Graphite anode disintegrating equipment, powder disperser, composite modifying machine

Release time:

2025-04-14 07:00

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The surface of natural graphite exhibits significant heterogeneity and abundant active sites, leading to facile solvent co-intercalation during lithium-ion intercalation. This issue not only hinders the formation of a uniform and dense solid electrolyte interface (SEI) film during the first charge but also results in poor electrolyte wetting. In addition, the graphite layers are prone to shedding during charge-discharge cycles, further shortening the battery's cycle life. To overcome these defects, modifying natural graphite has become an industry consensus. Common modification methods include coating, SEI film modification, and heteroatom doping.

In the field of industrial production, dry-process pitch carbon coating modification technology has become an important process in commercial production. This process uses a honeycomb mill as the core equipment and modifies the graphite through the following steps: First, pitch with a softening point above 200℃ is thoroughly kneaded with natural graphite particles, so that the pitch is uniformly wrapped on the surface of the graphite particles. Subsequently, carbonization treatment is carried out in an inert atmosphere or under air-isolated conditions, which promotes the conversion of pitch into a carbon layer, forming a stable coating structure.

The unique design of the honeycomb mill gives this process several advantages: Highly efficient mixing Under negative pressure or normal pressure conditions, the pitch can quickly dissolve in the honeycomb mill chamber, making full contact with the graphite powder, ensuring uniform mixing. ； Multifunctionality The equipment can simultaneously apply two or more coating media, providing possibilities for diversified modification schemes. ； Process Diversification ： Not only can it produce high-quality pitch carbon-coated graphite anode materials, ， but it can also carry out drying depolymerization, spheroidization, and other processes.

After treatment with the honeycomb mill process, the performance of natural graphite is significantly improved: Optimized interfacial compatibility The wettability of graphite and electrolyte is greatly improved, effectively reducing the interfacial mass transfer resistance. ； Enhanced cycle stability The uniform carbon coating can inhibit the shedding of graphite layers, extending the cycle life of the battery. ； Improved rate performance The modified graphite anode exhibits superior performance under high-current charge-discharge conditions, meeting the needs of high-power applications.

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