# US 5,707,761 A · Nickel positive electrode and alkaline storage battery using the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,707,761 A
- Document ID: US5707761A
- Status: Granted
- Kind: A
- Application number: 08/732,186
- Filed: 1996-10-17
- Granted: 1998-01-13
- Earliest claimed: 1995-10-24
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Kiyoshi Hayashi; Katsuyuki Tomioka; Nobuyasu Morishita; Munehisa Ikoma
- Web page: https://patentgrep.com/patent/US5707761A

## CPC

- H01M 10/288: {Processes for forming or storing electrodes in the battery container}
- H01M 4/32: Nickel oxide or hydroxide electrodes
- H01M 4/52: of nickel, cobalt or iron
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/30: Nickel accumulators (H01M10/34 takes precedence)
- H01M 10/345: {Gastight metal hydride accumulators}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

An improved non-sintered type nickel positive electrode comprising a nickel hydroxide powder as an active material and a cobalt hydroxide powder for improving the utilization of the active material, and an alkaline storage battery configured with the positive electrode are disclosed. In the non-sintered type nickel positive electrode, at least part of the surfaces of the particles of the cobalt hydroxide powder is covered with a stabilizing agent of at least one member selected from the group consisting of a higher carboxylic acid, an ester of carboxylic acid, an aldehyde, a phenol and a vitamin.

## Claims

### Claim 1

A non-sintered positive electrode comprising a nickel hydroxide powder and a cobalt hydroxide powder, wherein at least part of surfaces of the particles of said cobalt hydroxide powder is covered with a stabilizing agent of at least one member selected from the group consisting of citric acid, tartaric acid, lactic acid, glutamic acid, an ester of carboxylic acid, an aldehyde, a phenol and a vitamin.

### Claim 2 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, wherein said ester of carboxylic acid is isoamyl acetate or methyl anthranilate.

### Claim 3 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, wherein said aldehyde is formaldehyde or citral.

### Claim 4 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, wherein said phenol is .beta.-naphthol or tocopherol.

### Claim 5 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, wherein said vitamin is vitamin C or vitamin E.

### Claim 6 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, wherein said cobalt hydroxide powder has a specific surface area of 10 m.sup.2 /g or larger and a particle diameter of 1/2 or less of that of said nickel hydroxide powder.

### Claim 7 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, wherein an amount of said stabilizing agent is 0.01-10 mg per 1 g of said cobalt hydroxide.

### Claim 8 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, further comprising at least one member selected from the group consisting of a metallic nickel powder, a carbon powder, a metallic cobalt powder and a cobalt monoxide powder.

### Claim 9 (depends on 1)

The non-sintered positive electrode in accordance with claim 1, further comprising at least one member selected from the group consisting of a zinc oxide powder, a cadmium oxide powder, a metallic zinc powder and a metallic cadmium powder.

### Claim 10 (depends on 1)

A sealed alkaline storage battery comprising the non-sintered positive electrode in accordance with claim 1, a negative electrode configured with a hydrogen storage alloy and an alkaline electrolyte.

### Claim 11

A sealed alkaline storage batter comprising:
a non-sintered positive electrode configured with a nickel hydroxide powder and a cobalt hydroxide powder, wherein at least part of the surfaces of the particles of said cobalt hydroxide powder is covered with a stabilizing agent of at least one member selected from the group consisting of citric acid, isoamyl acetate, citral, .beta.-naphthol and vitamin C; a negative electrode configured with a hydrogen storage alloy; and an alkaline electrolyte.