Physico-Chemical Analysis of GO-S and rGO-S Composites as Electrodes for Flexible Li-S Battery

Abstract

Lithium-sulphur batteries are one of the very appealing power sources with high energy density. In addition, sulfur (S) is also inexpensive, abundant, and nontoxic. Therefore, sulfur is a promising cathode material for high specific energy Li–S batteries. In this work, we used a low-cost and environmentally benign chemical reaction deposition strategy to immobilize sulfur on quasi two dimensional graphene oxides (GO) to prepare graphene oxide-sulfur (GO–S) and reduced-graphene oxide-sulfur (rGO–S) nanocomposite cathodes for Li–S batteries. The characterization of these composites have been performed by using X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM), Transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR) analysis. The XRD results reveals the orthorhombic crystalline structure of GO–S and rGO–S composites confirmed by diffraction peaks at 2θ = 22.90(222),25.90(026) and 28.00 (040). FT-IR spectra confirms bonding structure of composites. SEM and TEM images confirm interconnected network of GO–S and rGO–S composites having uniform surface morphology with particle size distribution 32–36 nm respectively.