A kind of production method of natural needle coke composite graphite negative electrode material

Abstract

The invention provides a production method of a natural needle-coke composite graphite cathode material. According to the production method, needle coke serves as a raw material A, natural graphite serves as a raw material B, pitch micropowder serves as a raw material C, graphene conductive agent serves as a raw material D, and a carbon nano tube serves as a raw material E. The raw materials are subjected to mechanical processing, surface modification, deep chemical modification, doping and the like, and then, the cathode material, which is long in cycle life, high in charging and discharging rate, high in high-and-low temperature performance, good in processing performance and suitable for power batteries, is prepared. The cathode material is simple in production process, high in production efficiency, low in cost, safe in processing process and capable of being applied to industrial production. The production method has the advantages that through addition of a mixed material of the graphene conductive agent and the carbon nano tube, electricity conducting performance of the cathode material is improved; graphitization is performed in a coarse powder state, so that particle surface oxidation active points, oxidation degree and material loss rate can be reduced, and volume and yield of the cathode material can be increased.

Description

technical field [0001] The invention relates to a production method of a natural needle coke composite graphite negative electrode material, which belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] As an important source of vehicle power, lithium-ion batteries have the functions of saving energy and protecting the environment. The anode materials of lithium-ion batteries are the main research content of current researchers. How to better maximize the performance of batteries, save energy and reduce emissions, and optimize the environment plays a vital role in the development of social economy. At present, the anode materials of lithium-ion batteries within the scope of research are still mainly graphite. The ions are quickly inserted into the negative electrode. When more lithium ions are inserted and the insertion is faster, the charging capacity will be higher, the discharge capacity will be larger, and the ch...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a production method of natural needle coke composite graphite negative electrode material, to solve the problem of low capacity caused by the low degree of graphitization of single artificial graphite and the high degree of oxidation in the heat treatment process, to overcome the poor cycle of natural graphite, high and low temperature Performance and poor processing adaptability and other defects, while improving the electrical conductivity and rate performance of the material, etc.