Lithium secondary battery including sulfone-based additive

Abstract

A lithium secondary battery includes: a positive electrode; a negative electrode; and an electrolyte between the positive electrode and the negative electrode, wherein the positive electrode includes a positive active material represented by Formula 1, and the electrolyte includes a lithium salt, a non-aqueous solvent, and a sulfone compound represented by Formula 2. wherein, in Formula 1, 0.9≤x≤1.2, 0.7≤y≤0.98, 0≤z<0.2, M comprises Al, Mg, Mn, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Bi, or a combination thereof, and A is a monovalent anion, a divalent anion, or a combination thereof, and in Formula 2, R1 and R2 are each independently a halogen, an unsubstituted C1-C10 alkyl group, or a C1-C10 alkyl group substituted with a halogen, and a1 and a2 are each independently an integer from 0 to 5.

Dependencies are inferred from the claim text.