Empowering precise mixing of lithium battery slurry to build the core foundation of high-energy batteries

Lithium battery slurry, as the core raw material for electrode manufacturing of power batteries, energy storage batteries, and high-end consumer batteries, directly determines the charging and discharging efficiency, rate performance, cycle life, and safety boundary of the battery based on its mixing quality. This slurry is composed of active materials, nano conductive agents (carbon nanotubes, graphene, etc.), binders, and solvents, and is widely used in key scenarios such as ternary high nickel power batteries, lithium iron phosphate energy storage batteries, and silicon-based negative electrode consumer batteries. Currently, with the iteration of lithium batteries towards high energy density, high voltage, and long cycle direction, the requirements for the dispersion uniformity, system stability, and bubble free properties of nano conductive agents in slurry mixing are becoming increasingly stringent. SMIDA planetary centrifugal mixer, with its core technological advantages, has become a key equipment for the preparation of high-quality lithium battery slurry.
The mixing of lithium battery slurry faces multiple industry pain points: firstly, the surface energy of nano conductive agents (such as carbon nanotubes) is high, which easily forms aggregates. Traditional stirring is difficult to completely break, resulting in "breakpoints" in the electrode conductive network and increasing the internal resistance of the battery; Secondly, uneven mixing of active substances, conductive agents, and binders can cause fluctuations in electrode performance, affecting batch consistency of batteries; Thirdly, during the preparation process of the slurry, it is easy to get involved in air, and if the small bubbles formed are not removed, it can lead to pinhole defects in the subsequent electrode pieces, and even pose a safety risk to the battery. In addition, the viscosity of different system slurries (oily PVDF slurry, water-based SBR/CMC slurry) varies greatly, which puts higher demands on the adaptability of mixing equipment.
The SMIDA planetary centrifugal mixer solves the above problems from the root by using a composite motion structure of "revolution+rotation". The equipment is driven by planetary gears to rotate the stirring blade at high speed while revolving around the center of the stirring cylinder, forming a strong shear flow field and centrifugal force field, which can efficiently tear the nano conductive agent aggregates, promote the molecular level uniform mixing of active substances, conductive agents and binders, and ensure the uniform particle size distribution of the slurry (Span value stable below 0.8), laying the foundation for building a dense and continuous electrode conductive network. For the pain points of bubbles, the equipment is equipped with a high-precision vacuum system, which can maintain a stable vacuum environment of ≤ -0.09MPa. The air in the slurry is discharged in real time throughout the mixing process, and the pinhole defects of the polarizer are eliminated from the source. At the same time, the device is equipped with an intelligent temperature control module, which can accurately control the slurry temperature within the optimal mixing range of 25-40 ℃, adapting to the preparation needs of lithium battery slurry with different viscosities and systems.
Whether it is large-scale production of power battery enterprises or research and development of high value-added slurries in laboratories, SMIDA planetary centrifugal mixers can be flexibly adapted. It can accurately match diverse needs such as ternary high nickel positive electrode slurry, silicon-based negative electrode slurry, and lithium iron phosphate energy storage battery slurry. Through automated parameter adjustment (speed, vacuum degree, temperature), it greatly improves production efficiency and slurry batch consistency, helping lithium battery enterprises break through performance bottlenecks and empowering the development of high-end fields such as new energy vehicles and energy storage power stations.