Enhanced capacity for lithium–air batteries using LaFe0.5Mn0.5O3–CeO2 composite catalyst |
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Authors: | Tiejun Meng Mahbuba Ara Lixin Wang Ratna Naik K Y Simon Ng |
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Affiliation: | 1. Department of Chemical Engineering and Materials Science, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI, 48202, USA 2. Department of Physics and Astronomy, Wayne State University, 666 W. Hancock, Detroit, MI, 48201, USA
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Abstract: | LaFe0.5Mn0.5O3 and Ce-incorporated LaFe0.5Mn0.5O3 catalysts for Li–air batteries were synthesized by co-precipitation (CP) and micro-emulsion methods with the increasing Ce/(La+Ce) ratios from 0 to 0.5. Ce has a low solubility in LaFe0.5Mn0.5O3 perovskite lattices. Instead of forming single-phase La1?x Ce x Fe0.5Mn0.5O3 perovskite, a multi-phase LaFe0.5Mn0.5O3–CeO2 composite was obtained even for Ce/(La+Ce) = 0.05. Such catalysts were used in the cathode of Li–air batteries and the discharge test showed that LaFe0.5Mn0.5O3–CeO2 composite catalyst can effectively improve the specific capacity with the highest capacity of ~4700 mAh/g for Ce/(La+Ce) = 0.05 (by CP). There is also a 0.05 V increase in discharge voltage compared with the reference cell without catalyst, with the discharge voltage plateau at ~2.75 V. The overall ranking in terms of capacity was Ce/(La+Ce) = 0.05 > Ce/(La+Ce) = 0.1 > Ce/(La+Ce) = 0.5 > Ce/(La+Ce) = 0. The capacity increase for Ce/(La+Ce) = 0.05 and 0.1 samples is attributed to the enhanced oxygen storage/release capability and the increased conductivity with the incorporation of CeO2. |
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