DF series bead mill: Key equipment for the dispersion and grinding of new energy battery materials
In the field of new energy battery material preparation, dispersion and grinding technology is the core link that determines the material performance. Advanced materials represented by pool cathode materials, CNT conductive agents, and diaphragm coating materials have put forward strict requirements for particle fineness, dispersion uniformity, and process stability. The DF series bead mills of advanced technology, through innovative design, provide a breakthrough solution for the mass production of these high-value-added materials.
1. High flow processing and centrifugal discharge technology
Traditional sand mills often encounter problems such as clogged discharge and low efficiency in the treatment of battery slurry. The DF series adopts a static centrifugal discharge device. Its super-large discharge area design increases the flow rate by up to 40%, making it particularly suitable for continuous production of cathode material slurry with high solid content (over 70%). This technology classifies through the centrifugal force field and forms a dynamic screening effect at the discharge port, which can not only ensure the smooth discharge of ultrafine particles at the 0.1μm level, but also prevent the escape of grinding media. The actual tests of a ternary cathode material manufacturer show that under the same working conditions, the single-batch cycle of processing NCM811 slurry by the DF-300 equipment is shortened to 2.5 hours, increasing the production capacity by 35% compared with the traditional model.
2. a sealing system with dual safety guarantees
For the volatile NMP solvent (N-methylpyrrolidone) in the production of CNT conductive agents, the equipment is equipped with an intelligent double-end face mechanical seal system. The perfluoro sealing rings with German technology can withstand various strong polar solvents such as DMAC and acetone. Combined with the compatibility design of mechanical lubricating fluid and materials, the leakage risk is reduced to the ppm level. More importantly, the system can still maintain stable operation under a high-pressure working condition of 40Bar, which makes it possible to achieve high-efficiency grinding of silicon-carbon anode materials. The comparative data of a certain nanomaterial enterprise in Suzhou shows that after adopting this sealing system, the equipment can operate continuously for 2,000 hours without maintenance, and the solvent loss is reduced by 92%.
3. Wear-resistant Design and Lifespan Revolution
Hard particles such as lithium cobalt oxide and lithium iron phosphate in the cathode material cause significant wear to the equipment. The DF series grinding chamber is made of specially designed high-chromium-molybdenum alloy steel. After vacuum quenching treatment, the surface hardness reaches HRC62. Combined with nanocrystalline treatment technology, the service life of key components exceeds 8,000 hours. Compared with the common 304 stainless steel model, the metal pollution is reduced by 80% when grinding LiFePO4 material, fully meeting the strict standard of iron impurity content ≤50ppm for power battery materials. The actual measurement report of CATL's suppliers shows that after continuous production for six months, the particle size D50 of the equipment's output remains stable within the range of 0.8±0.05μm.
4. Breakthroughs in Thermal Management and Energy Efficiency Improvements
The segmented double spiral waterway design is the key to doubling the cooling efficiency. This structure changes the traditional single-channel cooling water route to a reverse double helix and increases the heat exchange area by 2.3 times by enhancing the turbulence effect. In the grinding of PVDF slurry used for diaphragm coating, the material temperature can be precisely controlled at 35±2℃ to prevent the degradation of polymer chains due to local overheating. The production data of a certain diaphragm enterprise in Guangdong confirmed that this cooling system increased the viscosity stability of PVDF slurry to 98%, and the Rz value of coating uniformity was better than 1.5μm.
5. Synergistic Optimization of Dispersion and Grinding Efficiency
The combined disperser group adopts a three-stage turbine-toothed disk structure and shows significant advantages in the treatment of CNT conductive agents. Its pre-dispersion unit can rapidly depolymerize carbon nanotube aggregates. Combined with a 0.1mm yttrium-stabilized zirconia grinding medium, the formation time of the conductive network is shortened by 60%. Byd's test report shows that the resistivity of the slurry adopting this technology has dropped to 82Ω·cm, improving the electrical conductivity by 30% compared with the traditional process. What is more worth noting is that the equipment supports online particle size monitoring and dynamic adjustment, and can achieve batch consistency with D90≤300nm.
Against the backdrop of the new energy industry's advancement towards the TWh era, the DF series bead mills have evolved into 12 specialized models through modular design. The full range coverage from laboratory type (5L) to mass production type (2000L), combined with the Internet of Things remote operation and maintenance system, is promoting the evolution of battery material production towards intelligence and zero defects. In the future, with the development of new systems such as semi-solid batteries and sodium-ion batteries, this technology platform that combines precision processing and scale-up will demonstrate greater value.
