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The dry mixing technology of electrode
Dry mixing process is a very important method in the preparation of electrode materials. Compared with the wet mixing process, the dry mixing process avoids the use of solvents in the treatment process, and has the advantages of simple operation, environment-friendly and low cost. In this paper, the dry mixing process of the electrode will be introduced in detail. The specific process includes dry powder mixing of active substances, conductive agents and binders, wetting by adding appropriate amount of solvent, high-speed dispersing and crushing after adding solvent, and finally dilution to adjust viscosity.
Overview of dry mixing process
The dry mixing process is a process in which the components of electrode materials are mixed in the form of dry powder. The process mainly includes the mixing of active substances, conductive agents and binders, and the performance and consistency of the electrodes can be effectively improved by controlling the operating conditions of each step. The dry mixing process is suitable for a variety of electrode materials, especially in the case of high requirements for environment-friendly and resource-saving, it shows its advantages.
The basic process of electrode dry mixing
Dry powder mix
In the first step of the dry mixing process, the active substance (such as lithium cobalt oxide, lithium iron phosphate, etc.), conductive agent (such as carbon black, conductive polymer) and binder (such as polyvinylidene fluoride, PVDF) are weighed in a certain proportion before dry powder mixing. This step is usually carried out by an efficient mixer, such as a V-type mixer or a planetary mixer, to ensure that the components are fully uniform and avoid component separation or agglomeration. The uniformity of dry powder mixing is directly related to the performance of the electrode.
Add appropriate amount of solvent to wet
Subsequently, an appropriate amount of solvent (such as N-methylpyrrolidone, NMP) is added to the thoroughly mixed dry powder. This process aims to enhance the wettability between the components through the liquid phase medium in order to facilitate subsequent dispersion. The choice of solvent and the amount of addition should be adjusted according to the properties of the electrode material and the viscosity requirements of the final slurry. The purpose of wetting is to destroy the strong interaction between the powder particles, so that the particle surface is fully in contact with the solvent.
After adding solvent, it is dispersed and broken at high speed
Upon completion of wetting, the mixture is transferred to a high-speed disperser for processing. In this process, the high-speed agitation of the equipment will make the particles rapidly dispersed and broken in the liquid phase, thus forming a more delicate and uniform slurry. Reasonable dispersion time and rotation speed are the key to ensure the uniformity of the mixture, and are also effective measures to improve the performance of the slurry.
Dilution adjustment viscosity
Finally, the dispersed slurry may need to be diluted according to the actual coating requirements. In this step, the appropriate amount of solvent is added to adjust the viscosity of the slurry to meet the operating standards of the coating equipment. In the dilution process, attention should be paid to the uniformity of the slurry to ensure that the newly added solvent is fully mixed with the slurry.
the advantages of dry mixing process
The dry mixing process has the following significant advantages:
Reduced solvent use: Compared to wet mixing, dry mixing significantly reduces the amount of solvent used, helping to reduce production costs and environmental pollution.
Simple operation: dry process is simple, less operation steps, suitable for mass production.
Optimized material properties: Through proper mixing and dispersion, dry mixing can improve the compatibility between materials and help to enhance the conductivity and cycle stability of the electrode.
Reduced drying costs: Energy consumption and costs for subsequent drying processes are reduced due to reduced solvent use in the wet process.
conclusion
Electrode dry mixing technology is one of the important technologies to achieve high performance battery production. The process ensures a high degree of uniformity and stability of the electrode material by optimizing the various steps, from the dry powder mixing of active substances, conductive agents and binders, to the addition of solvents for wetting, dispersion and final dilution adjustment. With the continuous development of battery industry, dry mixing technology will be paid more and more attention, and will play a greater role in environmental protection and resource conservation. In the future, through the continuous research and optimization of the dry mixing process, we are expected to realize the development of higher performance and more environmentally friendly battery materials, and contribute to the progress of battery technology.
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