Graphene Supported Silicon Nanocomposites As Anode for Lithium-Ion Batteries

Abstract

This work indicates Silicon/Grphene (Si/G) nanocomposites anode on the performance in lithium-ion batteries (LIBs). The self-assembled graphene aerogel and silicon (Si/G) anode materials with some surface defects have been successfully prpared by hydrothermal synthesis using chemically modified graphene oxide and commercial Si nanopowder (about 50 nm) as precursor. The morphologies and textural properties of as-obtained Si/G were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, and other sturucture techniques. The surface defects and electrical conductivities of Si/G can be controlled by adjusting the amount of Si nanopowder. The results indicate that Si/G with Si amount of half exhibits excellent stability and reversible capacity and superior rate capability with excellent cycling stability. It is demonstrated that the 3D porous network with increased defect density, as well as the considerable electrical conductivity, results in the excellent electrochemical performance of the as-made Si/G anodes in LIBs.