US3985577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium/fluorographite primary cell with improved electrolyte
Assignee: Eagle Picher Industries Inc
•
Filing: 1974-09-12
•
Granted: 1976-10-12
•
Expires: 1994-09-12
Abstract
Abstract A primary cell having a lithium anode, a fluorographite cathode, and an electrolyte of dimethyl sulfite containing dissolved lithium hexafluoroarsenate demonstrates discharge characteristics in excess of theoretical. For low temperature operation, an electrolyte employing a mixture of dimethyl sulfite and methyl formate solvents gives results superior to either solvent used independently.
Inventors
- 👤 Jerry L. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:25
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/164
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
A primary cell comprising, a lithium anode, a cathode having as the active component thereof a fluorographite of the type (CF x ) n where x is greater than about 0.5 and n is an indefinitely large number, and an electrolyte comprising a solvent and a solute, the said solvent consisting of an organic liquid which is a member of the class consisting of dimethyl sulfite and mixtures of dimethyl sulfite and methyl formate, the said solute consisting of lithium hexafluoroarsenate dissolved in said solvent, the said cell having a yield efficiency which is substantially in excess of 100%.
Claim 2
Dependent Claim
99 words
A primary cell comprising, a lithium anode, a cathode having as the active component thereof a fluorographite of the type (CF x ) n where x is greater than about 0.5 and n is an indefinitely large number, and an electrolyte comprising a solvent and a solute, the said solvent consisting of an organic liquid which is a member of the class consisting of dimethyl sulfite and mixtures of dimethyl sulfite and methyl formate, the said solute consisting of lithium hexafluoroarsenate dissolved in said solvent, the said cell having a yield efficiency which is substantially in excess of 100%.
Claim 3
Dependent Claim
11 words
The primary cell of claim 1 wherein x is about 1.0.
Claim 4
Dependent Claim
12 words
The primary cell of claim 1 wherein said solvent is dimethyl sulfite.
Claim 5
Dependent Claim
13 words
The primary cell of claim 3 wherein the solvent is saturated with solute.
Claim 6
Dependent Claim
38 words
The primary cell of claim 1 wherein said solvent is a mixture of dimethyl sulfite and methyl formate, and wherein the methyl formate content of said mixture is in the range of about 25 to 75% by volume.
Claim 7
Dependent Claim
20 words
The primary cell of claim 5 wherein the volume ratio of the two solvents to one another is about 1:1.
Claim 8
Dependent Claim
14 words
The primary cell of claim 5 wherein the solute concentration is about 1.5 molar.
Claim 9
Dependent Claim
25 words
The primary cell of claim 1 wherein the proportion of electrolyte to fluorographite is about 2 to 3 cc of electrolyte per gram of fluorographite.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |