Inkjet Printed Graphene Electrodes for High-Performance Supercapacitors

A wide variety of supercapacitors has been developed for many high-power energy storage application. Especially, flexible supercapacitors with thin electrodes are being needed for powering flexible electronics for military applications. In this study, the inkjet-printed graphene electrode is investigated for high-performance thin film supercapacitors. In order to make the ink for printing, graphene flakes ware dispersed in a solvent and then printed onto a metal foil. The electrodes were inkjet-printed with the various graphene flake size and the film thickness. After the printing, the electrodes were dried to remove solvent. These electrodes were sealed together with the electrolyte and separator, and then assembled into a coin cell. The microstructures of the printed graphene electrodes were analyzed by SEM, TEM and XRD. The electrochemical performances were also investigated.