The invention provides a lithium secondary battery. The lithium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode and the negative electrode have specific composition and physical properties; the nonaqueous electrolyte solution contains at least one compound selected from the group consisting of a cyclic siloxane compoundrepresented by formula (1), a fluorosilane compound represented by formula (2), and a compound represented by formula (3) and having S-in the molecule thereof, and the content of the compound is 10 ppm or more. And a compound of an F bond, nitrate, nitrite, monofluorophosphate, difluorophosphate, acetate and propionate. The lithium secondary battery has high capacity, long service life and high output power. In formula (1), R1 and R2 are organic groups having 1-12 carbon atoms, and n is an integer of 3-10; in formula (2), R3 to R5 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, and 1<= p+q+r<=3; in formula (3), R6-R8 are organic groups having 1-12 carbon atoms, and A is a group comprising H, C, N, O, F, S, Si and/or P.