Non-aqueous electrolytic solution, electrochemical element using same, and alkynyl compound used therefor

Abstract

The present invention provides an excellent nonaqueous electrolytic solution capable of improving low-temperature and high-temperature cycle properties and load characteristics after high-temperature charging storage, an electrochemical element using it, and an alkynyl compound used for it. The nonaqueous electrolytic solution of the present invention comprises containing at least one alkynyl compound represented by the following general formula (I) in an amount of from 0.01 to 10% by mass in the nonaqueous electrolytic solution.R(O)—X—R  (I)(In the formula, Xrepresents a group —C(═O)—, a group —C(═O)—C(═O)—, a group —S(═O)—, a group —P(═O) (—R)—, or a group —X—S(═O)O—. Rrepresents an alkenyl group, a formyl group, an alkyl group, an acyl group, an arylcarbonyl, an alkanesulfonyl group, an alkynyloxysulfonyl group, an arylsulfonyl group, a dialkylphosphoryl group, an alkyl(alkoxy)phosphoryl group, or a dialkoxyphosphoryl group; Rrepresents an alkynyl group or an alkynyloxy group; Rrepresents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an alkenyloxy group, an alkynyloxy group, or an aryloxy group; n indicates 0 or 1.