US4753859A
Expired / Lapsed
US
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Nonaqueous cell
Assignee: AMERICAN TELEPHONE AND TELEGRAPH COMPANY AT&T LABORATORIES
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Filing: 1987-10-13
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Granted: 1988-06-28
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Expires: 2007-10-13
Abstract
Abstract A nonaqueous, lithium cell is described which exhibits excellent safety characteristics when exposed to abusive testing, as well as high energy density, good charge and discharge rates, and long recycle life. Particularly unique is the composition of the electrolyte which contains such substances as ethylene carbonate, propylene carbonate and one or more polyethylene glycol dialkyl ethers.
Inventors
- 👤 Laura E. Brand
- 👤 Ignacio Chi
- 👤 Shelie M. Granstaff, Jr.
- 👤 Brijesh Vyas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0567; H01M10/0568; H01M10/0569; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M2300/0028; H01M2300/0037; H01M2300/004; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/164; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
50 words
A nonaqueous cell comprising lithium negative electrode, positive electrode comprising active material and electrolyte comprising solvent and current carrying species characterized in that the solvent comprises at least 15 mole percent ethylene carbonate, at least 15 mole percent propylene carbonate and at least 15 mole percent polyethylene glycol dialkyl ether.
Claim 2
Dependent Claim
50 words
A nonaqueous cell comprising lithium negative electrode, positive electrode comprising active material and electrolyte comprising solvent and current carrying species characterized in that the solvent comprises at least 15 mole percent ethylene carbonate, at least 15 mole percent propylene carbonate and at least 15 mole percent polyethylene glycol dialkyl ether.
Claim 3
Dependent Claim
34 words
The cell of claim 1 in which the solvent comprises at least 15 mole percent ethylene carbonate, at least 15 mole percent propylene carbonate and at least 25 mole percent polyethylene glycol dialkyl ether.
Claim 4
Dependent Claim
34 words
The cell of claim 2 in which the solvent comprises 25 to 40 mole percent ethylene carbonate, 25 to 40 mole percent propylene carbonate and 25 to 40 mole percent polyethylene glycol dialkyl ether.
Claim 5
Dependent Claim
17 words
The cell of claim 1 in which the polyethylene glycol dialkyl ether is polyethylene glycol dimethyl ether.
Claim 6
Dependent Claim
14 words
The cell of claim 4 in which the polyethylene glycol dimethyl ether is triglyme.
Claim 7
Dependent Claim
14 words
The cell of claim 4 in which the polyethylene glycol dimethyl ether is tetraglyme.
Claim 8
Dependent Claim
47 words
The cell of claim 1 in which the current carrying species comprises at least one lithium salt selected from the group consisting of LiPF 6 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , LiBF 4 , LiAlCl 4 , LiI, LiF and LiBr.
Claim 9
Dependent Claim
14 words
The cell of claim 7 in which the lithium salt is LiPF 6 .
Claim 10
Dependent Claim
14 words
The cell of claim 7 in which the lithium salt is LiAsF 6 .
Claim 11
Dependent Claim
17 words
The cell of claim 7 in which the concentration of lithium salt is between 0.05M and saturation.
Claim 12
Dependent Claim
19 words
The cell of claim 10 in which the concentration of lithium salt is between 0.25 and 0.75 of saturation.
Claim 13
Dependent Claim
27 words
The cell of claim 7 in which the current carrying species comprises lithium salt and tetraalkylammonium salt with up to six carbon atoms on the alkyl group.
Claim 14
Dependent Claim
36 words
The cell of claim 12 in which the current carrying species comprises lithium salt and one or more tetrabutylammonium salts with anion selected from the group consisting of chlorine, bromine, iodine, hexafluoroarsenate, hexafluorophosphate, tetrafluoroborate and perchlorate.
Claim 15
Dependent Claim
36 words
The cell of claim 12 in which the current carrying species comprises lithium salt and one or more tetraethylammonium salts with anion selected from the group consisting of chlorine, bromine, iodine, tetrafluoroborate, hexafluorophosphate, hexafluoroarsenate and perchlorate.
Claim 16
Dependent Claim
29 words
The cell of claim 12 in which the lithium salt has a concentration between 0.4 and 0.8 molar and tetra-alkylammonium salt has a concentration between 0.2 and 0.4 molar.
Claim 17
Dependent Claim
22 words
The cell of claim 1 in which the solvent comprises in addition diethyl carbonate with concentration between 0 and 30 mole percent.
Claim 18
Dependent Claim
16 words
The cell of claim 16 in which the concentration of diethyl carbonate is 20 mole percent.
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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |