| 摘要 |
A non-aqueous electrolyte solution that can improve electrochemical properties over a wide temperature range. Said non-aqueous electrolyte solution, which comprises an electrolyte salt dissolved in a non-aqueous solvent, is characterized in that said non-aqueous solvent contains two or more cyclic carbonates selected from among the following: ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 4-fluoro-1,3-dioxolan-2-on, trans- or cis-4,5-difluoro-1,3-dioxolan-2-on, vinylene carbonate, vinylethylene carbonate, and 4-ethynyl-1,3-dioxolan-2-on. This non-aqueous electrolyte solution is further characterized by containing 0.01-10 mass% of a cyclic acid anhydride to which a side chain containing at least three carbon atoms and having a double or triple bond at the end thereof is bound, represented by general formula (I). Also, an electricity-storage device using said non-aqueous electrolyte solution. (I) (In the formula, R1 and R2 each independently represent a hydrogen atom, a halogen atom, or a C1-6 alkyl group in which one or more hydrogen atoms may be substituted by halogens; and R3 represents either a C2-4 straight-chain or branched alkenyl group that has a double bond at the end thereof or a C2-4 straight-chain or branched alkynyl group that has a triple bond at the end thereof.) |
