Patent ID: 7691538

Claim:
A nonaqueous electrolyte secondary battery comprising: a positive electrode having a positive electrode active material capable of intercalating/deintercalating lithium ions; a negative electrode having a negative electrode active material capable of intercalating/deintercalating lithium ions; and a nonaqueous electrolyte in which an electrolyte composed of a lithium salt is dissolved in a nonaqueous solvent, the nonaqueous electrolyte containing: a tertiary carboxylate ester represented by the following general formula (1) in an amount of a range of 40% by mass or more and 80% by mass or less based on the total mass of the nonaqueous solvent: where R1, R2, R3, R4 represent a (C1 to 4) alkyl group, respectively; and one or more acid anhydride selected from succinic anhydride, glutaric anhydride, and glycolic anhydride in an amount of a range of 0.1% by mass or more and 5% by mass or less based on the total mass of the nonaqueous electrolyte.