1. High flow processing and centrifugal discharge technology
Traditional sand mills often encounter problems such as clogged discharge and low efficiency in the treatment of battery slurry. The DF series adopts a static centrifugal discharge device. Its super-large discharge area design increases the flow rate by up to 40%, making it particularly suitable for continuous production of cathode material slurry with high solid content (over 70%). This technology classifies through the centrifugal force field and forms a dynamic screening effect at the discharge port, which can not only ensure the smooth discharge of ultrafine particles at the 0.1μm level, but also prevent the escape of grinding media. The actual tests of a ternary cathode material manufacturer show that under the same working conditions, the single-batch cycle of processing NCM811 slurry by the DF-300 equipment is shortened to 2.5 hours, increasing the production capacity by 35% compared with the traditional model.
2. a sealing system with dual safety guarantees
For the volatile NMP solvent (N-methylpyrrolidone) in the production of CNT conductive agents, the equipment is equipped with an intelligent double-end face mechanical seal system. The perfluoro sealing rings with German technology can withstand various strong polar solvents such as DMAC and acetone. Combined with the compatibility design of mechanical lubricating fluid and materials, the leakage risk is reduced to the ppm level. More importantly, the system can still maintain stable operation under a high-pressure working condition of 40Bar, which makes it possible to achieve high-efficiency grinding of silicon-carbon anode materials. The comparative data of a certain nanomaterial enterprise in Suzhou shows that after adopting this sealing system, the equipment can operate continuously for 2,000 hours without maintenance, and the solvent loss is reduced by 92%.
3. Wear-resistant Design and Lifespan Revolution
Hard particles such as lithium cobalt oxide and lithium iron phosphate in the cathode material cause significant wear to the equipment. The DF series grinding chamber is made of specially designed high-chromium-molybdenum alloy steel. After vacuum quenching treatment, the surface hardness reaches HRC62. Combined with nanocrystalline treatment technology, the service life of key components exceeds 8,000 hours. Compared with the common 304 stainless steel model, the metal pollution is reduced by 80% when grinding LiFePO4 material, fully meeting the strict standard of iron impurity content ≤50ppm for power battery materials. The actual measurement report of CATL's suppliers shows that after continuous production for six months, the particle size D50 of the equipment's output remains stable within the range of 0.8±0.05μm.
4. Breakthroughs in Thermal Management and Energy Efficiency Improvements
The segmented double spiral waterway design is the key to doubling the cooling efficiency. This structure changes the traditional single-channel cooling water route to a reverse double helix and increases the heat exchange area by 2.3 times by enhancing the turbulence effect. In the grinding of PVDF slurry used for diaphragm coating, the material temperature can be precisely controlled at 35±2℃ to prevent the degradation of polymer chains due to local overheating. The production data of a certain diaphragm enterprise in Guangdong confirmed that this cooling system increased the viscosity stability of PVDF slurry to 98%, and the Rz value of coating uniformity was better than 1.5μm.
5. Synergistic Optimization of Dispersion and Grinding Efficiency
The combined disperser group adopts a three-stage turbine-toothed disk structure and shows significant advantages in the treatment of CNT conductive agents. Its pre-dispersion unit can rapidly depolymerize carbon nanotube aggregates. Combined with a 0.1mm yttrium-stabilized zirconia grinding medium, the formation time of the conductive network is shortened by 60%. Byd's test report shows that the resistivity of the slurry adopting this technology has dropped to 82Ω·cm, improving the electrical conductivity by 30% compared with the traditional process. What is more worth noting is that the equipment supports online particle size monitoring and dynamic adjustment, and can achieve batch consistency with D90≤300nm.
Against the backdrop of the new energy industry's advancement towards the TWh era, the DF series bead mills have evolved into 12 specialized models through modular design. The full range coverage from laboratory type (5L) to mass production type (2000L), combined with the Internet of Things remote operation and maintenance system, is promoting the evolution of battery material production towards intelligence and zero defects. In the future, with the development of new systems such as semi-solid batteries and sodium-ion batteries, this technology platform that combines precision processing and scale-up will demonstrate greater value.
