Bubble defects generated during the coating process of lithium battery electrodes have long affected key indicators such as battery uniformity, capacity, and cycle life. Industry research shows that bubbles mainly come from entrained gas or reaction-generated gas in the slurry preparation, coating, and drying stages, as well as electrochemical side reactions. They may lead to uneven coating, abnormal pore structure, poor interface contact, and even short-circuit risks.
    To address this challenge, the industry has sought breakthroughs through multi-dimensional technical upgrades. In the slurry preparation stage, methods such as vacuum defoaming, addition of suitable defoamers, and optimization of solid content and solvent selection are adopted to reduce bubble formation. In the coating process, substrate pretreatment improves wettability, coating parameters are optimized with a gradient drying curve, and a CCD vision system is used for online monitoring. In terms of equipment and environment, the design of the die flow channel is improved, a vacuum suction device is added, and the temperature and humidity of the clean room are strictly controlled. These measures have effectively improved the bubble problem and laid a solid foundation for the quality improvement of lithium batteries.

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