(Invited) Phase Evolution and Interfacial Strain in Electrode Materials for Batteries

Abstract

Advanced (scanning) transmission electron microscopy ((S)TEM) techniques have been intensively applied to study the materials for energy storage. With/Combining different TEM techniques, including in-situ TEM and diffraction, HAADF-STEM, and STEM-electron energy-loss spectroscopy, researchers are able to probe local structural and chemical information of electrode materials, at a resolution of nanoscale. This talk will focus on my recent work on using in-situ and analytical TEM to characterize the conversion-reaction oxide material (Fe3O4) for electrode of lithium ion batteries [1-3]. The dynamical process of the redox reaction of Fe3O4 revealed by in-situ TEM may help us to understand how reaction pathways affect the batteries’ kinetic properties. Reference s : [1] He K. et al., Visualizing non-equilibrium lithiation of spinel oxide via in situ transmission electron eicroscopy, Nature Communications, 7,11441 (2016)[2] Hwang S. et al., Strain coupling of conversion-type Fe3O4 thin film for lithium ion battery, Angewandte Chemie, 56,7813, (2017)[3] Li J. et al. Phase evolution of conversion-type electrode for lithium ion batteries, Nature Communications, 10,2224 (2019)