Patent ID: 11901552
Assignee: POSCO FUTURE M CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H  Y | IPC H

Claim 0:
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.