Graphene for Energy Storage Applications

B.Z. Jang
Angstron Materials, Inc, US

Keywords: graphene, energy storage, supercapacitors, lithium-ion batteries, composites

Summary:

Graphene is an emerging class of nano materials that are of great scientific and commercial significance. A single-layer graphene is composed of carbon atoms forming a 2-D hexagonal lattice through strong in-plane covalent bonds. In a multi-layer graphene, several graphene planes are weakly bonded together through van der Waals forces in the thickness-direction. Single-layer and multiple-layer graphene are herein collectively referred to as nano graphene platelets (NGPs). NGP’s may be oxidized to various extents during their preparation, resulting in the formation of graphene oxide (GO). NGPs are predicted to have a range of unusual physical, chemical, mechanical and electrochemical properties. Many unique properties have been observed, but many more remain to be discovered. This presentation will begin with a brief review of our earlier work in graphene preparation (2002), graphene for composite applications (2002-2004), and graphene for energy applications (2004-2006). This will be followed by a review on our more resent work (2007-2012) on graphene for supercapacitors, lithium-ion batteries, and lithium metal batteries. This presentation will conclude with a discussion on the new surface mediated cell (SMC), which exhibits the highest power density among all energy storage devices.