Facile hydrothermal synthesis of graphene aerogel/cobalt oxides nanocomposites with exceptional lithium storage properties

摘要

Cobalt oxides have attracted extensive attention because of their exceptional physical and electrochemical properties that can meet the demanding requirements of high performance lithium-ion batteries (LIBs).However, the large volume changes and severe particle aggregation taking place in metal compounds during Li ioninsertion/extraction, often lead to electrode pulverization and loss of inter-particle contacts, consequently resulting in large irreversible capacities and poor cyclic stability. An attractive solution to these challenges is to develop highly flexible electrodes containing graphene or graphene oxide (GO) as the essential component/However, graphene or GO sheets tend to re-stack together due to van der Waals forces and hydrogen bonds between them when they are assembled using solution casting or vacuum filtration.Preparing 3D graphene structures, such as graphene aerogel (GA), can avoid the above re-stacking issues as an alternative solution for energy storage devices.