Process for the purification of lithium salts
AssigneeAir Products and Chemicals, Inc.
InventorsSergei Vladimirovich Ivanov, William Jack Casteel, Jr., Wade H. Bailey, III
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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, and to methods for purifying battery active materials. The electrolyte comprises at least one solvent and 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.
Claims10
A method for treating lithium salt wherein the 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;
- the method comprising at least one step selected from the group consisting of:
- step a) dissolving the lithium salt in an aprotic organic solvent to form a solution and passing said solution through an adsorbent column,
- step b) dissolving the lithium salt in a solvent to form a solution, and passing said solution through a cation exchange column in Li+ form,
- step c) drying the lithium salt at greater than about 180° C. under vacuum or nitrogen purge, and
- step d) dissolving the lithium salt in an aprotic organic solvent to form a solution and passing said solution through a Li-substituted molecular sieve, then;
- recovering treated lithium salts.
Dependencies are inferred from the claim text.