Mixing machine for preparing graphite negative electrode material based on needle coke in coating process

Abstract

The invention provides a mixing machine for preparing a graphite negative electrode material based on needle coke in a coating process. The mixing machine comprises a tank body; the premixing treatment part is located on the upper portion in the tank body and comprises a liquid containing box and a rotary body, a conical material dispersing cavity is formed between the bottom face of the liquid containing box and the upper end face of the rotary body, and liquid outlet holes are evenly distributed in the upper portion of the conical material dispersing cavity; the shock excitation circulation mixing treatment part comprises a rotary shell, a conveying pipe and a shock excitation ring, and nozzles are uniformly distributed on the periphery of the rotary shell; the upper end of the conveying pipe feeds materials into the rotary shell, and the lower end is fixedly connected to the bottom in the tank body; two elastic sheets are vertically arranged at the lower end of the excitation ring to form an excitation cavity; and sprayed materials impact the excitation ring, fall into the material collecting ring groove and flow to the excitation cavity. The invention aims to disperse and pre-mix on a conical surface structure, and then deeply mix and coat in the cyclic treatment of centrifugal throwing-out impact dispersion and shock excitation microbubble removal, so that asphalt is fully embedded into the pore structure of the needle coke to improve the compaction density.

Description

technical field [0001] The invention relates to the technical field of graphite anode material production equipment, in particular to a mixer for preparing graphite anode material in the coating process based on needle coke. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, and separators. The negative electrode materials of lithium ion batteries in the related art are mainly carbon materials, mainly including natural graphite, artificial graphite, etc. Natural graphite has the advantages of high capacity and high compaction, and artificial graphite technology uses the surface modification and structure of the original material. Adjust to make it partially disordered or form nano-scale pores, holes and channels in various materials, increase lithium ion intercalation and deintercalation reactions, so it has the advantages of high compaction, high capacity, long life and so on. ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, needle coke powder with a certain particle size and high-temperature asphalt are mixed and coated under high temperature and pressure conditions, such as using a VC mixer for mixing and coating. However, in the actual coating process, there are some key points Due to the poor affinity between this kind of graphite powder and high-viscosity pitch, on the one hand, during the mixing process, too much needle coke powder is put in at one time, and it is difficult for the pitch to enter the powder for a long time, and it is easy to produce Agglomeration requires longer stirring time to mix and coat evenly; on the other hand, due to the existence of pores, holes, and channel structures in the material particles, the microbubbles in these pore structures are not easy to detach, making it difficult to embed asphalt materials. It can be coated on the surface of particles, even in a pressurized environment, it usually takes a long time to barely embed, and it is difficult to achieve the expected coating effect only by stirring in a pressurized environment. Therefore, this problem needs to be solved urgently

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