The invention relates to the field of
lithium ion battery materials, and provides an Al / La co-doped high-
nickel ternary precursor with a core-shell structure and a preparation method thereof, and a positive
electrode material prepared from the precursor. The preparation method mainly comprises the following three steps: step 1, synthesizing an Al-doped high-
nickel ternary precursor with rod-like primary particles under the condition of a low pH value; 2, increasing the pH value on the basis of the step 1, growing a La-doped high-
nickel ternary precursor shell with needle-shaped primary particles by taking the Al-doped high-nickel ternary precursor as an inner core so as to synthesize an Al / La co-doped high-nickel ternary precursor with a core-shell structure; and 3, mixing the Al / La co-doped high-nickel ternary precursor with the core-shell structure and a
lithium salt, and carrying out high-temperature
calcination in an
oxygen atmosphere to obtain the Al / La co-doped ternary positive
electrode material with the core-shell structure. Due to the unique co-doped core-shell structure, the stability of an internal structure is effectively enhanced, the generation of mixed phases such ascation mixing and rock salt structures is inhibited, the breakage of grain boundaries is reduced, the average
oxidation state of
manganese ions is improved, the Jahn-Teller effect is effectively inhibited, the rapid attenuation of the capacity in a cycle process is reduced, the cycle stability of the material is remarkably improved, and the cycle life of the material is remarkably prolonged. Theproduct synthesized by adopting a
coprecipitation method is uniform in component, good in
sphericity, good in reproducibility, easy in condition control, low in preparation cost, high in economic value and wide in application prospect.