EP0301774A2
Expired / Lapsed
EP
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Polymer Electrolytes
Assignee: AEA TECHNOLOGY BATTERY SYSTEMS Ltd
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Filing: 1988-07-22
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Granted: —
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Expires: 2008-07-22
Abstract
Abstract A solid polymer electrolyte is in the form of a gel comprising a complex of a solid polymer (e.g. poly(ethene oxide) and an alkali metal salt (e.g. LiCl0₄), the polymer being cross-linked to inhibit its transformation from an amorphous form to a crystalline form thereby to improve the alkali metal ion conductivity of the electrolyte at lower temperatures. The electrolyte may be made by irradiating (e.g. by gamma radiation or an electron beam) a solution, preferably aqueous, of the complex to cause the polymer to cross-link and form a gel. The electrolyte may be used as a component in a solid state electrochemical cell (e.g. for a rechargeable lithium battery), where the gel form of the electrolyte assists fabrication.
Inventors
- 👤 Esam Kronfli
- 👤 Alan Hooper
- 👤 Keith Victor Lovell
- 👤 Robin John Neat
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:48
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/181
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A method of making a solid polymer electrolyte comprising irradiating a polymer electrolyte comprising a complex of a polymer and an alkali metal salt, which polymer is capable of forming donor-acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, characterised in that the polymer electrolyte is irradiated in a solution in a solvent, the conditions and type of irradiation and the solvent being such as to cause the polymer to cross-link and convert the solution into a gel thereby to inhibit transformation of the polymer from an amorphous form to a crystalline form.
Claim 2
Independent Claim
99 words
A method of making a solid polymer electrolyte comprising irradiating a polymer electrolyte comprising a complex of a polymer and an alkali metal salt, which polymer is capable of forming donor-acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, characterised in that the polymer electrolyte is irradiated in a solution in a solvent, the conditions and type of irradiation and the solvent being such as to cause the polymer to cross-link and convert the solution into a gel thereby to inhibit transformation of the polymer from an amorphous form to a crystalline form.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein the solution is an aqueous solution and the gel is a hydrogel.
Claim 4
Independent Claim
20 words
A method according to either of the preceding claims wherein the irradiation is by gamma radiation or an electron beam.
Claim 5
Independent Claim
16 words
A method according to any of the preceding claims wherein the solid polymer is poly(ethene oxide).
Claim 6
Independent Claim
15 words
A method according to any of the preceding claims wherein the alkali metal is lithium.
Claim 7
Dependent Claim
60 words
A solid polymer electrolyte in the form of a gel comprising a complex of a solid polymer and an alkali metal salt wherein the polymer is cross-linked to inhibit its transformation from an amorphous form to a crystalline form, which polymer is capable of forming donor-acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions.
Claim 8
Dependent Claim
60 words
A solid polymer electrolyte in the form of a gel comprising a complex of a solid polymer and an alkali metal salt wherein the polymer is cross-linked to inhibit its transformation from an amorphous form to a crystalline form, which polymer is capable of forming donor-acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions.
Claim 9
Dependent Claim
14 words
A solid polymer electrolyte according to claim 6 in the form of a hydrogel.
Claim 10
Dependent Claim
17 words
A solid polymer electrolyte according to claim 6 or 7 wherein the solid polymer is poly(ethene oxide).
Claim 11
Dependent Claim
18 words
A solid polymer electrolyte according to any of claims 6 to 8 wherein the alkali metal is lithium.
Claim 12
Dependent Claim
23 words
A solid polymer electrolyte according to any of claims 6 to 9 in association with an electrode material to form a composite cathode.
Claim 13
Dependent Claim
37 words
A solid polymer electrolyte according to any of claims 6 to 9 as the electrolyte of a solid state electrochemical cell including an alkali metal or alkali metal-based anode and a cathode comprising an insertion electrode material.
References Cited (Backward Citations)
No citation records indexed.
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