Negative electrode material and preparation method thereof and lithium ion battery

Abstract

The invention relates to the technical field of lithium-ion battery materials, and specifically provides a negative electrode material, a preparation method thereof, and a lithium-ion battery. The negative electrode material provided by the invention includes graphite, conductive carbon black, binder, dispersant and thickener. The ratio of raw materials of the negative electrode material is reasonable, the amount of functional substances such as binders is reduced, and the weight ratio of graphite, the main material of the negative electrode, is increased. The negative electrode material has low porosity, high hardness and high diffusion coefficient, and a compact internal structure, which can maintain good structural stability during charging and discharging, while ensuring smooth ion channels on the surface and inside of the negative electrode material. In the method for preparing the above-mentioned negative electrode material provided by the present invention, the above-mentioned negative electrode material with excellent low-temperature performance is prepared by applying relatively high shearing force. The lithium-ion battery provided by the present invention uses the above-mentioned negative electrode material, and the lithium-ion battery can work normally and have stable performance in a low-temperature environment of -20°C.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, as the development of lithium-ion batteries has become more and more mature, its application range has become more and more extensive because of its advantages such as light weight, long life and high specific energy. As the application range of lithium-ion batteries is becoming wider and wider, the environment in which lithium-ion batteries are used is becoming more and more complex, and the performance requirements for lithium-ion batteries are also getting higher and higher, especially in environments with relatively low temperatures in winter. Lithium-ion batteries are required to work normally at temperatures of -20°C or even lower. [0003] However, the low-temperature performance of lithium-ion batteries is relatively ...

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a negative electrode material to alleviate the problems in the prior art that the negative electrode material has poor structural stability in a low temperature environment, and the ion channel is not smooth, which affects the low temperature performance of the battery.

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