[12p-D221-1~9] 9.4 Thermoelectric conversion

[12p-D221-9] Tertiary battery with use of phase transition

〇Takayuki Shibata¹, Hiroki Iwaizumi², Yuya Fukuzumi², Yutaka Moritomo^2,3 (1.NIT, Gunma College, 2.Univ. of Tsukuba, 3.TREMS, Univ. of Tsukuba)

Keywords:Tertiary battery, Energy harvest, Phase transition

We are proposing a "tertiary batteries" that are self-charged due to temperature change of the outside. These batteries consist of two kinds of secondary-ion batteries materials with the difference in the temperature coefficient of redox potential α(= dV/dT). In this study, we investigated the cell properties in Na_xCo[Fe(CN)₆]_0.823.5H₂O(NCF82)/Na_xCo[Fe(CN)₆]_0.902.9H₂O(NCF90) tertiary battery. NCF82 is a battery material showing in phase transition. We found that cell voltage of the NCF82/NCF90 cell steeply increases from 0 mV to 120 mV around 320 K with increase in the cell temperature.