US4550064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High cycle life secondary lithium battery
Assignee: California Institute of Technology
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Filing: 1983-12-08
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Granted: 1985-10-29
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Expires: 2003-12-08
Abstract
Abstract A secondary battery (10) of high energy density and long cycle is achieved by coating the separator (18) with a film (21) of cationic polymer such as polyvinyl-imidazoline. The binder of the positive electrode (14) such as an ethylene-propylene elastomer binder (26) containing particles (28) of TiS2 chalcogenide can also be modified to contain sulfone functional groups by incorporating liquid or solid sulfone materials such as 0.1 to 5 percent by weight of sulfolane into the binder. The negative lithium electrode (14), separator (18) and positive electrode (16) are preferably spirally wound and disposed within a sealed casing (17) containing terminals (32, 34). The modified separator and positive electrode are more wettable by the electrolytes in which a salt is dissolved in a polar solvent such as sulfolane.
Inventors
- 👤 Shiao-Ping S. Yen
- 👤 Boyd J. Carter
- 👤 David H. Shen
- 👤 Robert B. Somoano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M4/00; H01M4/02; H01M4/62; H01M4/621; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/44; H01M50/489; H01M50/491; H01M2300/00; H01M2300/0017; H01M2300/0025; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
47 words
A separator for use in a battery comprising a sheet of hydrophobic, porous elastomer polymer material containing a surface film of a poly-alkenyl imidazoline containing a repeating unit of the formula: ##STR4## where R is slected from H, alkyl of 1 to 5 carbon atoms or phenyl.
Claim 2
Dependent Claim
47 words
A separator for use in a battery comprising a sheet of hydrophobic, porous elastomer polymer material containing a surface film of a poly-alkenyl imidazoline containing a repeating unit of the formula: ##STR4## where R is slected from H, alkyl of 1 to 5 carbon atoms or phenyl.
Claim 3
Dependent Claim
16 words
A separator according to claim 1 in which the sheet is formed of a hydrocarbon polymer.
Claim 4
Dependent Claim
12 words
A separator according to claim 2 in which the polymer is polypropylene.
Claim 5
Dependent Claim
12 words
A separator as defined in claim 1 in which R is methyl.
Claim 6
Dependent Claim
96 words
A battery comprising in combination: a first electrode comprising a dispersion of a chalcogenide in a hydrophobic, hydrocarbon elastomer binder absent unsaturation; a second electrode including a Group Ia metal intercalatable with said chalcogenide; a porous separator disposed between said electrodes comprising a hydrophobic elastomer substrate having a surface film of a poly-alkenyl imidazoline of the formula: ##STR5## where R is slected from H, alkyl of 1 to 5 carbon atoms or phenyl; an electrolyte comprising a sulfolane solvent in which is dissolved in an ionizable metal salt; and a casing receiving said electrodes and separator.
Claim 7
Dependent Claim
96 words
A battery comprising in combination: a first electrode comprising a dispersion of a chalcogenide in a hydrophobic, hydrocarbon elastomer binder absent unsaturation; a second electrode including a Group Ia metal intercalatable with said chalcogenide; a porous separator disposed between said electrodes comprising a hydrophobic elastomer substrate having a surface film of a poly-alkenyl imidazoline of the formula: ##STR5## where R is slected from H, alkyl of 1 to 5 carbon atoms or phenyl; an electrolyte comprising a sulfolane solvent in which is dissolved in an ionizable metal salt; and a casing receiving said electrodes and separator.
Claim 8
Dependent Claim
20 words
A battery according to claim 5 in which the electrodes and separators are in the form of a spiral-wound assembly.
Claim 9
Dependent Claim
44 words
A battery according to claim 5 in which the solvent comprises a compound of the formula: ##STR6## where R 1 and R 2 are individually selected from H, alkyl and 1 to 5 carbon atoms, alkoxy of 1 to 5 carbon atoms or aryl.
Claim 10
Dependent Claim
17 words
A battery according to claim 5 in which the solvent comprises sulfolane, 3-methyl sulfolane or 2,4-dimethyl sulfolane.
Claim 11
Dependent Claim
12 words
A battery according to claim 5 in which the metal is lithium.
Claim 12
Dependent Claim
72 words
A battery according to claim 5 in which the chalcogenide is selected from compounds of the formula: M.sub.n 'X.sub.m where M' is a metal selected from the group consisting of titanium, zirconium, hafnium, niobium, tantalum, or vanadium; X is an element selected from oxygen, sulfur, selenium or tellurium, n is a number having a value from about 1.0 to 6.0 and m is a number having a value from 2 to 13.
Claim 13
Dependent Claim
13 words
A battery according to claim 10 in which the chalcogenide is titanium disulfide.
Claim 14
Dependent Claim
19 words
A battery according to claim 11 in which the elastomer binder contains a minor amount of sulfone functional groups.
Claim 15
Dependent Claim
21 words
A battery according to claim 12 in which the binder contains from 0.1 to 5% by weight of a sulfolane liquid.
Claim 16
Dependent Claim
19 words
A battery according to claim 13 in which the sulfolane is selected from sulfolane, 3-methyl sulfolane and 2,4-dimethyl sulfolane.
Claim 17
Dependent Claim
14 words
A battery according to claim 5 in which the elastomer is an ethylene-propylene copolymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |