US4844948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing nickel hydroxide electrode for alkaline storage cell
Assignee: Sanyo Electric Co Ltd
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Filing: 1988-03-01
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Granted: 1989-07-04
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Expires: 2008-03-01
Abstract
Abstract A method of manufacturing a nickel hydroxide electrode for use in an alkaline storage cell. The disclosed method comprises a first step of forming cobalt hydroxide on surfaces of a porous nickel sintered plaque, a second step of changing the cobalt hydroxide into cobalt oxyhydroxide, and a third step of carrying out an active material filling operation for the sintering plaque formed with the cobalt oxyhydroxide.
Inventors
- 👤 Shinsuke Nakahori
- 👤 Hironori Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:44
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/26; H01M4/28; H01M4/32; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
98 words
A method of manufacturing a nickel hydroxide electrode for use in an alkaline storage cell, comprising: a first step of forming cobalt hydroxide on the surface of a porous nickel sintered plaque by impregnating the sintered plaque with a cobalt salt and then immersing the sintered plaque in an alkali solution, a second step of heat-treating the sintered plaque having the cobalt hydroxide formed on its surface in presence of an alkali solution and oxygen, and a third step of carrying out an active material filling operation for impregnating the heat-treated sintered plaque with an acidic nickel salt.
Claim 2
Independent Claim
98 words
A method of manufacturing a nickel hydroxide electrode for use in an alkaline storage cell, comprising: a first step of forming cobalt hydroxide on the surface of a porous nickel sintered plaque by impregnating the sintered plaque with a cobalt salt and then immersing the sintered plaque in an alkali solution, a second step of heat-treating the sintered plaque having the cobalt hydroxide formed on its surface in presence of an alkali solution and oxygen, and a third step of carrying out an active material filling operation for impregnating the heat-treated sintered plaque with an acidic nickel salt.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, wherein the porous nickel sintered plaque used in the first step is sintered in a reducing atmosphere.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, wherein the sintered plaque is heated while immersed in the alkali solution.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 1, wherein the heat treatment in the second step is effected at a temperature of at least 50° C.
Claim 6
Dependent Claim
24 words
A method as claimed in claim 1, wherein the heat treatment in the second step is effected at a temperature not exceeding 250° C.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 1, wherein the heat treatment in the second step is effected in the air at a temperature of 90° C. and a humidity of 80%.
Claim 8
Dependent Claim
42 words
A method as claimed in claim 1, wherein the active material filling operation in the third step is carried out by impregnating the porous nickel sintered plaque with the acidic nickel salt and thereafter subjecting the sintered plaque to an alkali treatment.
Claim 9
Dependent Claim
44 words
A method as claimed in claim 1, wherein the active material filling operation in the third step is carried out by immersing the sintered plaque in a heated aqueous solution of nickel nitrate and thereafter immersing the sintered plaque in a caustic soda solution.
Claim 10
Independent Claim
100 words
A method of manufacturing a nickel hydroxide electrode for use in an alkaline storage cell, comprising a first step of forming cobalt hydroxide on the surface of a porous nickel sintered plaque by impregnating the sintered plaque with a cobalt salt and immersing the sintered plaque in an alkali solution, a second step of changing the cobalt hydroxide formed on the surface of the sintered plaque into cobalt oxyhydroxide or cobalt oxyhydroxide and cobaltosic oxide having a reduced crystallinity, and a third step of carrying out an active material filling operation for the sintered plaque formed with the cobalt oxyhydroxide.
Claim 11
Independent Claim
100 words
A method of manufacturing a nickel hydroxide electrode for use in an alkaline storage cell, comprising a first step of forming cobalt hydroxide on the surface of a porous nickel sintered plaque by impregnating the sintered plaque with a cobalt salt and immersing the sintered plaque in an alkali solution, a second step of changing the cobalt hydroxide formed on the surface of the sintered plaque into cobalt oxyhydroxide or cobalt oxyhydroxide and cobaltosic oxide having a reduced crystallinity, and a third step of carrying out an active material filling operation for the sintered plaque formed with the cobalt oxyhydroxide.
Claim 12
Dependent Claim
24 words
A method as claimed in claim 9, wherein the porous nickel sintered plaque used in the first step is sintered in a reducing atmosphere.
Claim 13
Dependent Claim
19 words
A method as claimed in claim 9, wherein the sintered plaque is heated while immersed in the alkali solution.
Claim 14
Dependent Claim
35 words
A method as claimed in claim 9, wherein the cobalt oxyhydroxide is formed in the second step by effecting a heat treatment without removing alkali solution from the sintered plaque prepared in the first step.
Claim 15
Dependent Claim
25 words
A method as claimed in claim 12, wherein the heat treatment in the second step is effected at a temperature of at least 50° C.
Claim 16
Dependent Claim
24 words
A method as claimed in claim 12, wherein the heat treatment in the second step is effected at a temperature not exceeding 250° C.
Claim 17
Dependent Claim
41 words
A method as claimed in claim 9, wherein the active material filling operation in the third step is carried out by impregnating the porous nickel sintered with the acidic nickel salt and thereafter subjecting the sintered plaque to an alkali treatment.
Claim 18
Dependent Claim
44 words
A method as claimed in claim 9, wherein the active material filling operation in the third step is carried out by immersing the sintered plaque in a heated aqueous solution of nickel nitrate and thereafter immersing the sintered plaque in a caustic soda solution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |