The invention provides a preparation method of an
alumina composite
nickel-
cobalt lithium manganate ternary material. The preparation method comprises the following steps: (1), preparing liquor A; (2), preparing liquor B; (3), installing and configuring a reaction flask; (4), adding the liquor A and the liquor B into the reaction flask to participate in
hybrid reaction; (5), preparing liquor C, and adding into the flask for reaction; (6), obtaining a precursor by suction-filtering, washing and
drying; and (7), mixing and
roasting the precursor with a
lithium source to prepare the
alumina composite
nickel-
cobalt lithium manganate ternary material. The preparation method disclosed by the invention has the beneficial effects that firstly, liquid-phase
coating is adopted, production preparation period is short, efficiency is high, and
coating and dispersing are uniform; secondly, the
coating layer
alumina on the surface of the ternary material is a film with an amorphous structure, so that charging and discharging
voltage difference is reduced, multiplying
power performance and high-performance performance of the material are improved; and thirdly, characteristics of a
solid-
liquid phase interface among an
anode material,
electrolyte and a diaphragm are improved by alumina film-coating, so that velocity and efficiency of electrochemical reaction are improved.