Patent ID: 8785045

Claim:
A positive active material comprising: a core particle containing LiCo (1-x) M x O 2 ; and a coating part covering at least part of a surface of the core particle, wherein: the coating part contains LiV (1-a) M a OPO 4 , M in the LiCo (1-x) M x O 2 is at least one element selected from the group consisting of Al, Mg, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn, 0≦x≦0.95, M in the LiV (1-a) M a OPO 4 may be at least one element selected from the group consisting of Ti, Ni, Co, Mn, Fe, Zr, Cu, Zn, and Yb, and 0≦a≦0.05.