US4309490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long life thionyl chloride cell
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1976-10-08
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Granted: 1982-01-05
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Expires: 1996-10-08
Abstract
Abstract An electrochemical cell having substantially longer storage life comprising a lithium anode, a thionyl chloride depolarizer and solvent, a lithium aluminum chloride electrolyte salt and a quantity of sulfur dioxide admixed in the solvent in an amount sufficient to regulate the growth of lithium chloride crystals formed on the lithium anode. This amount of sulfur dioxide is preferrably sufficient to cause the ratio of moles of lithium aluminum chloride to moles of sulfur dioxide to range from 0.9 to 1.5. A most preferred range is from 1.0 to 1.2.
Inventors
- 👤 David L. Chua
- 👤 William C. Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:51
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
An electrochemical cell, comprising: a lithium anode; a thionyl chloride depolarizer and solvent; an electrolyte salt comprising lithium aluminum chloride; and a quantity of lithium chloride growth regulating sulfur dioxide admixed with said solvent in an amount such that the ratio of the moles of lithium aluminum chloride to moles of sulfur dioxide ranges from 0.9 to 1.5.
Claim 2
Dependent Claim
58 words
An electrochemical cell, comprising: a lithium anode; a thionyl chloride depolarizer and solvent; an electrolyte salt comprising lithium aluminum chloride; and a quantity of lithium chloride growth regulating sulfur dioxide admixed with said solvent in an amount such that the ratio of the moles of lithium aluminum chloride to moles of sulfur dioxide ranges from 0.9 to 1.5.
Claim 3
Dependent Claim
33 words
The electrochemical cell of claim 1 wherein the amount of sulfur dioxide is such that the ratio of moles of lithium aluminum chloride to moles of sulfur dioxide ranges from 1.0 to 1.2.
Claim 4
Dependent Claim
58 words
In an electrochemical cell having a lithium anode, a thionyl chloride depolarizer and solvent, and an electrolyte salt comprising lithium aluminum chloride, the improvement comprising: an amount of lithium chloride growth regulating sulfur dioxide added to said cell to provide a ratio of moles of lithium aluminum chloride to moles of sulfur dioxide ranging from 0.9 to 1.5.
Claim 5
Dependent Claim
58 words
In an electrochemical cell having a lithium anode, a thionyl chloride depolarizer and solvent, and an electrolyte salt comprising lithium aluminum chloride, the improvement comprising: an amount of lithium chloride growth regulating sulfur dioxide added to said cell to provide a ratio of moles of lithium aluminum chloride to moles of sulfur dioxide ranging from 0.9 to 1.5.
Claim 6
Dependent Claim
34 words
The electrochemical cell of claim 3 wherein the amount of sulfur dioxide is sufficient to give a ratio of moles of lithium aluminum chloride to moles of sulfur dioxide ranging from 1.0 to 1.2.
References Cited (Backward Citations)
US3578500A
Cited
US3891458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |