| abstract |
A nonaqueous electrolyte solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein the nonaqueous electrolyte solution contains 0.01 to 10% by mass of a carboxylic acid ester represented by the following formula (I), wherein the low temperature and high temperature cycle characteristics can be improved; And electrochemical devices using the same. (I) (In formula, R < 1> represents an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, or a cyanoalkyl group, and R < 2> represents a hydrogen atom, an alkoxy group, a formyloxy group, an acyloxy group, an alkoxycarbonyloxy group, an alkanesulfonyl jade. A time period, an arylsulfonyloxy group, an alkylsilyloxy group, a dialkylphosphoryloxy group, an alkoxy (alkyl) phosphoryloxy group and a dialkoxyphosphoryloxy group, R 3 represents a hydrogen atom, -CH 2 COOR 6 or an alkyl group R 4 represents a hydrogen atom or an alkyl group, and R 5 has the same meaning as R 2 , or represents a hydrogen atom, an alkyl group, or —CH 2 COOR 7. R 6 and R 7 each independently represents an alkyl group, an alkenyl group, An alkynyl group or a cycloalkyl group, X represents -OR 8 , -A 2 -C≡Y 2 , -A 2 -C (= O) OA 3 -C≡Y 2 , -A 2 -C (= O) OA 4 or represents a COOR 1. R 8 is the same as R 1, and, a 1? a 3 independently represents an alkylene group, a 4 is alkylene Represents a, Y 2 represents a CH or N. M represents an integer of 0? 4, n represents 0 or 1.) |