The invention belongs to the field of inorganic non-
metallic materials and relates to a mixed
lithium battery positive material and a preparation method thereof. The preparation method comprises the following steps: mixing
cobalt oxide and a
nickel-
cobalt-
manganese ternary material precursor, and performing two-step
sintering, thereby directly obtaining a mixed positive material of
lithium cobalt oxide and
nickel cobalt
lithium manganate, wherein a microscopic structure formed by
coating nickel cobalt lithium
manganate particles with
lithium cobalt oxide particles is shown in the figure in the specification, and the
diameter of the
lithium cobalt oxide particles is less than that of the nickel cobalt lithium
manganate particles. According to the structure that large and small spheres of
lithium cobalt oxide and nickel cobalt lithium manganate are arranged in a mixed manner, gaps the material can be effectively filled, and the compaction density of the material is improved; the
conductivity of the material can be improved after the material is coated with lithium
cobalt oxide,
dislocation of Li and Ni in a nickel cobalt lithium manganate
crystal structure can be effectively alleviated, and
decomposition of high-valence nickel
ion catalytic
electrolyte is inhibited; moreover, the compaction density of nickel cobalt lithium manganate can be improved after being coated with lithium
cobalt oxide, so that the capacity, stability, high-current
discharge capacity and rate performance of the battery in
unit volume can be effectively improved.