Analysis of lithium battery homogenization equipment

Lithium battery homogenization equipment Now the mainstream homogenization equipment used by lithium battery manufacturers is a double planetary mixer. The dual planetary mixer, also known as the PD mixer, is used to work with a low-speed mixer, planetary, and a high-speed buffer disk for lithium. The low-speed mixing part consists of 2 folding rack-type mixing paddles, which are driven by planetary gears. The paddles rotate during rotation to move the material up and down, left and right, and then achieve the ideal mixing effect in a short time. The high-speed slacking part is usually a tooth-shaped slacking disk, which revolutionizes with the earth frame and rotates together at a high speed, so that the material suffers severe shearing and slacking effects. The effect is ordinary stirring several times, single slacking slacking part axis and double slacking axis. A) Single relaxation shaft b) Double relaxation shaft double planetary mixer slurry preparation is usually controlled by the shear force caused by hydrodynamics, and the shear force is controlled by the active shear rate, the cluster cross-sectional area and the hydrodynamic viscosity. Slurry preparation generally includes two processes: agglomerate crushing and suspension compounding. Cluster fragmentation is a messy process, which consists of three ways of wear, cracking and fracture, as shown in Figure 5. Cluster crushing depends on the mutual use of particles and particles, the mutual use of slurry solvent and particles, and the main shearing force, which depends on the viscosity and speed of the solvent. Abrasion usually occurs when the energy is low, and small fragments are gradually cut from larger objects under the abrasion application. When the mixing energy is high, the cluster splits into several parts. Fragmentation is a special modification of cracks in which clusters are divided into small pieces. The composite balance and relaxation rate of the cluster dominate the prediction of the equilibrium normal mode of the cluster. There is a critical normal mode under which the relaxation rate of the cluster is very small. It has been reported in the literature that under appropriate processing time and stirring energy, the slurry prepared by hydrodynamic shear stirring may not be less than 100 nanometers, so only when the particle size is not less than 100 nanometers, this type of agitation can completely relax the powder. Particle specifications. The complete disappearance of nanoparticles may not end. Therefore, this method is not suitable for the relaxation of nanometer data. In addition, surfactants can change the composition and relaxation balance of the agglomerates, which may make the size of the slurry clusters smaller. (a) The cluster crushing process shows its purpose, including three methods: abrasion, cracking and crushing; (b) particle size dispersion of the mixture. Ball mill mixing. Ball mill agitation is also commonly used to prepare lithium battery slurry, which is generally used in laboratories. Similar to the mixing method based on fluid mechanics, the relaxation ability of the ball mill technology is selected by the speed balance of the cluster crushing and the aggregation weight group, which is related to the properties of the powder particles and will change with the addition of surfactants. . In ball milling, powder particles undergo many changes in shape and volume, which may cause changes in mechanochemical data (such as particles, powders and loose media (solvents and binders), and even reactions between powder and grinding balls may occur. The high-shear turbulence of the knocking and part of the fluid also constitutes the cracked binder molecules. Ultrasonic mixing Now, based on the instantaneous acoustic cavitation effect, ultrasound is used for micro-mixing. This effect must occur under suitable high-intensity ultrasound, many Tiny bubbles are formed and grow. When the bubble size reaches a certain critical value, the growth rate of the bubbles increases rapidly, and then breaks instantly, forming a shock wave to relax the assembly, forming part of high temperature and high pressure (part of the pressure can reach thousands of atmospheres ). Another process of ultrasonic mixing is the microscopic activity of the liquid. The concentration of cavitation bubbles gradually decreases along the axis with the runner as the center, and the bubbles relax to the low-concentration area, driving the liquid activity, and the activity speed is as high as 2m/s. This This kind of fluid activity is sufficient to supply enough mixing without additional rated equipment. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.