Patent ID: 8889302

Claim:
A nonaqueous electrolytic solution, comprising: an electrolyte; and a nonaqueous solvent, wherein the nonaqueous electrolytic solution comprises: (A) a first nonaqueous electrolytic solution which comprises (a1) a compound of formula (2): wherein R 7 is an alkyl group comprising 1-12 carbon atoms, optionally substituted with at least one selected from the group consisting of a halogen atom and a phenyl group, R 8 to R 12 are independently a hydrogen atom, a halogen atom, an ether group comprising 1-12 carbon atoms, optionally substituted with a halogen atom, or an alkyl group comprising 1-12 carbon atoms, optionally substituted with a halogen atom, and at least one of R 8 to R 12 is a secondary or tertiary alkyl group comprising 3-12 carbon atoms, optionally substituted with a halogen atom.