| 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 electrolytic solution, and the positive electrode contains a positive electrode active material represented by the following chemical formula 1, and the non-aqueous electrolysis. The liquid contains a non-aqueous organic solvent, a lithium salt and an additive, and the additive contains lithium difluorophosphate, a tetravinyl silane and a sulton-based compound from 1: 0.05: 0.1 to 1: 1: 1.5. A lithium secondary battery that is a mixed additive contained by weight. [Chemical formula 1] Li (Ni a Co b Mn c ) O 2 With the above chemical formula 1, 0.65 <a ≦ 0.9, 0.05 ≦ b <0.2, 0.05 ≦ c <0.2, and a + b + c = 1. |