HIGH PURITY LITHIUM POLYHALOGENATED BORON CLUSTER SALTS USEFUL IN LITHIUM BATTERIES

摘要

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: Li2B12F x H12-x-y Z y 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.