Graphene and Graphene Composites in Electrochemical Capacitors and Li-Ion Batteries

Abstract

Graphene and derived materials have recently emerged as a new promising class of materials featuring unique electrical, mechanical, magnetic and thermal properties. Electrochemical energy conversion and storage devices, in particular supercapacitors and Li-ion batteries, are widely regarded as one of main areas where graphene related materials may find application. The present work describes synthesis and structural properties of reduced graphene oxide (rGO) and rGO/Fe3O4. These materials are subsequently tested in symmetrical capacitors and hybrid capacitors with alkaline electrolyte as well as in a conventional Li-ion cell setup. It is demonstrated that certain electrochemical devices can clearly benefit form graphene materials in terms of power capability. On the other hand, particle agglomeration and increased reactivity hinders making full usage of the graphene capability.