| abstract |
The lithium secondary battery of the present invention comprises a positive electrode; cathode; And an electrolyte formed between the positive electrode and the negative electrode, wherein the positive electrode includes a positive electrode active material represented by the following Formula 1, wherein the electrolyte comprises a lithium salt; Non-aqueous solvent; And a phosphite-based compound represented by the following formula (2), wherein the phosphite-based compound is contained in an amount of 0.1 wt% to 5 wt% based on the total weight of the electrolyte: ≪ Formula 1 > Li x Ni y M 1 - y O 2 - z A z (2) In the above Chemical Formulas 1 and 2, definitions of x, y, z, M, A and R 1 to R 3 refer to the detailed description of the invention. |