In-situ coating method of high-nickel ternary material

Abstract

The invention relates to an in-situ coating method of a high-nickel ternary material, and belongs to the technical field of anode materials of lithium ion batteries. The in-situ coating method of the high-nickel ternary material comprises the following processing steps of (1) acid treatment: adding anode material powder into an acid solution to carry out soaking acid treatment; (2) drying treatment: filtering, washing and drying the anode material powder which is subjected to the acid treatment; (3) sodium source preparation: adding a sodium source in the dried anode material according to a mass ratio of 1:(0.002 to 0.007), and uniformly mixing the anode material with distilled water according to a volume ratio of 1:(0.8 to 1.2); (4) spray drying: carrying out spray drying on a mixed solution in a spray drying machine; (5) sintering treatment: sintering dried powder in air atmosphere under 600 to 900 DEG C, wherein the sintering time is 2 to 5 hours; sieving after sintering, thus obtaining a product. The in-situ coating method disclosed by the invention has the advantages that the technology is simple, the reduction of the capacity and the rate capability of a battery is restricted, the cycle performance of the battery is increased, and the like.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to an in-situ coating method for high-nickel ternary materials. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, and good safety performance, so they are widely used in mobile phones, Mobile devices such as digital cameras and laptops. With the development of science and technology, most products tend to be portable and economical, which requires lithium-ion battery products to develop in the direction of high energy density. [0003] At present, the widely used lithium cobalt oxide has shortcomings such as shortage of resources and high price, and the space for further improving the energy density of lithium cobalt oxide...

AI Technical Summary

Problems solved by technology

However, during the cycle of the layered ternary material battery, due to the erosion and catalysis of the electrolyte, with the continuous insertion and extraction of lithium ions, a large number of NiO cubic phases will be generated on the surface of the high-nickel ternary material; high-potential discharge above 4.5V , it will accelerate the formation of NiO cubic phase on the surface of the material and the collapse of the material structure

Due to the low conductivity of NiO cubic phase electrons and lithium ions, the battery impedance will rise sharply, resulting in technical problems such as the reduction of capacity and rate performance of high-nickel ternary material batteries, and poor cycle performance.

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