In many of the processes used for coating in lithium battery industry, these processes rely on a series of rollers to guide and transport the substrate through the machines and control its tension as well as transfer coatings onto the moving web. Traditionally these rollers were made of steel or aluminum. However, lighter weight composite materials such as carbon fiber are now being used to replace some of these rollers.https://www.coreco-group.com/Lithium-battery.html