High-capacity and high-rate composite graphite negative electrode material preparation method

Abstract

The invention relates to the technical field of a lithium ion battery negative electrode materials, particularly to a high-capacity and high-rate composite graphite negative electrode material preparation method, which comprises: carrying out low-temperature carbonization on an artificial graphite particle material, crushing to achieve a particle size of 8-11 [mu]m, carrying out room temperature surface modification on the raw ball of mesophase carbon microspheres, mixing the two obtained materials and a binder, carrying out secondary coating modification granulation, and carrying out high temperature graphitization treatment to obtain the high-capacity and high-rate composite graphite negative electrode material. Compared with the material in the prior art, the material of the present invention has the following advantages that the disadvantages of poor rate of artificial graphite and low capacity of mesophase carbon microspheres are overcome, and the prepared product has advantages of high capacity and high rate charge and discharge performance. With the prepared product of the present invention, the single particle and the secondary coated particle are stacked and filled throughthe prepared product, the directional distribution of the particles is increased, the bounce of the electrode sheet is low, rebounds small, the electrolytic solution is smoothly inserted into the carbon and graphite material, and the cycle performance is excellent.

Description

technical field

[0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing a composite graphite negative electrode material with high capacity and high rate. Background technique

[0002] With its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and pollution-free, lithium-ion batteries have successfully replaced other secondary batteries and become the preferred choice for small electronic products such as mobile phones, notebook computers and video recorders. It is the main energy source, and has greatly promoted the industrialization process of electric vehicles. Many countries have also fully launched the development of lithium-ion batteries in the military and aerospace fields, which puts forward higher requirements for lithium-ion batteries.

[0003] With the development of science and technology, electronic product...

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