US4357215A
Expired / Lapsed
US
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Fast ion conductors
Assignee: Ricardo AEA Ltd
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Filing: 1981-04-30
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Granted: 1982-11-02
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Expires: 2001-04-30
Abstract
Abstract There is interest in the use of solid-solution electrodes as a way of meeting the problems of conventional batteries; Li a TiS 2 where O≦a≦1 is known in this respect and may be made by high temperature preparative routes. Fast ion conductors of the formula A x M y O 2 where A is Li, Na or K, M is a transition metal e.g. Co or Ni, ≦x<1 and y≈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 A x' M y O 2 where O<x'≦1, carried out at low temperature.
Inventors
- 👤 John B. Goodenough
- 👤 Koichi Mizushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:34
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: 4
Claim 1
Independent Claim
92 words
A method of making 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, wherein M is a transition metal, wherein x is less than 1; and wherein y is approximately equal to 1 which method comprises extracting A + cations from a compound having the formula A x' M y O 2 wherein A, M, and y are as defined hereinbefore and wherein x' is less than or equal to 1.
Claim 2
Independent Claim
92 words
A method of making 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, wherein M is a transition metal, wherein x is less than 1; and wherein y is approximately equal to 1 which method comprises extracting A + cations from a compound having the formula A x' M y O 2 wherein A, M, and y are as defined hereinbefore and wherein x' is less than or equal to 1.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the A + cations are extracted electrochemically.
Claim 4
Dependent Claim
35 words
A method according to claim 2, wherein the electrochemical extraction is carried out by charging a cell represented as A/electrolyte/A x' M y O 2 towards a cell represented as A/electrolyte/M y O 2 .
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |