| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolyte achieving a lithium ion secondary battery having high cycle life even when a positive electrode containing a positive electrode active material acting at 4.4 V(vsLi/Li) or higher is used.SOLUTION: An electrolyte for a nonaqueous electricity storage device contains: a nonaqueous solvent; a bifunctional acid lithium salt (A) represented by the following formula (1); and a lithium salt (B) that is a lithium salt other than the bifunctional acid lithium salt represented by the following formula (1) and has no boron atom. (In the formula, Rrepresents a 0-10C hydrocarbon group that may be substituted, and Xrepresents a functional group selected from the group consisting of COO, SOand O.) |
