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    Truth Forum of Materials Science: Dr.Yimei Zhu from Brookhaven National Laboratory

    Editor:yaoxx Date:2016-12-19 Hits:3932

     

    Tracking Ionic Transport and Electrochemical Reactions in Individual Nanoparticles

    for Energy Storage

     

    Speaker:  Dr.Yimei Zhu

    Affliation:  Institute for Advanced Electron Microscopy, Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory

    Time: 10:00am, Dec.27, 2016

    Location: RM324, Chao Kuang Piu Hall of Science and Technology, Yuquan Campus, Zhejiang University

    Host: Prof. Gaorong Han

     

     

    Abstract

    Lithium-ion batteries are one of the most popular rechargeable energy storage devices for portable electronics and electrical vehicles. To design safe, high-energy electrodes with long-cycle life, we need a better understanding of how electrode materials function in real-time at nanoscale. In this presentation, I will show a method we developed for performing in-situ electron microscopy to track lithium transport and electrochemical reactions. Two examples will be given. One is on lithium conversion reaction in individual FeF2 particles. The other is on lithium diffusion in Ag or K doped MnO16 hollandite nanorods which exhibit intriguing 1D tunnel structure that can be manipulated for charge transfer. The microscopy investigations were integrated with bulk x-ray and electrochemical measurements as well as theoretical calculations at atomic scale based on DFT and meso scale based on phase-field theory. The role of the defects in the lithiation process will be discussed. The bandgap and vibration mode measurement using monochromated VEELS (valence and vibrational electron energy-loss spectroscopy) and IR spectroscopy to understand the conductivity of the individual nanorods and energetics of the dopants and ions in the tunnels will be presented. 

    The author would like to thank F. Wang, L. Wu, F. Xu, Q. Meng, M. Hybertsen, AC Marschilok and ES Takeuchi for their collaborations. The work was supported by the U.S. DOE/BES under contract DE-SC0012704.
     

    Bio-Sketch
     
    Yimei Zhu received his BS from Shanghai Jiaotong University, China in 1982, MS and PhD from Nagoya University, Japan in 1987. He joined Brookhaven National Lab as Assistant Scientist in 1988,  rising through the rank to become Tenured Senior Physicist in 2002. He is the director of Institute of Advanced Electron Microscopy, and cofounders and Facility Leader of the Center for Functional Nanomaterials at BNL. Zhu is also an adjunct professor at Dept. of Applied Physics and Mathematics, Columbia University, and Dept. of Physics and Astronomy and Dept. of Materials Science at Stony Brook University. His research interests include understanding structure-property relationship of strongly correlated electron systems, multiferroics and energy materials as well as advanced electron microscopy. During his career, he has served on various academic committees, and received many honors & awards. He is an Inaugural Fellow of Microscopy Society of America, elected Fellow of American Association for the Advancement of Science, and Fellow of American Physical Society. Zhu has published more than 450 peer-reviewed journal articles and delivered more than 250 invited talks at international conferences and workshops. Zhu can be reached at zhu@bnl.gov.
     

     

    Dr.Yimei Zhu