The preparation method of high pressure solid density ternary positive electrode material includes the following steps:
Raw material pretreatment: the battery grade lithium carbonate raw material is screened for 200 mesh, and the screened material is lithium carbonate for use;
Ingredients: 3kg ternary precursor ni0.5co0.2mn0.3(oh)2 was weighed, the weight of lithium carbonate was calculated and weighed according to the ratio of molar ratio li: (ni+co+mn) =1.04, and the magnesium content of magnesium oxide was calculated according to 0.25% of the content of metal elements, and then converted to the weight of magnesium oxide; PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC removal of iron
Raw material mixing: The ingredients weighing LITHIUM carbonate, ternary precursor and magnesium oxide, in turn into the high-speed mixer mixing, low speed mixing for 10 minutes, high-speed mixing for 25 minutes, after mixing check no white spots, that is, mixed evenly, the mixture, into PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field production;
Crushing, PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC magnetic removal, mixing, packaging: The product obtained from secondary sintering is crushed, graded and screened in the drying room, and the particle size is controlled d50=10~12um. The iron is removed from the crushed material, and the total content of magnetic substances (fe, zn, cr) in the material after iron removal is less than 20ppb. The material after iron removal is added to the mixing machine, the mixing time is 210 minutes, 350 mesh ultrasonic vibrating screen screening treatment, heat sealing packaging.
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