Negative electrode material active coating machine composite modification machine shaping stirring mill

Release time:

2024-12-09 09:17

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Negative electrode materials are an important component of lithium-ion batteries, playing a key role in storing and releasing lithium ions. Together with positive electrode materials, they determine the performance and lifespan of the battery. In lithium batteries, the quality of negative electrode materials directly affects key indicators such as energy density, cycle life, and safety.Coating modification is necessary to improve the comprehensive performance of negative electrode materials. Firstly, negative electrode materials often have some natural defects, such as the strong heterogeneity of natural graphite surfaces and the presence of many active sites, which can lead to solvent co-insertion during lithium ion intercalation, making it difficult to form a uniform and dense SEI film during the first charge. Additionally, the poor wettability with the electrolyte can cause graphite layer delamination during charge and discharge, resulting in a short cycle life. Silicon-based anodes experience significant volume changes during lithium extraction and insertion, leading to structural collapse and powdering or delamination of the electrode sheets. Through coating modification, a protective layer can be built on the outer layer of the negative electrode material to improve its performance.

Coated negative electrode materials form a core-shell structure of carbon materials, which can prevent the co-insertion of lithium ions and solvents, suppress electrolyte decomposition, and enhance the initial reversible capacity, cycle stability, and rate performance of the negative electrode materials. At the same time, it protects the negative electrode materials from electrolyte wetting and corrosion, reduces the risk of internal short circuits and thermal runaway in the battery, maintains stability over a wide temperature range, and preserves good electrochemical performance. For example, using coating technology to modify natural graphite can effectively improve its cycling performance and rate capability; carbon coating on silicon-based anodes can buffer the stress changes caused by silicon volume expansion, maintaining the integrity of the electrode structure and improving the conductivity of silicon-based negative electrode materials. The honeycomb mill is mature and stable in the coating modification process, serving as a powder surface coating modification machine suitable for carbon coating, with a coating rate of up to 99.2%.

It can simultaneously achieve material grinding, drying, sorting, and chemical surface treatment of powders. The minimum processing capacity is 0.05 tons per hour, and the maximum is 15 tons per hour, with a maximum water evaporation capacity of tons per hour.

The entire honeycomb mill continuous depolymerization modification process operates under negative pressure, with a high degree of continuity, no dust pollution, enabling large-scale production, and is easy to operate, runs smoothly, and has low labor intensity. It is an effective device for improving the comprehensive performance of negative electrode materials and has significant importance for promoting the development of the lithium battery industry. 99.2%，能同步实现物料研磨、干燥、分选以及粉末的化学表面处理。处理量最小0.05吨/小时，最大15吨/小时，水分蒸发量最大3吨/小时。极高的深度干燥能力，超细粉体通过高温和高速旋转，在数秒内实现粉体中0.5%的残余水份就几乎完全蒸发和分离，使最终含水量可达到0.05‰的深度干燥水平。

整个蜂巢磨连续解聚改性工艺过程在负压下操作，连续化程度高、无粉尘污染，可实现规模化生产，且操作简便、运行平稳、劳动强度低。是提高负极材料综合性能的有效设备，对于推动锂电池行业的发展具有重要意义。

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