US4740433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonaqueous battery with special separator
Assignee: AMERICAN TELEPHONE AND TELEGRAPH Co AT&T BELL LABORATORIES
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Filing: 1986-09-29
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Granted: 1988-04-26
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Expires: 2006-09-29
Abstract
Abstract Lithium nonaqueous rechargeable batteries are described in which the separators in the cells have been exposed to a radiation grafting process to increase wettability. This increases charging and discharging rates without use of a wetting agent or addition of undesirable substances to the electrolyte system. In a preferred embodiment, a particularly advantageous electrolyte solvent system (propylene carbonate and ethylene carbonate) is used with excellent charge and discharge rates and excellent cycle life.
Inventors
- 👤 Wen-Tong P. Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:37
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
36 words
A nonaqueous secondary battery comprising a lithium negative electrode, a positive electrode with positive electrode active material, separator material, and electrolyte; characterized in that the separator material comprises microporous polypropylene radiation grafted with an olefinic monomer.
Claim 2
Dependent Claim
36 words
A nonaqueous secondary battery comprising a lithium negative electrode, a positive electrode with positive electrode active material, separator material, and electrolyte; characterized in that the separator material comprises microporous polypropylene radiation grafted with an olefinic monomer.
Claim 3
Dependent Claim
34 words
The battery of claim 1 in which the microporous polypropylene is γ-radiation grafted with an olefinic monomer selected from the group consisting of methacrylic acid, acrylic acid, vinyl pyridine, vinyl pyrrolidone, 1-methyl-2-pyrrolidone and γ-butyrolactone.
Claim 4
Dependent Claim
21 words
The battery of claim 2 in which the monomer is selected from the group consisting of vinyl pyrrolidone and methacrylic acid.
Claim 5
Dependent Claim
12 words
The battery of claim 1 in which the monomer is methacrylic acid.
Claim 6
Dependent Claim
20 words
The battery of claim 1 in which the electrolyte comprises lithium salt, 10-90 weight percent ethylene carbonate, remainder propylene carbonate.
Claim 7
Dependent Claim
18 words
The battery of claim 5 in which the electrolyte comprises 10-50 weight percent ethylene carbonate, remainder propylene carbonate.
Claim 8
Dependent Claim
18 words
The battery of claim 6 in which the electrolyte comprises 25-35 weight percent ethylene carbonate, remainder propylene carbonate.
Claim 9
Dependent Claim
17 words
The battery of claim 5 in which the concentration of lithium salt is between 0.1M and saturation.
Claim 10
Dependent Claim
17 words
The battery of claim 8 in which the concentration of lithium salt is between 0.5 and 1.5M.
Claim 11
Dependent Claim
17 words
The battery of claim 9 in which the concentration of lithium salt is between 0.7 and 1.0M.
Claim 12
Dependent Claim
41 words
The battery of claim 1 in which the lithium salt is 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 13
Dependent Claim
23 words
The battery of claim 8 in which the lithium salt is selected from the group consisting of LiPF 6 and LiAsF 6 .
Claim 14
Dependent Claim
14 words
The battery of claim 9 in which the lithium salt is LiAsF 6 .
Claim 15
Dependent Claim
60 words
The battery of claim 1 in which the active material of the positive electrode is at least one compound selected from the group consisting of NbSe 2 , NbSe 3 , MoS 2 , MoS 3 , TiS 2 , TiS 3 , TaS 2 , V 6 O 13 (stoichiometric and nonstoichiometric), CoO 2 , and MoO 2 .
Claim 16
Dependent Claim
18 words
The battery of claim 14 in which the active material of the positive electrode is NbSe 3 .
Claim 17
Dependent Claim
11 words
The battery of claim 1 in which the electrodes are flat.
Claim 18
Dependent Claim
18 words
The battery of claim 1 in which the battery is in the shape of a rolled cylindrical cell.
References Cited (Backward Citations)
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Cited
US4206275A
Cited
US4201641A
Cited
US4287275A
Cited
US4414090A
Cited
US4629666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |