High-nickel lithium ion positive electrode material and preparation method thereof

The invention discloses a high-nickel lithium ion positive electrode material. The molecular formula is LiNiCoMnMO2, wherein M is a doping element, the lithium ion positive electrodematerial is spherical secondary particle formed by gathering primary particle, and the structure of the lithium ion positive electrode material is a homogeneous-phase structure, a core-shell structure and a concentration gradient structure. The preparation method of the lithium ion positive electrode material comprises the steps of preparing a high-nickel positive electrode material precursor andpreparing the lithium ion secondary battery positive electrode. The precursor of the high-nickel positive electrode material is synthesized by a co-precipitation method, uniform mixing of elements can be facilitated, reaction can be more sufficient by adding the aging process, and morphology control is facilitated; and with the adoption of multi-element co-doping, the stability of a material crystal structure can be improved, the