US4752541A
Expired / Lapsed
US
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Electrolyte for lithium-sulfur dioxide electrochemical cell
Assignee: BP Corp North America Inc
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Filing: 1987-03-09
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Granted: 1988-06-21
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Expires: 2007-03-09
Abstract
Abstract Aluminum chloride can be used as an electrolyte component in a lithium-sulfur dioxide electrochemical cell to improve the cell's discharge capacity and also its electrochemical reversibility.
Inventors
- 👤 Larry R. Faulkner
- 👤 Isobel J. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:17
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M10/00; H01M10/05; H01M10/056; H01M10/0561; H01M10/0563; C; C25; C25C; C25C1/00; C25C1/02; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
49 words
A nonaqueous conductive liquid which comprises a solution of aluminum chloride and at least one lithium salt in a mixture of liquid sulfur dioxide with at least one polar organic compound wherein said polar organic compound has a Donor Number in the range from about 10 to about 25.
Claim 2
Dependent Claim
49 words
A nonaqueous conductive liquid which comprises a solution of aluminum chloride and at least one lithium salt in a mixture of liquid sulfur dioxide with at least one polar organic compound wherein said polar organic compound has a Donor Number in the range from about 10 to about 25.
Claim 3
Dependent Claim
26 words
The liquid of claim 1 wherein said polar organic compound is selected from the group consisting of propylene carbonate, ethylene carbonate, 1,2-dimethoxyethane, 1,3-dioxolane, acetonitrile and γ-butyrolactone.
Claim 4
Dependent Claim
29 words
The liquid of claim 1 wherein said mixture of liquid sulfur dioxide and polar organic compound contains from about 60 to about 99 percent by weight of sulfur dioxide.
Claim 5
Dependent Claim
31 words
The liquid of claim 1 wherein the ratio of moles of aluminum chloride to equivalents of lithium cation in said solution is in the range from about 0.01 to about 50.
Claim 6
Dependent Claim
25 words
The liquid of claim 1 wherein the concentration of aluminum chloride in said solution is in the range from about 0.1 to about 6 molar.
Claim 7
Dependent Claim
12 words
The liquid of claim 1 wherein said lithium salt comprises lithium tetrachloroaluminate.
Claim 8
Dependent Claim
28 words
The liquid of claim 1 wherein the mole ratio of sulfur dioxide to aluminum chloride in said solution is in the range from about 2.0 to about 175.
Claim 9
Dependent Claim
77 words
An electrochemical cell wherein sulfur dioxide is electrochemically reduced upon discharge which comprises in combination: (a) an anode which is comprised of lithium; (b) a cathode; and (c) a nonaqueous conductive liquid electrolyte which comprises a solution of aluminum chloride and at least one lithium salt in a mixture of liquid sulfur dioxide and at least one polar organic compound, said polar organic compound having a Donor Number in the range from about 10 to about 25.
Claim 10
Dependent Claim
77 words
An electrochemical cell wherein sulfur dioxide is electrochemically reduced upon discharge which comprises in combination: (a) an anode which is comprised of lithium; (b) a cathode; and (c) a nonaqueous conductive liquid electrolyte which comprises a solution of aluminum chloride and at least one lithium salt in a mixture of liquid sulfur dioxide and at least one polar organic compound, said polar organic compound having a Donor Number in the range from about 10 to about 25.
Claim 11
Dependent Claim
27 words
The electrochemical cell of claim 8 wherein said polar organic compound is selected from the group consisting of propylene carbonate, ethylene carbonate, 1,2-dimethoxyethane, 1,3-dioxolane, acetronitrile and γ-butyrolactone.
Claim 12
Dependent Claim
37 words
The electrochemical cell of claim 8 wherein the amount of sulfur dioxide is in the range from about 60 to about 99 percent by weight based on the combined weight of polar organic compound and sulfur dioxide.
Claim 13
Dependent Claim
32 words
The electrochemical cell of claim 8 wherein the ratio of moles of aluminum chloride to equivalents of lithium cation in said solution is in the range from about 0.01 to about 50.
Claim 14
Dependent Claim
26 words
The electrochemical cell of claim 8 wherein the concentration of aluminum chloride in said solution is in the range from about 0.1 to about 6 molar.
Claim 15
Dependent Claim
13 words
The electrochemical cell of claim 8 wherein said lithium salt comprises lithium tetrachloroaluminate.
Claim 16
Dependent Claim
29 words
The electrochemical cell of claim 8 wherein the mole ratio of sulfur dioxide to aluminum chloride in said solution is in the range from about 2.0 to about 175.
Claim 17
Dependent Claim
70 words
A process for electrodepositing lithium comprising electrolyzing a nonaqueous solution which comprises aluminum chloride and at least one lithium salt dissolved in a mixture of liquid sulfur dioxide and at least one polar organic compound, said polar organic compound having a Donor Number in the range from about 10 to about 25, wherein the mole ratio of sulfur dioxide to aluminum chloride in said solution is at least about 1.05.
Claim 18
Dependent Claim
70 words
A process for electrodepositing lithium comprising electrolyzing a nonaqueous solution which comprises aluminum chloride and at least one lithium salt dissolved in a mixture of liquid sulfur dioxide and at least one polar organic compound, said polar organic compound having a Donor Number in the range from about 10 to about 25, wherein the mole ratio of sulfur dioxide to aluminum chloride in said solution is at least about 1.05.
Claim 19
Dependent Claim
28 words
The process of claim 15 wherein the mole ratio of sulfur dioxide to aluminum chloride in said solution is in the range from about 2.0 to about 175.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
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