Lithium-ion battery cathode material precursor and preparation method thereof
A precursor and intermediate layer technology, applied in the field of modified high energy density lithium-ion battery cathode material precursor and its preparation, can solve the problems of poor performance of cathode materials, achieve excellent performance, easy to scale up, and suitable for large-scale applications Effect
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[0059] The preparation method of the precursor of the present invention comprises the following steps:
[0060] (a) provide the solution of Ni, Co, Mn three kinds of salts, prepare described core Ni x co y mn 1-x-y (OH) 2 , 0.5≤x≤1.0, 0≤y≤0.5;
[0061] (b) in the core Ni x co y mn 1-x-y (OH) 2 Deposit an intermediate layer on the surface, the intermediate layer is Zr(OH) 4 , Al(OH) 3 , Mg(OH) 2 , Fe(OH) 3 , Zn(OH) 2 、Cu(OH) 2 , Sr(OH) 2 、Co(OH) 2 , Ni(OH) 2 , Mn(OH) 2 one or a combination of two or more.
[0062] In another preferred example, in the step (a), the solutions of the three salts of Ni, Co, and Mn are added to the ammonia solution, and the pH value of the solution is adjusted to 7~14 to form a sedimentation to obtain the core Ni x co y mn 1-x-y (OH) 2 , 0.5≤x≤1.0, 0≤y≤0.5, the Ni salt is one or more of Ni sulfate, nitrate, chloride, acetate, and the Co salt is Co sulfate , nitrate, chloride, and acetate, and the Mn salt is one or more of sulfa...
Embodiment 1
[0088] Core Ni 0.5 co 0.2 mn 0.3 (OH) 2 preparation of
[0089] Prepare a mixed solution according to the molar ratio of Ni, Co, and Mn of 5:2:3, weigh nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate 131.52g, 56.12g, and 50.60g, and add 500mL of water to dissolve. Prepare 1000mL 4mol / L NaOH solution and 1000mL 2mol / L ammonia solution.
[0090] Add 200mL of water to the reactor under nitrogen protection, heat to 60°C, add the mixed solution, 4mol / L NaOH solution and 2mol / L ammonia solution into the reactor at the same time, and control the final pH of the solution at 9-14. After the solution is added, continue to stir and react for 24 hours. After the sedimentation is over, filter and wash the precipitate, and dry it at 80°C to obtain the core P1: Ni 0.5 co 0.2 mn 0.3 (OH) 2
Embodiment 2
[0092] The surface is Zr(OH) 4 , Ni inside 0.5 co 0.2 mn 0.3 (OH) 2 preparation of materials
[0093] Preparation ammonia concentration is that the solution of 1mol / L joins in the reactor, weighs the core Ni prepared in 100g embodiment 1 0.5 co 0.2 mn 0.3 (OH) 2 , added to the ammonia solution, stirred to form a dispersion.
[0094] Weigh 13.01g ZrO(NO 3 ) 2 , dissolved in 50mL water to obtain ZrO(NO 3 ) 2 solution. Under an air atmosphere, this solution and 2 mol / L ammonia solution were simultaneously added to the hydroxide dispersion. After the solution is added, continue to stir for 5-10 hours, filter, wash with deionized water for 3 times, and dry at 100°C for 5 hours to obtain a surface of Zr(OH) 4 , the interior is Ni 0.5 co 0.2 mn 0.3 (OH) 2 Material P2.
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