Chemomechanics of electrodes in Li-ion batteries
讲座名称：
Chemomechanics of electrodes in Li-ion batteries
讲座时间：
2014-07-14
讲座人：
赵克杰
形式：
校区：
兴庆校区
实践学分：
讲座内容：
报告人：赵克杰
报告题目：Chemomechanics of electrodes in Li-ion batteries
时间：2014年7月14日（星期一）下午4点-5点
地点：教一楼南二层第二会议室
报告主持：刘子顺教授
讲座简介：
High-energy density 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. During charge and discharge of a Li-ion battery, the amount of Li in the electrodes varies substantially, causing the host electrodes to deform. The deformation induces a field of stress, which may lead to fracture or morphological change. Lithiation reactions in batteries lead to rich phenomena of mechanics in the electrodes, such as large deformation, plasticity, fracture, and fatigue. Likewise, mechanics influences the chemistry of lithiation in a significant manner. Stress affects reactions at the interface between the electrode and electrolyte, diffusion of Li in the electrode particles, and phase transformations of the electrode materials. In this talk, I will highlight the intimate relation 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 illustrated. First-principles simulations and experimental measurements that emphasize the mechanisms of reactions and deformation will also be discussed.
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