Cathode, membrane electrode assembly, and battery

Patent metadata

Field	Value
Publication number	US-11764366-B2
Application number	US-202217829878-A
Country	US
Kind code	B2
Filing date	Jun 1, 2022
Priority date	Nov 16, 2017
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A cathode of a battery including an electrolyte membrane, containing a first layer which contains 0.3 mg/cm2 or more and 9.0 mg/cm2 or less of a carbon catalyst; and a second layer which is arranged between the electrolyte membrane and the first layer in the battery, and which contains 0.002 mg/cm2 or more and 0.190 mg/cm2 or less of platinum. The carbon catalyst has a ratio of a mesopore volume to a total pore volume of 30% or more.

First claim

The invention claimed is:

1. A cathode of a battery including an electrolyte membrane, the cathode comprising:
a first layer which contains 0.3 mg/cm 2 or more and 9.0 mg/cm 2 or less of a carbon catalyst; and
a second layer which is arranged between the electrolyte membrane and the first layer in the battery, and which contains 0.002 mg/cm 2 or more and 0.190 mg/cm 2 or less of platinum,
wherein the carbon catalyst has a ratio of a mesopore volume to a total pore volume of 30% or more.

2. The cathode according to claim 1 , wherein the carbon catalyst has a content of iron of 0.01 wt % or more measured by inductively-coupled plasma mass spectrometry.

3. The cathode according to claim 1 , wherein the carbon catalyst exhibits a nitrogen atom content of 1.0 wt % or more measured by elemental analysis based on a combustion method.

4. The cathode according to claim 1 , wherein the carbon catalyst exhibits a ratio of a nitrogen atom content to a carbon atom content of 1.1% or more measured by elemental analysis based on a combustion method.

5. The cathode according to claim 1 , wherein the carbon catalyst contains iron and a metal other than the iron.

6. The cathode according to claim 1 , wherein the carbon catalyst has a specific surface area of 800 m 2 /g or more measured by a BET method.

7. The cathode according to claim 1 ,
wherein the first layer contains an electrolyte material, and
wherein the first layer has a ratio of a weight of the electrolyte material to a remaining weight, obtained by subtracting the weight of the electrolyte material from a weight of the first layer, of 0.30 or more.

8. The cathode according to claim 1 ,
wherein the second layer contains an electrolyte material, and
wherein the second layer has a ratio of a weight of the electrolyte material to a remaining weight, obtained by subtracting the weight of the electrolyte material from a weight of the second layer, of 0.05 or more.

9. The cathode according to claim 1 , wherein the cathode has a ratio of a content of the platinum in the second layer to a content of the carbon catalyst in the first layer of 20.00 wt % or less.

10. The cathode according to claim 1 , wherein the first layer and/or the second layer contains an electrolyte material having an EW value of 300 or more and 1,100 or less.

11. A membrane electrode assembly, comprising the cathode of claim 3 , an anode, and the electrolyte membrane arranged between the cathode and the anode.

12. A battery, comprising the cathode of claim 3 , or a membrane electrode assembly, comprising the cathode, an anode, and the electrolyte membrane arranged between the cathode and the anode.

13. A cathode of a battery including an electrolyte membrane, the cathode comprising:
a first layer which contains 0.3 mg/cm 2 or more and 9.0 mg/cm 2 or less of a carbon catalyst; and
a second layer which is arranged between the electrolyte membrane and the first layer in the battery, and which contains 0.002 mg/cm 2 or more and 0.190 mg/cm 2 or less of platinum,
wherein the carbon catalyst has a specific surface area of 1200 m 2 /g or more measured by a BET method.

14. The cathode according to claim 13 , wherein the carbon catalyst exhibits a nitrogen atom content of 1.0 wt % or more measured by elemental analysis based on a combustion method.

15. The cathode according to claim 13 , wherein the carbon catalyst exhibits a ratio of a nitrogen atom content to a carbon atom content of 1.1% or more measured by elemental analysis based on a combustion method.

16. The cathode according to claim 13 ,
wherein the first layer contains an electrolyte material, and
wherein the first layer has a ratio of a weight of the electrolyte material to a remaining weight, obtained by subtracting the weight of the electrolyte material from a weight of the first layer, of 0.30 or more.

17. The cathode according to claim 13 ,
wherein the second layer contains an electrolyte material, and
wherein the second layer has a ratio of a weight of the electrolyte material to a remaining weight, obtained by subtracting the weight of the electrolyte material from a weight of the second layer, of 0.05 or more.

18. The cathode according to claim 13 , wherein the cathode has a ratio of a content of the platinum in the second layer to a content of the carbon catalyst in the first layer of 20.00 wt % or less.

19. A membrane electrode assembly, comprising the cathode of claim 13 , an anode, and the electrolyte membrane arranged between the cathode and the anode.

20. A battery, comprising the cathode of claim 13 , or a membrane electrode assembly, comprising the cathode, an anode, and the electrolyte membrane arranged between the cathode and the anode.

Assignees

• Nisshinbo Holdings Inc

Inventors

• Kishimoto Takeaki
• Kobayashi Yoshikazu
• Fujii Chihiro
• Ye Siyu
• Banham Dustin William H

Classifications

• H01M4/92 Primary

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

• H01M4/8657 Primary

  layered · CPC title

• H01M4/8642 Primary

  Gradient in composition · CPC title

• H01M4/926 Primary

  on carbon or graphite · CPC title

• H01M8/122

  Corrugated, curved or wave-shaped MEA · CPC title