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Pretreatment of lithium battery electrode coating using plasma surface treatment machine

Date:2021-05-19 Views:1663

The production and manufacture of lithium-ion batteries is a process closely linked by many steps. Overall, the production of lithium battery includes electrode manufacturing, cell fabrication and battery assembly process. In these three stages, each process can be divided into several key steps, and each step will have a great impact on the performance of the battery. Therefore, the application of plasma surface processor in lithium battery industry came into being.

Lithium battery market analysis: with the in-depth study of the relationship between the structure and performance of electrode materials, the design of positive and negative materials with a variety of regular structures or doped with a variety of composite structures at the molecular level will effectively promote the research and application of lithium ion batteries. After nickel cadmium and nickel hydrogen batteries, lithium ion batteries will promising candidate for quite a long time in the future. According to the market demands, the electric vehicle market will gradually become a large field of lithium battery application. GGII predicts that the global sales of new energy vehicles will reach 6 million in 2022, an increase of 2.7 times over 2017, which is affected by the following factors: the continuous promotion of policies, technological progress, the change of consumer habits, the popularization of supporting facilities, and the demand for lithium batteries of electric vehicles will exceed 325gwh in the same period, an increase of 3.7 times over 2017. At the same time, the competition in the lithium battery industry will mainly focus on the field of new energy power vehicles. In the future, power battery will be the growth engine in the field of lithium-ion battery, and its development trend towards high energy density and high safety has been determined. Power battery and high-end digital lithium-ion battery will become the main growth point of lithium-ion battery market, 6 μ Lithium copper foil below m will become the key raw materials of lithium-ion battery and the focus of the layout of mainstream enterprises. Selection of coating equipment and coating process: the coating process includes: uncoiling → splicing → pulling → tension control → coating → drying → deviation correction → tension control → deviation correction → winding, etc. The coating process is complex, and there are many factors affecting the coating effect, such as the manufacturing accuracy of the equipment, the stability of equipment operation, the control of dynamic tension in the coating process, the size of drying air flow and temperature control curve. Therefore, it is very important to select an appropriate coating process. At this time, the plasma surface processor shows its reliability. Common coating methods need to be considered from the following aspects: number of coating layers, wet coating thickness, rheology of coating solution, required coating accuracy, coating support or substrate, coating speed, etc. Substrate - copper foil and aluminum foil: surface tension: the surface tension of copper aluminum foil must be greater than that of the coating solution, otherwise it will be difficult for the solution to be tiled on the substrate, resulting in poor coating quality. A principle that must be followed is that the surface tension of the solution to be coated should be 5 dynes / cm lower than that of the substrate. Of course, this is only a rough calculation. The surface tension of solution and substrate can be adjusted by adjusting the formula or substrate surface treatment. The measurement of two kinds of surface tension shall also be regarded as a test item of quality control. Because the coating process has high requirements for the surface tension of the substrate, plasma cleaning can effectively solve this problem. Before sputtering, painting, bonding, welding, brazing, PVD and CVD coating, the metal surface of aluminum foil often has organic substances such as grease and oil stain and oxide layer, which need cleaning treatment to obtain a completely clean and oxidation-free surface. However, most of the existing technologies adopt chemical cleaning methods, which require solvents, are not environmental friendly, are easy to produce "hydrogen embrittlement", the decontamination effect is not ideal, the decontamination speed is slow, and it is easy to affect the mechanical performance index of aluminum foil. The above problems can be solved by using plasma cleaning surface processor. The positive and negative electrode materials of lithium battery pack are coated on the metal strip. When the metal strip is coated with electrode materials, the metal strip needs to be cleaned. The metal strip is generally aluminum thin or copper thin. The original wet ethanol cleaning is easy to damage other parts of lithium battery. Dry cleaning plasma cleaning function can effectively solve the above problems.


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