Three-Dimensional S/CeO₂/RGO Composites as Cathode Materials for Lithium⁻Sulfur Batteries

Materials
Qiuyan HaoYongguang Zhang

Abstract

In this paper, the synthesis of the three-dimensional (3D) composite of spherical reduced graphene oxide (RGO) with uniformly distributed CeO₂ particles is reported. This synthesis is done via a facile and large-scalable spray-drying process, and the CeO₂/RGO materials are hydrothermally compounded with sulfur. The morphology, composition, structure, and electrochemical properties of the 3D S/CeO₂/RGO composite are studied using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), Raman spectra and X-ray photoelectron spectroscopy (XPS), etc. The electrochemical performance of the composites as electrodes for lithium⁻sulfur batteries is evaluated. The S/CeO₂/RGO composites deliver a high initial capacity of 1054 mAh g-1, and retain a reversible capacity of 792 mAh g-1 after 200 cycles at 0.1 C. Profiting from the combined effect of CeO₂ and RGO, the CeO₂/RGO materials effectively inhibit the dissolution of polysulfides, and the coating of spherical RGO improves the structural stability as well as conductivity.

References

Oct 12, 2012·Accounts of Chemical Research·Scott Evers, Linda F Nazar
Nov 19, 2013·Angewandte Chemie·Ya-Xia YinLi-Jun Wan

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Methods Mentioned

BETA
scanning
transmission
X-ray
electron diffraction

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