| abstract |
Disclosed is an electrolyte solution that realizes a lithium ion secondary battery having a high cycle life even when a positive electrode containing a positive electrode active material that operates at 4.4 V (vsLi / Li + ) or higher is used. A lithium salt other than a non-aqueous solvent, a bifunctional lithium salt (A) represented by the following formula (1), and a bifunctional lithium salt represented by the following formula (1): An electrolyte solution for a non-aqueous electricity storage device, comprising a lithium salt (B) having no boron atom. [Chemical 1] (Wherein R 3 represents an optionally substituted hydrocarbon group having 0 to 10 carbon atoms, and X − represents a functional group selected from the group consisting of COO − , SO 3 − , and O − ). [Selection figure] None |