Method of preparing carbon anode active material of lithium-ion battery

Abstract

The invention relates to a method of preparing carbon anode active material of lithium-ion battery. The prepartion method includes following steps: a materials selection step, selecting heavy products of coal tar processing, heavy products of petroleum processing, heavy products of hydrocarbon polycondensation or, one or multiple of their low-temperature carbonization products as materials; a crushing step, crushing materials obtained from the material selection step into micro-particles with an average grain diameter of 3-80 Mum and granularity distribution range of 0-160 Mum; a thermal chemistry reforming step, in inert atmosphere, the micro-particles obtained by the crushing step is thermal chemistry reformed in moving state; a carbonization or carbonization, graphitization step, products from the thermal chemistry reforming step is proceeded with carbonization or carbonization, graphitization. The lithium-ion battery of carbon anode active material prepared by using the invention is provided with advantages of stable quality, excellent circulation performance, outstanding antidamping ability, high volume electrochemicalspecific capacity.

Description

technical field

[0001] The invention relates to a preparation method of a lithium ion battery carbon negative electrode active material. Background technique

[0002] At present, the practical lithium-ion battery anode materials are still mainly carbon-based materials, which are divided into two categories: artificial graphite and natural graphite according to the source or base. Hard carbon materials are negative electrode active materials that were found earlier to have better cycle characteristics. This feature is almost not affected by the charge and discharge rate. However, due to the major defect of high irreversible capacity loss, they have not been put into application.

[0003] In the existing typical carbon negative electrode active material manufacturing technology, there is a two-stage modification process for natural graphite, that is, firstly treat the natural graphite raw material mechanically to increase its apparent density and improve its morphology; then ...