Structure and Electronic Structure of Battery Materials at Atomic Scale

Lin Gu

Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed, Matter Physics 

Abstract: Performance optimization of lithium-ion batteries necessitates information about structural evolution of electrode materials at an atomic scale. The annular-bright-field (ABF) imaging in aberration-corrected scanning transmission electron microscopy (STEM) allows simultaneous imaging of light and heavy elements, providing an unprecedented opportunity to probe the nearly equilibrated local structure of electrode materials after electrochemical cycling at atomic resolution. In this report, we will present our recent efforts on revealing the atomic-scale structure of selected electrode materials with different charge and/or discharge state, e.g., the lattice distortion, phase interface structure, transition metal migration, surface reconstruction with (partial) intercalation and de-intercalation, to extend the current understanding of electrochemical reaction mechanism with the ABF and high-angle annular dark-field (HAADF) STEM imaging[1-5]. Future prospect on the relationship between atomic-level structure evolution and microscopic reaction mechanisms of electrode materials for rechargeable batteries is envisaged.

Biography: Lin Gu is a professor of the Beijing Laboratory of Electron Microscopy at the Institute of Physics, Chinese Academy of Sciences. He received B.E. from Tsinghua University, China in 2002, and Ph.D. in Material Science from Arizona State University, USA in 2005. He was a postdoctoral fellow at the Max Planck Institute for Metals Research from 2006-2009. Before joining the IOP, He was a research associate at Tohoku University. His current research focuses on the atomic-scale structure and electron structure of materials through aberration-corrected scanning transmission electron microscopy, particularly annular-bright-field imaging and electron energy loss spectroscopy. So far, he has published more than 300 papers (including 3 papers of Science, and more than 10 papers of Nature and its sub-journals, and more than 100 papers whose IF> 10), and these papers have been cited more than 10000 times.