Roll-to-roll electrode coating

Electrode coating in roll-to-roll process
© Fraunhofer IWS Dresden / Jürgen Jeibmann
Electrode coating in roll-to-roll process

A pilot band coating machine is available at the IWS to coat electrode materials. On a small laboratory scale IWS engineers use tabletop squeegees to develop suspensions. The pilot coating machine can be used to apply the suspensions in a continuous process. Solvents are removed in a drying line, which consists of three independent heating zones. The wet film deposition is performed via a roll at a speed of up to 6 m/min. Foils can be coated up to a width of 30 cm. Flammable solvents such as NMP can be used as well. After the deposition coatings are compacted and smoothened using a 250 kN calendar.

The machine is used for several projects to develop process and fabricate electrodes for applications in double layer capacitors (supercaps) and lithium ion batteries.