US4489145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium battery
Assignee: EIC Laboratories Inc
•
Filing: 1983-10-18
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Granted: 1984-12-18
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Expires: 2003-10-18
Abstract
Abstract The invention features the use of additives such as 2-methylfuran or related cyclic or acyclic organic compounds in non-aqueous electrolyte-containing secondary lithium cells for improving the cycle life of such cells.
Inventors
- 👤 Kuzhikalail M. Abraham
- 👤 S. Barry Brummer
- 👤 Joseph S. Foos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:16
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0567; H01M4/00; H01M4/02; H01M4/36; H01M4/38; H01M4/40; H01M6/00; H01M6/14; H01M6/16; H01M6/162; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
A rechargeable cell comprising a lithium-containing anode, a cathode, and an electrolyte, said electrolyte comprising a solvent, a lithium salt, and an additive in an amount sufficient to improve the cycle-life of said cell, said additive comprising a 5- or 6-member cyclic or acyclic organic compound of the general formulas ##STR15## where each R 1 , R 2 , R 3 , R 4 and R 5 , independently, is hydrogen or lower alkyl and M is oxygen, sulfur, selenium, tellurium, or hydrogenated or lower alkyl-substituted X, where X is nitrogen, phosphorous, arsenic, antimony, or carbon.
Claim 2
Dependent Claim
96 words
A rechargeable cell comprising a lithium-containing anode, a cathode, and an electrolyte, said electrolyte comprising a solvent, a lithium salt, and an additive in an amount sufficient to improve the cycle-life of said cell, said additive comprising a 5- or 6-member cyclic or acyclic organic compound of the general formulas ##STR15## where each R 1 , R 2 , R 3 , R 4 and R 5 , independently, is hydrogen or lower alkyl and M is oxygen, sulfur, selenium, tellurium, or hydrogenated or lower alkyl-substituted X, where X is nitrogen, phosphorous, arsenic, antimony, or carbon.
Claim 3
Dependent Claim
25 words
The cell of claim 1 wherein said additive is present in said electrolyte in a concentration of 0.5% to 5% by volume of said solvent.
Claim 4
Dependent Claim
23 words
The cell of either of claims 1 or 2 wherein said additive comprises furan, 2-methylfuran, 2,5-dimethylfuran, thiophene, 2-methylthiophene, 2,5-dimethylthiophene, N,methylpyrrole, pyrane, or 2-methylpyran.
Claim 5
Dependent Claim
22 words
The cell of claim 1 wherein said solvent comprises tetrahydrofuran, 2-methyltetrahydrofuran, dioxolane, 1,2-dimethoxyethane, diethylether, dimethoxymethane, trimethoxymethane, tetrahydropyran, 2-methyltetrahydropyran, 3-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, or 2,5-dimethyltetrahydropyran.
Claim 6
Dependent Claim
18 words
The cell of claim 1 wherein said lithium salt is present in a concentration of 1.0 to 2.5M.
Claim 7
Dependent Claim
57 words
The cell of either of claims 1 or 5 wherein said lithium salt comprises LiAsF 6 ; LiClO 4 ; LiBR 4 where each R is the same or different lower alkyl or aryl group; LiPF 6 ; LiAlBr 4 ; LiSCN; LiAlCl 4 ; LiBF 4 ; LiBr; lithium trichloroacetate; lithium trifluoromethane sulfonate; or lithium formate.
Claim 8
Dependent Claim
21 words
The cell of claim 1 wherein said anode is lithium or a lithium alloy containing at least 50% lithium by weight.
Claim 9
Dependent Claim
21 words
The cell of claim 7 wherein said alloy comprises lithium-tin, lithium-lead, lithium-gold, lithium-platinum, lithium-cadmium, lithium-mercury, lithium-zinc, lithium-silver, lithium-aluminum, or lithium magnesium.
Claim 10
Dependent Claim
12 words
The cell of claim 1 wherein said aditive comprises furan or 2-methylfuran.
Claim 11
Dependent Claim
23 words
The cell of claim 9 wherein said additive is present in said electrolyte in a concentration of 0.5% by volume of said solvent.
Claim 12
Dependent Claim
12 words
The cell of claim 10 wherein said solvent comprises tetrahydrofuran or 2-methyltetrahydrofuran.
Claim 13
Dependent Claim
10 words
The cell of claim 11 wherein said anode is lithium.
Claim 14
Dependent Claim
44 words
The cell of claim 1 wherein said anode is lithium, said solvent is tetrahydrofuran, said lithium salt is LiAsF 6 present in a concentration of 1.0 to 2.5M, and said additive is 2-methylfuran present in an amount of 0.5% by volume of said solvent.
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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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |