Cathode Host Materials for High-Performance Lithium-Sulfur Batteries 

Guoxiu Wang

Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney

Abstract: Lithium-sulfur batteries have been plagued for a long time due to low Coulombic efficiency, fast capacity loss, and poor high rate performance. Our focus is on the design and synthesis of various of innovative cathode host materials for lithium-sulfur batteries including 3D hyperbranched hollow carbon nanorod architecture, Poly(3,4-ethylenedioxythiophene) coated multi-chambered micro/mesoporous carbon nanocubes, three-dimensional metal carbide@mesoporous carbon hybrid architecture. These sulfur nanocomposite cathodes deliver a high specific capacity and exhibit stable cycling performance. Particularly, poly(3,4-ethylenedioxythiophene) coated multi-chambered micro/mesoporous carbon nanocubes-sulfur cathodes delivered a high initial capacity of 1086 mAh/g at 1C rate and long cycling life up to 1000 cycles, and the electrodes also exhibited high rate capabilities of 842 mA h/g and 530 mA h/g after 1000 cycles at 5C and 10C, respectively. The superior electrochemical performances should be ascribed to the unique nano-architectures, which can effectively prevent the dissolution of polysulfides, decrease self-discharge, and confine the volume expansion during cycling. High capacity, excellent high-rate performance, and long cycle life endow the as-developed sulfur/carbon nanocomposites promising cathode materials for lithium-sulfur batteries.

Biography: Professor Guoxiu Wang is the Director of the Centre for Clean Energy Technology and a Distinguished Professor at University of Technology Sydney (UTS), Australia. Professor Wang is an expert in materials chemistry, electrochemistry, energy storage and conversion, and battery technologies. He graduated with PhD degree from University of Wollongong in 2001. He was awarded ARC Queen Elizabeth II fellowship in 2007 and ARC Professorial Future Fellowship in 2011 by the Australian Research Council. He received the New South Wales state government’s Science and Engineering Award in 2012 and University of Technology Sydney Vice-Chancellor's Award for Research Excellence: Chancellor’s Medal for Exceptional Research in 2014. Currently, he serves as an Associate Editor for Frontiers in Energy Research, and an editorial board member for Scientific Reports (Nature Publishing Group) and Energy Storage Materials (Elsevier). Professor Wang is a member of the ARC College of Experts. His research interests include lithium-ion batteries, lithium-air batteries, sodium-ion batteries, lithium-sulfur batteries, supercapacitors, hydrogen storage materials, fuel-cells, graphene, and chemical functionalisation of graphene. Professor Wang has published more than 400 refereed journal papers with an h-index of 67 (Web of Science). His publications have attracted over 17,000 citations (Web of Science).