Graphitization furnace and graphitization production method for synthetic graphite negative electrode material

Abstract

The invention discloses a graphitization furnace and a graphitization production method for a synthetic graphite negative electrode material. The furnace body of the graphitization furnace is of a case structure with an open upper end; the open end of the furnace body is sealed with a furnace lid; conductive electrodes are installed on two opposite side walls of the furnace body; and a plurality of graphite current-conducting plates are distributed in the furnace body. The graphitization production method does not use a material container or material boat and directly places a raw material to be graphitized into a hearth for graphitization instead, so the charging amount of the material can be increased and output is increased by 25%; heat loss is small during heating, power consumption is greatly reduced, and unit power consumption of the graphitization furnace is reduced by at least 1000 kw / h compared with common furnaces; the periphery in the graphitization furnace is not filled with a thermal insulation material, so introduction of impurities in discharging is avoided, and product purity is high; concentrated guiding of flue gas for treatment is carried out, tailings are recycled, clean energy production is realized, and the degree of environmental protection is improved by 95% or above; and an air cooling system is utilized, the furnace body is simple in structure, and water resources are saved.

Description

technical field [0001] The invention relates to the technical field of carbon negative electrode materials for lithium ion batteries, in particular to a graphitization device and method for artificial graphite negative electrode materials. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high working voltage, good safety, and no memory effect, and are widely used in many portable electronic devices such as notebook computers, mobile phones, and instruments. In recent years, with the continuous improvement of electronic products, vehicle-mounted and energy storage equipment for miniaturization, light weight, multi-function, and long-term driving, the requirements for high energy density, high rate performance, and long cycle life of lithium-ion batteries constantly improving. Artificial graphite has significant advantages such as high capacity, long cycle life, and stable performance after ultra-high temperature ...

AI Technical Summary

Problems solved by technology

[0004] However, the existing production method of the inner series graphitization furnace also has unsatisfactory parts: the first is that the negative electrode material needs to be filled with a material container or a material boat, because the material container or the material boat is an auxiliary tool for heating and cooling together with the negative electrode material. Tools consume a lot of heat in the graphitization process, resulting in a significant increase in the cost of graphitization

Second, in order to keep warm and prevent the materials in the furnace from oxidizing, the surroundings of the furnace are filled with thermal insulation materials of petroleum coke powder. When the materials are discharged, the thermal insulation materials will be difficult to clean and impurities will be introduced, resulting in low product purity.

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