Electrolyte additive for lithium-sulfur dioxide electrochemical cell
First Claim
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1. A nonaqueous conductive liquid which comprises a solution in liquid sulfur dioxide of:
- (a) at least one polar organic compound having a Donor Number in the range from about 10 to about 25;
(b) aluminum chloride;
(c) at least one lithium salt; and
(d) at least one additive which is effective to provide a redox couple in said solution having a potential in the range which is above that of the SO2 /S2 O4-2 couple and below that of the Cl2 /Cl couple, wherein said polar organic compound and lithium salt do not provide a redox coupled in the solution having a potential in said range.
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Abstract
The degradation of organic electrode separators in rechargeable lithium-sulfur dioxide electrochemical cells which utilize chemically uncombined aluminum chloride as an electrolyte component can be reduced by incorporating an additive into the electrolyte which is effective to provide a redox couple having a potential in the range which is above that of the SO2 /S2 O4-2 couple and below that of the Cl2 /Cl- couple.
31 Citations
15 Claims
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1. A nonaqueous conductive liquid which comprises a solution in liquid sulfur dioxide of:
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(a) at least one polar organic compound having a Donor Number in the range from about 10 to about 25; (b) aluminum chloride; (c) at least one lithium salt; and (d) at least one additive which is effective to provide a redox couple in said solution having a potential in the range which is above that of the SO2 /S2 O4-2 couple and below that of the Cl2 /Cl couple, wherein said polar organic compound and lithium salt do not provide a redox coupled in the solution having a potential in said range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrochemical cell comprising in combination:
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(a) an anode which is comprised of lithium; (b) a cathode; (c) an organic electrode separator; and (d) a nonaqueous conductive liquid electrolyte which comprises a solution in liquid sulfur dioxide of aluminum chloride, at least one lithium salt, at least one polar organic compound having a Donor Number in the range from about 10 to about 25 and at least one additive which is effective to provide a redox couple in the electrolyte having a potential in the range which is above that of the SO2 /S2 O4-2 couple and below that of the Cl2 /Cl couple, wherein said polar organic compound and said lithium salt do not provide a redox couple in the electrolyte having a potential in said range. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification