Electrolyte membrane of membrane-electrode assembly including electronic insulation layer and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11967746-B2
Application number	US-201916694222-A
Country	US
Kind code	B2
Filing date	Nov 25, 2019
Priority date	Mar 28, 2019
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

Disclosed are an electrolyte membrane of a membrane-electrode assembly including an electronic insulation layer, which greatly improves the durability of the electrolyte membrane, and a method of preparing the same. The electrolyte membrane includes an ion exchange layer and an electronic insulation layer provided on the ion exchange layer, and the electronic insulation layer includes one or more catalyst complexes, and a second ionomer Particularly, each of the one or more catalyst complex includes a catalyst particle and a first ionomer coated on the entirety or a portion of the surface of the catalyst particle, and the one or more catalyst complexes are dispersed the second ionomer.

First claim

What is claimed is:

1. An electrolyte membrane of a membrane-electrode assembly, comprising:
an ion exchange layer; and
an electronic insulation layer provided on the ion exchange layer,
wherein the electronic insulation layer comprises:
one or more catalyst complexes, each of which comprises a catalyst particle and a first ionomer coated on an entire surface of all of the catalyst particle; and
a second ionomer comprising a polymer matrix dispersing the one or more catalyst complexes,
wherein the first ionomer comprises a polymer material having a shorter side chain group than the polymer matrix of the second ionomer.

2. The electrolyte membrane according to claim 1 , wherein the ion exchange layer comprises a porous reinforcement layer, a first ion exchange layer provided on a first surface of the reinforcement layer, and a second ion exchange layer provided on a second surface of the reinforcement layer.

3. The electrolyte membrane according to claim 1 , wherein the ion exchange layer comprises an ion exchange material.

4. The electrolyte membrane according to claim 3 , wherein the ion exchange material is the same as the second ionomer.

5. The electrolyte membrane according to claim 1 , wherein the catalyst particle comprises a catalyst metal and a carbon support, wherein the catalyst metal is supported on the carbon support.

6. The electrolyte membrane according to claim 5 , wherein the catalyst metal comprises platinum (Pt).

7. The electrolyte membrane according to claim 1 , wherein at least one of the first ionomer and the second ionomer comprises perfluorosulfonic acid (PFSA).

8. The electrolyte membrane according to claim 1 , wherein the electronic insulation layer comprises an amount of about 0.5 wt % to 5 wt % of the catalyst particles based on the total weight of the electronic insulation layer.

9. A membrane-electrode assembly comprising:
an electrolyte membrane according to claim 1 ; and
a pair of electrodes provided on both surfaces of the electrolyte membrane.

10. A fuel cell comprising a membrane-electrode assembly according to claim 9 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Byoung Su
• Kim Yong Min
• Yu Ha Yeong
• Choi Jin Yi
• Park Ju Ahn
• Lee Ju Young
• Kim Jung Ik
• Kim Min Kyung

Classifications

• H01M8/1053 Primary

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

• H01M4/881

  Electrolytic membranes · CPC title

• H01M4/8828

  Coating with slurry or ink · CPC title

• H01M4/92

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title