# US 4,399,005 A · Method of nickel electrode production

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- Number: US 4,399,005 A
- Document ID: US4399005A
- Status: Granted
- Kind: A
- Application number: 06/333,216
- Filed: 1981-12-21
- Granted: 1983-08-16
- Earliest claimed: 1981-12-21
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Inventors: David H. Fritts; John F. Leonard
- Web page: https://patentgrep.com/patent/US4399005A

## CPC

- H01M 4/30: Pressing
- H01M 4/29: by electrochemical methods
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A method for preparing nickel electrodes is provided in which zinc hydroxide is deposited onto a metal plaque simultaneously with nickel hydroxide. A nickel electrode so prepared exhibits improved dimensional stability.

## Claims

### Claim 1

A process for making a nickel electrode which comprises the steps of:
(a) immersing a porous, electrically conductive plaque in an electrolyte bath provided with a counter-electrode, said bath comprising an aqueous solution of nickel nitrate;
(b) forming the conductive plaque against the said counter-electrode at a desired current density;
(c) continuously adding, at a desired rate, an aqueous solution of zinc nitrate to said electrolyte bath; and
(d) continuing said forming step (b) and said addition step (c) for a time sufficient to convert the metal nitrates in the pores of said plaque to a desired level of the corresponding metal hydroxides.

### Claim 2 (depends on 1)

The process of claim 1 wherein said electrolyte bath comprises about 75 to about 150 grams of nickel per liter of solution.

### Claim 3 (depends on 2)

The process of claim 2 wherein said electrolyte bath initially comprises from about 2 to about 10 ppm of zinc nitrate.

### Claim 4 (depends on 1)

The process of claim 1 wherein said electrolyte bath is adjusted during said forming to maintain the pH in the range of 2 to 4.

### Claim 5 (depends on 1)

The process of claim 1 wherein said electrolyte bath is adjusted during said forming to maintain the pH in the range of 3.3 to 3.7.

### Claim 6 (depends on 1)

The process of claim 1 wherein said current density is in the approximate range of 0.2 to 0.6 ampere per square inch.

### Claim 7 (depends on 1)

The process of claim 1 wherein said electrolyte bath is maintained at a temperature in the approximate range of 70.degree. to 100.degree. C.