| abstract |
The present invention includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material represented by the following Chemical Formula 1, wherein the non-aqueous electrolyte includes a non-aqueous organic solvent, a lithium salt and A lithium secondary battery comprising an additive, wherein the additive is a mixed additive comprising lithium difluorophosphate, tetravinylsilane, and a sultone-based compound in a weight ratio of 1:0.05:0.1 to 1:1:1.5 [Formula 1] Li(Ni a Co b Mn c )O 2 In Formula 1, 0.65<a≤0.9, 0.05≤b<0.2, 0.05≤c<0.2, and a+b+c=1. |