Preparation method of nickel-cobalt-manganese precursor with controllable particle size distribution

Abstract

The invention discloses a preparation method of a nickel-cobalt-manganese precursor with controllable particle size distribution. The preparation method comprises the following steps: adjusting ammonia concentrations and pH values in a reaction vessel 1 and a reaction vessel 2; adding a nickel-cobalt-manganese salt solution, an alkaline solution and ammonia water into the reaction vessel 1; overflowing the slurry in the reaction vessel 1 into the reaction vessel 2, adding a nickel-cobalt-manganese salt solution, an alkaline solution and ammonia water into the reaction vessel 2, and starting ultrasonic treatment; and when the solid content in the reaction vessel 2 reaches 450 g / L-550 g / L, taking the slurry at different heights in the reaction vessel 2 to test the particle size, pumping out the slurry with a particle size target at the corresponding height, and conducting washing, drying and screening to obtain nickel-cobalt-manganese precursors with different particle sizes. According to the preparation method, two reaction vessels are adopted to realize the precursor with controllable particle size distribution and high degree of sphericity, the precursor is good in morphology, and the preparation method can control the particle size distribution between target values under the condition of continuous reaction, is easy to control, and is more suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, and more specifically relates to a preparation method of a nickel-cobalt-manganese precursor with controllable particle size distribution. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles, and hybrid vehicles due to their high energy density, long cycle life, no memory effect, and high electrochemical performance. Ternary nickel-cobalt-manganese batteries have become the development trend of battery materials in the field of new energy in the future due to their higher capacity, better cycle performance and excellent rate performance. [0003] Precursors with uniform particle size distribution have better cycle performance and high temperature performance. The grain nucleation and growth conditions in the precursor synthesis process are different, resulting in uneven particle size distribution of the prepare...

AI Technical Summary

Problems solved by technology

[0003] Precursors with uniform particle size distribution have better cycle performance and high temperature performance. The grain nucleation and growth conditions in the precursor synthesis process are different, resulting in uneven particle size distribution of the prepared nickel-cobalt-manganese precursor. Due to insufficient growth time, large specific surface area and high activity of small particles, the high temperature performance and cycle performance of the final nickel cobalt lithium manganese oxide will be poor

Therefore, it is difficult to obtain nickel-cobalt-manganese precursor materials with controllable particle size distribution and good morphology under the existing process conditions.

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