报告题目：Defect-driven Nanostructured Electrode Materials for Energy Storage Systems
报告人：Prof Hui (Claire) Xiong，Micron School of Materials Science and Engineering Boise State University, Boise, Idaho, USA
Dr. Hui (Claire) Xiong is an Assistant Professor in the Micron School of Materials Science and Engineering at Boise State University, USA. Dr. Xiong received a BS in Applied Chemistry, MS in Inorganic Chemistry from East China University of Science and Technology, and a PhD in Analytical Chemistry from the University of Pittsburgh. Between 2008 - 2012, she conducted postdoc work at Harvard University and Argonne National Laboratory where her research involved electrochemical characterization of micro-fabricated cathode materials for micro-solid oxide fuel cells and the development of novel nanostructured electrode materials for rechargeable batteries. Xiong received the NSF CAREER Award in 2015. Her current research is focused on design and development of nanoarchitectured and defect-driven electrode materials, electrolyte stability, and ion-irradiated electrode materials for rechargeable batteries including Li-ion and Na-ion batteries.
Rechargeable batteries such as lithium-ion batteries and sodium-ion batteries are promising energy storage technologies to provide high energy and high power for applications such as electric vehicles or electrical grids. Recent studies have observed that electrode materials (e.g. TiO2) containing intentional structural defects exhibit enhanced electrochemical charge storage capacity. In the first part of this talk I will introduce our work on the irradiation effect on structure and electrochemical response of TiO2 nanostructured electrodes through room-temperature and 250 ?C proton irradiations as irradiation is known to produce an excess of defects in a material. The defect generation upon irradiation and changes in electrochemical response in nanostructured TiO2 samples in lithium-ion batteries will be discussed. In the second half of this talk I discuss our work on disordered 3D multi-layer graphene material as an anode for sodium-ion battery. Furthermore, the intercalation of sodium into the defective graphene structure is discussed through electrochemical characterization, Raman spectroscopy, and small-angle X-ray scattering experiments.