What are the key issues for the pole piece rolling of lithium batteries?

The compaction density of the surface coating material has a very important relationship with the electrochemical performance of the battery. Reasonable compaction density can effectively increase the electrochemical performance of the battery, reduce the contact resistance and AC impedance of the electrode, and increase the participation in the electrochemical reaction. The active material area, thereby significantly improving the electrochemical performance of the pole piece coating material.

The pole piece manufacturing process is mainly a coating and rolling process, wherein the rolling process is critical. The pole piece rolling process mainly solves the following key problems:

(1) reducing the elongation and the broadness of the pole piece during the rolling process, and reducing the failure rate of the pore structure of the pole piece coating material;

(2) Improve the thickness uniformity of the pole piece coating to improve the cross-sectional shape of the pole piece.

(3) improving the compaction density consistency of the electrode material after the pole piece rolling;

(4) Reducing the rebound of the surface electrode material after the pole piece rolling.

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