Title：Electrochemical Energy to Power a Green and Sustainable Future
报告人：Professor Guoxiu Wang, University of Technology Sydney
时间及地点：2020年10月25日8:00-12:00
报告地点：腾讯会议：https://meeting.tencent.com/s/sbJyO6SajZtc会议ID：982 354 011
Abstract: It is universally recognized that a dependence on foreign oil and/or gas creates national vulnerabilities and endangers social stability. Moreover, the gaseous emissions from the burning of fossil fuels and biomass are not only polluting the air of cities but are also creating a global warming with alarming consequences. It is crucial, therefore, to develop new materials or technologies to improve the electrochemical performance of rechargeable batteries with higher energy density.
题目2：高性能锂硫电池正极材料
Title：High-Performance Cathode Host Materials for Lithium-Sulfur Batteries
报告人：Professor Guoxiu Wang, University of Technology Sydney
时间：2020年10月25日13:00-17:00
报告地点：腾讯会议：https://meeting.tencent.com/s/sbJyO6SajZtc会议ID：982 354 011
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[1-5]including 3D hyperbranched hollow carbon nanorod architecture,[1]Poly(3,4-ethylenedioxythiophene) coated multi-chambered micro/mesoporous carbon nanocubes,[2]three-dimensional metal carbide@mesoporous carbon hybrid architecture.[3]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 Wang has been working in the areas of Materials Science and Engineering, Materials Chemistry, Electrochemistry, Energy storage and conversion, Battery technology, and NanoScience and Nanotechnology for 20 years. He has performed extensive research on electromaterials for applications in rechargeable Lithium-ion battery, lithium-air batteries, sodium-ion batteries, lithium–sulfur batteries, supercapacitors and fuel-cells, controllable synthesis of one dimensional semiconductor nanostructures and their applications for chemical and biosensors, and semiconductor quantum dots, quantum wires and quantum tubes for nanoscale electronic and photonic devices. He has won a large number of external research grants. Professor Wang has published over 500 refereed journal papers and delivered 100 keynote/invited talks/seminars worldwide.2018, 2019Highly Cited Researcher. Wang's publications have attracted over 30000 citations with an H-index of95.
