US4017665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for a zinc electrode
Assignee: Prazska Akumulatorka Narodni Podnik
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Filing: 1975-05-21
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Granted: 1977-04-12
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Expires: 1995-05-21
Abstract
Abstract An improved active electrode composition for a zinc electrode of an electrochemical accumulator is provided with an ingredient that inhibits the passage of zinc into the alkaline electrolyte of the accumulator during the discharge process. The ingredient is preferably an alkaline fluoride, which during discharge forms with the zinc a compound which is only slightly soluble, if at all, in the electrolyte. The resulting prevention of the reversible movement of zinc into and out of the solution is effective to prevent an undesired shifting of active material on the collector of the electrode, and generally to increase its life.
Inventors
- 👤 Josef Sandera
- 👤 Milan Calabek
- 👤 Oldrich Kouril
- 👤 Miroslav Cenek
- 👤 Josef Vanacek
- 👤 Jiri Malik
- 👤 Vojtech Koudelka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:24
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/244; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
An improved composition for a zinc electrode, consisting of (a) a powdered material selected from the group consisting of zinc and zinc compounds, (b) a binding agent, (c) a porosity-increasing agent, and (d) a substance selected from the group consisting of sodium fluoride, potassium fluoride, and their mixtures, the substance being present in the composition in the range of 5-55% by weight.
Claim 2
Dependent Claim
62 words
An improved composition for a zinc electrode, consisting of (a) a powdered material selected from the group consisting of zinc and zinc compounds, (b) a binding agent, (c) a porosity-increasing agent, and (d) a substance selected from the group consisting of sodium fluoride, potassium fluoride, and their mixtures, the substance being present in the composition in the range of 5-55% by weight.
Claim 3
Dependent Claim
14 words
A composition as defined in claim 1, in which the powdered material is zinc.
Claim 4
Dependent Claim
14 words
A composition as defined in claim 1, in which said substance is sodium fluoride.
Claim 5
Dependent Claim
14 words
A composition as defined in claim 1, in which said substance is potassium fluoride.
Claim 6
Dependent Claim
40 words
An improved composition for a zinc electrode, consisting of (a) powdered zinc, (b) a binding agent, (c) a porosity-increasing agent, and (d) an alkaline fluoride, the alkaline fluoride being present in the composition in the range of 5-55% by weight.
Claim 7
Dependent Claim
40 words
An improved composition for a zinc electrode, consisting of (a) powdered zinc, (b) a binding agent, (c) a porosity-increasing agent, and (d) an alkaline fluoride, the alkaline fluoride being present in the composition in the range of 5-55% by weight.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |