Graphite Coating Disperser Ultra-fine Disperser Active Coating Machine

Release time:

2024-12-14 08:58

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The coating modification machine plays a key role in improving the rate performance and cycling performance of graphite anode materials. By coating a layer of amorphous carbon or other modified materials on the surface of graphite, the diffusion performance of lithium ions in the anode material can be improved. For example, the interlayer spacing of amorphous carbon materials is larger than that of graphite, providing a smoother transmission channel for lithium ions, thereby enhancing high current charge and discharge performance. At the same time, the coating layer can prevent solvent molecules from co-inserting into the graphite layers, reducing the expansion and peeling of the graphite layers, effectively improving the cycling performance of the anode material.

Taking artificial graphite as an example, using the coating treatment method, the artificial graphite is ground into powder, and in the carbonization furnace and graphitization furnace, it is coated with high-temperature pitch according to a certain heating curve, forming a layer of amorphous carbon on the surface of the artificial graphite. This process can significantly improve the surface defects of artificial graphite, playing a role in surface repair and enhancing its electrochemical performance. The treated artificial graphite anode material exhibits more stable performance during charge and discharge processes, with significant improvements in rate performance and cycling performance.

In the modification of natural graphite, liquid phase coating methods, such as atmospheric pressure liquid phase coating and vacuum liquid phase coating, can effectively avoid the agglomeration of ultrafine pitch powder and the problem of uneven coating. After coating, a layer of amorphous carbon coating is formed on the surface of the graphite, which not only maintains the spherical morphology and average size but also reduces the specific surface area and increases the interlayer spacing, facilitating lithium ion transport and improving cycling stability and capacity.

BeeThe honeycomb mill, as a continuous composite modification machine, plays an important role in graphite processing. Its modification principle is to generate vortices through the motion of mechanical energy, dispersing and deagglomerating the graphite particles. During operation, the deagglomeration wheel is driven at high speed, and the nano powder material to be modified and hot air enter the honeycomb mill's airflow chamber through the material inlet. In the drying chamber, high-temperature gas generates drying, rapidly evaporating the free water on the surface of the nano powder particles while also having a deagglomeration function. The powder particles are crushed and dried, and after isolation of large and small particles, the small particles sequentially enter the crushing chamber. The deagglomeration wheel in the crushing chamber operates at a speed of 160 meters per second, and the surface energy of agglomerated nano powder particles is lower than the centrifugal force of high-speed rotation, thus fully dispersing and deagglomerating the powder particles. At the same time, the modifier is fully atomized and coated on the surface of the graphite particles, forming a layer of nano film. The mixing and modification process between the material and the modifier can be completed within 3 to 5 seconds, with a coating rate of up to 99.2% and an activation rate of 99.8%, making it very suitable for large-scale industrial production. 160 米 / 秒的速度高速运转，纳米粉体颗粒团聚的表面能低于高速旋转的离心力，因此粉体颗粒被充分打散解聚。同时，将改性剂充分雾化，并包覆在石墨颗粒表面，形成一层纳米薄膜。物料与改性剂在3～5s之内能完成混合改性过程，包覆率可达 99.2%，活化率达 99.8%，非常适合大规模工业化生产。

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