报告内容摘要

Li-ion batteries are ubiquitous in portable electronics, and are being implemented to power electric vehicles. A Li-ion battery is a system that dynamically couples electrochemistry and mechanics The electrochemical processes of Li insertion and extraction lead to rich phenomena of mechanics, such as large deformation, plasticity, fracture, and fatigue. Likewise, mechanics influences interfacial reactions, ionic transport, stability of chemical reactions, and phase transformations in the electrodes. In this talk, I will highlight the intimate coupling between mechanics and electrochemistry in Li-ion batteries. Theories of diffusion-induced stresses, coupled Li diffusion and large elastic-plastic deformation, concurrent chemical reactions and flow, and fracture of electrodes will be presented. First-principles simulations and in-situ experiments that emphasize the mechanisms of reactions and deformation will also be discussed.

报告人简介:

Dr. Kejie Zhao is an Assistant Professor of Mechanical Engineering at Purdue University.  He received his Ph.D. degree in Engineering Science in 2012 from Harvard University, and obtained his bachelor’s and master’s degrees from Xi’an Jiaotong University in China in 2005 and 2008 respectively. He joined the School of Mechanical Engineering at Purdue in 2014. His research interests include mechanics of energy materials, atomistic modeling of materials science, and in-situ experiments.

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