[19p-H111-1~22] 6.3 Oxide electronics

[19p-H111-18] EXAFS analysis of O3-type Na_xCo_1-yFe_yO₂

〇Wataru Kobayashi^1,2,4, Kaoru Amaha³, Shota Akama¹, Hideharu Niwa^1,2,4, Yutaka Moritomo^1,2,4 (1.Grad. Sch. Pure and Appl. Sci., Univ. Tsukuba, 2.Fac. Pure and Appl. Sci., Univ. Tsukuba, 3.Sch. Sci. and Eng., Univ. Tsukuba, 4.CiRfSE, Univ. Tsukuba)

Keywords:sodium-ion-secondary battery,Extended X-ray Absorption Fine Structure,local structure

Powder samples of O3-type Na_xCo_1-yFe_yO₂ were prepared, and x-ray diffraction pattern (XRD) and x-ray absorption fine structure (XAFS) were measured at SPring-8 BL02B2 and BL01B1 to investigate local structures around Co and Fe atoms in Na_xCo_1-yFe_yO₂. By means of EXAFS analysis, M-O and M-M’ (M=Co, Fe, M’=Co_1-yFe_y) distances were evaluated.