1.2 Coating

In the coating step, the slurry is applied to a current collector foil (typically copper or aluminium) using tools such as a slot die, doctor blade, or anilox roller. Coating can be performed in a continuous or intermittent manner and may be applied to one or both sides of the foil—either sequentially or in a tandem coating setup. 

This roll-to-roll process typically handles web widths up to 1200 mm. After coating, the foil passes through a drying channel where controlled heat evaporates the solvent. The coated web is then transported via rollers or non-contact levitation systems, and rewound onto an inner core for transfer to the next process step. Environmental controls are critical to prevent dust, moisture, or thermal instability from affecting coating quality.