Graphene composite as electrodes for super capacitors

Purpose and goal

The aim of the project was to explore the performance and properties of a new graphene composite as a supercapacitor electrode, and to conduct electrical evaluations and printing tests. The production process has been streamlined and by that the production volume has been increased. The properties of the material have been measured and tested, both in a simple three-way electrode and as a printed electrode. At this point, supercapacitor measurements have been an excellent way to get feedback on the properties of the material, with only small amounts of material available.

Expected results and effects

The production rate was increased by a factor of 8, with maintained quality. However, the target was to increase it even more and to reach that the process must be continuous. The next step is to test that process in lab. The preformed tests indicate that the capacity of the material is lower than expected and the surface is not as porous as we were aiming for. This means that we must add a step to the process to reach our desired properties. The electrode printing test shows positive results. The porosity of the printed electrode allowed the measured specific capacity of the material to be doubled.

Planned approach and implementation

The material was produced at KTH´s Electrum lab in Kista by Bright Day. The production volume was maximized while maintaining quality. The optimal procedure was then repeated to produce material for material tests and electrode printing test. These tests were performed at RISE Acreo in Norrköping. It was tested whether a layer of the material on copper served as a conductor. Then tests were done in a three-way electrode with different electrolytes and adhesives. In the electrode printing test, a slurry containing the material was used and then printed on aluminium and carbon conductors.