High purity lithium polyhalogenated boron cluster salts useful in lithium batteries
AssigneeAir Products and Chemicals, Inc.
InventorsSergei Ivanov, William Casteel, Wade Bailey
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Abstract
The present invention relates to lithium secondary batteries comprising a negative electrode, a positive electrode, a separator and a lithium-based electrolyte carried in an aprotic solvent, and to the electrolyte compositions. The electrolyte comprises a lithium salt of the formula: Li2B12FxH12-x-yZy where x+y is from 3 to 12, and x and y are independently from 0 to 12, and Z comprises at least one of Cl and Br.
Claims17
A battery comprising:
- an anode, a cathode and an electrolyte comprising
- at least one lithium salt of the formula:
- Li2B12FxH12-x-yZy
- where x+y is from 3 to 12, and x and y are independently from 0 to 12, and Z comprises at least one of Cl and Br.
A lithium salt comprising:
- Li2B12FxH12-x-yZy
- where x+y is from 3 to 12, and x and y are independently from 0 to 12, and Z comprises at least one of Cl and Br, and a hydroxyl content of less than about 1,000 ppm.
An electrolyte comprising a combination of at least one lithium salt and at least one solvent, wherein said lithium salt comprises:
- Li2B12FxH12-x-yZy
- where x+y is from 3 to 12, and x and y are independently from 0 to 12, and Z comprises at least one of Cl and Br.
A method for treating lithium salts comprising at least one step selected from the group of:
- a) dissolving the salt in an aprotic organic solvent to form a solution and passing said solution through an alumina column,
- b) dissolving the salt in a solvent to form a solution, and passing said solution through a cation exchange column in Li+ form,
- c) drying the salt at greater than about 180° C. under dynamic vacuum or dynamic nitrogen purge,
- d) dissolving the salt in an aprotic organic solvent to form a solution and passing said solution through a Li-substituted molecular sieve, and;
- recovering lithium salts.
Dependencies are inferred from the claim text.