[17p-Z11-1~6] Forefront and prospects of ion beam analysis

[17p-Z11-1] In-operando Observation of Lithium Ion Migration in Lithium Battery by ToF-ERD

〇Bun Tsuchiya¹, Taiki Usami¹, Ryo Kato¹, Kohtaku Suzuki², Tomoko Sasaki³ (1.Meijo Univ., 2.Wakasa-w. Ene. Res., 3.Tohoku Univ.)

Keywords:Lithium, Time-of-Flight Elastic Recoil Detection, In-operando Observation

The depth distributions of lithium (Li) concentrations near each Au/LiCoO₂/LATP and Pt/LATP interface in an all-solid-state Li⁺ ion battery (Au/LiCoO₂/Li_1.4Al_0.4Ge_0.7Ti_0.9P₃O₁₂(LATP)/Pt) were in-operando observed with reliable depth resolution in a few nm scale by applying various voltages in a vacuum using Time-of-Flight Elastic Recoil Detection (ToF-ERD) with 9.0-MeV Cu¹⁰⁺ ion-probe beams. It made a possible to clarify well the Li⁺ ion migration from the LiCoO₂ positive electrode to LATP negative one during the applied voltages and the static Li concentrations around their interfaces.