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纳米化学成像技术在电池界面研究中的应用
发布时间:2017-11-29   浏览次数:

报告名称:In-depth Understanding of Battery Interfaces by Nanoscale Chemical Imaging (纳米化学成像技术在电池界面研究中的应用)

间:1212上午1000

报告地点:材料学院210会议室

主讲人:Jigang Zhou 教授 Canadian Light Source

讲座内容:

Deeper understanding of the interface (chemical and electronic structure) between components within hybrid active electrode materials and the interface between active electrode materials and the electrolyte is crucial for developing better performance batteries. Element specific X-ray absorption near-edge structures (XANES) spectroscopy, explores detailed information on the local chemistry and electronic states of the absorbing atom which makes it an excellent tool for battery interface investigation to understand chemical bonding, electronic structure, and surface and bulk chemistry difference. XANES with nano-focused X-ray beam (STXM) and surface sensitive field-imaging X-PEEM can collect chemical imaging of high chemical sensitivity and spatial resolution. In this talk I will show nanoscale chemical imaging studies of battery materials by STXM and X-PEEM at CLS SM beamline. The emphasize is novel STXM with yield signal detection (XRF and TEY) and exploratory X-PEEM for surface imaging. Correlative chemical imaging of interface in a commercial like electrode without sample preparation was obtained by X-PEEM. This approach maintains the nature of the interface which is an interplay of local environment, morphology and facet orientation of electrode active materials. That information will lead new insights on battery material surface engineering in and/or out of battery cell toward a battery with high performance and long serve life.