Nonaqueous electrolyte solution, and electrochemical energy-storing device and nonaqueous-electrolyte- solution secondary battery using the same

摘要

A nonaqueous electrolyte solution being liquid at normal temperature, comprising (A) 1,2-dialkoxyethane represented by Formula: R-O-CH2-CH2-O-R' (wherein, R and R', which are same or different from each other, independently represent an unsubstituted or fluorine-substituted alkyl group having a carbon number of 3 or less) and (B) lithium bis[trifluoromethanesulfonyl]imide at a molar ratio [(A)/(B)] of 0.75 or more and 2 or less.