| abstract |
The present invention provides a lithium secondary battery comprising: a core comprising a lithium composite metal oxide represented by the following general formula (1); A first surface treatment layer, positioned on the surface of the core, comprising a lithium oxide of Formula 2; And a second surface treatment layer disposed on the core or the first surface treatment layer and including a lithium compound represented by the following formula 3 to improve the capacity characteristics and the output characteristics of the battery, A cathode active material for a secondary battery, and a secondary battery comprising the same are provided. [Chemical Formula 1] Li a Ni 1-xy Co x M1 y M3 z M2 w O 2 (2) Li m M4O (m + n) / 2 (3) Li p M5 qa r (Wherein A, M1 to M5, a, x, y, z, w, m, n, p and q are as defined in the specification) |