US4818647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a cathode for use in a rechargeable lithium battery, cathode so made, and rechargeable lithium battery including the cathode
Assignee: United States Department of the Army
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Filing: 1987-03-20
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Granted: 1989-04-04
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Expires: 2007-03-20
Abstract
Abstract A cathode is made for a rechargeable Li/LixCoO2 cell using an aqueous cathode preparation. The Li/LiAsF6 -MA/LixCoO2 system can deliver between 230-170 Wh/kg at current densities of 2-10mA/cm2.
Inventors
- 👤 Edward J. Plichta
- 👤 Mark Salomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:25
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/621; H01M10/00; H01M10/05; H01M10/052; H01M4/13; H01M4/131; H01M4/139; H01M4/1391; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0568; H01M10/0569; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/168; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A rechargeable lithium battery comprising lithium as the anode, a cathode having a porosity of at least 50 percent and prepared from a cathode mixture of about 80 weight percent lithium cobalt dioxide (Li x CoO 2 where 0≦x≦1), about 10 weight percent Shawinigan carbon black, and about 10 weight percent polytetrafluoroethylene as a dough with additions of an aqueous wetting agent and roll pressing the cathode dough between two Mylar sheets onto both sides of an expanded aluminum screen and sintering at about 280° C. under vacuum for about 1 hour, and 1.5 to 2.0M LiAsF 6 in methyl acetate as the electrolyte.
Claim 2
Dependent Claim
104 words
A rechargeable lithium battery comprising lithium as the anode, a cathode having a porosity of at least 50 percent and prepared from a cathode mixture of about 80 weight percent lithium cobalt dioxide (Li x CoO 2 where 0≦x≦1), about 10 weight percent Shawinigan carbon black, and about 10 weight percent polytetrafluoroethylene as a dough with additions of an aqueous wetting agent and roll pressing the cathode dough between two Mylar sheets onto both sides of an expanded aluminum screen and sintering at about 280° C. under vacuum for about 1 hour, and 1.5 to 2.0M LiAsF 6 in methyl acetate as the electrolyte.
Claim 3
Dependent Claim
18 words
A rechargeable lithium battery according to claim 1 wherein the wetting agent is about 3:1 water:isopropyl alcohol solution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |