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The compaction density of electrode surface coating materials is closely related to the electrochemical performance of batteries. A reasonable compaction density can effectively increase the electrochemical performance of batteries, reduce the contact resistance and AC impedance of electrodes, increase the area of active materials participating in electrochemical reactions, and significantly improve the electrochemical performance of electrode coating materials.

The manufacturing of lithium-ion battery poles belongs to the category of high-precision manufacturing. Pole rolling is different from plate and strip rolling. Plate and strip rolling is a process in which metal materials undergo longitudinal extension and transverse broadening, and the material density does not change during the rolling process. The electrode material on the surface of the battery electrode is a porous structure. During the rolling process, the electrode material on the positive and negative electrode plates is compacted, and the density changes. Pole rolling is a process where the pore structure is filled and the coating particles gradually become dense.

The purpose of polar roller pressing is as follows:

1) Ensure that the surface of the electrode is smooth and flat, and prevent burrs on the coating surface from piercing the diaphragm and causing short circuits;

2) Compact the electrode coating material to reduce the volume of the electrode and increase the energy density of the battery;

3) Make the contact between active substances and conductive agent particles closer, and improve the electronic conductivity;

4) Enhance the bonding strength between coating materials and current collectors, reduce the occurrence of powder shedding during the cycling process of battery electrodes, and improve the cycling life and safety performance of batteries.

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