Direct measurement of nanoscale lithium diffusion in solid battery materials using radioactive tracer of Li

放射性Liトレーサーを用いたリチウム電池固体材料中のリチウム拡散直接測定

石山 博恒*; Jeong, S.-C.*; 渡辺 裕*; 平山 賀一*; 今井 伸明*; Jung, H. S.*; 宮武 宇也*; 小柳津 充広*; 長 明彦  ; 乙川 義憲  ; 松田 誠  ; 西尾 勝久   ; 牧井 宏之   ; 佐藤 哲也   ; 桑田 直明*; 河村 純一*; 上野 秀樹*; Kim, Y. H.*; 木村 創大*; 向井 もも*

Ishiyama, Hironobu*; Jeong, S.-C.*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Jung, H. S.*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Osa, Akihiko; Otokawa, Yoshinori; Matsuda, Makoto; Nishio, Katsuhisa; Makii, Hiroyuki; Sato, Tetsuya; Kuwata, Naoaki*; Kawamura, Junichi*; Ueno, Hideki*; Kim, Y. H.*; Kimura, Sota*; Mukai, Momo*

We have developed an in situ and nanoscale Li diffusion measurement method in Li battery materials using an -emitting radioactive Li tracer. In this method, while implanting a low-energy (8 keV) Li beam, the particles emitted at a small angle (10) relative to the sample surface were detected as a function of time. Measurement for Li diffusion coefficients in a spinel phase LiMnO (LMO) thin film has been started, which is used as an electrode in a Li ion secondary battery. An obvious Li diffusion effect in LMO was observed at the sample temperature of 623 K, and the further measurement is underway.