US4405699A
Expired / Lapsed
US
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Manganese dioxide electrode for lithium batteries
Assignee: VERTA BATTERIE AKTIENGESELLSCHAFT A CORP OF GERMANY
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Filing: 1982-03-24
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Granted: 1983-09-20
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Expires: 2002-03-24
Abstract
Abstract A positive electrode for Li/MnO2 batteries uses as its active material gamma -MnO2, which differs from the structurally similar electrolytic or synthetic manganese dioxide through the absence of water and from its dehydration product, which is beta -MnO2, through better electrochemical utilization capability. The modified gamma -MnO2 is obtained by reduction of electrolytic manganese dioxide by means of hydrazine into alpha -MnO(OH) and by oxidation of the latter through tempering in an oxygen stream at about 280 DEG C.
Inventors
- 👤 Franz J. Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/502; C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; C01P; C01P2006/00; C01P2006/40; H01M6/00; H01M6/14; H01M6/16; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
A positive manganese dioxide electrode for galvanic elements with negative lithium electrode, characterized in that the active electrode material is a γ-MnO 2 produced by oxidizing tempering of α-MnO(OH).
Claim 2
Dependent Claim
29 words
A positive manganese dioxide electrode for galvanic elements with negative lithium electrode, characterized in that the active electrode material is a γ-MnO 2 produced by oxidizing tempering of α-MnO(OH).
Claim 3
Dependent Claim
23 words
The positive manganese dioxide electrode of claim 1 wherein 5 to 10% by weight of graphite is mixed with the active electrode material.
Claim 4
Dependent Claim
24 words
The positive manganese dioxide electrode of claim 1 wherein 1 to 4% by weight of polytetrafluoroethylene powder is mixed with the active electrode material.
Claim 5
Dependent Claim
67 words
The method of manufacturing a positive manganese dioxide electrode according to claim 1 characterized in that the active electrode material is further oxidized into γ-MnO 2 through heat treatment of α-MnO(OH) in an oxygen stream, the oxidation product is mixed with 5 to 10% by weight of graphite and 1 to 4% by weight of polytetrafluoroethylene powder, and the mixture is formed into electrode shape through compression.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein the temperature during the oxidizing heat treatment is at 270° to 290° C.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein the temperature is approximately 280° C.
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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |