Electrolyte for lithium cells and method of producing the same
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United States of America Patent
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May 7, 2002
Grant Date -
N/A
app pub date -
Aug 4, 2000
filing date -
Dec 26, 1997
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Expired
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Abstract
The present invention relates to a method of removing water and a free acids content in an electrolytic solution for a lithium battery, and to an electrolytic solution for a lithium battery having a low water content and acids content. The present method is characterized by comprising steps of (a) leading an inert gas through the solvent having a water content of 100 ppm or lower under heating of the solvent to vaporize water together with the solvent to thereby reduce the water content of the solvent, and (b) dissolving the lithium electrolyte in the solvent while maintaining a temperature of the solvent at 20.degree. C. or lower. The present method can make the water content at most 3 ppm and the free acids content less than 1 ppm.
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