Graphite powder shaping machine, mechanical force modification, modification depolymerization machine

Release time:

2024-12-13 08:53

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Graphite plays a crucial role as an anode material for lithium batteries. With the rapid development of industries such as artificial intelligence, big data, 5G communications, and electric vehicles, the performance requirements for lithium-ion batteries are increasing. Graphite anodes have become one of the key components of lithium-ion batteries due to their high specific capacity and lower platform voltage. However, graphite anodes also have some issues. For example, graphite has poor compatibility with electrolytes, and during the charging and discharging process, large solvent molecules often co-insert with lithium ions into the graphite layers, causing the graphite layers to expand and peel off, reducing battery capacity and lifespan. At the same time, the unevenness of the graphite surface makes it difficult to form a uniform and dense SEI film during the first charge and discharge process, resulting in low initial charge and discharge efficiency and poor cycling performance.

To address these issues, coating modification machines play a key role in graphite processing. Surface coating can cover the active sites on the surface of natural graphite, reduce the occurrence of irreversible side reactions, decrease the specific surface area of natural graphite, and suppress the formation of the SEI film, isolating graphite particles from the electrolyte, preventing solvent co-insertion that leads to capacity decline, and providing constraints and buffering effects on the volume expansion of graphite, thereby increasing cycling stability. The working efficiency of coating modification machines is high, allowing for significant improvements in graphite modification.

For example, the "honeycomb mill" demonstrates mature stability and multifunctionality in the coating modification process. The honeycomb mill is specifically designed for the production of ultrafine powders with strict requirements on particle size distribution, advocating for depolymerization before drying. It can simultaneously achieve material grinding, drying, sorting, and chemical surface treatment of powders, while also drying and depolymerizing wet grinding filter cakes and slurries. Its main unit consists of an air volume chamber, a mixing chamber, and several crushing chambers. During operation, the depolymerization wheel is driven at high speed, and the nano powder material to be modified and hot air enter the honeycomb mill's air volume 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 depolymerization functions. The powder particles are crushed and dried simultaneously, and after isolation of large and small particles, the small particles sequentially enter the crushing chamber. The depolymerization wheel in the crushing chamber operates at a high speed of 160 meters/second, and the surface energy of agglomerated nano powder particles is lower than the centrifugal force of high-speed rotation, thus fully dispersing and depolymerizing the powder particles. At this time, the modifier is injected into the mixing chamber in liquid form through multiple inlets with the help of compressed air. The liquefied modifier makes uniform and sufficient contact with the fully dispersed nano particles in the mixing chamber, and the surface modifier is highly dispersed on the surface of the powder particles through chemical reactions, forming a strong and complete membrane layer. The surface coating process for graphite is very mature, with high output, suitable for industrial production.

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