High-nickel ternary precursor with core-shell structure, preparation method of high-nickel ternary precursor, and hollow doped high-nickel ternary positive electrode material
A core-shell structure and precursor technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low initial capacity, unstable cycle structure, poor conductivity of high-nickel NCM, etc., to improve the internal structure and easy to design. Assembly and structure regulation, and the effect of facile preparation
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Embodiment 1
[0042] The preparation of a high-nickel ternary precursor with a core-shell structure includes the following steps:
[0043] (1) The concentration of zinc nitrate is adjusted and controlled at 2mol / L; the concentration of 2-methylimidazole is adjusted and controlled at 4mol / L;
[0044] (2) Slowly add the uniformly stirred metal salt solution into the 2-methylimidazole solution, stir for 30min, and let stand for 24h;
[0045] (3) The Zn-MOF was washed by centrifugation, dried at 80°C for 8 hours, and then soaked in 0.1mol / L boric acid solution for 6 hours;
[0046] (4) Industrial 28% ammonia water is mixed with deionized water and the concentration is adjusted to be 10mol / L; NaOH is mixed with deionized water to adjust the concentration to be 4mol / L;
[0047] (5) dissolving soluble nickel nitrate, cobalt nitrate, and manganese nitrate with a molar ratio of Ni:Co:Mn=7:2:1 and a total concentration of 2mol / L in hot water at 70°C, and stirring until completely dissolved;
[0048...
Embodiment 2
[0058] The preparation of a high-nickel ternary precursor with a core-shell structure includes the following steps:
[0059] (1) The concentration of zinc nitrate is adjusted and controlled at 2mol / L; the concentration of 2-methylimidazole is adjusted and controlled at 4mol / L;
[0060] (2) Slowly add the uniformly stirred metal salt solution into the 2-methylimidazole solution, stir for 30min, and let stand for 24h;
[0061] (3) The Zn-MOF was washed by centrifugation, dried at 80°C for 12h, and then soaked in 0.05mol / L boric acid solution for 10h;
[0062] (4) Industrial 28% ammonia water is mixed with deionized water and the concentration is adjusted to be 10mol / L; NaOH is mixed with deionized water to adjust the concentration to be 4mol / L;
[0063] (5) dissolving soluble nickel nitrate, cobalt nitrate, and manganese nitrate with a molar ratio of Ni:Co:Mn=6:2:2 and a total concentration of 2mol / L in hot water at 70°C, and stirring until completely dissolved;
[0064] (6) P...
Embodiment 3
[0069] The preparation of a high-nickel ternary precursor with a core-shell structure includes the following steps:
[0070] (1) The concentration of zinc nitrate is adjusted and controlled at 1.5mol / L; the concentration of 2-methylimidazole is adjusted and controlled at 3mol / L;
[0071] (2) Slowly add the uniformly stirred metal salt solution into the 2-methylimidazole solution, stir for 15 minutes, and let stand for 20 hours;
[0072] (3) The Zn-MOF was washed by centrifugation, dried at 100°C for 6h, and then soaked in 0.02mol / L boric acid solution for 24h
[0073] (4) Industrial 28% ammonia water is mixed with deionized water and the concentration is adjusted to be 10mol / L; NaOH is mixed with deionized water to adjust the concentration to be 4mol / L;
[0074] (5) dissolving soluble nickel sulfate, cobalt sulfate, and manganese sulfate with a molar ratio of Ni:Co:Mn=8:1:1 and a total concentration of 2mol / L in hot water at 70°C, and stirring until completely dissolved;
[...
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