“Metal-air” batteries have garnered much attention in recent years due to their high intrinsic specific energy and use of inexhaustible and storage-free oxygen source -air- for the “metal-oxygen” reaction. In this study, we report theperformance of a new type of all solid-state “iron-air” battery operated at 550°C. The results show that CeO2 nanoparticles incorporated into the Fe-Fe3O4 redox-couple can improve the specific energy (Wh/kg) and round trip efficiency by 15% and 29%, respectively, over the baseline Fe-Fe3O4 battery. Use of supported Fe-Fe3O4 nanoparticles as the redox couple can increase the specific energy and round-trip efficiency by 13% and 48% over the baselinebattery, respectively. However, the nanoparticle redox-couple is susceptible to thermal coarsening under operating conditions, causing cycle stability problem. Future research needs to focus on improving battery's performance and stability by utilizing thin-film electrolyte and high-performance and stable electrodes, and preventing thermal growth of active redox couple nanoparticles. A most recent testing on an optimized battery component has shown promising results: discharge specific energy can reach 91.0% of the maximum theoretical specific energy with a round-trip efficiency of 82.5%.
Published in Journal of The Electrochemical Society, Volume 160, Issue 8, 2013, pages A1241-A1247.
©Journal of The Electrochemical Society (2013), The Electrochemical Society.
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Publisher’s Version: http://dx.doi.orgg/10.1149/2.085308jes
Zhao, X., Gong, Y., Li, X., Xu, N., & Huang, K. (2013). Performance of Solid Oxide Iron-Air Battery Operated at 550°C. Journal of The Electrochemical Soceity, 160 (8), A1241 - A1247. http://dx.doi.org/10.1149/2.085308jes