| 摘要 |
Provided are: a nonaqueous electrolyte solution having both stability at high temperatures and high conductivity at low temperatures; and an electricity storage device comprising this nonaqueous electrolyte solution. A nonaqueous electrolyte solution wherein at least one lithium salt is dissolved in a nonaqueous solvent, and which is characterized in that: the nonaqueous solvent contains at least one substance selected from the group consisting of chain carbonates, cyclic carbonates, chain esters, lactones and ethers; the lithium salt contains at least one cyanofluoroborate-lithium salt represented by general formula (I); and the total concentration of all the lithium salts contained in the nonaqueous electrolyte solution is 0.3-4 mol/L. Li·BFX(CN)4-X (I) (In the formula, X represents an integer of 1-3.) |
