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Spherical or spherical-like lithium ion battery cathode material and preparation method and application thereof

The present invention discloses a spherical or spherical-like layered structure lithium-nickel-cobalt-manganese composite oxide cathode material as well as preparation methods and applications thereof. A chemical formula of the cathode material is: LiaNixCoyMnzO2, wherein, 1.0≦a≦1.2, 0.30≦x≦0.90, 0.05≦y≦0.40, 0.05≦z≦0.50, and x+y+z=1. The cathode material powder is a single α-NaFeO2 type layered structure, and full width at half maximum of 110 diffraction peak which is in the vicinity of the X-ray diffraction angle 2 theta of 64.9° is usually 0.07 to 0.15, and the crystal grain size is usually greater than 900 Å and less than 2000 Å. Under scanning electron microscope, it can be seen that the cathode material is mainly consisted of spherical or spherical-like primary mono-crystal particles and a small amount of secondary agglomerated particles, and wherein, the particle diameter of the primary mono-crystal particles is 0.5 to 10 μm and a cumulative percentage of particles with a particle diameter of less than 0.5 μm is usually greater than 60%. The cathode material provided by the present invention has a integral structure and will not crack or break in a long process of circulation. The material processing performance is good. And the lithium ion battery prepared has excellent high temperature stability, safety and high voltage cycling performance.
Owner:GUIZHOU ZHENHUA E CHEM INC
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