High purity lithium polyhalogenated boron cluster salts useful in lithium batteries
AssigneeAir Products and Chemicals, Inc.
InventorsSergei Ivanov, William Casteel, Wade Bailey
Life of this patent
Estimating the term…
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.
Claims17
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 vacuum or 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.
A method for removing impurities from a material comprising at least one member selected from the group consisting of salts, battery electrolytes and components and precursors thereof by at least one of the following methods:
- a) dissolving the material in at least one organic solvent to form a solution and passing said solution through an adsorbent,
- b) dissolving the material in at least one solvent to form a solution, and passing said solution through a cation exchange medium,
- c) drying the material at a temperature and under conditions sufficient to volatize the impurity,
- d) dissolving the material in at least one aprotic organic solvent to form a solution and passing said solution through a sieve.
Dependencies are inferred from the claim text.