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Improved cycle stability of Fe–air solid state oxide rechargeable battery using LaGaO3-based oxide ion conductor

2014; Elsevier BV; Volume: 262; Linguagem: Inglês

10.1016/j.jpowsour.2014.03.125

1873-2755

Atsushi Inoishi, Takaaki Sakai, Young Wan Ju, Shintaro Ida, Tatsumi Ishihara,

Advanced Battery Materials and Technologies

The effect of operating temperature on the discharge potential and cycle stability of an Fe–air solid oxide rechargeable battery was studied. An Fe–air cell operated at 773 K exhibited the highest discharge potential (1.07 V) and high cycle stability with a current density of 5 mA cm−2. The high discharge potential at lower operating temperatures is due to aggregation of the anode and Fe powder being suppressed. The high redox cycle stability of the Ni–Fe-based anode at 773 K is explained by the small volume change with suppressed aggregation under low-temperature operation. Electrochemical charge–discharge measurements at 773 K revealed excellent cycle stability for 30 cycles with a high energy density (round trip efficiency >80%).