# US RE34,752 E · Alkaline battery with a nickel electrode

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- Number: US RE34,752 E
- Document ID: USRE34752E
- Status: Granted
- Kind: E
- Application number: 08/005,157
- Filed: 1993-01-15
- Granted: 1994-10-04
- Earliest claimed: 1988-07-19
- Assignees: Yuasa Corporation
- Inventors: Masahiko Oshitani; Heiichi Hasegawa; Hiroshi Yufu
- Web page: https://patentgrep.com/patent/USRE34752E

## Abstract

A nickel electrode for an alkaline battery comprises a porous alkaline-proof metal fiber substrate used as a current collector, and active material for the electrode. The active material includes nickel hydroxide powder active material, to which zinc or magnesium is added at a rate in a range of [3] 1 -10 wt % or 1-3 wt %, respectively. The zinc and magnesium is in a solid solution in crystal of the nickel hydroxide, and the active material forms principle compound of paste, which is loaded in the electrode.

## Claims

### Claim 1

Active material for a nickel electrode comprising:
nickel hydroxide powder active material; and
zinc or magnesium which is added to said active material at a rate in a range of .Badd.[3].Baddend. 1 -10 wt% or 1-3 wt%, respectively, said zinc and magnesium being in a solid solution in crystal of said nickel hydroxide, and in distribution of pore radii calculated from [the] a desorption side at nitrogen adsorption isotherm of said powder, development of pore having a radius of 30 .ANG. or more being prevented, and an entire pore volume rate being controlled at 0.05 ml/g or less.

### Claim 2 (depends on 1)

Active material as claimed in claim 1 wherein said active material powder, which includes nickel hydroxide and [a small amount of] said zinc or magnesium, is produced by deposition of sulfate solution thereof as starting material in aqueous solution having pH 11-13 controlled by caustic soda or caustic potash together with ammonium sulfate.

### Claim 3

A nickel electrode comprising;
a porous alkaline-proof metal fiber substrate used as a current collector; and
active material for the electrode;
said active material including;
nickel hydroxide powder active material, to which zinc or magnesium is added at a rate in a range of .Badd.[3].Baddend. 1 -10 wt% or 1-3 wt%, respectively, said zinc and magnesium being in a solid solution in crystal of said nickel hydroxide; and
said active material forming principle compound of paste, which is loaded in said electrode.

### Claim at position 4 (depends on 3)

[4. A nickel electrode as claimed in claim 3 wherein a small amount of cobalt in a solid solution exists in addition to said
zinc or magnesium.] 5. A nickel electrode as claimed in claim 3 wherein divalent cobalt compound, which forms cobalt complex ion when [dissolven] dissolved in alkaline aqueous solution, is
added to said active material powder at a rate in a range of 5-15 wt%. 6. A nickel electrode as claimed in claim [3] 5 wherein conductive additives are not included, and [the] conductivity between said [nickel] metal fiber substrate and particles of said active material is substantially maintained only by
virtue of said cobalt compound additive. 7. An alkaline battery assembled with a nickel electrode as recited in claim [2] 3 without formation, maintained under standing condition one or more days after supplying electrolyte therein, and initially charged after cobalt compound additive is completely dissolved and deposited.