Surface modified lithium ion battery anode material and preparation method thereof

Abstract

The invention discloses a surface modified lithium ion battery anode material and a preparation method thereof. The preparation method comprises the following steps: (1) fully mixing a lithium ion battery anode material with one or more types of metal acetates; (2) heating the mixture obtained in the step (1) to a temperature 1 to ensure that the low-melting-point acetate in the mixture reaches a molten or co-molten state, and complete infiltration and complete coating are realized on the surface of the anode material; and (3) further heating to a temperature 2 to ensure that the metal acetate coating layer on the surface of the anode material is decomposed into a metal oxide coating layer and metal ions are diffused to the inside of the material to form a doped modified layer, thereby obtaining the surface modified lithium ion battery anode material. According to the preparation method disclosed by the invention, the melting and uniform coating of the metal acetates on the surface of the anode material are realized, the metal acetate coating layer is decomposed and converted into the oxide coating layer and is diffused to form the surface doped modified layer, the process is simple, the cost is relatively low, and the operation is convenient.

Description

technical field

[0001] The invention relates to the field of lithium-ion battery materials, in particular to a surface-modified lithium-ion battery cathode material and a preparation method thereof. Background technique

[0002] Lithium-ion battery technology has made great progress since Japan's Sony Corporation successfully produced commercial lithium-ion batteries in 1991. Due to its high energy density, high power density, long cycle life, no pollution and low self-discharge rate, the application field of lithium-ion batteries has gradually expanded to power tools, electric vehicles, Emerging fields such as energy storage power stations, and have extremely broad application prospects.

[0003] Cathode material is the most critical component of lithium-ion batteries. It is the source of Li+ in lithium-ion batteries, directly determines its energy density, and is also an important factor affecting battery power density, cycle life and safety performance. During the charg...