Electrochemical device

Patent metadata

Field	Value
Publication number	US-12148935-B2
Application number	US-202117323905-A
Country	US
Kind code	B2
Filing date	May 18, 2021
Priority date	Dec 3, 2019
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

An electrochemical device includes an electrolyte membrane, an anode disposed on a first main surface of the electrolyte membrane, a cathode disposed on a second main surface of the electrolyte membrane, an anode separator disposed on the anode, and a cathode separator disposed on the cathode. At least one of the anode separator or the cathode separator includes a metal substrate sheet and a conductive layer disposed on the metal substrate sheet and containing a metal oxide and a metal hydroxide.

First claim

What is claimed is:

1. An electrochemical device, comprising:
an electrolyte membrane;
an anode disposed on a first main surface of the electrolyte membrane;
a cathode disposed on a second main surface of the electrolyte membrane;
an anode separator disposed on the anode; and
a cathode separator disposed on the cathode,
wherein at least one of the anode separator or the cathode separator includes a metal substrate sheet, a sheet made of stainless steel, and a conductive layer disposed on the sheet made of stainless steel and containing a metal oxide and a metal hydroxide,
wherein the sheet made of stainless steel is integrated with the metal substrate sheet by diffusion bonding, and
wherein the sheet made of stainless steel has a thickness of 0.1 to 0.5 mm and the metal substrate sheet has a thickness of 1.5 to 2 mm.

2. The electrochemical device according to claim 1 , wherein the metal hydroxide is produced by introducing protons to a metal oxide-containing layer.

3. The electrochemical device according to claim 1 , wherein the metal oxide is chromium oxide, and the metal hydroxide is chromium hydroxide.

4. The electrochemical device according to claim 1 , wherein the metal substrate sheet is made of stainless steel.

5. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of SUS316 or SUS316L.

6. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of 4401-316-00-I or 4436-316-00-I.

7. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of 1.4401 or 1.4436.

8. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of S31600 or S31603.

9. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of S31608 or S31603.

10. The electrochemical device according to claim 1 , wherein the conductive layer has a thickness more than or equal to 0.001 μm and less than or equal to 5 μm.

11. The electrochemical device according to claim 1 , wherein the conductive layer contains at least one of fluorine at a fluorine concentration of 0.1 atom % or more or lithium at a lithium concentration of 0.01 atom % or more.

12. The electrochemical device according to claim 1 , further comprising an anode gas diffusion layer disposed on the conductive layer of the anode separator.

13. The electrochemical device according to claim 12 , wherein the conductive layer of the anode separator is disposed only in a region of the anode separator that is in contact with the anode gas diffusion layer.

14. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of 4404-316-03-I, 4432-316-03-1, or 4436-316-91-I.

15. The electrochemical device according to claim 4 , wherein the metal substrate sheet is made of 1.4404, 1.4432, or 1.4435.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Onuma Shigenori
• Kakuwa Takashi

Classifications

• H01M8/0228

  in the form of layered or coated products · CPC title

• H01M8/021

  Alloys based on iron · CPC title

• H01M8/0206 Primary

  Metals or alloys · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• Y02E60/50

  Fuel cells · CPC title