Preparation method of continuous Ni-Co-Al ternary precursor

Abstract

The invention relates to a preparation method of a continuous Ni-Co-Al ternary precursor. The preparation method comprises the steps of preparing a metal salt solution of a certain concentration, an aluminum alkali, liquid sodium hydroxide and an ammonia solution; adding into a reaction kettle for reaction, wherein the liquid sodium hydroxide is added into the reaction kettle via an upper liquid inlet tube, the aluminum alkali is added into the reaction kettle via a lower liquid inlet tube, and the upper liquid inlet tube and the lower liquid inlet tube are connected in parallel to the reaction kettle; opening an overflowing valve so that a reaction liquid flows into an aging groove for aging until an internal liquid level of the reaction kettle is flush with the overflowing valve when a liquid level in the reaction kettle is raised to be approximate to a reaction kettle cover, and closing the overflowing valve; repeating accordingly; and washing and drying the aged product to obtain the Ni-Co-Al ternary precursor. By a method of the liquid sodium hydroxide injected via the two liquid inlet tubes, a part of liquid sodium hydroxide is guided into the reaction kettle via the upper liquid inlet tube, the pH in an existing technical reaction can be locally reduced, the crystal nucleus can be obviously reduced, the D0 is improved, and the overflowing valve is adjusted to be an intermittent opening state from a normally-open state.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of a continuous nickel-cobalt-aluminum ternary precursor. Background technique [0002] With the continuous development of my country's economy and technology, the use of energy has also increased, especially the rapid development of industry, which consumes a lot of battery energy, and the harmful substances produced are likely to cause damage to the ecological environment. Therefore, the country puts forward higher requirements on the use of energy, not only to improve the efficiency of energy use, but also to achieve energy conservation and emission reduction, and to strengthen the purpose of natural ecological protection. Therefore, it is extremely important to improve the structure of battery energy devices, especially the preparation of high-purity battery energy materials. [0003] At present, the production method of the nickel-cobalt-mangane...

AI Technical Summary

Problems solved by technology

In the continuous production process, the particle size distribution is normal from small to large, and small particles will always exist in the reaction process, but when downstream customers use ternary precursors containing small particles, there will be a problem of high material viscosity Although it is not sensitive to this phenomenon in the low-end market, it is a product defect of "one-vote veto" in the high-end market

And in the process of continuous preparation of the ternary precursor, the reaction kettle is fed and overflowed at the same time. The reason for the generation of small particles is that the raw material liquid that has just entered the reaction kettle undergoes a precipitation reaction, and the small particles generated are in the reaction kettle. If the residence time is too small, the stool overflows before it grows up, thus reducing the product quality