Y02E60/50H01M 2300/0082H01M 8/20H01M 8/1039H01M 8/188H01M 2008/1095H01M 8/1023H01M 8/0289
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Claims

Abstract

The problem addressed by the present invention is to obtain an electrolyte membrane that, as an electrolyte membrane for a redox flow secondary battery, is able to suppress the ion permeability of an active substance without detracting from proton (H+) permeability, has superior ion-selective permeability, has low electrical resistivity, and has superior current efficiency. The present invention solves the abovementioned problem by means of the electrolyte membrane for a redox flow secondary battery containing a perfluorocarbon sulfonic acid resin having a specific structure and an equivalent weight (EW), and the ion conductivity being adjusted to a predetermined range.

Claims

exact text as granted — not AI-modified
1 - 10 . (canceled) 
     
     
         11 . A redox flow secondary battery comprising an electrolytic bath comprising:
 a positive electrode cell chamber comprising a positive electrode composed of a carbon electrode;   a negative electrode cell chamber comprising a negative electrode composed of a carbon electrode; and   an electrolyte membrane as a diaphragm to separate the positive electrode cell chamber and the negative electrode cell chamber,   wherein the positive electrode cell chamber comprises a positive electrode electrolyte solution comprising a positive electrode active substance; and the negative electrode cell chamber comprises a negative electrode electrolyte solution comprising a negative electrode active substance;   wherein the redox flow secondary battery charges and discharges based on changes in valences of the positive electrode active substance and the negative electrode active substance in the electrolyte solutions;   wherein the electrolyte membrane comprises an ion-exchange resin composition comprising a perfluorocarbonsulfonic acid resin having a structure represented by the following formula (1):
   —[CF 2 —CF 2 ] a —[CF 2 —CF(—O—(CF 2 ) m —SO 3 H)] g —  (1)
 
   
       wherein a and g represent numbers satisfying 0≦a<1, 0<g≦1, and a+g=1; and m represents an integer of 1 to 6;
 wherein the perfluorocarbonsulfonic acid resin has an equivalent weight EW (a dry mass in grams per equivalent of ion-exchange groups) of 250 to 1,500 g/eq; and 
 wherein the electrolyte membrane has an ionic conductivity at 110° C. at a relative humidity of 50% RH of 0.05 S/cm or higher. 
 
     
     
         12 . The redox flow secondary battery according to  claim 11 , wherein the perfluorocarbonsulfonic acid resin has an equivalent weight EW (a dry mass in grams per equivalent of ion-exchange groups) of 250 to 700 g/eq. 
     
     
         13 . The redox flow secondary battery according to  claim 11 , wherein the positive electrode electrolyte solution and the negative electrode electrolyte solution are sulfuric acid electrolyte solutions comprising vanadium. 
     
     
         14 . The redox flow secondary battery according to  claim 11 , wherein the electrolyte membrane has an equilibrium moisture content of 5 to 80% by mass. 
     
     
         15 . The redox flow secondary battery according to  claim 12 , wherein the electrolyte membrane has an equilibrium moisture content of 5 to 80% by mass. 
     
     
         16 . The redox flow secondary battery according to  claim 11 , wherein the ion-exchange resin composition comprises 0.1 to 20 parts by mass of a polyphenylene ether resin and/or a polyphenylene sulfide resin with respect to 100 parts by mass of the perfluorocarbonsulfonic acid resin. 
     
     
         17 . The redox flow secondary battery according to  claim 12 , wherein the ion-exchange resin composition comprises 0.1 to 20 parts by mass of a polyphenylene ether resin and/or a polyphenylene sulfide resin with respect to 100 parts by mass of the perfluorocarbonsulfonic acid resin. 
     
     
         18 . An electrolyte membrane for a redox flow secondary battery, comprising an ion-exchange resin composition comprising a perfluorocarbonsulfonic acid resin having a structure represented by the following formula (1):
   —[CF 2 —CF 2 ] a —[CF 2 —CF(—O—(CF 2 ) m —SO 3 H)] g —  (1)
   
       wherein a and g represent numbers satisfying 0≦a<1, 0<g≦1, and a+g=1; and m represents an integer of 1 to 6;
 wherein the perfluorocarbonsulfonic acid resin has an equivalent weight EW (a dry mass in grams per equivalent of ion-exchange groups) of 250 to 1,500 g/eq; and 
 wherein the electrolyte membrane has an ionic conductivity at 110° C. at a relative humidity of 50% RH of 0.05 S/cm or higher. 
 
     
     
         19 . The electrolyte membrane for the redox flow secondary battery according to  claim 18 , wherein the perfluorocarbonsulfonic acid resin has an equivalent weight EW (a dry mass in grams per equivalent of ion-exchange groups) of 250 to 700 g/eq. 
     
     
         20 . The electrolyte membrane for the redox flow secondary battery according to  claim 18 , wherein the electrolyte membrane has an equilibrium moisture content of 5 to 80% by mass. 
     
     
         21 . The electrolyte membrane for the redox flow secondary battery according to  claim 19 , wherein the electrolyte membrane has an equilibrium moisture content of 5 to 80% by mass. 
     
     
         22 . The electrolyte membrane for the redox flow secondary battery according to  claim 18 , wherein the ion-exchange resin composition comprises 0.1 to 20 parts by mass of a polyphenylene ether resin and/or a polyphenylene sulfide resin with respect to 100 parts by mass of the perfluorocarbonsulfonic acid resin. 
     
     
         23 . The electrolyte membrane for the redox flow secondary battery according to  claim 19 , wherein the ion-exchange resin composition comprises 0.1 to 20 parts by mass of a polyphenylene ether resin and/or a polyphenylene sulfide resin with respect to 100 parts by mass of the perfluorocarbonsulfonic acid resin. 
     
     
         24 . The electrolyte membrane for the redox flow secondary battery according to  claim 20 , wherein the ion-exchange resin composition comprises 0.1 to 20 parts by mass of a polyphenylene ether resin and/or a polyphenylene sulfide resin with respect to 100 parts by mass of the perfluorocarbonsulfonic acid resin. 
     
     
         25 . The electrolyte membrane for the redox flow secondary battery according to  claim 18 , wherein the ion-exchange resin composition has been subjected to a heat treatment at 130 to 200° C. for 1 to 60 min. 
     
     
         26 . The electrolyte membrane for the redox flow secondary battery according to  claim 19 , wherein the ion-exchange resin composition has been subjected to a heat treatment at 130 to 200° C. for 1 to 60 min. 
     
     
         27 . The electrolyte membrane for the redox flow secondary battery according to  claim 20 , wherein the ion-exchange resin composition has been subjected to a heat treatment at 130 to 200° C. for 1 to 60 min. 
     
     
         28 . The electrolyte membrane for the redox flow secondary battery according to  claim 22 , wherein the ion-exchange resin composition has been subjected to a heat treatment at 130 to 200° C. for 1 to 60 min.

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