A preparation method of a high-capacity monocrystalline type ternary
cathode material comprises steps as follows: S1, a
nickel cobalt manganese hydroxide precursor of a core-shell structure is prepared with a
coprecipitation method, a loose and porous core is prepared by intermittently introducing a certain quantity of
bicarbonate at the initial stage of core making, after core making ends, and loose flaky shells are prepared by substantially reducing the rotation speed and increasing pH; meanwhile, at the core-shell
transition stage, a dispersant is added to effectively prevent agglomerationof the shells due to decrease of the rotation speed; S2, the prepared precursor and
lithium salt are mixed and calcined once in the
oxygen-rich
atmosphere at the high temperature, and the monocrystalline type ternary
cathode material is obtained. A battery is prepared from the ternary
cathode material and has high capacity and good safety performance due to high
lithium ion transport efficiency and reduced
anisotropy in crystals. The problem of poor capacity of the material because of low
lithium ion transport efficiency of monocrystalline type ternary materials is effectively solved. Besides,the monocrystalline type ternary
cathode material is prepared through one-time
sintering, the preparation procedure is simple, and the production cost is low.