Application of three-eccentric mixer in mixing negative electrode materials (graphite) for lithium batteries

I. Technical requirements for mixing negative electrode materials for lithium batteries

The mixing process of negative electrode materials (graphite) for lithium batteries has extremely high requirements for uniformity and dispersion. Graphite powder has the characteristics of small particle size and easy agglomeration, and needs to be accurately proportioned with binders, conductive agents and other components during the mixing process. Traditional mixing equipment (such as dual-axis three-dimensional and V-type mixers) often leads to local agglomeration of materials and poor batch consistency due to capacity limitations and single mixing trajectory, which makes it difficult to meet the production requirements of high-energy-density lithium batteries.

II. Technical advantages and adaptability of three-eccentric mixers

1. Multi-directional dislocation cross motion to achieve high uniformity mixing
The three-eccentric mixer uses a three-way structural design of radial, axial, and upper and lower eccentricity to make the barrel produce six-way asymmetric irregular motion trajectories. When applied to graphite mixing, this movement can break the agglomeration structure of graphite powder and promote its uniform dispersion with binders and other components under the cross action of different flow rates and flow directions. According to actual measurements, the mixing uniformity of the equipment can reach more than 99%, which is much higher than that of traditional equipment, ensuring the consistency of the components of the graphite electrode slurry and improving the stability of the charging and discharging performance of lithium batteries.
2. Large capacity and high loading efficiency are suitable for large-scale production
The capacity of traditional three-dimensional mixers is usually limited to 20~2000 liters, while the three-eccentric mixer has a unique barrel design (upper barrel cone, middle barrel polygon/ellipse, lower barrel eccentric cone), and the loading factor can reach more than 80%, and the single batch mixing capacity can be expanded to 10,000 liters. This feature perfectly adapts to the large-scale production needs of lithium battery negative electrode materials, reduces batch differences, and reduces energy consumption and production costs.
3. Low wear and easy-to-clean structural design
The equipment barrel connection adopts arc transition, without material residual dead corners, and is equipped with a patented online cleaning device (patent number: ZL201520326448.2), which can quickly complete the inner wall cleaning and avoid cross-contamination of different batches of graphite materials. In addition, the three-eccentric structure reduces the hard friction between the material and the equipment, reduces the risk of particle size damage of the graphite powder, and maintains the original physical and chemical properties of the material.
4. Intelligent and energy-saving characteristics optimize the production process
The equipment is equipped with a patented transmission mechanism (patent number: ZL201520326612.X), which runs smoothly and has a noise level of less than 75dB. With the online vacuum suction device (patent number: ZL201520326407.3), it can achieve fully enclosed material transportation, reduce the flying of graphite dust, and improve the safety of the workshop environment. At the same time, the energy consumption is lower than that of traditional equipment, which meets the green manufacturing needs of lithium battery production.

III. Application scenarios and practical value

The practice of a leading lithium battery company shows that after using this equipment, the mixing time of graphite negative electrode materials is shortened, the batch yield is improved, and the equipment maintenance cost is reduced. The product’s design that meets GMP standards also provides a reliable equipment foundation for the research and development and production of high-precision negative electrode materials such as solid-state batteries in the future.

Summary: The triple-eccentric mixer, with its unique three-way eccentric design and multi-dimensional technical advantages, accurately solves the problems of uniformity, efficiency and cleanliness in the mixing process of lithium battery negative electrode materials (graphite), and has become one of the key equipment to promote the high performance and large-scale production of lithium batteries.