Lithium ion battery positive electrode material and preparation method thereof

The invention discloses a lithium ion battery positive electrode material, which comprises positive electrode active powder, a shell material, a doping material, a dispersing agent and a complexing agent. The invention further discloses a preparation method of the lithium ion battery positive electrode material, which comprises the steps of S1, dissolving the shell material and the doping materialin deionized water according to a stoichiometric ratio, and then adding the complexing agent and the dispersing agent to form a uniform and stable solution; S2, adding the positive electrode active powder until the liquid phase and the solid phase are in full contact with each other; S3, placing the completely soaked slurry at the temperature of 60-200 DEG C for vacuum drying to form a doped shell positive electrode active material; and S4, sintering the dried powder at the temperature of 500-900 DEG C in an atmosphere furnace, and carrying out heat preservation for 4-20 hours. The shell coating material and the dopi