A kind of preparation method and product of spherical nickel-cobalt-manganese precursor material

Abstract

The invention discloses a spherical nickel cobalt manganese precursor material and a preparation method thereof. The preparation method comprises the following steps: mixing a nickel cobalt manganese ion mixture solution, a complexing agent and a precipitating agent, adding the obtained mixture into a matrix generating reaction kettle in a continuous feeding and discharging manner, and carrying out a reaction in an inert atmosphere at a controlled reaction solution temperature, a controlled pH value and a controlled complexing agent concentration to obtain a matrix slurry; and adding the matrix slurry to a granule growth reaction kettle, mixing the nickel cobalt manganese ion mixture solution, the complexing agent and the precipitating agent, adding the obtained mixture into the granule growth reaction kettle in a continuous feeding manner, and carrying out a reaction in the inert atmosphere at a controlled temperature in the kettle, a controlled reaction solution pH value and a controlled concentration of the complexing agent in the reaction solution in order to obtain a slurry containing the spherical nickel cobalt manganese precursor material. The method can improve the production efficiency, and is suitable for continuous industrial production, and the obtained product has centralized particle size distribution and contains few fine particles.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a preparation method and product of a spherical nickel-cobalt-manganese precursor material with concentrated particle size distribution. Background technique [0002] In recent years, the new energy vehicle industry has developed rapidly, and lithium-ion batteries are considered to be one of the ideal energy storage devices for new energy vehicles due to their excellent electrochemical characteristics. At present, lithium-ion battery materials mainly include lithium cobaltate, lithium manganate, nickel-cobalt lithium manganate and lithium iron phosphate. Among them, lithium nickel cobalt manganese oxide has broad application prospects in the field of power batteries due to its large specific capacity, good storage performance and environmental friendliness, and is gradually favored by the new energy automobile industry. [0003] With the continuous improvem...

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Problems solved by technology

The continuous process will inevitably lead to a certain number of small particles with a particle size below 1 μm in the precursor material, and it will also lead to a wide particle size distribution, resulting in different crystallinity between fine particles and large particles, and differences in primary particles. ; while the batch process can effectively control the number of small particles and reduce the particle size distribution, the process conditions are extremely harsh and the control means are extremely complicated, so it is difficult to achieve large-scale industrial production, and in the existing batch process, the particles grow to After the target particle size, the reaction must be stopped. This intermittent batch production affects the production efficiency, cannot realize continuous production, and cannot guarantee the consistency requirements between batches, and has little practical value.

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