Single-crystal high-nickel ternary material precursor and preparation method, preparation method of single-crystal high-nickel ternary material
A high-nickel ternary material and precursor technology, applied in chemical instruments and methods, nickel compounds, electrical components, etc., can solve the problem of difficulty in obtaining dense precursors, inability to obtain single single crystal particles, and reducing the electrochemical performance of materials, etc. It can eliminate oxygen defects, avoid the influence of particle shape and performance, and achieve the effect of small diffusion and mass transfer resistance.
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[0028] The second aspect of the present invention provides a method for preparing a single crystal high-nickel ternary material precursor, comprising the following steps:
[0029] a. Precursor core Ni x coy M1 (1-x-y) CO 3 Preparation of:
[0030] Dissolve the Ni source, Co source and M1 source in deionized water to obtain an aqueous solution, mix the aqueous solution, carbonate solution, and ammonia water, control the pH=9-12, and react at a constant temperature of 60-90°C for 3-12h, Cool to 25-30°C and filter to obtain the precursor core Ni x co y M1 (1-x-y) CO 3 , the M1 is selected from Mn, Al,
[0031] b. Preparation of the precursor of the core-shell structure:
[0032] In the precursor core Ni x co y M1 (1-x-y) CO 3 Ni source, Co source, M1 source, ammonia water and NaOH solution were added and mixed, the pH was controlled at 10-12, and a constant temperature reaction was performed at 60-65°C. After filtering and washing, a precursor with a core-shell struct...
Embodiment 1
[0050] A single crystal high-nickel ternary material precursor, with a core-shell structure, and the core material is Ni 0.6 co 0.2 mn 0.2 CO 3 , the shell material is Ni 0.6 co 0.2 mn 0.2 (OH) 2 , the D50 of the core-shell structure is 3um, and the D50 of the core is 1um.
[0051] Its preparation method is:
[0052] a. Precursor core Ni 0.6 co 0.2 mn 0.2 CO 3 Preparation of:
[0053] Dissolve metal Ni, Co, and Mn sulfates in deionized water to obtain an aqueous solution. Mix the aqueous solution, sodium carbonate solution, and ammonia water in a reactor in parallel, control the pH of the reactor to 11, and react at a constant temperature of 80°C 10h, then cooled to 25°C and filtered to obtain Ni 0.6 co 0.2 mn 0.2 CO 3 Seed crystal, particle size D50 is 1um,
[0054] b. Preparation of the precursor of the core-shell structure:
[0055] In the precursor core Ni 0.6 co 0.2 mn 0.2 CO 3 Add metal Ni, Co, Mn sulfate solution, morphology control agent ammonia, ...
Embodiment 2
[0057] A single crystal high-nickel ternary material precursor, with a core-shell structure, and the core material is Ni 0.8 co 0.1 mn 0.1 CO 3 , the shell material is Ni 0.8 co 0.1 mn 0.1 (OH) 2 , the D50 of the core-shell structure is 3um, and the D50 of the core is 1um.
[0058] Its preparation method is:
[0059] a. Precursor core Ni 0.8 co 0.1 mn 0.1 CO 3 Preparation of:
[0060] Dissolve metal Ni, Co, and Mn sulfates in deionized water to obtain an aqueous solution. Mix the aqueous solution, sodium carbonate solution, and ammonia water in a reactor in parallel, control the pH of the reactor to 11, and react at a constant temperature of 80°C 10h, then cooled to 25°C and filtered to obtain Ni 0.8 co 0.1 mn 0.1 CO 3 Seed crystal, particle size D50 is 1um,
[0061] b. Preparation of the precursor of the core-shell structure:
[0062] In the precursor core Ni 0.8 co 0.1 mn 0.1 CO 3 Add metal Ni, Co, Mn sulfate solution, morphology control agent ammonia, ...
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