Method and device for manufacturing surface microstructure of high-rate battery pole piece

Abstract

The invention discloses a method and device for manufacturing a surface microstructure of a high-rate battery pole piece, and the method comprises the following working steps: 1, coating a metal foil with battery slurry, and drying and rolling to obtain the battery pole piece; 2, laser processing is conducted on the battery pole piece through a laser device, rapid scanning is conducted on the surface of a coating, a surface adhesive film is vaporized through laser, a large number of micro-micron structures are generated, electrolyte can rapidly permeate into a coating lining, and the permeation number rate and the permeation contact surface area can be greatly increased; the invention has the beneficial effects that a plurality of micro-micron structures are formed on the coating adhesive film on the surface of the pole piece, and electrolyte can permeate into deeper places along the channels and can quickly permeate into the coating lining material, so that the permeation number rate and the permeation contact surface area are greatly increased; the function of the active substance can be better played in the charging and discharging process; and due to the existence of the micro-micron structure, the dynamic obstruction of lithium ions in the charging and discharging process is reduced, and the motion path is better.

Description

technical field [0001] The invention relates to the technical field of surface processing of battery pole pieces, in particular to a method and a device for fabricating microstructures on the surface of a high-rate battery pole piece. Background technique [0002] In lithium-ion batteries, improving energy density has become an important direction for the development of lithium ions. In terms of electrode engineering, the preparation of ultra-thick pole pieces with high coating amount is the most direct way to improve the specific energy of the battery. The increase in the migration resistance in the electrolyte is the main reason that affects the rate characteristics, especially when the depth that the electrolyte can infiltrate is less than the thickness of the pole piece or is not much different from the thickness of the pole piece, the diffusion process of lithium ions in the pole piece is limited. , the electrolyte channel becomes the main factor affecting the electroch...

AI Technical Summary

Problems solved by technology

[0003] CN113224260A discloses a high-rate lithium battery structure and its implementation method. The technical solution is to coat the active material coating on the surface of the current collector and form microchannels on the surface of the layer to increase the contact between the electrolyte and the active material coating. Contact area and contact efficiency; but this solution needs to first coat a layer of active material on the current collector, which increases the cost and efficiency; and after coating the active material layer, the thickness will increase, reducing the volume of the lithium battery Capacity; if the adhesion of the active material layer is not high, there is a risk of falling off

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