Catalyst for air electrode, air electrode including catalyst for air electrode, and air secondary battery including air electrode

Patent metadata

Field	Value
Publication number	US-11811069-B2
Application number	US-202217660194-A
Country	US
Kind code	B2
Filing date	Apr 21, 2022
Priority date	May 7, 2021
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A battery includes: an electrode group including an air electrode and a negative electrode that are stacked with a separator interposed therebetween; and a container housing the electrode group together with an alkaline electrolyte liquid. The air electrode includes a catalyst for an air electrode. This catalyst for an air electrode is a catalyst for an air electrode including an oxide containing at least bismuth (Bi), ruthenium (Ru), sodium (Na), and oxygen, and Na/(Ru+Bi+Na) representing an atomic ratio of the sodium to a sum of the bismuth, the ruthenium, and the sodium is 0.126 or more and 0.145 or less.

First claim

What is claimed is:

1. A catalyst for an air electrode, comprising an oxide containing at least bismuth (Bi), ruthenium (Ru), sodium (Na), and oxygen, wherein Na/(Ru+Bi+Na) representing an atomic ratio of the sodium to a sum of the bismuth, the ruthenium, and the sodium is 0.126 or more and 0.145 or less, and wherein Bi/Ru representing an atomic ratio of the bismuth to the ruthenium is 0.780 or more and 0.815 or less.

2. An air electrode, comprising:
a substrate for an air electrode; and
an air electrode mixture supported on the substrate for an air electrode,
wherein the air electrode mixture includes the catalyst for an air electrode according to claim 1 .

3. An air secondary battery, comprising:
a container;
an electrode group disposed in the container; and
an alkaline electrolyte liquid injected into the container,
wherein:
the electrode group includes an air electrode and a negative electrode that are stacked with a separator interposed therebetween, and
the air electrode is the air electrode according to claim 2 .

4. The air secondary battery according to claim 3 , wherein:
the negative electrode includes a hydrogen-storage alloy.

Assignees

• Fdk Corp

Inventors

• Inoue Minori
• Kajiwara Takeshi
• Unoki Shohei
• Endo Takahiro
• Yasuoka Shigekazu
• Watanabe Yoshikatsu

Classifications

• H01M4/8615 Primary

  Bifunctional electrodes for rechargeable cells · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• H01M4/9075

  Catalytic material supported on carriers, e.g. powder carriers (H01M4/8807, H01M4/881, H01M4/8814, H01M4/925 take precedence) · CPC title

• H01M10/26

  Selection of materials as electrolytes · CPC title

• H01M2004/027

  Negative electrodes · CPC title