CPC H01M 4/525 (2013.01) [H01M 4/131 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 16 Claims |
1. A positive active material for a lithium rechargeable battery, comprising:
a nickel-based lithium metal oxide particle doped with Zr and Al; and
a coating layer disposed on the surface of the nickel-based lithium metal oxide particle,
wherein
the nickel-based lithium metal oxide particle includes
a core portion, and
a shell portion surrounding the core portion and forming a concentration gradient in which a concentration of nickel gradually decreases from an interface with the core portion toward an outer direction,
the coating layer includes an oxyhydroxide of a rare earth element, wherein the rare earth element is cerium (Ce),
the nickel-based lithium metal oxide particle includes:
a first particle having an average particle diameter of 10 μm to 30 μm, and
a second particle having an average particle diameter of 1 μm to 6 μm,
a molar ratio of Zr:Al in the nickel-based lithium metal oxide particles is 10:1 to 2:1.
|