[19a-P1-1~11] 1.4 Energy conversion, storage, resources and environment

[19a-P1-8] Observation of charge/discharge process in cathode material of all-solid-state Li-ion battery using operando photoelectron spectromicroscopy

〇Keishi Akada¹, Takaaki Sudayama², Daisuke Asakura², Hirofumi Matsuda^2,3, Eiji Hosono², Naoka Nagamura⁴, Koji Horiba⁵, Masaharu Oshima⁶, Yoshihisa Harada^1,6 (1.ISSP, The Univ. of Tokyo, 2.AIST, 3.AIST-UTokyo OPERANDO-OIL, 4.NIMS, 5.KEK, 6.SRRO, The Univ. of Tokyo)

Keywords:Li-ion-battery, Operando, Photoelectron Spectroscopy

To understand the operation mechanisms of Li-ion-batteries (LIBs), Operando spectromicroscopy with a high spatial resolution is of particular importance because that method can detect changes of various electronic structures which correlate closely with the lithiation/delithiation, in the one particle. Here, we developed an all-solid-state LIB cell and obtained operando photoelectron spectra of cathode at charge/discharge states using the 3DnanoESCA station with a spatial resolution of less than 100 nm. In the presentation, we will show photoelectron images for one single-crystalline LiCoO₂ particle, and obtained pin-point core-level spectra for selected points in the particle.