US5897974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid polymer electrolyte
Assignee: Rohm and Haas Co
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Filing: 1997-06-12
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Granted: 1999-04-27
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Expires: 2017-06-12
Abstract
Abstract A miscible blend of two acrylic polymers, one of which contains a poly(1,2 -alkyleneoxy) side chain, with a soluble lithium salt yields a conducting polymer system useful in small rechargeable batteries without the need for volatile polar solvents. By employing one polymer with a glass temperature below 35 DEG C. in conjunction with control of molecular weight of both components, a flexible film may be formed by conventional thermoplastic methods. The conductive salt, preferably LiN(CF3SO2)2), may be incorporated during the polymerization which forms the acrylic polymers.
Inventors
- 👤 Edward Ewart LaFleur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:04
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/122; H01M10/056; H01M10/0564; H01M10/0565; H01M6/00; H01M6/14; H01M6/18; H01M6/181; H01M2300/00; H01M2300/0017; H01M2300/0065; H01M2300/0082; H01M6/185; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A conductive matrix composition comprising a. from 10 to 90 percent of a first polymer, having a glass temperature below 35° C. and a weight-average molecular weight of at least 20,000, of polymerized units of (i) from 0 to 90 percent of polymerized units of an alkyl or alkylthioalkyl ester of acrylic or methacrylic acid, and (ii) 10 to 100 percent of polymerized units of a poly(alkyleneoxy)(meth)acrylate comonomer of the formula CH.sub.2 ═CR--COO--(CH.sub.2 --CHR.sub.1 --O).sub.p --R.sub.2, where R is H or CH 3 , R 1 is H or CH 3 , and R 2 is C 1 -C 20 alkyl, cycloalkyl, aryl, alkaryl, or aralkyl, and p is 1-1000; b. from 10 to 90 percent of a second polymer, of weight-average molecular weight at least 30,000, of polymerized units of at least one alkyl ester of acrylic or methacrylic acid, c. from 0.5 to 20 percent of a conductive salt having alkaline earth or alkali metal cations; wherein the first polymer and the second polymer of the matrix composition are miscible, and wherein the conductive salt is miscible with the matrix composition.
Claim 2
Dependent Claim
183 words
A conductive matrix composition comprising a. from 10 to 90 percent of a first polymer, having a glass temperature below 35° C. and a weight-average molecular weight of at least 20,000, of polymerized units of (i) from 0 to 90 percent of polymerized units of an alkyl or alkylthioalkyl ester of acrylic or methacrylic acid, and (ii) 10 to 100 percent of polymerized units of a poly(alkyleneoxy)(meth)acrylate comonomer of the formula CH.sub.2 ═CR--COO--(CH.sub.2 --CHR.sub.1 --O).sub.p --R.sub.2, where R is H or CH 3 , R 1 is H or CH 3 , and R 2 is C 1 -C 20 alkyl, cycloalkyl, aryl, alkaryl, or aralkyl, and p is 1-1000; b. from 10 to 90 percent of a second polymer, of weight-average molecular weight at least 30,000, of polymerized units of at least one alkyl ester of acrylic or methacrylic acid, c. from 0.5 to 20 percent of a conductive salt having alkaline earth or alkali metal cations; wherein the first polymer and the second polymer of the matrix composition are miscible, and wherein the conductive salt is miscible with the matrix composition.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein p is from 8 to 10.
Claim 4
Dependent Claim
33 words
The composition of claim 1 wherein the second polymer is a copolymer of polymerized units of methyl methacrylate and of ethyl acrylate, and wherein component (i) of the first polymer is ethyl acrylate.
Claim 5
Dependent Claim
35 words
The composition of claim 1 wherein the conductive salt is selected from the group consisting of LiClO 4 , LiPF 6 , Li(CF 3 SO 3 ) and LiN(CF 3 SO 2 ) 2 .
Claim 6
Dependent Claim
17 words
The composition of claim 4 wherein the lithium salt is LiN(CF 3 SO 2 ) 2 .
Claim 7
Dependent Claim
30 words
A lithium cell comprising a positive electrode, a negative electrode facing the positive electrolyte and a solid electrolyte interposed therein, wherein the solid electrolyte is the composition of claim 1.
References Cited (Backward Citations)
US4908283A
Cited
US5275750A
Cited
US5356553A
Cited
US5436090A
Cited
US5549988A
Cited
US5665265A
Cited
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