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US4490446A
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Prevention of overpressurization of lithium-thionyl chloride battery cells
Assignee: Westinghouse Electric Corp
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Filing: 1982-12-17
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Granted: 1984-12-25
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Expires: 2002-12-17
Abstract
Abstract A method of preventing overpressurization of a lithium-thionyl chloride battery cell by formation of excessive SO 2 during high rate discharge. The method comprises the step of providing PCl 5 in the cathode. Alternatively, the PCl 5 may be provided in the electrolyte or in both the cathode and electrolyte as desired. The PCl 5 may be incorporated in the cathode by introduction thereof into the porous carbon structure of a preformed carbon element. Alternatively, the PCl 5 may be dry mixed with the carbon and the mixture formed into the desired cathode element.
Inventors
- 👤 Glynn R. Ramsay
- 👤 Dennis J. Salmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:23
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/50; H01M6/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
56 words
The method of preventing overpressurization of a lithium-thionyl chloride battery cell by formation of excessive SO 2 during high rate discharge and thereby increasing the capacity of the cell, said method comprising the step of providing powdered PCl 5 in the cathode of said cell to react with said excessive SO 2 to form soluble products.
Claim 2
Independent Claim
56 words
The method of preventing overpressurization of a lithium-thionyl chloride battery cell by formation of excessive SO 2 during high rate discharge and thereby increasing the capacity of the cell, said method comprising the step of providing powdered PCl 5 in the cathode of said cell to react with said excessive SO 2 to form soluble products.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said cathode comprises a porous cathode structure and the PCl 5 is incorporated therein prior to assembly into the battery cell.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein said cathode comprises a porous carbon cathode structure and the PCl 5 is incorporated therein prior to assembly into the battery cell.
Claim 5
Dependent Claim
42 words
The method of claim 3 wherein said PCl 5 is incorporated in said cathode structure by the steps of forming the cathode under vacuum and with applied heat to form a porous structure and distributing powdered PCl 5 into the porous structure.
Claim 6
Dependent Claim
51 words
The method of claim 3 wherein said PCl 5 is incorporated in said cathode structure by the steps of forming the cathode under vacuum and with applied heat to form a porous structure and distributing powdered PCl 5 into the porous structure by sprinkle/shaking the PCl 5 into the porous structure.
Claim 7
Dependent Claim
25 words
The method of claim 3 wherein said PCl 5 is incorporated in said cathode structure by the step of mixing PCl 5 with particulate carbon.
Claim 8
Dependent Claim
33 words
The method of claim 3 wherein said PCl 5 is incorporated in said cathode structure by the steps of mixing PCl 5 with particulate carbon and pressing the mixture onto a current collector.
Claim 9
Dependent Claim
26 words
The method of claim 3 wherein said PCl 5 is incorporated in said cathode structure by the step of dry mixing PCl 5 with particulate carbon.
Claim 10
Dependent Claim
17 words
A lithium-thionyl chloride battery cell wherein the cathode comprises a porous structure having PCl 5 distributed therein.
Claim 11
Dependent Claim
17 words
A lithium-thionyl chloride battery cell wherein the cathode comprises a porous structure having PCl 5 distributed therein.
Claim 12
Dependent Claim
22 words
The lithium-thionyl chloride battery cell of claim 9 wherein said cathode comprises a porous carbon cathode having said PCl 5 distributed therein.
Claim 13
Dependent Claim
40 words
A lithium-thionyl chloride battery cell wherein the electrolyte comprises a mixture of lithium chloride, aluminum chloride, and phosphorus pentachloride in thionyl chloride and wherein the battery cell includes a carbon cathode and additional phosphorous pentachloride is distributed in said cathode.
Claim 14
Dependent Claim
40 words
A lithium-thionyl chloride battery cell wherein the electrolyte comprises a mixture of lithium chloride, aluminum chloride, and phosphorus pentachloride in thionyl chloride and wherein the battery cell includes a carbon cathode and additional phosphorous pentachloride is distributed in said cathode.
Claim 15
Independent Claim
56 words
The method of preventing overpressurization of a lithium-thionyl chloride battery cell by formation of excessive SO 2 during high rate discharge and thereby increasing the capacity of the cell, comprising the step of providing PCl 5 in the electrolyte of the battery cell, and also in the cathode prior to assembly thereof into the battery cell.
Claim 16
Independent Claim
56 words
The method of preventing overpressurization of a lithium-thionyl chloride battery cell by formation of excessive SO 2 during high rate discharge and thereby increasing the capacity of the cell, comprising the step of providing PCl 5 in the electrolyte of the battery cell, and also in the cathode prior to assembly thereof into the battery cell.
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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |