US4822701A
Expired / Lapsed
US
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Solid electrolytes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1987-09-11
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Granted: 1989-04-18
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Expires: 2007-09-11
Abstract
Abstract AN electrochemical cell which comprises a conductive anode and cathode capable of mutual electrochemical reaction and separated by a solid electrolyte comprising: (a) a matrix of sheets of atoms, having side-chains linked to the sheets, which side chains comprise polar groups free from active hydrogen atoms, (b) a polar aprotic liquid dispersed in the matrix, and (c) a highly ionized ammonium or alkali metal salt dissolved in the matrix and/or liquid, a cathode therefor, the electrolyte per se, and processes for the preparation of the electrolyte and the cathode.
Inventors
- 👤 Dennis G H Ballard
- 👤 Philip Cheshire
- 👤 Josef E. Przeworski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:59
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025; H01G9/145; H01M; H01M10/00; H01M10/05; H01M10/052; H01M10/056; H01M10/0564; H01M10/0565; H01M6/00; H01M6/14; H01M6/18; H01M6/181; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A solid electrolyte for an electrochemical cell, which comprises: (a) a matrix of cross-linked polymer chains, having side chains linked thereto, which side chains comprise polar groups free from active hydrogen atoms, (b) a polar aprotic liquid dispersed in the matrix, and (c) an ionised monomeric ammonium or alkali metal or alkaline earth metal salt dissolved in the matrix and/or liquid.
Claim 2
Dependent Claim
61 words
A solid electrolyte for an electrochemical cell, which comprises: (a) a matrix of cross-linked polymer chains, having side chains linked thereto, which side chains comprise polar groups free from active hydrogen atoms, (b) a polar aprotic liquid dispersed in the matrix, and (c) an ionised monomeric ammonium or alkali metal or alkaline earth metal salt dissolved in the matrix and/or liquid.
Claim 3
Dependent Claim
31 words
A solid electrolyte according to claim 1 wherein the aprotic polar liquid is one with a dielectric constant of at least 50 and/or a dipole moment of at least 3 Debye.
Claim 4
Dependent Claim
32 words
A solid electrolyte according to claim 2 wherein the aprotic polar liquid is ethylene or propylene carbonate, a dialkylformamide or -sulphoxide, a cyclic ether, sulpholane or a bis(polyalkoxyalkyl)carbonate, or a cyclic amide.
Claim 5
Dependent Claim
30 words
A solid electrolyte according to claim 1, wherein the liquid is present in the matrix at 35 to 200 parts by weight per 100 parts by weight of the matrix.
Claim 6
Dependent Claim
45 words
A process for preparing a solid electrolyte according to claim 1 in any feasible order: (a) forming the matrix (b) incorporating the highly ionised salt in the matrix or a precursor thereof, and (c) introducing the aprotic liquid into the matrix or a precursor thereof.
Claim 7
Dependent Claim
31 words
A cathode for an electrochemical cell, which comprises a solid dispersion of a potential oxidant and a highly conductive material in a matrix of a solid electrolyte according to claim 1.
Claim 8
Dependent Claim
37 words
A cathode according to claim 6 comprising 30 to 60% MnO 2 and 2 to 10% carbon black, acetylene black or a transition metal (w/w on total cathode) as particles of less than 40 micron grain size.
Claim 9
Dependent Claim
60 words
A process for preparing a cathode according to claim 6 comprising in any feasible order: (a) forming the matrix incorporating the highly ionised salt in the matrix or a precursor thereof, (c) introducing the aprotic liquid into the matrix or a precursor thereof, and (d) conventionally dispersing the potential oxidant and conductive material in the matrix or a precursor thereof.
Claim 10
Dependent Claim
25 words
An electrochemical cell which comprises a conductive anode and cathode capable of mutual electrochemical reaction and separated by a solid electrolyte according to claim 1.
Claim 11
Dependent Claim
61 words
A cell according to claim 9 wherein the cathode comprises a solid dispersion of a potential oxidant and a highly conductive material in a matrix of a solid electrolyte, and comprises 30 to 60% MnO 2 and 2 to 10% carbon black, acetylene black or a transition metal (w/w on total cathode) as particles of less than 40 micron grain size.
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) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |