Preparation method of cathode material of lithium-rich ternary compound lithium ion battery

The invention discloses a preparation method of a cathode material of a lithium-rich ternary compound lithium ion battery. The molecular formula of the cathode material is Li1.2Ni0.13Co0.13Mn0.54O2. The preparation method comprises the steps of firstly, stirring an organic precipitant in constant temperature water bath to dissolve the organic precipitant in an organic solvent to obtain a solution I; after that, ultrasonically dissolving soluble cobalt salt, nickel salt, manganese salt and lithium salt in deionized water to obtain a solution II; then, dropwise adding the solution II into the solution I at constant speed, and carrying out a reaction at the temperature of 40-80 DEG C for 2h-4h; drying at 100-120 DEG C; and heating the obtained solid powder in a high temperature tube furnace system by stages, calcining, and cooling the product to room temperature along with the furnace to obtain the lithium-rich ternary compound lithium ion battery cathode material which is good in electrochemical performance and uniform in particles, and has a spherical or ellipsoidal morphology feature. The preparation technology is simple and suitable for industrial scale production.