[13p-A405-1~17] 12.2 Characterization and Materials Physics

[13p-A405-14] in situ IR measurement of Na_1.24Co[Fe(CN)₆]_0.81

〇(M2)Toshiaki Moriya¹, Hideharu Niwa^1,2,3, Takayuki Shibata⁴, Yutaka Moritomo^1,2,3 (1.Grad. Sch. Pure and Appl. Sci., Univ. Tsukuba, 2.Fac. Pure and Appl. Sci., Univ. Tsukuba, 3.TREMS, Univ. Tsukuba, 4.Natl. Inst. of Tech., Gunma College)

Keywords:secondary battery, infrared absorption spectroscopy, prussian blue analogues

Prussian blue analogues (PBAs), consisting of cyano-bridged transition metals, are promising cathode materials for Na-ion secondary batteries. Redox potentials of Na_xCo[Fe(CN)₆]_0.81 change at low and high temperatures. The valence state of Na_xCo[Fe(CN)₆]_0.81 was investigated by in situ infrared absorption spectroscopy under the temperature and potential control. It was found that oxidation reaction at low temperature, Co is oxidized at low potential plateau and Fe oxidized at high potential plateau.