Friday, May 5th, 2017
3:00PM – 4:15PM
Advanced Materials Design, Diagnosis and Operando Characterization for Enabling High Energy Long Life Rechargeable Batteries
Y. Shirley Meng, Ph.D.
Sustainable Power and Energy Center, Laboratory for Energy Storage & Conversion, University of California San Diego, USA
Bio: r. Y. Shirley Meng received her Ph.D. in Advance Materials for Micro & Nano Systems from the Singapore-MIT Alliance in 2005, after which she worked as a postdoc research fellow and became a research scientist at MIT. Shirley is currently the Professor of NanoEngineering, University of California San Diego (UCSD). Dr. Meng’s research focuses on the direct integration of experimental techniques with first principles computation modeling for developing new intercalation compounds for electrochemical energy storage. She is the founding Director of Sustainable Power and Energy Center (SPEC), consisting faculty members from interdisciplinary fields, who all focus on making breakthroughs in distributed energy generation, storage and the accompanying integration-management systems. She is the principle investigator of the research group - Laboratory for Energy Storage and Conversion (LESC). Dr. Meng received several prestigious awards, including C.W. Tobias Young Investigator Award of the Electrochemical Society, BASF Volkswagen Electrochemistry Science Award, Frontier of Innovation Award and NSF CAREER Award. Dr. Meng is the author and co-author of more than 120 peer-reviewed journal articles, 1 book chapter and two patents.
Abstract: High energy long life rechargeable batteries is considered as key enabling technology for deep decarbonization. Advanced materials characterization tools are essential for scientists and engineers to understand operation and degradation mechanisms in materials for energy storage, in order to propose solutions and strategies for improvement. Scanning electron microscopy and electron energy loss spectroscopy (STEM/EELS) offers unprecedented spatial resolution, which has enabled nanoscale imaging and chemical analysis of battery materials - their surfaces, grain boundaries and phase boundaries. Combining the state-of-the-art in situ operando analytical electron microscopy with first principles (FP) computational data analysis, we reveal some insights that could not be possible to see in the past. On the other hand coherent x-ray diffraction imaging (CXDI), a lensless form of microscopy capable of discerning electron density and strain with 10 nm resolution, can be used to map the strain evolution of a single cathode particle in a functional battery as it is cycled in-situ. The evolution of compressive/tensile strain reveals a number of interesting phenomena, related closely to the electrochemical performance of the materials. By combining electron based and X-ray based novel imaging techniques, I hope to showcase the state-of-the-art diagnostic tools developed for probing and understanding functional materials in operando.