Patent ID: 7700243
Filing Date: 2010-04-20
Classification: H01M,Y02E

Abstract:
1. An electrolytic solution for use in nonaqueous electrolytic lithium secondary cells which contains a room temperature molten salt which is an aliphatic quaternary ammonium salt of the formula (1), an organic solvent and a lithium salt of the formula (2), the electrolytic solution being characterized in that the organic solvent contains vinylene carbonate in an amount of 1 to 5 wt. % based on the electrolytic solution wherein R 1 to R 3 are each a chain hydrocarbon having 1 to 4 carbon atoms, R 4 is methoxymethyl, ethoxymethyl, propoxymethyl or isopropoxymethyl, and X 1 and X 2 are each a fluorine-containing anion.