Prof. SuLin Zhang: When Electrochemistry Meets Mechanics: From Chemo-mechanical Degradation of High-Capacity Electrodes to Electrochemically Driven Mechanical Energy Harvesting
报 告 人：Prof. SuLin Zhang
个人简介：Dr. Sulin Zhang received his PhD from the Department of Theoretical and Applied Mechanics in the University of Illinois, Urbana-Champaign in 2002. He then worked as a postdoctoral fellow in Northwestern University. He joined Penn State in 2007, and is currently a Professor in Department of Engineering Science and Mechanics and Department of Biomedical Engineering at Penn State University. Dr. Zhang’s research has been focused on the roles of mechanical forces and stresses in materials, biology, and chemistry. He is the recipient of the Early Career Development Award from National Science Foundation in 2007 and the PSEAS Outstanding Research Award in 2016 from Penn State. Dr. Zhang is severing as an Associated Editor for the journal of Extreme Mechanics Letters, and an editorial board member for Nature Computational Materials.
内容简介：The supply of sustainable energy is arguably the most important scientific and technological challenge in the 21st century. To meet this challenge, enormous efforts have been undertaken to develop new energy storage platforms such as rechargeable batteries that are not only of high-energy and high-power, but also electro-chemo-mechanically durable. While Lithium ion battery (LIB) has remained the best performing electrochemical energy storage technique, high-energy-density LIBs still suffer from rapid, irreversible capacity decay and poor cyclability due to the electro-chemo-mechanically driven degradation and failure. In this talk, I will first present a set of interesting chemo-mechanical degradation phenomena of high-capacity anode materials, enabled by the real-time, atomic resolution imaging via advanced in-situ transmission electron microscopy, corroborated by multiscale, multiphysical modeling. From these phenomena, I will highlight how electrochemistry and mechanics are intimately coupled in defining the degradation. I will then show how nanostructuring, porosity, and surface coating can partially mitigate the degradation. In the end, I will demonstrate how the strong coupling effect can be exploited for electrochemically driven mechanical energy harvesting.