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Plasma surface processor lithium battery electrode coating pretreatment

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21 Oct,2020

Plasma surface processor lithium battery electrode coating pretreatment:

The production and manufacture of lithium ion battery is a process closely linked by each process step. Generally speaking, the production of lithium battery includes the fabrication process of electrode, fabrication process of cell and assembly process of battery. In the three stages of the process, each process can be divided into several key processes, each step will have a great impact on the final performance of the battery. So the application of plasma surface processor in lithium battery industry arises at the right moment.

Lithium battery Market Analysis:

With the in-depth study of the relationship between electrode material structure and performance, the design of positive and negative electrode materials with a variety of structured structures or doped with a variety of composite structures at the molecular level will strongly promote the research and application of lithium ion batteries. After nickel-Cadmium and nickel-hydrogen batteries, lithium-ion batteries will be a very long time in the future, with good market prospects.

According to the demand trend, electric vehicle market will gradually become a large field of lithium battery application. GGII predicts that the global sales of new energy vehicles in 2022 will reach 6 million units, an increase of 2.7 times compared with 2017, which is affected by the following factors: continuous promotion of policies, technological progress, changes in consumer habits, popularization of supporting facilities, and the demand for lithium batteries for electric vehicles will exceed 325GWh in the same period, an increase of 3.7 times compared with 2017. Meanwhile, competition in the lithium battery industry will mainly focus on the field of new energy vehicles.

Power battery in the future will be the largest in lithium ion batteries growth engine, its development in the direction of high energy density, high security is set, the trend of high-end digital lithium ion battery power battery and lithium ion battery market is the main growth point, lithium electricity under 6 microns copper foil will become key raw materials of lithium ion battery, become the focus of the mainstream enterprise layout.

Selection of coating equipment and coating process:

Coating process includes: uncoiling → splicing → tension control → coating → drying → rectifying → Tension control → rectifying → winding and so on. Coating technology is complex, and factors influencing the coating effect is more, such as: the manufacturing precision of equipment, the stability of the equipment operation, dynamic tension control in the process of coating, drying air flow and temperature control curve, such as size, so choose the appropriate coating process is very important, the plasma surface treatment machine will show the reliability of it.

Common coating methods need to be considered from the following aspects: coating layer number, wet coating thickness, coating liquid rheological property, required coating accuracy, coating support or substrate, coating speed.

Base materials - Copper foil and aluminium foil:

Surface tension: the surface tension of copper and aluminum foil must be greater than the surface tension of the coating solution, otherwise the solution on the substrate tile will be very difficult, resulting in poor coating quality. One rule that must be followed is that the surface tension of the solution to be coated should be 5dynes/cm lower than the substrate, although 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 both surface tensions should also be used as a test item for quality control.

Because the coating process has a high demand on the surface tension of the substrate, so the plasma cleaning can effectively solve this problem.

Before sputtering, painting, bonding, welding, brazing and PVD and CVD coating, the surface of aluminum foil metal often has organic matters and oxidation layers such as grease and grease, which all need cleaning treatment to get a completely clean and non-oxidized surface. However, most of the existing technologies use chemical cleaning methods, which require solvents, are not environmentally friendly, and are prone to "hydrogen embrittle" phenomenon. The deconvolution effect is not ideal, the deconvolution speed is slow, and the mechanical performance index of aluminum foil is easily affected. The use of plasma cleaning surface processor can solve the above problems.

The anode and cathode materials of lithium battery pack are coated with the anode and cathode materials of lithium battery. When the electrode materials are coated with the metal strip, the metal strip needs to be cleaned. The metal strip is generally aluminum or copper thin. Dry cleaning plasma cleaning function can effectively solve the above problems.

Plasma surface processor lithium battery electrode coating pretreatment

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