Patent ID: 7524588

Claim:
A nonaqueous secondary battery comprising: a negative electrode using a negative electrode active material containing a carbonaceous material capable of reversibly intercalating and deintercalating lithium, or a mixture of the carbonaceous material and at least one selected from the group consisting of lithium, lithium alloys and metal oxides capable of intercalating and deintercalating lithium; a positive electrode using a positive electrode active material capable of reversibly intercalating and deintercalating lithium; and a nonaqueous electrolyte; the nonaqueous electrolyte containing: (1) a vinyl ethylene carbonate derivative represented by Formula (I): wherein R1 to R6 independently represent a hydrogen atom or an alkyl group having a carbon number of 1 to 4; (2) a cyclic acid anhydride; and (3) at least one cyclic ether derivative selected from the group consisting of 1,3-dioxanes, 1,3-dioxolanes and derivatives thereof, wherein the cyclic acid anhydride is at least one compound selected from the group consisting of succinic anhydride, methylsuccinic anhydride, 2,2-dimethylsuccinic anhydride, glutaric anhydride, 1,2-cyclohexanedicarboxylic anhydride, cis-1,2,3,6-tetrahydrophthalic anhydride, cis-5-norbornene-endo-2,3-dicarboxylic anhydride, phenylsuccinic anhydride, 2-phenylglutaric anhydride and nonenylsuccinic anhydride.