On December 26, 2025, technical research in the lithium battery industry shows that the drying of coated electrodes, as a core link in lithium battery production, is crucial for the performance and quality of batteries. Currently, the mainstream drying methods are mainly divided into three categories, each with distinct technical characteristics and applicable scenarios.
    Far-infrared radiation drying transfers thermal energy to the electrode surface through far-infrared emitting elements to achieve liquid vaporization. It has a simple equipment structure and is widely used in low-grade coating machines, but it has problems such as low drying efficiency and easy uneven drying. Double-sided air supply floating drying relies on a special air nozzle design, using the Coanda effect of air flow to make the electrode in a floating state, enabling simultaneous double-sided drying with significantly improved efficiency. However, the equipment has a complex structure and high power consumption. Circulating hot air impingement drying destroys the static air layer on the electrode surface with high-speed jet airflow, featuring high drying efficiency. It can also avoid electrode cracking caused by high temperature by adjusting air volume, but it has strict requirements for air duct layout and air nozzle design.
    In terms of drying principle, it is necessary to heat to vaporize and discharge moisture or solvents in the electrode. The process must meet the dynamic condition that the vapor pressure of moisture is higher than that of hot air, and is divided into three key stages: preheating, constant-rate drying, and falling-rate drying. Improper stress control in the constant-rate drying stage can easily cause electrode cracking; in the falling-rate stage, attention must be paid to the moisture diffusion efficiency to ensure the final formation of a uniform porous dry electrode coating.
    At present, the industry also faces common drying defects such as bubbles, edge bulging, and craters. These need to be addressed through measures such as defoaming treatment of the slurry, optimizing the oven temperature and air speed, and strengthening environmental dust control. With the increasing requirements for energy density and safety of lithium batteries, the electrode drying technology is continuously upgrading towards high efficiency, energy saving, precise temperature control, and automated quality monitoring, providing key support for the high-quality development of the lithium battery industry.

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