Manufacturing method of graphite box plate for negative electrode material graphitization box-type furnace

Abstract

The invention discloses a manufacturing method of a graphite box plate for a negative electrode material graphitization box-type furnace, which comprises the following steps: step A, fully graphitized coke is used as a raw material, and asphalt is used as an adhesive; step B, mixing and kneading the graphitized coke and asphalt into a paste material; step C, adding the paste into a mold, and then carrying out vacuum preloading vibration to obtain a raw product; step D, demolding and cooling the raw product, and performing primary roasting through a car bottom furnace to obtain a graphite box plate material; and step E, processing and forming the graphite box plate material to obtain the graphite box plate for the negative electrode material graphitization box-type furnace. Compared with the prior art, the manufacturing cost is greatly reduced, the machining cutting performance is good, the process yield is high, the problems of the internal structure of the product and the asphalt amount are solved, the risk of primary baking quality is reduced, the product percent of pass is increased, the production period is greatly shortened, and the production cost is reduced. The product quality is improved.

Description

technical field [0001] The invention relates to the field of graphite products, in particular to a method for manufacturing a graphite box plate for a graphitization box furnace of a negative electrode material. Background technique [0002] Artificial graphite anode material is an essential material for 3C, power, and energy storage lithium-ion batteries at this stage. In recent years, the new energy power battery and energy storage market has developed rapidly, driving the demand for artificial graphite anode materials to increase sharply. In 2021, domestic production of artificial graphite will begin. The total negative electrode production capacity is about 500wt. [0003] The artificial graphite anode material must be graphitized to complete the crystallization of the microstructure. The current mainstream technology is the traditional Acheson crucible furnace and the new box-type graphitization furnace. Compared with the crucible furnace, the box-type furnace has highe...

AI Technical Summary

Problems solved by technology

[0004] Under the existing technology, all the materials of the box furnace box are basically graphitized plates, which need to be processed through forming, first baking, graphitization, and processing, and the manufacturing cost is very high, especially in the case of the recent shortage of graphitization resources. and cost pressures are very high

[0005] Under the existing technology, calcined petroleum coke or mixed coke of calcined petroleum coke and graphitized coke is basically used in the industry as raw material, and it is formed by extrusion. The rate is low; the quality risk of the first roast is high, and the occurrence rate of internal cracks is high

[0006] Under the existing technology, products extruded with calcined petroleum coke must undergo graphitization treatment to meet the performance requirements of the finished product. The high cost of graphitization treatment leads to high manufacturing costs

[0007] Under the existing technology, similar products are roasted once in the traditional ring furnace, the temperature difference is large, coupled with the high demand for asphalt for extruded products containing graphitized coke, and the high probability of internal potential defects, resulting in a high risk of the quality of the first roast , products prone to internal crack defects

[0008] Under the existing technology, there are also some manufacturers who try to use the technical route of direct processing of baked products. Calcined petroleum coke is used as raw material, and the product is directly processed after extrusion molding and first baked. Because the material has not undergone graphitization crystal structure transformation, the hardness is high. , the processing is difficult, the cost of processing tool consumables is very high, and the processing efficiency is low

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