[14a-B12-1~11] 22.1 Joint Session M "Phonon Engineering"

[14a-B12-9] Thermoelectric properties of P2-type Na_xCoO₂

〇Yuya Fukuzumi¹, Wataru Kobayashi^1,2, Yutaka Moritomo^1,2,3 (1.Grad. Sch. Pure and Appl. Sci., Univ. Tsukuba, 2.Fac. Pure and Appl. Sci., Univ. Tsukuba, 3.CiRfSE)

Keywords:thermoelectric conversion, secondary battery

We focus on thermoelectric effect that utilizes redox reaction at electrode material of the ion secondary battery. To apply a large temperature difference (ΔT), we have fabricated a new thermocell, and measured voltage (ΔV) against ΔT in P2-type Na_xCoO₂. In this presentation, we discuss sodium-concentration (x) dependence of the Seebeck coefficient (ΔV/ΔT).