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

Abstract

The invention provides a preparation method of a ternary precursor, the ternary precursor, a positive electrode material and a lithium ion battery, and relates to the technical field of metallurgy, and the preparation method comprises the following steps: (a) preparing a ternary precursor seed crystal in a first reaction kettle; (b) preparing ternary precursor slurry by utilizing the ternary precursor seed crystal; and (c) obtaining the ternary precursor. The method is low in requirement for production equipment, capable of achieving large-scale production, high in efficiency and stable in product quality. Primary particles on the surfaces of secondary spherical particles of the ternary precursor provided by the invention are regularly arranged and are loose and porous, and particularly gaps can be generated between primary particles. The ternary precursor can be used for preparing a positive electrode material. The positive electrode material can be used for preparing a lithium ion battery, a lithium ion diffusion channel can be increased, and the first charge-discharge performance, cycle performance and rate capability of the battery can be remarkably improved.

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...

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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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