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Patent US4022953A successfully refreshed from Google Patents.
US4022953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc electrodes for secondary batteries
Assignee: Fuelcell Energy Inc
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Filing: 1975-08-22
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Granted: 1977-05-10
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Expires: 1995-08-22
Abstract
Abstract Electrodes containing zinc active material include a cadmium additive enhancing adherence of the electrode for zinc electroreduced from the solid zinc compound state or deposited thereon from electrolytes. Zinc alkaline batteries employing such electrodes exhibit extended discharge-recharge cycling capacity.
Inventors
- 👤 Allen Charkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:36
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/244; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
Zinc electrode structure comprising an electrically conductive support and zinc active material and including cadmium particulate matter dispersed in said zinc active material, said cadmium particulate matter being selected from the group consisting of (a) metallic cadmium having particle size of not greater than 10 microns and surface area not less than 1.0 square meters per gram, (b) a cadmium compound electrochemically convertible to metallic cadmium having particle size of not greater than 10 microns and surface area not less than 1.0 square meters per gram and (c) mixtures of said metallic cadmium and said cadmium compound, the weight of said cadmium particulate matter being from 1.0 to 10% of the weight of said zinc active material.
Claim 2
Dependent Claim
117 words
Zinc electrode structure comprising an electrically conductive support and zinc active material and including cadmium particulate matter dispersed in said zinc active material, said cadmium particulate matter being selected from the group consisting of (a) metallic cadmium having particle size of not greater than 10 microns and surface area not less than 1.0 square meters per gram, (b) a cadmium compound electrochemically convertible to metallic cadmium having particle size of not greater than 10 microns and surface area not less than 1.0 square meters per gram and (c) mixtures of said metallic cadmium and said cadmium compound, the weight of said cadmium particulate matter being from 1.0 to 10% of the weight of said zinc active material.
Claim 3
Dependent Claim
15 words
The electrode structure claimed in claim 1 wherein said particulate cadmium matter is cadmium oxide.
Claim 4
Dependent Claim
15 words
The electrode structure claimed in claim 1 wherein said particulate cadmium matter is cadmium hydroxide.
Claim 5
Dependent Claim
51 words
The electrode structure claimed in claim 1 having a first layer overlying siad conductive suppport an comprised of said cadmium particulate matter and a first binder therefor and a second layer overlying said first layer and comprised of said zinc active material, said cadmium particulate matter and a second binder therefor.
Claim 6
Dependent Claim
15 words
The electrode structure claimed in claim 1 wherein said particulate cadmium matter is cadmium sulfate.
Claim 7
Dependent Claim
15 words
The electrode structure claimed in claim 2 wherein said zinc active material is zinc oxide.
Claim 8
Dependent Claim
19 words
The electrode structure claimed in claim 6 further including a binder for siad cadmium oxide and said zinc oxide.
Claim 9
Dependent Claim
12 words
The electrode structure claimed in claim 7 wherein said binder comprises polytetrafluorethylene.
Claim 10
Dependent Claim
15 words
The electrode structure claimed in claim 4 wherein said particulate cadmium matter is cadmium oxide.
Claim 11
Dependent Claim
15 words
The electrode structure claimed in claim 4 wherein said particulate cadmium matter is cadmium hydroxide.
Claim 12
Dependent Claim
15 words
The elcetrode structure claimed in claim 4 wherein said particulate cadmium matter is cadmium sulfate.
Claim 13
Dependent Claim
15 words
The electrode structure claimed in claim 9 wherein said zinc material is zinc active oxide.
Claim 14
Dependent Claim
15 words
The electrode structure claimed in claim 12 wherein said first and second binders comprise polytetrafluoroethylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |