The positive electrode material in accordance with the present disclosure is obtained by subjecting the nickel cobalt manganese active material to doping and lithiating, which involve the step of programmed calcining, to obtain higher particle strength. Without intending to be bond to any theory, it is believed that dopant elements may be partially incorporated into the skeleton of the particles, stabilizing the lattice structure and thereby increasing the strength of the particles. At the same time, if there is a coating layer, it can inhibit or alleviate the interfacial reaction between the positive electrode material and electrolyte, thereby inhibiting or alleviating the corrosion of the positive electrode material by electrolyte. More importantly, the doped nickel cobalt manganese active material forms the skeleton of the positive electrode material. It makes the positive electrode material in accordance with the present disclosure have an intrinsic specific surface area and an intrinsic pore size within the required ranges. Accordingly, even after multiple battery cyclings, controlled pore configuration may be maintained. Such positive electrode material may have the characteristics of good rate performance and good cycling stability.

In a preferred embodiment, in the formula of the nickel cobalt manganese active material, 0.6≤x≤0.94, 0.03≤y≤0.2, 0.03≤z≤0.2.

In one embodiment, the doped nickel cobalt manganese active material may have a formula of Li_1+a (Ni_xCo_yMn_zM_dG_eT_f) O₂, wherein 0≤a≤0.1, 0.3≤x≤0.99, 0.01≤y≤0.5, 0.01≤z≤0.5, 0≤d≤0.08, 0≤e≤0.05, 0≤f≤0.03, 1≤e/f≤5, and x+y+z+d+e+f=1.

In another aspect, provided in the present disclosure is a method for preparing the above positive electrode material, comprising: