[26a-F308-1~8] 7.2 Applications and technologies of electron beams

[26a-F308-1] Toward Operando Observation of All-Solid-State Li-Ion Battery by Scanning Transmission Electron Microscopy

〇(M2)Yuma Takagi¹, Kohei Aso¹, Hiroki Ito², Masaaki Hirayama², Ryoji Kanno², Yoshifumi Oshima¹ (1.JAIST, 2.Tokyo Tech Univ.)

Keywords:Scanning transmission electron microscope, Li-Ion Battery, Moire

Observation of moire method using a scanning transmission electron microscope (STEM) is proposed as a method for detecting Li-ion conduction inside LiCoO₂, which is a typical positive electrode material for all-solid-state Li-ion batteries, on a nanometer scale.The STEM moire method is expected to reduce sample damage because it detects a slight strain distribution with low electron beam irradiation, and it also has high temporal resolution and high spatial resolution.LiCoO₂ thin film sample grown on a SrTiO₃ substrate was observed for verification of battery sample observation by the STEM moire method.STEM moire pattern caused by the interference between the scanning grating spacing and the LiCoO₂(003) lattice spacing is observed.