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US5460903A
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Ionically conductive polymer gels
Assignee: BTG International Ltd
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Filing: 1992-09-29
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Granted: 1995-10-24
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Expires: 2012-09-29
Abstract
Abstract PCT No. PCT/GB92/01781 Sec. 371 Date Feb. 24, 1994 Sec. 102(e) Date Feb. 24, 1994 PCT Filed Sep. 29, 1992 PCT Pub. No. WO93/07626 PCT Pub. Date Apr. 15, 1993.A bulk ionically conductive polymer gel is prepared by dissolving a salt such as lithium trifluoromethanesulphonate (which would provide lithium ion conductors) in an organic compound such as N-formylpiperidine. The organic compound dissolves the salt at 20 DEG C. but is not a solvent at 20 DEG C. (though it is at 215 DEG C.) for polyethylene terephthalate. The last-named is a crystallizable polymer which is added in a minor amount at a high temperature to the other components and provides the required mechanical rigidity for the product at lower temperatures.
Inventors
- 👤 Hugh V. St. Aubyn Hubbard
- 👤 James E. McIntyre
- 👤 Victor Rogers
- 👤 Ian M. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:57
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/168; H01M6/164; H01M6/18; H01M6/181; H01M6/22; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
An ionically conductive ion-containing gel having a bulk ionic conductivity at 20° C. and 10 kHz greater than 10 -4 Siemens/cm and a dynamic modulus at 10 Hz greater than 10 3 Pa, wherein the gel contains up to 50% by mass of a crystallizable polymer selected from the group consisting of poly(ethylene terephthalate), poly(1,4-butylene terephthalate), poly(3-oxybutanoate), polyhydroxybutyric acid, poly(hexamethylene adipamide), poly(metaxylylene adipamide), poly(m-phenylene isophthalamide), poly(vinylidene fluoride), polyoxymethylene and polyoxyethylene, over 50% by mass of an organic compound that is not a solvent for the crystallizable polymer at 20° C., said compound being selected from the group consisting of dimethyl formamide, dimethyl acetamide, N-methyl-2-pyrrolidinone, N-formyl piperidine, a dimethyl ether of diethylene glycol, triethylene glycol or tetraethylene glycol, and dimethyl sulphoxide and a lithium salt with an anion selected from the group consisting of Br - , I - , a pseudohalogen and a perfluorinated alkyl carboxylate or sulphonate, said salt being soluble in the said compound at 20° C. and dissolved therein at a concentration greater than 4% by mass based on said compound.
Claim 2
Dependent Claim
174 words
An ionically conductive ion-containing gel having a bulk ionic conductivity at 20° C. and 10 kHz greater than 10 -4 Siemens/cm and a dynamic modulus at 10 Hz greater than 10 3 Pa, wherein the gel contains up to 50% by mass of a crystallizable polymer selected from the group consisting of poly(ethylene terephthalate), poly(1,4-butylene terephthalate), poly(3-oxybutanoate), polyhydroxybutyric acid, poly(hexamethylene adipamide), poly(metaxylylene adipamide), poly(m-phenylene isophthalamide), poly(vinylidene fluoride), polyoxymethylene and polyoxyethylene, over 50% by mass of an organic compound that is not a solvent for the crystallizable polymer at 20° C., said compound being selected from the group consisting of dimethyl formamide, dimethyl acetamide, N-methyl-2-pyrrolidinone, N-formyl piperidine, a dimethyl ether of diethylene glycol, triethylene glycol or tetraethylene glycol, and dimethyl sulphoxide and a lithium salt with an anion selected from the group consisting of Br - , I - , a pseudohalogen and a perfluorinated alkyl carboxylate or sulphonate, said salt being soluble in the said compound at 20° C. and dissolved therein at a concentration greater than 4% by mass based on said compound.
Claim 3
Dependent Claim
16 words
A gel according to claim 1, whose dynamic modulus at 10 Hz exceeds 10 4 Pa.
Claim 4
Dependent Claim
16 words
A gel according to claim 2, whose dynamic modulus at 10 Hz exceeds 10 5 Pa.
Claim 5
Dependent Claim
37 words
A method of making a gel as defined in claim 1, comprising forming a solution of the polymer in the organic compound at above 20° C., incorporating the salt beforehand, simultaneously or afterwards, and cooling the solution.
Claim 6
Dependent Claim
15 words
A method according to claim 4, wherein said solution is formed at above 100° C.
Claim 7
Dependent Claim
15 words
A method according to claim 5, wherein said solution is formed at above 150° C.
Claim 8
Dependent Claim
16 words
A galvanic cell wherein an electrolyte comprises a gel made by the method of claim 4.
Claim 9
Dependent Claim
13 words
A galvanic cell wherein an electrolyte comprises a gel according to claim 1.
Claim 10
Dependent Claim
42 words
A gel according to claim 1, wherein said anion is selected from the group consisting of SCN - , ClO 4 - , HgI 3 - , BF 4 - , CF 3 COO - and CF 3 SO 3 - .
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