Ternary cathode material and preparation method thereof
A cathode material and doping element technology, applied in the field of ternary cathode material and its preparation, to achieve the effect of improving process performance, simple preparation process and excellent cycle stability
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[0028] refer to figure 1 , the embodiment of the present invention proposes a preparation method of a ternary cathode material, wherein the general formula of the ternary cathode material is LiNi (1-x-y-z) co x mn y m z o 2 , x+y+z0, y>0, M is a doping element, including:
[0029] S1: Add lithium salts, nickel salts, cobalt salts, manganese salts, and doping element salts to the first specified solvent in a certain proportion, and obtain reaction solution A by magnetic stirring; mix a certain amount of organic compound The solid is added to the second part of the solvent, and the reaction solution B is obtained by magnetic stirring;
[0030] S2: Pour the reaction solution B into the reaction solution A under magnetic stirring according to a certain volume ratio, react for a certain period of time under continuous stirring, and filter with suction to obtain a wet gel;
[0031] S3: pre-sintering the wet gel in a specified atmosphere to obtain a precursor, taking out the pr...
Embodiment 1
[0048] Dissolve 1.10mol of lithium chloride, 0.75mol of nickel chloride, 0.1mol of cobalt chloride, 0.1mol of manganese chloride and 0.05mol of aluminum chloride in 0.5L of N,N-dimethylformamide and stir for 30 minutes , to obtain reaction solution A.
[0049] Take 0.05mol of terephthalic acid and dissolve it in 0.5L of N,N-dimethylformamide, and stir for 30 minutes to obtain reaction solution B.
[0050] Add the reaction solution B to the reaction solution A under magnetic stirring, react under continuous stirring for 10 minutes, and then send it to vacuum filtration to obtain a wet gel, and the filtrate obtained by suction filtration can be recycled for use.
[0051] The obtained wet gel was pre-sintered at 700°C for 4 hours in a nitrogen-oxygen mixed atmosphere with a nitrogen mass content of 90%, cooled to room temperature, taken out and ground, and then heat-treated at 750°C for 15 hours under an oxygen atmosphere. Obtain ternary cathode material LiNi 0.75 co 0.1 mn 0...
Embodiment 2
[0054] Take 1.075mol of lithium sulfate, 1.2mol of nickel sulfate, 0.4mol of cobalt sulfate, 0.35mol of manganese sulfate and 0.05mol of zirconium sulfate and dissolve them in 0.5L of N,N-dimethylacetamide, and stir for 30 minutes to obtain reaction solution A .
[0055] Dissolve 0.1 mol of isophthalic acid in 0.5 L of N,N-dimethylacetamide, and stir for 30 minutes to obtain reaction solution B.
[0056] Add the reaction solution B to the reaction solution A under magnetic stirring, and react under continuous stirring for 15 minutes, then send it to vacuum filtration to obtain a wet gel, and the filtrate obtained by suction filtration can be recycled for use.
[0057] The obtained wet gel was pre-sintered at 600°C for 4 hours in a nitrogen-oxygen mixed atmosphere with a nitrogen content of 92%, cooled to room temperature, taken out and ground, and heat-treated at 800°C for 12 hours in an air atmosphere to obtain Ternary cathode material LiNi 0.6 co 0.2 mn 0.175 Zr 0.025 o...
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