Lithium ion battery cathode material and preparation method thereof

Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof, which lower the cost of the lithium ion battery cathode material and improve the high-energy density thereof. The lithium ion battery cathode material takes more than one of natural crystalline graphite, natural cryptocrystalline graphite and natural crystalline vein graphite as matrixes, a non-graphitic carbon material is coated outside the matrixes, and the coated particles are compounded with a conductive material. The preparation method of the lithium ion battery cathode material comprises the following steps of mixing and drying a liquid phase, carbonizing, carrying out high-temperature treatment and compounding. Compared with the prior art, the graphite with lower carbon content is taken as a raw material to greatly reduce the raw material cost; by adopting a hot air drying mode, the preparation process is simplified and a coating layer is more solid and compact; and by adopting lower carburizing temperature and the temperature for high-temperature heat treatment, energy consumption is reduced, and product cost is further lowered.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery carbon negative electrode material and a preparation method thereof. Background technique [0002] The method of preparing lithium-ion battery carbon negative electrode materials in the prior art is to use high-purity spherical graphite as a raw material, its carbon content is as high as 99.9%, and its shape is close to spherical. The complex preparation process is used to process graphite, including multi-phase coating, doping etc., the product yield is lower, below 50%, these methods inevitably make the cost of negative electrode material increase, have influenced the process that lithium-ion battery develops to power battery. In addition, existing products and related preparation methods cannot overcome the shortcomings of low specific capacity and low compaction density of negative electrode materials, which affect...

AI Technical Summary

Problems solved by technology

[0002] The method of preparing lithium-ion battery carbon negative electrode materials in the prior art is to use high-purity spherical graphite as a raw material, its carbon content is as high as 99.9%, and its shape is close to spherical. The complex preparation process is used to process graphite, including multi-phase coating, doping etc., the product yield is low, less than 50%, these methods inevitably increase the cost of negative electrode materials, and affect the development process of lithium-ion batteries to power batteries

In addition, existing products and related preparation methods cannot overcome the shortcomings of low specific capacity and low compaction density of negative electrode materials, which affects the further improvement of the energy density of lithium-ion batteries.

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