Coated positive electrode material of lithium-ion battery and preparation method of positive electrode material

Abstract

The invention discloses a coated positive electrode material of a lithium-ion battery. A matrix substance of the positive electrode material is a high-nickel positive electrode active material Li<delta>Ni<x>Co<y>M<z>O<2>; a layer of uniform coating is arranged on the surface of the matrix substrate; and the coating is a metal oxide and / or a lithium-ion conductor compound and accounts for 0.01%-10% of the mass of the matrix substrate. The invention further discloses a preparation method of the coated positive electrode material of the lithium-ion battery. The method comprises the steps of firstly, fully dissolving a soluble metal salt into deionized water to obtain a water solution of the soluble metal salt; adding the matrix substrate to the water solution of the soluble metal salt, mixing to obtain a turbid liquid, carrying out full stirring, filtering and drying and then burning to obtain the coated positive electrode material of the lithium-ion battery. The preparation method of the coated positive electrode material of the lithium-ion battery is suitable for the high-nickel positive electrode material; and in-situ coating is carried out on the surface of the matrix substance to form a uniform coating layer, so that the effects of reducing the pH value and improving the cycle performance of the positive electrode material are achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery cathode active material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of mobile phones and notebooks, various digital products using lithium-ion batteries have been updated and upgraded very quickly, and most of the products tend to be portable and economical; at the same time, in order to protect the ecological environment and ensure national energy security The strategic needs , Electric vehicles have become the focus of the development of new energy vehicles. With the development needs of electric vehicles and hybrid vehicles, higher requirements are put forward for the energy density of lithium-ion batteries. [0003] At present, lithium cobalt oxide is commonly used as the positive electrode material for high-energy-density lithium-ion batteries, and the compacted density and ...

AI Technical Summary

Problems solved by technology

This method is to directly dry the slurry without filtering. It is only suitable for positive electrode materials with low residual lithium on the surface such as lithium cobaltate, lithium manganese oxide, and low-nickel ternary positive electrode materials. For high-nickel positive electrode materials , this method cannot remove a large amount of residual lithium on the surface, and cannot reduce the pH value of the material

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