US3870565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for the reduction of oxygen and a rechargeable cell comprising said cathode
Assignee: DONNET JEAN BAPTISTE
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Filing: 1974-06-14
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Granted: 1975-03-11
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Expires: 1994-06-14
Abstract
Abstract An electrochemical catalyst is placed on a support so as to constitute an air cathode for the reduction of oxygen which is primarily intended for use in a reversible or rechargeable fuel cell. The catalyst consists of finely-divided and non-porous carbon of the carbon black type constituted by a chain of substantially spherical particles and having a specific surface within the range of 50 to 600 m2/g, the carbon black having been subjected to a thermochemical treatment in a chlorine atmosphere at a temperature within the range of 1500* to 3000*C.
Inventors
- 👤 Maurice Bonnemay
- 👤 Guy Rene Bronoel
- 👤 Jean-Baptiste Donnet
- 👤 Jacques Lahaye
- 👤 Joel Alain Sarradin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:39
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; H01M12/00; H01M12/08; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A cathode for the reduction of oxygen and especially for a rechargeable cell, comprising a support on which is placed an electrochemical catalyst consisting of finely-divided carbon, wherein said carbon is of the non-porous carbon-black type constituted by a chain of substantially spherical particles and having a specific surface within the range of 50 to 600 m2/g, said carbon black having been subjected to a thermochemical treatment in a chlorine atmosphere at a temperature within the range of 1500* to 3000*C.
Claim 2
Dependent Claim
81 words
A cathode for the reduction of oxygen and especially for a rechargeable cell, comprising a support on which is placed an electrochemical catalyst consisting of finely-divided carbon, wherein said carbon is of the non-porous carbon-black type constituted by a chain of substantially spherical particles and having a specific surface within the range of 50 to 600 m2/g, said carbon black having been subjected to a thermochemical treatment in a chlorine atmosphere at a temperature within the range of 1500* to 3000*C.
Claim 3
Dependent Claim
56 words
A CATHODE FOR THE REDUCTION OF OXYGEN AND ESPECIALLY FOR A RECHARGEABLE CELL, COMPRISING A SUPPORT ON WHICH IS PLACED AN ELECTROCHEMICAL CATALYST CONSISTING OF FINELY-DIVIDED CARBON, WHEREIN SAID CARBON IS OF THE NON-POROUS CARBON-BLACK TYPE CONSTITUTED BY A CHAIN OF SUBSTANTIALLY SPERICAL PARTICLES AND HAVING A SPECIFIC SURFACE WITHIN THE RANGE OF 50 TO 600
Claim 4
Dependent Claim
56 words
A CATHODE FOR THE REDUCTION OF OXYGEN AND ESPECIALLY FOR A RECHARGEABLE CELL, COMPRISING A SUPPORT ON WHICH IS PLACED AN ELECTROCHEMICAL CATALYST CONSISTING OF FINELY-DIVIDED CARBON, WHEREIN SAID CARBON IS OF THE NON-POROUS CARBON-BLACK TYPE CONSTITUTED BY A CHAIN OF SUBSTANTIALLY SPERICAL PARTICLES AND HAVING A SPECIFIC SURFACE WITHIN THE RANGE OF 50 TO 600
Claim 5
Dependent Claim
48 words
A cathode for the reduction of oxygen according to claim 1, wherein the carbon black has a specific surface within the range of 120 to 250 m2/g, said carbon black having been subjected to a thermochemical treatment in a chlorine atmosphere at a temperature substantially equal to 1800*C.
Claim 6
Dependent Claim
68 words
A cathode for the reduction of oxygen according to claim 1, wherein the carbon black has a specific surface within the range of 120 to 250 m2/g, said carbon black having been subjected to a thermochemical treatment in a chlorine atmosphere at a temperature within the range of 1500*C to 2000*C associated with heating in an inert atmosphere at a temperature within the range of 2000*C and 3000*C.
Claim 7
Dependent Claim
61 words
A rechargeable cell comprising a cathode according to claim 1 and associated with an installation in which the electrolyte of the cell is circulated, wherein said installation comprises means for maintaining the electrolyte at low temperature and means for removing the organic products of degradation which are released by the carbon at the time of the charge cycle of the cell.
Claim 8
Dependent Claim
25 words
A rechargeable cell according to claim 4, wherein the means for maintaining the electrolyte at low temperature are constituted by a radiator having cooling fins.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |