Lithium secondary battery

A lithium secondary battery comprising:

• a negative electrode comprising a negative electrode active material,
• a positive electrode comprising a positive electrode active material represented by Formula 1,
• a separator disposed between the positive electrode and the negative electrode, and
• a non-aqueous electrolyte solution,
• wherein the non-aqueous electrolyte solution comprises a lithium salt, a non-aqueous organic solvent, a compound represented by Formula 2 as a first additive, and lithium difluorophosphate as a second additive:
• LiaNixCoyM1zM2wO2 [Formula 1]
• wherein, in Formula 1,
• M1 is Mn, Al or a combination thereof,
• M2 is at least one selected from the group consisting of Al, Zr, W, Ti, Ca and Sr,
• 0.8≤a≤1.2, 0.7≤x<1, 0<y<0.3, 0<z<0.3, and 0.01<w≤0.2;
• wherein, in Formula 2,
• R is an alkylene group having 1 to 5 carbon atoms.