abstract |
A non-aqueous electrolyte for a secondary battery and a non-aqueous electrolyte secondary battery having both good cycle characteristics and high output characteristics are provided. SOLUTION: Hydrogen fluoride in a non-aqueous electrolyte is 10 ppm or more and 300 ppm or less, and further, a cyclic siloxane compound of formula (1), a fluorosilane compound of formula (2), a compound of formula (3), and a molecule A compound having an SF bond therein, nitrate, nitrite, monofluorophosphate, difluorophosphate, acetate or propionate is contained at 10 ppm or more in the whole non-aqueous electrolyte. Non-aqueous electrolyte for secondary batteries. [In (1), R 1 and R 2 are organic groups having 1 to 12 carbon atoms, and n is an integer of 3 to 10. In (2), R 3 to R 5 are organic groups having 1 to 12 carbon atoms, x is an integer of 1 to 3, p, q, and r are each an integer of 0 to 3, 1 ≦ p + q + r ≦ 3. In (3), R 6 to R 8 are organic groups having 1 to 12 carbon atoms, and A is a group composed of H, C, N, O, F, S, Si and / or P. ] [Selection figure] None |