US3977899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid electrolyte cell
Assignee: Seiko Instruments Inc
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Filing: 1974-12-09
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Granted: 1976-08-31
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Expires: 1994-12-09
Abstract
Abstract A solid electrolyte cell having beta -alumina as a solid electrolyte is disclosed. In this cell, positive active material and negative active material are opposed to each other with an intervening beta -alumina solid electrolyte layer therebetween. The utilization of the positive active material is increased in order to prolong the life of the heightened cell by mixing a conductive metal powder into the positive active material or by inserting an electrical conductor into the positive active material which is inert to the active material. The conductor is conductively connected to the electrode terminal of the cell.
Inventors
- 👤 Kazutoshi Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:31
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/185; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/5825; H01M4/62; H01M4/624; H01M4/625; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
An electrochemical cell comprising a pellet of positive-active material, negative-active material of amalgamated alkali metal or its alloy and a solid electrolyte of β alumina interposed therebetween, wherein said positive active materials comprises cupric sulfate penta hydrate, cupric sulfate trihydrate and said pellet has conductive current collector material consisting of graphite and a conductive metal which is inert wth respect to said positive active material disposed therein.
Claim 2
Dependent Claim
67 words
An electrochemical cell comprising a pellet of positive-active material, negative-active material of amalgamated alkali metal or its alloy and a solid electrolyte of β alumina interposed therebetween, wherein said positive active materials comprises cupric sulfate penta hydrate, cupric sulfate trihydrate and said pellet has conductive current collector material consisting of graphite and a conductive metal which is inert wth respect to said positive active material disposed therein.
Claim 3
Dependent Claim
15 words
The cell according to claim 1, wherein said conductive current collector is a metal powder.
Claim 4
Dependent Claim
23 words
The cell according to claim 1, wherein the current collector material is stainless steel metal continuously connected electrically with the positive electrode terminal.
Claim 5
Dependent Claim
26 words
The cell to claim 1, wherein said metal is connected material in the form of filaments, screens, wires, turnings, chips and other subdivided elongated metallic particles.
Claim 6
Dependent Claim
26 words
The cell according to claim 1 wherein the weight ratios of each composition comprising said cupric sulfate pentahydrate, cupric sulfate trihydrate and the graphite is 10:10:2.
Claim 7
Dependent Claim
27 words
The cell according to claim 3, wherein a stainless steel current collector is also provided in said negative-active (anodic) material and is conductively connected to its terminal.
References Cited (Backward Citations)
US3817790A
Cited
US3849200A
Cited
US3793080A
Cited
US3762955A
Cited
US3826685A
Cited
US3770502A
Cited
US3824130A
Cited
US3909296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |