US5219684A
Expired / Lapsed
US
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Electrochemical cells containing a safety electrolyte solvent
Assignee: Canada Province of British Columbia
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Filing: 1990-05-16
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Granted: 1993-06-15
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Expires: 2010-05-16
Abstract
Abstract The present invention is an electrolyte which provides superior safety characteristics on cells using the electrolyte. The electrolyte allows for the preparation of cells having acceptable performance when placed in environments where safety concerns are paramount.
Inventors
- 👤 David Wilkinson
- 👤 George Thomas
- 👤 James Dudley
- 👤 Perry Juric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:02
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M4/00; H01M4/02; H01M4/13; H01M4/131; H01M4/36; H01M4/48; H01M4/485; H01M4/50; H01M4/505; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
An electrochemical cell comprising a lithium-containing anode, a cathode including a Li x MnO 2 cathode-active material, a separator, and an safety electrolyte solution of a lithium compound dissolved in an electrolyte solvent having acceptable safety characteristics consisting essentially of sulfolane and a glyme selected from the group consisting of methyl-triglyme, methyl-tetraglyme and mixtures thereof.
Claim 2
Dependent Claim
55 words
An electrochemical cell comprising a lithium-containing anode, a cathode including a Li x MnO 2 cathode-active material, a separator, and an safety electrolyte solution of a lithium compound dissolved in an electrolyte solvent having acceptable safety characteristics consisting essentially of sulfolane and a glyme selected from the group consisting of methyl-triglyme, methyl-tetraglyme and mixtures thereof.
Claim 3
Dependent Claim
29 words
The electrochemical cell of claim 1, wherein said solvent comprises between about 25 and about 90% sulfolane based on the total solvent volume, with the balance being said glyme.
Claim 4
Dependent Claim
27 words
The electrochemical cell of claim 2, wherein said safety electrolyte solvent comprises about 50% sulfolane based on the total solvent volume, with the balance being said glyme.
Claim 5
Dependent Claim
35 words
The electrochemical cell of claim 1, wherein said electrolyte salt is selected from the group consisting of LiAsF 6 , LiN(CF 3 SO 2 ) 2 , LiPF 6 LiBF 4 , and mixtures thereof.
Claim 6
Dependent Claim
33 words
The electrochemical cell of claim 4, wherein said electrolyte salt is present in a concentration of between about 0.5 molar and about 1.5 molar based on the volume of the safety electrolyte 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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |