Date: Thursday, Oct 29th
Presenter: Dr. Chong-Min Wang, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory
In-situ diagnosis appears to be one of the essential methods for gaining insights as how an electrode material failure, therefore feeding back for designing and creating new materials with enhanced battery performances. In this presentation, I will highlight recent progress on ex-situ, in-situ and operando S/TEM and in-situ liquid SIMS for probing into the structural and chemical evolution of energy storage materials. Both ex-situ and In-situ high resolution imaging enables direct observation of structural evolution, phase transformation and their correlation with mass, charge and electron transport, providing insights as how active materials failure during the cyclic charging and discharging of a battery. In perspective, challenges and possible direction for further development of the in-situ S/TEM imaging and spectroscopic methods for energy storage materials and other field will also be discussed. Most importantly, integration of different analytical tools appear to be the key for capturing complementary information.
Chongmin Wang currently is a staff scientist at Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory. His current research is focused using scanning/transmission electron microscopy (S/TEM) to probe materials for energy storage and conversion, especially in-situ and operando S/TEM probing of energy materials. Before joining PNNL in 2001, he worked at Max-Planck Institute for Metal Research in Stuttgart in Germany, National Institute for Materials Science in Japan, and Lehigh University in USA. He received his B. Sc. and M. Sc. in physics from Lanzhou University in China and his Ph.D. in Materials Science and Engineering from Leeds University in United Kingdom. He was the recipient of Microscopy Today Innovation Award, R and D 100 award, Rowland Snow Award from the American Ceramic Society, and Outstanding Invention Award from Japanese Science and Education Committee. He has published 280 journal articles and has given over 35 invited and planetary conference talks.