Patent US3928067A successfully refreshed from Google Patents.
US3928067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyalkylene glycol ethers in rechargeable lithium nonaqueous batteries
Assignee: AT&T Inc
•
Filing: 1974-09-06
•
Granted: 1975-12-23
•
Expires: 1994-09-06
Abstract
Abstract A lithium nonaqueous secondary battery is described which contains certain dopants to improve the recycling characteristics of the battery. Also, certain of these dopants act as wetting agents for the polypropylene separator. These batteries exhibit increased cycle life and increased cycle efficiency. Also, these batteries are more easily manufactured since vacuum filling to wet the separator is not necessary. These dopants include polyalkylene glycol ethers, tetraalkyl ammonium halides, and certain lithium salts.
Inventors
- 👤 John Broadhead
- 👤 Thomas Michael Putvinski
- 👤 Forrest Allen Trumbore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:53
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0564; H01M10/0566; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
A NONAQUEOUS SECONDARY BATTERY COMPRISING A LITHIUM NEGATIVE ELECTRODE, A POSITIVE ELECTRODE, ELECTROLYTE AND MICROPOROUS POLYMER SEPARATORS IN WHICH THE ELECTROLYTE CONSISTS ESSENTAILLY OF A SOLVENT, 0.01-2.0 MOLAR LITHIUM SALT, WHERE THE LITHIUM SALT IS SELECTED FROM THE GROUP CONSISTING OF LII AND LICLO4, AND OTHER DOPANTS CHARACTERIZED IN THAT THE OTHER
Claim 2
Dependent Claim
52 words
A NONAQUEOUS SECONDARY BATTERY COMPRISING A LITHIUM NEGATIVE ELECTRODE, A POSITIVE ELECTRODE, ELECTROLYTE AND MICROPOROUS POLYMER SEPARATORS IN WHICH THE ELECTROLYTE CONSISTS ESSENTAILLY OF A SOLVENT, 0.01-2.0 MOLAR LITHIUM SALT, WHERE THE LITHIUM SALT IS SELECTED FROM THE GROUP CONSISTING OF LII AND LICLO4, AND OTHER DOPANTS CHARACTERIZED IN THAT THE OTHER
Claim 3
Dependent Claim
27 words
The nonaqueous secondary battery of claim 1 in which the solvent is selected from a group consisting of propylene carbonate, butyrolactone, ethylene carbonate, dimethylsulfite, acetonitrile and dimethylsulfoxide.
Claim 4
Dependent Claim
14 words
The nonaqueous secondary battery of claim 2 in which the solvent is propylene carbonate.
Claim 5
Dependent Claim
25 words
The nonaqueous secondary battery of claim 1 in which the lithium negative electrode is a thin film electrode with thickness between 1 and 25 mils.
Claim 6
Dependent Claim
22 words
The noNaqueous secondary battery of claim 1 in which the tetraglyme is used as a wetting agent for the microporous polypropylene separators.
Claim 7
Dependent Claim
17 words
The nonaqueous secondary battery of claim 1 in which the microporous polymer separators consists essentially of polypropylene.
References Cited (Backward Citations)
US3578500A
Cited
US3594235A
Cited
US3658593A
Cited
US3642436A
Cited
US3686038A
Cited
US3796605A
Cited
US3796604A
Cited
US3778310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |