A method for preparing spherical nickel cobalt lithium aluminate precursor based on the regulation of nuclear growth mechanism

Abstract

The invention discloses a method for preparing a spherical nickel cobalt lithium aluminate precursor based on a regulation and control nucleus growth mechanism. According to the method, a nucleus growth process is regulated and controlled, and a whole precursor growth process is divided into four periods including a mother nucleus dispersion period, a nucleus growth environment regulation period, a crystal grain rapid growth period and a crystal grain stable growth period. By providing a mother nucleus of an ion attachment point, a condition that the growth of crystal grains is too slow, caused by a high nucleation rate of ions, can be avoided; a nucleus growth environment is regulated during the crystal grain growth period, so that the crystal grains form a spherical structure effectively, and the reduction of a material capacity and a circulating performance, caused by the fact that a lamellar aggregate is formed, is not caused. The nickel cobalt lithium aluminate precursor prepared by the method disclosed by the invention has the advantages of uniform particle size distribution, good spherical degree, high gram capacity and good circulating performance.

Description

technical field [0001] The invention relates to a method for preparing a spherical nickel-cobalt-lithium aluminate precursor based on a mechanism of regulating nuclear growth. Background technique [0002] Since the development and utilization of lithium battery energy by Sony Electric Corporation of Japan, the production of lithium batteries has driven the rapid development of the entire lithium battery industry. Compared with traditional batteries, lithium batteries are clean and pollution-free. More importantly, its advantages of high capacity and no memory effect just cater to the needs of contemporary electronic products. Its replacement undoubtedly promoted the development process of the entire electronics industry. Lithium batteries have gone through the upgrading of lithium iron phosphate, lithium cobalt oxide, and lithium nickel oxide materials. Researchers have found that ternary materials doped with nickel cobalt and the third type of metal elements have the adv...

AI Technical Summary

Problems solved by technology

This method solves the problem of structural inhomogeneity of the nickel-cobalt-aluminum core-shell structure prepared by Chinese CN 103715424 A, and utilizes the nuclear growth mechanism to regulate the four stages of grain growth: mother nucleus dispersion period, mother nucleus environment period, The rapid grain growth period and the stable grain growth period can effectively avoid the phenomenon that the grains have a high nucleation rate and slow growth in the initial stage, and the phenomenon that the grains grow too fast to form lamellar aggregates in the later stage, and can prepare uniform particle size distribution and good sphericity. Nickel-cobalt-aluminum precursor, after sintering, LiNi with high capacity and good cycle performance can be obtained x co y Al 1-x-y o 2 Cathode material

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