US3986892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous cobalt electrodes for alkaline accumulators and hybrid cell therewith and air electrode
Assignee: Individual
•
Filing: 1973-12-10
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Granted: 1976-10-19
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Expires: 1993-12-10
Abstract
Abstract A porous, preferably negative, electrode for alkaline accumulators, characterized by the fact that its electro-chemically active inner surface amounts to between 1 and 20 sp.m. per gram for a volume porosity of between 30 and 85% and that its pore interval ranges between 0.15 and 1.0 μm.
Inventors
- 👤 Henning H. Ewe
- 👤 Eduard W. Justi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:40
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M2004/026; H01M2004/027; H01M4/04; H01M4/043; H01M4/0471; H01M4/64; H01M4/66; H01M4/661; H01M4/70; H01M4/76; H01M4/762; H01M50/00; H01M50/40; H01M50/46; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063; Y10T428/12097; Y10T428/12493; Y10T428/12771; Y10T428/12861
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
A porous negative cobalt electrode for alkaline accumulators, characterized by the fact that its electro-chemically active inner surface amounts to between 1 and 20 sq.m. per gram with a volume porosity of between 30 and 85% and that its pore interval ranges between 0.15 and 1.0 μm.
Claim 2
Dependent Claim
47 words
A porous negative cobalt electrode for alkaline accumulators, characterized by the fact that its electro-chemically active inner surface amounts to between 1 and 20 sq.m. per gram with a volume porosity of between 30 and 85% and that its pore interval ranges between 0.15 and 1.0 μm.
Claim 3
Dependent Claim
36 words
The porous negative electrode in accordance with claim 1, wherein said pore interval ranges from between two times and about three times the maximum thickness of the cobalt hydroxide layer produced during discharge of the electrode.
Claim 4
Dependent Claim
21 words
The porous negative electrode in accordance with claim 2, wherein said maximum thickness comprises about 500 molecular layers of cobalt hydroxide.
Claim 5
Dependent Claim
79 words
A porous negative cobalt electrode for alkaline accumulators, characterized by the fact that its electro-chemically active inner surface amounts to between 1 and 20 sq.m. per gram with a volume porosity of between 30 and 85%, that its pore interval ranges between 0.15 and 1.0 μm and that it is built up of cobalt granules which have been obtained by the reduction of highly dispersed low-alkali cobalt oxides in a stream of hydrogen at between 500° and 700° C.
Claim 6
Dependent Claim
79 words
A porous negative cobalt electrode for alkaline accumulators, characterized by the fact that its electro-chemically active inner surface amounts to between 1 and 20 sq.m. per gram with a volume porosity of between 30 and 85%, that its pore interval ranges between 0.15 and 1.0 μm and that it is built up of cobalt granules which have been obtained by the reduction of highly dispersed low-alkali cobalt oxides in a stream of hydrogen at between 500° and 700° C.
Claim 7
Dependent Claim
40 words
The porous negative electrode in accordance with claim 4, characterised by the fact that the cobalt powder according to the invention is contained without the addition of conducting substance in perforated tubes or boxes made of nickel plated sheet steel.
Claim 8
Dependent Claim
25 words
The porous negative electrode in accordance with claim 4, characterised by the fact that it comprises cobalt powder which is compacted without frame or stays.
Claim 9
Dependent Claim
31 words
The porous negative electrode in accordance with claim 6, characterised by the fact that it contains in its interior a nickel gauze or mesh which is connected with a current discharge.
Claim 10
Dependent Claim
29 words
Alkaline accumulator comprising one or more negative electrodes in accordance with claim 4 and one or more positive electrodes of the nickel hydroxide type combined with said negative electrodes.
Claim 11
Dependent Claim
54 words
Alkaline hybrid battery comprising as negative accumulator electrode, an electrode according to claim 4 a separator of thin porous plastic foil encasing said negative electrode, as positive discharge electrode, two air-breathing cathodes and as positive charging electrodes, two nickel gauzes, said gauzes being arranged between the negative storage electrode and the positive discharge electrode.
Claim 12
Dependent Claim
25 words
The porous negative electrode in accordance with claim 4, wherein said electro-chemically active inner surface area is between about 1 and 10 m 2 /g.
Claim 13
Dependent Claim
49 words
A method for fabricating the porous negative electrode of claim 1, comprising the steps of reducing a highly-dispersed low-alkali cobalt oxide in a stream of hydrogen at a temperature between 500° and 700° C., whereby cobalt is produced and shaping said cobalt into a configuration suitable for said electrode.
References Cited (Backward Citations)
US882144A
Cited
US2646455A
Cited
US2969413A
Cited
US2860175A
Cited
US3230113A
Cited
US3341446A
Cited
US3288641A
Cited
US3311505A
Cited
US3479226A
Cited
US3532548A
Cited
US3418171A
Cited
DE1803121A1
Cited
DE2018635A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |