[17p-419-1~10] 6.3 Oxide electronics

[17p-419-8] Local electronic states of Co–Fe Prussian blue analogues for Na-ion battery cathodes

〇Hideharu Niwa^1,2,3, Masamitsu Takachi¹, Jun Okamoto⁴, Wen-Bin Wu⁴, Di-Jing Huang⁴, Yutaka Moritomo^1,2,3 (1.Grad. Sch. Pure and Appl. Sci., Univ. Tsukuba, 2.Fac. Pure and Appl. Sci., Univ. Tsukuba, 3.CiRfSE, Univ. Tsukuba, 4.NSRRC)

Keywords:Sodium-ion secondary battery, soft x-ray spectroscopy

Rechargeable sodium-ion secondary battery (SIB) is a significant energy technology not only for information industry but also motor industry . Prussian blue analogues (PBA), i.e., A_xM[Fe(CN)₆]_y (A and M are alkali and transition metals, respectively), have been intensively investigated as cathode materials for SIBs. To truly comprehend the redox-reaction mechanism in SIB, the local electronic states around the M site should be experimentally clarified. The purpose of this study is to determine the local electronic states around Co on the same crystallographic site in Co-Fe PBA against the Na concentration by means of the high-resolution resonant soft X-ray emission spectroscopy.