ABSTRACT
This chapter summarizes the progress in graphene-based composite materials for electrochemical energy storage devices, including lithium/sodium-ion batteries, lithium-sulfur batteries, lithium-air batteries and supercapacitors. Graphene and graphene-based materials have attracted great attention owing to their unique properties of high mechanical flexibility, large surface area, and chemical stability, superior electronic and thermal conductivities that render them great choices as alternative electrode materials for electrochemical energy storage systems. Graphene is preferably used for the encapsulation of electrochemically active materials for energy storage and conversion owning to its extraordinary conductivity, large surface area, excellent flexibility and high chemical stability. Electrochemical capacitors, also known as supercapacitors, have attracted much attention due to superior power density, fast charge/discharge rates and long cycle lifetime compared to other chemical energy storage devices. Graphene and graphene-based nanocomposites have been proposed as attractive and alternative nanostructured electrode materials for supercapacitors due to their excellent chemical stability, and superior electrical and thermal conductivities.
