The lithium source may be at least one selected from a group consisting of lithium nitrate, lithium chloride, lithium carbonate, lithium hydroxide and lithium acetate. The first dopant containing the first dopant element may be oxides of the first dopant element, or salts of the first dopant element that can be converted into oxides of the first dopant element under the second calcining condition. The salts of the first dopant element may be at least one selected from a group consisting of sulfates, nitrates, acetates, chlorides and oxalates of the first dopant element. The second dopant containing the second dopant element may be oxides of the second dopant element, or salts of the second dopant element that can be converted into oxides of the second dopant element under the second calcining condition. The salts of the second dopant element may be at least one selected from a group consisting of sulfates, nitrates, acetates, chlorides and oxalates of the second dopant element. The third dopant containing the third dopant element may be oxides of the third dopant element, or salts of the third dopant element that can be converted into oxides of the third dopant element under the second calcining condition. The salts of the third dopant element may be at least one selected from a group consisting of sulfates, nitrates, acetates, chlorides and oxalates of the third dopant element. The lithium source, the first dopant, the second dopant and the third dopant may be used in a molar ratio of (1+a):d:e:f, where a, d, e, and f are defined above.

In the step of doping and lithiating, the mixing may be operated by ball milling, shearing, grinding, blending and the like. Preferably, the mixing may be operated for 1-4 hours.