报告题目：Better battery through better understanding: Battery at CLS
报 告 人： Dr. Jigang Zhou
Canadian Light Source Inc, Canada
报告时间：2016年11月14日（周一）上午10：00
报告地点：材料楼210
个人简介：
Dr. Jigang Zhou received his B.Sc. and M.Sc.in Battery Engineering from Harbin Institute of Technology in China and Ph.D. in Chemistry from Western University, Canada. He has ten years on-field battery R&D experience and almost ten years’ experience on synchrotron. He is currently a staff scientist at Canadian Light Source Inc. His research activities are currently focused on developing synchrotron techniques, especially soft X-ray spectroscopy and spectromicroscopy of on-operando electrochemical cell, combined with various nanomaterials, for their applications in clean energy including fuel cells and Li-ion batteries. Dr. Zhou is an author and co-author of ~ 80 refereed-journals, with H-index of 29.
Abstract
To develop more powerful, safer and low cost battery for electric transportation great, efforts in exploring novel materials and its integration into a battery system are needed. Even though material and battery breakthrough in lab show up almost every day, their large scale commercial application is very rare. The bottleneck is the performance test of a new battery system which is tedious and time consuming. Even with accelerated life test method, the process may still need months to be completed. Understanding of subtle structure difference among candidate materials and their change during operation can speed up the screening process therefore toward a better battery, which asks for advanced material characterization. The BatteryX research team at Canadian Light Source synchrotron offers solutions of applying such characterization tools for better battery. Techniques, such as the element specific probe X-ray absorption near-edge structures (XANES) spectroscopy, will supply detailed information on the local chemistry of the absorbing atom. XANES has been successfully applied to investigate the chemical bonding, electronic structure, and distinguish surface and bulk chemistry difference of novel materials. XANES with nano-focused X-ray beam (STXM) can collect chemical imaging. And synchrotron XPS can specify SEI depth profile non-destructively. In addition, micro-XRD with synchrotron source can map charge/discharge process in a time scale of tens seconds. Even more important, all of those technique can be performed on an operated battery which can catch the minor structure change in very short cycling period. That structure information on charge transfer across electrode/electrolyte interface, phase transition on single particle, reaction distribution in electrode level and electrode topology in cell level will unveil the “black box” process inside battery.
In this talk an overview of synchrotron techniques will be first provided and then case studies of electrode interface by XANES and STXM and electrode inhomogeneity study by XRF micro-probe will be presented.