LITHIUM BATTERY CATHODE MATERIAL, PREPARATION METHOD THEREOF, AND LITHIUM BATTERY USING THE CATHODE MATERIAL

摘要

A lithium ion battery cathode material and a synthesis method thereof are provided. The cathode material is spherical secondary particles comprised of primary particles with diameter from 100 to 200 nm. The secondary particles have porous structure with a pore diameter of 1 to 2 μm. The cathode material has the chemical formula of Li _1+xM _1-xO ₂, where x=0.05-0.25, M is one or more selected from the group consisting of Ni, Co, Mn, Al, Mg, Fe, B, Ti, Cr, Ga, Zn, V, Ge, and Sn. The lithium ion battery cathode material has high energy density, high electrochemical activity, and can well withstand the stress and strain during charging and discharging. A method for preparing this cathode material is also provided. The method not only increases the degree of homogeneity of raw material mixing, but also increases the activity of the cathode material, thus macroscopically improving the cycling stability of the lithium ion battery cathode material during charging and discharging.