US3657013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemically active material, consisting chiefly of nickel hydroxide, for positive electrodes in alkaline accumulators, and procedure for its manufacture
Assignee: Svenska Ackumulator Jungner AB
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Filing: 1970-02-26
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Granted: 1972-04-18
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Expires: 1990-02-26
Abstract
Abstract Electrochemically active material consisting essentially of nickel hydroxide for use as a positive electrode in alkaline accumulators, the electrochemically active material containing from 0.05 to 5.0 percent by weight, based on the weight of the nickel hydroxide, of a sulfate of at least one metal selected from the group consisting of barium, strontium, mercury and antimony, the electrochemically active material being substantially free of residual alkali metal sulfate, and a process for producing the same are disclosed.
Inventors
- 👤 Ake Lennart Melin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/52; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
The electrochemically active material of claim 1 wherein said metal sulphate is rigidly fixed in the crystal lattice of the nickel hydroxide active material.
Claim 2
Dependent Claim
32 words
The electrochemically active material of claim 2 wherein said electrochemically active material contains from 0.25 to 0.50 percent by weight, based on the weight of said nickel hydroxide, of said metal sulphate.
Claim 3
Dependent Claim
157 words
In a method for the production of an electrochemically active material consisting essentially of nickel hydroxide for use as a positive electrode in alkaline accumulators, said method comprising precipitating nickel hydroxide from a nickel salt solution containing at least nickel sulphate with the aid of an alkali metal hydroxide solution, whereby a precipitate is formed which contains nickel hydroxide and residual alkali metal sulphate, washing said precipitate and drying said precipitate, the improvement which consists essentially of adding to said nickel hydroxide, before said drying step, a compound of a metal selected from the group consisting of barium, strontium, mercury and antimony, said metal forming a difficulty soluble metal sulphate, said compound of said metal being added in a sufficient amount to provide from 0.05 to 5.0 weight percent, based on the weight of said nickel hydroxide, of said metal sulphate in said nickel hydroxide, wherein said nickel hydroxide is substantially free of residual alkali metal sulphate.
Claim 4
Dependent Claim
21 words
The method of claim 4 wherein said compound of said metal is added to said nickel hydroxide after said washing step.
Claim 5
Dependent Claim
15 words
The method of claim 5 wherein said compound of said metal is a metal hyDroxide.
Claim 6
Dependent Claim
46 words
The method of claim 4 wherein said compound of said metal is added to said nickel hydroxide in a sufficient amount to provide from 0.25 to 0.50 percent by weight, based on the weight of said nickel hydroxide, of said metal sulphate in said nickel hydroxide.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |