Nickel cobalt lithium manganate composite material and preparation method thereof

[0025] see figure 1 , figure 1 It is a schematic flow diagram of the preparation method of the nickel-cobalt lithium manganese oxide composite material in one embodiment of the present invention, specifically comprising the following steps:

[0026] S11, the ternary precursor Ni x co y mn z (OH) 2 , lithium salt and co-solvent are uniformly mixed according to a predetermined ratio to obtain a first mixed material, wherein the sum of X, Y and Z is 1;

[0027] S12, calcining the first mixed material, then cooling, pulverizing, sieving, and removing iron from the cooled material to obtain a single crystal nickel cobalt lithium manganese oxide material Li 1 + x Ni x co y mn z o 2 ;

[0028] S13, uniformly mixing the prepared single crystal nickel cobalt lithium manganese oxide material with carbon source and metal oxide according to a predetermined ratio to obtain a second mixed material;

[0029] S14, calcining the second mixed material, then cooling, pulverizing, sievin

[0044] Take 1000g ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 , 431.5g of lithium carbonate and 7.1536g of boron oxide were mixed in a mixer for 4 hours, and the mixed material was put into a calciner, fed with dry air, sintered at 940°C for 20 hours and then cooled, and the cooled The material is pulverized in a small airflow machine, the particle size is controlled at 4-7μm, and then the iron is sieved to obtain a single crystal nickel cobalt lithium manganese oxide material, which is recorded as NCM-1; take 900g of the prepared single crystal nickel cobalt lithium manganese oxide material Material, 1.8g polyethylene glycol and 4.5g Al 2 o 3 Put it in a ball mill and mix it for 2 hours, put the mixed material into the calcination device, pass in nitrogen gas, sinter at 600°C for 8 hours and then cool it, pulverize the cooled material in a mechanical pulverizer, and pass through a sieve The single-crystal nickel-cobalt-lithium manganese oxide composite material coated wit

[0046] Take 1000g ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 , 431.5g of lithium carbonate and 8.6291g of aluminum fluoride were mixed in a mixer for 4 hours, the mixed material was put into a calcination device, fed with dry air, sintered at 980°C for 20 hours and then cooled, and the cooled The final material is pulverized in a small airflow machine, and the particle size is controlled at 4-7 μm, and then the single crystal nickel cobalt lithium manganese oxide material is obtained by sieving iron, which is recorded as NCM-1; take 900g of the prepared single crystal nickel cobalt manganese acid Lithium material, 1.8g glucose and 4.5g ZrO 2 Put it in a ball mill and mix it for 2 hours, put the mixed material into the calcination device, pass in nitrogen gas, sinter at 500°C for 8 hours and then cool it down, pulverize the cooled material in a mechanical pulverizer, and pass through a sieve The single-crystal nickel-cobalt-lithium manganese oxide composite material coated