Patent ID: 8568931

Claim:
A non-aqueous electrolyte solution for secondary batteries, which comprises a lithium salt (a1) represented by formula (a1), an inorganic lithium salt (a2), and a solvent, wherein the proportion of the lithium salt (a1) based on the total amount of the lithium salt (a1) and the inorganic lithium salt (a2) is from 5.0 to 20.0 mol %: R 1 —CHF—SO 2 —N(Li)—SO 2 —CHF—R 2 (a1), and wherein in the formula (a1), each of R 1 and R 2 which are independent of each other, is a fluorinated C 1-5 alkyl group which may contain an ethereal oxygen atom, or a fluorine atom.