Nickel-cobalt lithium aluminate precursor preparation method
A technology of nickel cobalt lithium aluminate and precursor, which is used in chemical instruments and methods, nickel compounds, electrode manufacturing, etc. problems, to achieve the effect of facilitating large-scale industrial production, ensuring product quality, and simple process
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[0029] Please refer to figure 1 , The present invention provides a method for preparing a lithium nickel cobalt aluminate precursor, which includes the following steps:
[0030] 1) According to the molar ratio of Ni:Co:Al=(0.6-0.9):(0.05-0.3):(0.01-0.1), the nickel salt solution, cobalt salt solution and aluminum salt solution are mixed to form the first mixed solution;
[0031] 2) Adding the first mixed solution to ammonia water with a mass fraction of 5%-25%, and after stirring evenly, adjust the pH value with an alkaline solution to form a second mixed solution with pH ≥ 12;
[0032] 3) Add an appropriate amount of additives to the second mixed solution, stir evenly and then stand and age for 10-24 hours to form a precursor colloid;
[0033] 4) Wash the precursor colloid with distilled water first, then wash with alcohol liquid, and then concentrate by centrifugation to obtain a precursor gel;
[0034] 5) Dry the precursor gel at 200-300°C for 4-8 hours, and then calcinate at 1100-16...
Embodiment 1
[0037] In this embodiment, equal volumes of nickel chloride solution, cobalt chloride solution and aluminum chloride solution with concentrations of 0.9 mol / L, 0.3 mol / L and 0.1 mol / L are mixed to form a first mixed solution; The first mixed solution is added to ammonia water with a mass fraction of 25%, stirred evenly at a high speed of 4500r / min, and then the pH value is adjusted with NaOH solution to form a second mixed solution with pH=12; to the second mixed solution Add an appropriate amount of additives, where the added amount of the additives is 0.05% relative to the mass fraction of the second mixed solution, then stir evenly at a high speed of 4500r / min, then stand and age for 24h to form a precursor colloid; The precursor colloid is washed with distilled water and absolute ethanol in turn, and then concentrated by centrifugation to obtain a precursor gel; the precursor gel is dried at 300°C for 8 hours, and then calcined at 1600°C for 6 hours to obtain precursor powde...
Embodiment 2
[0039] In this embodiment, equal volumes of nickel chloride solution, cobalt chloride solution, and aluminum chloride solution with concentrations of 0.6 mol / L, 0.05 mol / L, and 0.01 mol / L are mixed to form a first mixed solution; The first mixed solution was added to ammonia water with a mass fraction of 5%, stirred uniformly at a high speed of 4500r / min, and then the pH value was adjusted by NaOH solution to form a second mixed solution with pH=12; to the second mixed solution Add an appropriate amount of additives, wherein the added amount of the additives is 0.01% relative to the mass fraction of the second mixed solution, and then stir evenly at a high speed of 4500r / min and then stand and age for 10 hours to form a precursor colloid; The precursor colloid was washed with distilled water and anhydrous ethylene glycol in turn, and then concentrated by centrifugation to obtain a precursor gel; the precursor gel was dried at 200°C for 4 hours, and then calcined at 1100°C for 3 ...
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Abstract
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