Ternary positive electrode material precursor and preparation method thereof
A technology of cathode materials and precursors, which is applied in the field of preparation of ternary cathode material precursors, can solve the problems that detergents are difficult to reach precursor particles, cyclic side effects, and reduce battery capacity, etc., to achieve good morphology and reduce packaging effect of covering and improving reaction efficiency
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Embodiment 1
[0039] 1) Mix nickel sulfate aqueous solution, cobalt sulfate aqueous solution and manganese sulfate aqueous solution according to the molar ratio of 8:1:1 to obtain mixed metal salt solution (2.2mol / L);
[0040] 2) After introducing nitrogen into the reactor to replace the air in the reactor, adjust the stirring speed in the reactor to 400r / min, mix the above-mentioned mixed metal salt solution at a rate of 0.4L / h, and ammonia water (9mol / L) at a rate of 0.088L Add it dropwise to the reaction kettle at a speed of 1 hour, and control the dropping speed of aqueous sodium hydroxide solution (8mol / L) so that the pH value in the kettle is maintained at 12.0, and it is reacted at 65°C, and precipitation occurs during the reaction. thing;
[0041] 3) When the particle size D50 of the sediment increases to 10um, air is introduced into the reactor, and the specific surface area of the sediment reaches 15m after 50min 2 / g stop aeration, remove the solid obtained after centrifugatio...
Embodiment 2
[0045] 1) Mix nickel sulfate aqueous solution, cobalt sulfate aqueous solution and manganese sulfate aqueous solution according to the molar ratio of 83:12:5 to obtain mixed metal salt solution (2mol / L);
[0046] 2) After introducing nitrogen into the reactor to replace the air in the reactor, adjust the stirring speed in the reactor to 500r / min, mix the above-mentioned mixed metal salt solution at a rate of 0.2L / h, and ammonia water (14mol / L) at a rate of 0.018L Add it dropwise to the reaction kettle at a speed of 1 hour, and control the dripping speed of aqueous sodium hydroxide solution (9mol / L) so that the pH value in the kettle is maintained at 12.8, and react at 70°C, and precipitation occurs during the reaction. thing;
[0047] 3) When the particle size D50 of the sediment increases to 12um, air is introduced into the reactor, and the specific surface area of the sediment reaches 12m after 40min 2 / g stop aeration, remove the solid obtained after centrifugation to re...
Embodiment 3
[0050] 1) Mix nickel sulfate aqueous solution, cobalt sulfate aqueous solution and manganese sulfate aqueous solution according to the molar ratio of 70:15:15 to obtain mixed metal salt solution (2mol / L);
[0051] 2) After introducing nitrogen into the reactor to replace the air in the reactor, adjust the stirring speed in the reactor to 350r / min, mix the above-mentioned mixed metal salt solution at a rate of 0.45L / h, and ammonia water (10mol / L) at a rate of 0.069L Add it dropwise to the reaction kettle at a rate of 1 hour, and control the dropping speed of aqueous sodium hydroxide solution (8mol / L) so that the pH value in the kettle is maintained at 11.5, and react at 70°C, and precipitation occurs during the reaction. thing;
[0052] 3) When the particle size D50 of the sediment increases to 7um, air is introduced into the reactor, and the specific surface area of the sediment reaches 10m after 30min 2 / g stop ventilation, remove the solid obtained after centrifugation to...
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