Practical analysis of Li distribution by EELS: Analysis of Li distribution by EELS

Practical measurement of the Li distribution in Li-ion battery electrode materials is demonstrated using a scanning transmission electron microscopy-electron energy loss spectroscopy (EELS) spectrum imaging method. Lithium distribution images were obtained for LiCoO2 positive electrode material using conventional software, Digital Micrograph (Gatan), for STEM-EELS spectrum imaging data. Some data processing methods using Li K-edge EELS spectra were examined to obtain a Li distribution image for LiCoO2. A quantitative method was successfully applied to Li2TiO3, while it was not suitable for LiCoO2. Issues regarding the measurement of Li distributions in electrode materials are discussed. Copyright (c) 2016 John Wiley & Sons, Ltd.