Positive electrode material powder grinder, powder ball mill, powder crusher

Release time:

2024-12-02 09:29

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Currently, the mainstream lithium battery cathode materials globally include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials. These cathode materials need to undergo a series of processing and preparation before being applied to downstream industries, and particle size preparation is a key part of this process. Typically, vertical grinders such as 'cell mills' are used for processing. For lithium iron phosphate, due to the small diffusion coefficient of lithium ions in the material and the large size of non-nanoparticles, the performance at high currents is limited, necessitating nanonization. The vertical grinder 'cell mill' can achieve wet grinding of materials, offering stable performance, high efficiency, low energy consumption, and low noise, and can process lithium iron phosphate to a particle size below 100 nanometers, providing advantages such as stable particles and narrow particle size distribution, significantly improving the performance of lithium iron phosphate. For instance, the small size effect of nanoparticles reduces the depth and distance of lithium ion insertion and extraction, ensuring that capacity does not degrade during high current discharge, and the increased specific surface area enhances the reaction interface.

For lithium manganese oxide, a high-temperature solid-phase method is used during production, and the vertical grinder can grind lithium manganese oxide to an appropriate particle size, enhancing its performance as a cathode material in industries such as communications, power tools, and power batteries. At the same time, lithium manganese oxide is widely used in the new energy industry, and the vertical grinder can help meet the high performance requirements of the industry. The vertical grinder primarily enhances the performance of cathode materials through particle refinement and uniform mixing. In terms of particle refinement, when particles are reduced to the nanoscale, the diffusion path of lithium ions within the active material particles can be significantly reduced for efficient extraction and insertion, improving the rate performance of the corresponding battery. For example, for lithium iron phosphate cathode materials, ordinary ball mills struggle to crush the precursor's particle size to a very small range, while the vertical grinder uses high-hardness zirconia beads to grind and disperse the material under high-speed stirring, achieving nanoscale particle size levels. Additionally, nanonization can also increase the specific surface area of active particles, enhancing the reaction surface with the electrolyte to improve performance. In terms of uniform mixing, the vertical grinder can continuously disperse and mix materials while refining and crushing them, promoting uniform mixing of the precursor and controlling particle size. Ultimately, this results in a finer particle size and a more uniform distribution of nano lithium iron phosphate products.

立式研磨机主要通过细化颗粒和均匀混合等方式提升正极材料的性能。在细化颗粒方面，颗粒缩小至纳米尺寸后，可以显著减少锂离子在正极活性物质颗粒内部的扩散路径，以便高效脱嵌，提高对应电池的倍率性能。例如，对于磷酸铁锂正极材料，普通球磨机难以将前驱体的粒径粉碎至极小的范围，而立式研磨机采用高硬度氧化锆珠子，在高速搅拌状态下对物料进行研磨分散，能够将前驱体研磨至纳米粒径的水平。同时，纳米化也能提高活性颗粒的比表面积，即提高与电解液的反应表面，以使性能得到提升。在均匀混合方面，立式研磨机在细化粉碎物料的同时，能够对物料进行不间断的分散和混合，促进前驱体的混合均匀以及粒径控制。最终获得粒径更细、分布更均匀的纳米磷酸铁锂产品。

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