Characteristics of Fe-air battery using Y2O3-stabilized-ZrO2 electrolyte with Ni–Fe electrode and Ba0.6La0.4CoO3-δ electrode operated at intermediate temperature

Abstract

The charge-discharge operation of a Fe-air battery using YSZ electrolyte at lower temperature was investigated using the NiFe-91 (Ni:Fe =90 :10 wt%) bimetal electrode as the fuel electrode and the Ba 0.6 La 0.4 CoO 3-δ (BLC) oxide electrode as the air electrode in this work. It was found that the total resistance of the cell using the NiFe-91 and BLC electrode was about 100 times smaller than that of the cell using the conventional Pt electrode, owing to its significantly small electrode resistance. It was also found that the 10 cycle charge-discharges were achieved at 600C by using these electrodes, and the capacity of about 700 mAh/g-Fe and energy density of 600 mWh/g-Fe were also retained during 8 cycles. These results showed a significant potential; the low temperature operation of the battery using YSZ electrolyte is sufficiently possible by choosing an appropriate electrode. However, the low stability of the NiFe-91 electrode, which is due to the agglomeration, was also found in this work.

Finite Element Model for Coupled Diffusion and Elastoplastic Deformation during High-Temperature Oxidation of Fe to FeO

“…5,6 Iron is an attractive energy storage material because it is naturally abundant, inexpensive, and environmentally benign, but during redox cycling it degrades due to morphological changes arising from the redox processes. Experimental studies have shown the material degradation to be driven by sintering, [7][8][9] accelerated by the large molar volume changes of oxidation/reduction transformations, and irreversible structural changes arising from a large imbalance between Fe 2+ and O 2− diffusional fluxes, leading to formation of Kirkendall microporosity. [10][11][12] Combined, these mechanisms lead to material densification and formation of an encasing, gas-blocking layer, or shell, both of which hinder the gas transport necessary for acceptable redox kinetics.…”