High-tap-density high-nickel ternary precursor as well as preparation method and application thereof

Abstract

The invention provides a high-tap-density high-nickel ternary precursor and a preparation method and an application thereof. The preparation method of the ternary precursor comprises the steps that a,a salt solution and a complexing solution are continuously added to the bottom of a reactor, and when the particle size D50 of a current precursor reaches 10-12 [mu]m, controlling the pH value of a reaction system to be 11.10-11.50; b, controlling the pH value of the reaction system to be 10.50-10.90 when the particle size D50 of the current precursor reaches 8-10 [mu]m; and repeating the step aand the step b for multiple times to obtain the high-tap-density high-nickel ternary precursor with the particle size D50 of 8-12 [mu]m and the tap density of 2.4-2.5 g / mL, thereby solving the problems of difficulty in controlling the size of the precursor, low tap density and the like in the prior art. According to the preparation method of the ternary material precursor, ammonia gas and waste liquid in a system are recycled, sodium sulfate in the system is separated out through cooling crystallization to be used as a by-product, and resource comprehensive utilization of three wastes is achieved.

Description

technical field [0001] The invention relates to high-nickel ternary precursor technology, in particular to a high-tap-density high-nickel ternary precursor, its preparation method and application. Background technique [0002] As a new generation of rechargeable high-energy batteries, lithium-ion secondary batteries have the advantages of high energy, good safety performance, long service life, low pollution, no memory effect, and low cost of electricity. They are widely used in mobile phones, digital cameras, and notebook computers. , instrumentation, electric vehicles and many other fields. [0003] In the whole composition of the lithium-ion secondary battery, the cathode material occupies a very important position, and its performance directly determines the performance of the final product, and its price also directly affects the cost of the lithium-ion secondary battery. The cathode materials of lithium-ion secondary batteries that are currently on the market mainly i...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a high-tap-density high-nickel precursor for the problems that the current nickel ternary precursor preparation process cannot be continuously carried out, the energy consumption is large, the three wastes cannot be effectively utilized, and the tap density of the prepared ternary precursor is low. The preparation method of the ternary precursor, which has scientific and reasonable steps and can be continuously prepared, realizes zero discharge of "three wastes", and the high-nickel ternary precursor prepared by this method has a higher tap density

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