US5013619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a polymeric electrolyte
Assignee: Scimat Ltd
•
Filing: 1988-11-21
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Granted: 1991-05-07
•
Expires: 2008-11-21
Abstract
Abstract Melt-extruded polymeric electrolyte material for electrochemical power cells may be coextruded with other components of the cell, notably a lithium metal anode.
Inventors
- 👤 John A. Cook
- 👤 Geroge B. Park
- 👤 Robert H. McLoughlin
- 👤 William J. Whitcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:17
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/18; H01M6/181; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/07; B29K; B29K2105/00; B29K2105/06; B29K2105/16; B29L; B29L2031/00; B29L2031/30; B29L2031/3055; B29L2031/3061; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A method of making a polymeric electrolyte for use in an electrochemical device, comprising melt-blending a mixture of: (a) an inorganic salt; (b) an organic polymer that is capable of permitting sufficient transfer of dissociated ions of the salt that the blend can function as an electrolyte in the device in the substantial absence of liquid; and (c) a plasticiser in an amount from about 5 to about 60% by weight based on the total weight of salt and polymer, the plasticiser having a dielectric constant of at least about 15: and forming the blended mixture into a film.
Claim 2
Independent Claim
99 words
A method of making a polymeric electrolyte for use in an electrochemical device, comprising melt-blending a mixture of: (a) an inorganic salt; (b) an organic polymer that is capable of permitting sufficient transfer of dissociated ions of the salt that the blend can function as an electrolyte in the device in the substantial absence of liquid; and (c) a plasticiser in an amount from about 5 to about 60% by weight based on the total weight of salt and polymer, the plasticiser having a dielectric constant of at least about 15: and forming the blended mixture into a film.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1, in which the blend comprises from about 25 to about 40% by weight of the plasticiser based on the total weight of salt and polymer.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1, in which the dielectric constant of the plasticiser is at least about 30.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1, in which the plasticiser is selected from the group consisting of propylene carbonate, ethylene carbonate, tetramethylene sulphone, gammabutyrolactone and dimethylformamide.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 1, in which the salt is lithium trifluorosulphonate.
Claim 7
Dependent Claim
79 words
A method as claimed in claim 1, in which the polymer has the repeat unit: ##STR4## where R is hydrogen or a group Ra, --CH 2 ORa, --CH 2 OReRa or --CH 2 N(CH 3 ) 2 , and R" is Ra or ReRa, Ra being C 1 to C 16 alkyl or cycloalkyl group and Re being an ether group of the formula --(CH 2 CH 2 O) p where p is a number from 1 to 100.
Claim 8
Dependent Claim
15 words
A method as claimed in claim 7, in which the polymer is poly (ethylene oxide).
Claim 9
Dependent Claim
24 words
A method as claimed in claim 1, in which the film is formed by pressing a quantity of the blended material between two surfaces.
Claim 10
Dependent Claim
15 words
A method as claimed in claim 1, in which the film is formed by melt-extrusion.
Claim 11
Dependent Claim
22 words
A method as claimed in claim 9, in which the blended mixture is extruded onto an alkali or alkaline earth metal electrode.
References Cited (Backward Citations)
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US4121022A
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US4168352A
Cited
FR2442513A1
Cited
US4303748A
Cited
EP0145498A2
Cited
US4818643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |