Advanced Se–C nanocomposites: a bifunctional electrode material for both Li–Se and Li-ion batteries

Abstract

A bifunctional nanostructured electrode material of a selenium/micro–mesoporous carbon sphere nanocomposite (Se/MPCS) is reported. With the unusual chain-like Se_n molecules hosted in a MPCS substrate, the Se/MPCS nanocomposite presents impressive electrochemical performances in metallic Li secondary batteries, i.e. Li–Se batteries. Furthermore, a new Li-ion full battery with remarkable properties is constructed by coupling the Se/MPCS anode with the traditional layered cathode. The new design of the as-assembled lithium-ion cell with the Se/MPCS anode promises good security and high capacity as well as a long lifespan.