US4736150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the useful life of rechargeable lithium batteries
Assignee: United States Department of the Army
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Filing: 1986-07-09
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Granted: 1988-04-05
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Expires: 2006-07-09
Abstract
Abstract The cycle life of rechargeable lithium batteries is significantly prolongedy applying to the battery as a charging mode a current interrupted at intervals of 1 milliseconds to 9 seconds in a frequency range of about 0.1 to about 10 Hertz.
Inventors
- 👤 Otto C. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/44; H02; H02J; H02J7/00; H02J7/90; H02J7/927; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
49 words
Method of significantly prolonging the cycle life of rechargeable lithium batteries comprising applying to the battery as a charging mode a current interrupted at intervals of 1 millisecond to 9 seconds in a frequency range of about 0.1 to Hertz, said batteries being charged to a safe voltage limit.
Claim 2
Dependent Claim
49 words
Method of significantly prolonging the cycle life of rechargeable lithium batteries comprising applying to the battery as a charging mode a current interrupted at intervals of 1 millisecond to 9 seconds in a frequency range of about 0.1 to Hertz, said batteries being charged to a safe voltage limit.
Claim 3
Dependent Claim
16 words
Method according to claim 1 wherein the rechargeable lithium battery is a rechargeable lithium-molybdenum disulfide battery.
Claim 4
Dependent Claim
29 words
Method according to claim 2 wherein the interrupted current is applied at a frequency of about 5 Hertz at a duty cycle of 100 milliseconds pulse, 100 milliseconds rest.
Claim 5
Dependent Claim
29 words
Method according to claim 2 wherein the interrupted current is applied at a frequency of about 2 Hertz at a duty cycle of 250 milliseconds pulse 250 milliseconds rest.
Claim 6
Dependent Claim
29 words
Method according to claim 2 wherein the interrupted current charging mode is superimposed on a constant potential that does not exceed the safe voltage limit for charging the battery.
Claim 7
Dependent Claim
16 words
Method according to claim 1 wherein the rechargeable lithium battery is a rechargeable lithium-titanium disulfide battery.
Claim 8
Dependent Claim
29 words
Method according to claim 6 wherein the interrupted current is applied at a frequency of about 5 Hertz at a duty cycle of 100 millimeters pulse, 100 milliseconds rest.
Claim 9
Dependent Claim
29 words
Method according to claim 6 wherein the interrupted current is applied at a frequency of about 2 Hertz at a duty cycle of 250 milliseconds pulse, 250 milliseconds rest.
Claim 10
Dependent Claim
29 words
Method according to claim 6 wherein the interrupted current charging mode is superimposed on a constant potential that does not exceed the safe voltage limit for charging the battery.
Claim 11
Dependent Claim
56 words
Method of significantly prolonging the cycle life of a rechargeable lithium-molybdenum disulfide battery comprising applying to the battery as a charging mode a current interrupted at intervals of 1 millisecond to 9 seconds in a frequency range of about 0.1 to about 10 Hertz wherein the interrupted current charging mode is superimposed on a DC current.
Claim 12
Dependent Claim
56 words
Method of significantly prolonging the cycle life of a rechargeable lithium-molybdenum disulfide battery comprising applying to the battery as a charging mode a current interrupted at intervals of 1 millisecond to 9 seconds in a frequency range of about 0.1 to about 10 Hertz wherein the interrupted current charging mode is superimposed on a DC current.
Claim 13
Dependent Claim
56 words
Method of significantly prolonging the cycle life of a rechargeable lithium-titanium disulfide battery comprising applying to the battery as a charging mode a current interrupted at intervals of 1 millisecond to 9 seconds in a frequency range of about 0.1 to about 10 Hertz wherein the interrupted current charging mode is superimposed on a DC current.
Claim 14
Dependent Claim
56 words
Method of significantly prolonging the cycle life of a rechargeable lithium-titanium disulfide battery comprising applying to the battery as a charging mode a current interrupted at intervals of 1 millisecond to 9 seconds in a frequency range of about 0.1 to about 10 Hertz wherein the interrupted current charging mode is superimposed on a DC current.
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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |