Highly ion-selective composite polymer electrolyte membranes comprising metal-ion blocking layer, redox flow batteries comprising the same, and electrochemical devices comprising the same

Patent metadata

Field	Value
Publication number	US-2020168937-A1
Application number	US-201916691610-A
Country	US
Kind code	A1
Filing date	Nov 22, 2019
Priority date	Nov 23, 2018
Publication date	May 28, 2020
Grant date	—

Abstract

Disclosed is a composite polymer electrolyte membrane comprising: a support membrane; a metal ion-blocking layer stacked on the support membrane; a stabilization layer; and a protecting layer, wherein the support membrane includes a cation conductive polymer.

First claim

What is claimed is:

1 . A composite polymer electrolyte membrane comprising:
a support membrane; and a metal ion-blocking layer stacked on the support membrane, wherein the support membrane comprises a cation conductive polymer.

2 . The composite polymer electrolyte membrane according to claim 1 , wherein the support membrane comprises a non-porous separator comprising a cation conductive polymer or a porous separator of which pores are filled with a cation conductive polymer.

3 . The composite polymer electrolyte membrane according to claim 1 , which further comprises a stabilization layer formed on the metal ion-blocking layer.

4 . The composite polymer electrolyte membrane according to claim 3 , wherein the stabilization layer has fluorine or silicon functional groups attached thereto or is doped with fluorine elements or silicon elements.

5 . The composite polymer electrolyte membrane according to claim 3 , wherein the stabilization layer has a thickness range of 0.1-10 nm.

6 . The composite polymer electrolyte membrane according to claim 1 , wherein the cation conductive polymer comprises a cation exchange group selected from the group consisting of a sulfonic acid group, phosphoric acid group and a carboxylic acid group.

7 . The composite polymer electrolyte membrane according to claim 6 , wherein the sulfonic acid group-containing cation conductive polymer is selected from the group consisting of perfluorosulfonic acid, poly(styrene sulfonic acid) (PSSA), sulfonated poly(ether ether ketone) (SPEEK), sulfonated poly(ether sulfone) (SPES), sulfonated poly(aryl ether ketone) (SPAEK), sulfonated polybenzimidazole (S-PBI), sulfonated poly(phenylene oxide) (SPPO), and sulfonated polyimide (SPI).

8 . The composite polymer electrolyte membrane according to claim 1 , wherein the cation conductive polymer is a perfluorosulfonic acid-based electrolyte or hydrocarbon-based polymer electrolyte.

9 . The composite polymer electrolyte membrane according to claim 2 , wherein the porous separator comprises at least one polymer selected from the group consisting of polyethylene (PE), polysulfide (PS), polypropylene (PP), polycarbonate (PC), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polyvinylidene difluoride (PVdF), polyacrylonitrile (PAN), and polyimide (PI).

10 . The composite polymer electrolyte membrane according to claim 1 , wherein the metal ion-blocking layer comprises an anion exchange polymer or anion exchange polymer electrolyte material.

11 . The composite polymer electrolyte membrane according to claim 10 , wherein the anion exchange polymer is at least one selected from the group consisting of polypyrrole, polyaniline, fluorinated polyaniline and poly(fluoroaniline), polypyridine, polyazepine, polycarbazole, and polyindole, and
the anion exchange polymer electrolyte material is a chloro- or bromomethylated polymer to which at least one anion exchange group selected from trimethyl amine, imidazolium, phosphonium, ammonium, guanidinium and benzimidazolium is bound.

12 . The composite polymer electrolyte membrane according to claim 11 , wherein the polymer to which at least one anion exchange group is bound is at least one polymer selected from polysulfone, polyetheretherketone, polyphenylene oxide and polyethylene.

13 . The composite polymer electrolyte membrane according to claim 11 , wherein the anion exchange polymer comprises polyaniline in the emeraldine state.

14 . The composite polymer electrolyte membrane according to claim 1 , which comprises at least one metal ion-blocking layer.

15 . The composite polymer electrolyte membrane according to claim 1 , wherein the metal ion-blocking layer is protonated.

16 . The composite polymer electrolyte membrane according to claim 1 , wherein the metal ion-blocking layer has a thickness of 100 μm or less.

17 . The composite polymer electrolyte membrane according to claim 1 , which further comprises a protective layer, and the protective layer comprises a cation conductive polymer.

18 . A redox flow battery comprising the composite polymer electrolyte membrane as defined in claim 1 .

19 . An electrochemical reactor comprising the composite polymer electrolyte membrane as defined in claim 1 .

Assignees

• Korea Inst Sci & Tech

Inventors

• Ahn Ji Hun
• Ha Heung Yong
• Mehboob Sheeraz

Classifications

• H01M8/1053 Primary

  consisting of layers of polymers with at least one layer being ionically conductive · CPC title

• H01M8/1027

  having carbon, oxygen and other atoms, e.g. sulfonated polyethersulfones [S-PES] · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M8/1039

  halogenated, e.g. sulfonated polyvinylidene fluorides · CPC title

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title