Non Aqueous Electrolyte Solution And Electricity Storage Device Using Same

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 R and R each independently represent a hydrogen atom a halogen atom or a C alkyl group in which one or more hydrogen atoms may be substituted by halogens; and R represents either a C straight chain or branched alkenyl group that has a double bond at the end thereof or a C straight chain or branched alkynyl group that has a triple bond at the end thereof.)