US4302518A
Expired / Lapsed
US
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Electrochemical cell with new fast ion conductors
Assignee: Ricardo AEA Ltd
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Filing: 1980-03-31
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Granted: 1981-11-24
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Expires: 2000-03-31
Abstract
Abstract There is interest in the use of solid-solution electrodes as a way of meeting the problems of conventional batteries; LiaTiS2 where O<a<1 is known in this respect and may be made by high temperature preparative routes. Fast ion conductors of the formula AxMyO2 where A is Li, Na or K, M is a transition metal e.g. Co or Ni, <x<1 and y APPROX 1 have been made for this purpose according to the invention. They cannot be made by high temperature routes when x is substantially less than 1 owing to stability problems. In the invention, they have been made by electrochemical extraction of A+ions from compounds of the formula Ax'MyO2 where O<x'<1, carried out at low temperature.
Inventors
- 👤 John B. Goodenough
- 👤 Koichi Mizuchima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01B; H01B1/00; H01B1/06; H01B1/08; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/52; H01M4/525; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
An ion conductor, of the formula A x M y O 2 and having the layers of the α-NaCrO 2 structure, in which formula A is Li, Na or K; M is a transition metal; x is less than 1 and y is approximately equal to 1, the A + cation vacancies in the ion conductor having been created by A + cation extraction.
Claim 2
Dependent Claim
64 words
An ion conductor, of the formula A x M y O 2 and having the layers of the α-NaCrO 2 structure, in which formula A is Li, Na or K; M is a transition metal; x is less than 1 and y is approximately equal to 1, the A + cation vacancies in the ion conductor having been created by A + cation extraction.
Claim 3
Dependent Claim
24 words
An ion conductor according to claim 1, wherein A is Li and M is a transition metal of atomic number from 23 to 28.
Claim 4
Dependent Claim
13 words
An ion conductor according to claim 2, wherein M is Co or Ni.
Claim 5
Dependent Claim
41 words
An ion conductor of the formula Li x M y O 2 and having the layers of the α-NaCrO 2 structure, in which formula x is 0.8 or less, y is approximately equal to 1 and M is Co or Ni.
Claim 6
Dependent Claim
41 words
An ion conductor of the formula Li x M y O 2 and having the layers of the α-NaCrO 2 structure, in which formula x is 0.8 or less, y is approximately equal to 1 and M is Co or Ni.
Claim 7
Dependent Claim
13 words
An ion conductor according to claim 4, wherein lies between 0.067 and 0.8.
Claim 8
Dependent Claim
44 words
In an electrochemical cell comprising a liquid or solid electrolyte arranged between solid-solution electrodes, the improvement wherein at least one of the solid-solution electrodes is constituted by an ion conductor of the formula A x M y O 2 as defined in claim 1.
Claim 9
Dependent Claim
45 words
An electrochemical cell according to claim 6 wherein the ion conductor of the formula A x M y O 2 constitutes the cathode and a compound of the formula Li a TiS 2 where a is less than or equal to 1 constitutes the anode.
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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |