| abstract |
A core comprising a compound capable of reversibly intercalating and deintercalating lithium; And it provides a cathode active material for a lithium secondary battery comprising a compound of formula 1 attached to the surface of the core. The compound of Formula 1 may prevent direct contact between the core and the lithium secondary battery electrolyte, thereby suppressing side reactions in a high temperature / high voltage environment. [Formula 1] Li 1 + x Al x M 2x (PO 4 ) 3 Wherein, M is selected from the group consisting of Ti, Cr, Ga, Fe, Sc, In, Y, L, Mg and Si, and the range of x is 0 <x≤0.7. |