Krammer, M., Schmid, A., Kubicek, M., & Fleig, J. (2023). Utilizing oxygen gas storage in rechargeable oxygen ion batteries. Journal of Power Sources, 577, Article 233167. https://doi.org/10.1016/j.jpowsour.2023.233167
Chemical capacitance; Mixed ionic electronic conducting oxide; Oxygen electrode; Oxygen ion battery; Solid oxide cell
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Abstract:
The potentiality of mixed conducting oxides as electrodes in rechargeable oxygen ion batteries is exemplified by impedance measurements and galvanostatic cycling. Porous La0.6Sr0.4CoO3−δ (LSC) thin film electrodes were prepared on yttria-stabilized zirconia electrolytes with a dense ZrO2 blocking layer on top to prevent oxygen exchange with the measurement atmosphere. Half cell measurements performed between 350 and 460 °C revealed electrode capacities up to 135 mAh/cm3. Measured charge/voltage curves are compared with those reconstructed from chemical capacitance values and with model calculations. Two different storage mechanisms were identified: At low potentials (<0.05 V vs. 1 bar O2), mainly oxygen vacancies become filled during charging. At higher potentials, however, O2 gas formation (>500 bar at potentials >0.1 V) in closed pores dominates charge/voltage characteristics, which can be described by calculations based on a real gas model. Moreover, full oxygen ion batteries were investigated, where such a porous LSC electrode served as cathode and a dense La0.9Sr0.1CrO3−δ (LSCr) film was used as anode. Owing to the much lower reducibility of LSCr, a cell voltage of 1.2 V was obtained at 460 °C with electrode related capacities and energy densities up to 100 mAh/cm3 and 53 mWh/cm3, respectively.
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Research Areas:
Materials Characterization: 50% Surfaces and Interfaces: 50%
