High purity lithium polyhalogenated boron cluster salts useful in lithium batteries
First Claim
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1. 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.
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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-yZywhere 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.
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Citations
17 Claims
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1. A method for treating lithium salts comprising at least one step selected from the group of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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:
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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. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification