Preparation method of ternary precursor and ternary precursor, positive electrode material, lithium ion battery

Abstract

The invention provides a preparation method of a ternary precursor, a ternary precursor, a positive electrode material, and a lithium-ion battery, and relates to the technical field of metallurgy, including: (a) preparing a ternary precursor crystal seed in a first reaction kettle; (b) preparing a ternary precursor slurry by using the ternary precursor crystal seed; (c) obtaining a ternary precursor. The method of the invention has low requirements on production equipment, can be produced on a large scale, has high efficiency and stable product quality. The primary particles on the surface of the secondary spherical particles of the ternary precursor provided by the present invention are regularly arranged and loose and porous, especially gaps are generated between the primary particles. The cathode material can be prepared by using the ternary precursor. Thus, the cathode material can be used to prepare lithium-ion batteries, which can increase the diffusion channels of lithium ions, and can significantly improve the first charge and discharge performance, cycle performance and rate performance of the battery.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation method of a ternary precursor, a ternary precursor, a positive electrode material, and a lithium ion battery. Background technique [0002] The ternary precursor is a highly customized standard product of the ternary cathode material, and is a key material for the production of the ternary cathode. The performance of the ternary precursor directly determines the main physical and chemical properties of the ternary cathode material, such as particle size, element ratio, and impurity content, thereby affecting the core electrochemical properties of the lithium battery such as consistency, rate performance, energy density, and cycle life. The most common synthesis method of the ternary precursor is the co-precipitation method, which is formed from a mixed solution of nickel, cobalt, and manganese salts, under the protection of ammonia water as a complexing agent, so...

AI Technical Summary

Problems solved by technology

The prepared lithium-ion battery will increase with the increase in the number of lithium battery cycles. The primary particles in the secondary ball have different crystal plane orientations and slip planes, and the anisotropy of lattice expansion and contraction between crystal grains leads to the increase in the cycle time. In the later stage, there may be broken, pulverized, and structural collapse caused by secondary particle expansion or shrinkage, increased battery impedance, reduced active components, and intensified side reactions with the electrolyte, resulting in severe capacity fading, and a sharp drop in rate and cycle performance.

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