The high pressure solid density ternary cathode material has a spherical shape, the secondary aggregate particle size d50 is 10 ~ 12µm, and the primary single crystal particle size is 1.5 ~ 3µm, including the following steps:
For raw MATERIAL pretreatment, the raw material battery grade LITHIUM carbonate and the ternary precursor ni0.5co0.2mn0.3(oh)2 were screened with PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field respectively. The lithium carbonate and the ternary precursor ni0.5co0.2mn0.3(oh)2 are mixed according to the ratio of molar ratio li: (ni+co+mn) =1.0 ~ 1.06. Metal oxides are added in the dosing process. The amount of metal added in the metal oxides is calculated according to 0.1% ~ 1.0% of the theoretical mass of the product.
Primary and secondary sintering, the obtained mixture is sintered once, the primary sintering temperature zone temperature is 600 ~ 930℃, the duration is 16 ~ 30 hours, in the sintering process continues to pass a certain flow of air, and timely discharge of carbon dioxide; After the completion of primary sintering, the obtained semi-finished products are broken, sieving, pulping washing, drying, PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field, and then secondary sintering, the secondary sintering of the main temperature zone temperature of 900 ~ 1000℃, the duration of 3 ~ 12 hours;
Crushing, sifting, PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC field Iron removal, mixing, packaging, secondary sintering products in the drying room for grinding, grading and screening, control particle size d50=10 ~ 12µm; The total content of magnetic foreign matter (fe, cr, zn) in the material after iron removal is less than 20ppb; The material after iron removal is placed into the mixer for mixing, the time is 3 ~ 6 hours, the material is screened 300 ~ 400 mesh, and the heat seal packaging.
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