US4547440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cell
Assignee: AEA TECHNOLOGY BATTERY SYSTEMS Ltd
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Filing: 1984-04-18
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Granted: 1985-10-15
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Expires: 2004-04-18
Abstract
Abstract A solid state electrochemical cell comprises an anode having lithium as its active material, a polymeric electrolyte, and a cathode comprising a composite of an insertion electrode material or similarly active material and a polymeric material. One of the electrolyte and the cathode possesses an ionically conducting phase at ambient temperature and the other of the electrolyte and the cathode lacks such a phase. Ionic conductivity can be induced in said other of the electrolyte and cathode at elevated temperature thereby to render the cell operable and give rise to improvements in comparison with cells where such phases are present ab initio.
Inventors
- 👤 Alan Hooper
- 👤 John M. North
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/181; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A solid state electrochemical cell comprising an anode having lithium as its active material, an electrolyte comprising a polymeric material capable of forming a complex with a lithium salt, and a cathode comprising a composite of an insertion electrode material and said polymeric material, where, in one of the electrolyte and the cathode, a lithium salt is present as a complex with said polymeric material to constitute an ionically conducting phase and, in the other of the electrolyte and the cathode, such an ionically conducting phase is absent, and wherein ionic conductivity can be induced in said other of the electrolyte and the cathode at elevated temperature thereby to render the cell operable.
Claim 2
Dependent Claim
113 words
A solid state electrochemical cell comprising an anode having lithium as its active material, an electrolyte comprising a polymeric material capable of forming a complex with a lithium salt, and a cathode comprising a composite of an insertion electrode material and said polymeric material, where, in one of the electrolyte and the cathode, a lithium salt is present as a complex with said polymeric material to constitute an ionically conducting phase and, in the other of the electrolyte and the cathode, such an ionically conducting phase is absent, and wherein ionic conductivity can be induced in said other of the electrolyte and the cathode at elevated temperature thereby to render the cell operable.
Claim 3
Independent Claim
126 words
A method of making an operable solid state electrochemical cell comprising (i) assembling in the form of a cell an anode having lithium as its active material, an electrolyte comprising a polymeric material capable of forming a complex with a lithium salt, and a cathode comprising a composite of an insertion electrode material in combination with said polymeric material, wherein, in one of the electrolyte and the cathode, a lithium salt is present as a complex with said polymeric material to constitute an ionically conducting phase and, in the other of the electrolyte and the cathode, such an ionically conducting phase is absent, and (ii) heating the cell to an elevated temperature thereby to induce ionic conductivity in said other of the electrolyte and the cathode.
Claim 4
Independent Claim
126 words
A method of making an operable solid state electrochemical cell comprising (i) assembling in the form of a cell an anode having lithium as its active material, an electrolyte comprising a polymeric material capable of forming a complex with a lithium salt, and a cathode comprising a composite of an insertion electrode material in combination with said polymeric material, wherein, in one of the electrolyte and the cathode, a lithium salt is present as a complex with said polymeric material to constitute an ionically conducting phase and, in the other of the electrolyte and the cathode, such an ionically conducting phase is absent, and (ii) heating the cell to an elevated temperature thereby to induce ionic conductivity in said other of the electrolyte and the cathode.
Claim 5
Dependent Claim
21 words
A method as claimed in claim 2 wherein the elevated temperature is within the range of 80° C. to 140° C.
Claim 6
Dependent Claim
64 words
A method as claimed in claim 3 wherein the cathode is prepared by coating a film from a dispersion of the insertion electrode material in a solution of the polymeric material in a solvent therefor, followed by removing the solvent, a lithium salt being absent from said solution and a lithium salt being present as a complex with the polymeric material in the electrolyte.
References Cited (Backward Citations)
US4060673A
Cited
US3704174A
Cited
US4143213A
Cited
US4143214A
Cited
US4303748A
Cited
US4365009A
Cited
US4436796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |