Polymer electrolyte membrane, method for fabricating same, and membrane-electrode assembly comprising same

Patent metadata

Field	Value
Publication number	US-10535890-B2
Application number	US-201415025657-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

Provided are a polymer electrode membrane including a porous support including a web of nanofibers of a first hydrocarbon-based ion conductor that are arranged irregularly and discontinuously; and a second hydrocarbon-based ion conductor filling the pores of the porous support, the first hydrocarbon-based ion conductor being a product obtained by eliminating at least a portion of the protective groups (Y) in a precursor of the first hydrocarbon-based ion conductor represented by Formula (1), a method for producing the polymer electrolyte membrane, and a membrane electrode assembly including the polymer electrolyte membrane:

wherein m, p, q, M, M′, X and Y respectively have the same meanings as defined in the specification.

First claim

What is claimed is:

1. A method for producing a composite polymer electrolyte membrane, the method comprising:
preparing a first solution by dissolving a precursor of a first hydrocarbon-based ion conductor in a first solvent, the first hydrocarbon-based ion conductor being a sulfonated polyether ketone-based crystalline polymer which is insoluble in the first solvent;
producing a nanoweb structure by electric spinning and subsequently heat treating the first solution;
eliminating protective groups from the precursor of the nanoweb structure, thereby converting the precursor into the first hydrocarbon-based ion conductor and producing a porous support of the nanoweb structure containing the first hydrocarbon-based ion conductor; and
filling pores of the porous support with a second hydrocarbon-based ion conductor by (i) applying a second solution prepared by dissolving the second hydrocarbon-based ion conductor in a second solvent in which the first hydrocarbon-based ion conductor is insoluble to the porous support and (ii) removing the second solvent.

2. The method according to claim 1 , wherein the second hydrocarbon-based ion conductor is a compound of the following Chemical Formula (4):

wherein
n represents 0.01 to 0.1;
p and q each are an integer from 0 to 4, while p and q are not zero (0) at the same time;
M and M′ each independently are any one selected from the group consisting of a hydrogen atom, a metal cation and an ammonium cation; and
V and W each independently are a divalent organic group of the following Chemical Formula (5):

wherein X 1 is a single bond, or represents any one selected from the group consisting of an alkylene group having 1 to 5 carbon atoms and a fluoroalkylene group having 1 to 5 carbon atoms.

3. The method according to claim 1 , wherein the eliminating protective groups is carried out by acid-treating the nanoweb structure.

4. The method according to claim 1 , wherein the heat treating the electric spinned first solution is carried out at a temperature of 100° C. to 250° C. for a period of time of 1 minute to 1 hour.

5. The method according to claim 1 , wherein the first hydrocarbon-based ion conductor is a sulfonated polyether ether ketone-ether sulfone block copolymer or a sulfonated polyether ether ketone-ether sulfone random copolymer and has a degree of sulfonation of 1 mol % to 40 mol %.

Assignees

• Kolon Inc

Inventors

• Lee Moo Seok
• Lee Dong Hoon
• Shin Yong Cheol
• Kim Na Young
• Lee Eun Su
• Cho Han Moon

Classifications

• H01M8/0293 Primary

  Matrices for immobilising electrolyte solutions · CPC title

• H01M8/1069

  characterised by the manufacturing processes · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M8/1027

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

• H01M8/1018

  Polymeric electrolyte materials · CPC title