Purification process for lithium battery electrolytes

Details Purification process for lithium battery electrolytes Purification process for lithium battery electrolytes

1996-10-23

1998-12-15

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Regenerating, salvage or repair feature other than only...

429194, 429188, H01M 1040, H01M 1042

Patent

active

058494294

ABSTRACT:
A process for purification of lithium battery electrolyte solutions is provided whereby the concentrations of trace amounts of impurities such as water in the electrolyte solutions can be reduced. Such electrolyte solutions generally include at least one lithium salt solute contained in at least one organic solvent. Lithium and a second metal with which lithium is capable of intercalating are first placed in electrical contact with one another and then placed in the electrolyte solution. Preferably, aluminum is used as the second metal and the two metals are provided as separate layers that are pressed together in a rolling mill to form a bimetallic sheet. The solution containing the bimetallic sheet is agitated to encourage the reactions which reduce the levels of impurities such as water in the electrolyte solution. The resulting purified solution is then filtered to remove any remaining metal or reaction products. The resulting purified electrolyte solution can be used to make lithium batteries having improved cycling characteristics over batteries using unpurified electrolyte solution.

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