报告人：WANG Donghai, Pennsylvania State University, USA
Dr. WANG Donghai is currently Associate Professor at Department of Mechanical Engineering and Department of Chemical Engineering at The Pennsylvania State University. Before joining Penn State in 2009, he was a postdoc and subsequently became a staff scientist at Pacific Northwest National Laboratories where he developed functional materials for catalysis and energy storage techniques. He received a B.S. and Ph.D. degree in Chemical Engineering from Tsinghua University and Tulane University in 1997 and 2006, respectively. Dr. WANG Donghai’s research interests have been related to design and synthesis of materials for a variety of applications. His recent research is focused on material development for energy conversion and storage technologies such as batteries, supercapacitors, fuel cells and solar fuels. Professor WANG has authored and co-authored over 90 peer reviewed publications, more than 15 patents and patent applications, and 4 book chapters.
In this talk, he will present strategies to reinforce the solid-electrolyte interphase (SEI) with desired properties including good tolerance to the Li interface change and efficient surface passivation against electrolyte penetration. The approach works via either introducing multiple functional components bonded to the Li surface into the SEI or depositing flexible organic/inorganic hybrid coating layer. This self-forming of the reinforced SEI can be triggered once fresh Li is deposited at the interface, thus realizing a lasting formation of the stable SEI. The as-formed durable SEI layer can suppress dendritic Li growth, enhance Li plating/stripping CE, and in turn, enable Li-S batteries with long cycling life and good capacity retention. He will also demonstrate the reinforced SEI can improve Li metal efficiency in a carbonate-based electrolyte for Li-metal oxide batteries. This study provides a promising route to address the issues associated with Li metal anodes and promote the development of high-energy rechargeable Li metal batteries.