US3915743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery with negative lithium electrode
Assignee: VARTA Batterie AG
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Filing: 1974-06-26
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Granted: 1975-10-28
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Expires: 1994-06-26
Abstract
Abstract A battery with a negative lithium electrode and an organic electrolyte comprising boron trifluoride and a mixture of an alkyl carbonate and an ether such as dimethyl carbonate and 1,2dimethoxy ethane.
Inventors
- 👤 Helmut Lauck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:13
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0564; H01M10/0566; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/164; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
IN AN ELECTRICAL CELL WITH A NEGATIVE LITHIUM, CALCIUM, ALUMINUMOR MAGNESIUM ELECTRODE AND A POSITIVE SULPHUR ELECTRODE AND AN ELECTROLYTE COMPRISING A CONDUCTIVE SALT AND AN ORGANIC SOLVENT WHICH CONTAINS BORON TRIFLUORIDE, THE IMPROVEMENT BEING THAT THE ORGANIC ELECTROLYTE COMPRISES A DI(LOWER ALKYL) CARBONATE WHEREIN THE LOWER ALKYL IS UP TO THREE CARBON ATOMS AND AN ETHER SELECTED FROM THE GROUP OF GLYCOL ETHERS HAVING ONE OF THE FORMULAS:
Claim 2
Dependent Claim
69 words
IN AN ELECTRICAL CELL WITH A NEGATIVE LITHIUM, CALCIUM, ALUMINUMOR MAGNESIUM ELECTRODE AND A POSITIVE SULPHUR ELECTRODE AND AN ELECTROLYTE COMPRISING A CONDUCTIVE SALT AND AN ORGANIC SOLVENT WHICH CONTAINS BORON TRIFLUORIDE, THE IMPROVEMENT BEING THAT THE ORGANIC ELECTROLYTE COMPRISES A DI(LOWER ALKYL) CARBONATE WHEREIN THE LOWER ALKYL IS UP TO THREE CARBON ATOMS AND AN ETHER SELECTED FROM THE GROUP OF GLYCOL ETHERS HAVING ONE OF THE FORMULAS:
Claim 3
Dependent Claim
18 words
The cell of claim 1 wherein the organic electrolyte comprises a mixture of dimethyl carbonate and 1,2-dimethyoxy ethane.
Claim 4
Dependent Claim
18 words
The cell of claim 1, wherein said salt is selected from the group of LiBF4, LiAlCl4 and LiF.
Claim 5
Dependent Claim
27 words
The cell of claim 2, wherein said dimethyl carbonate and 1,2-dimethoxy ethane are present in said mixture in the proportion of about 1 : 2 by weight.
Claim 6
Dependent Claim
37 words
The cell of claim 4, wherein said electrolyte comprises about 20 percent by weight dimethyl carbonate, about 45 percent by weight 1,2-dimethoxy ethane, about 20 percent by weight boron trifluoride, and about 10 percent by weight LiBF4.
Claim 7
Dependent Claim
21 words
The cell of claim 1, wherein boron trifluoride is present in the proportion of at least about 15 percent by weight.
Claim 8
Dependent Claim
13 words
The cell of claim 1, further comprising a positive electrode including the following:
Claim 9
Dependent Claim
16 words
The cell of claim 1, wherein said electrodes have been vacuum-dried before incorporation into the battery.
Claim 10
Dependent Claim
23 words
The cell of claim 1, wherein said negative electrode is in the form of a lithium foil pressed onto expanded copper or nickel.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |