Jiaxin Li(李加新,博士生), Wen Weiwei(温伟伟,硕士生), Mingzhong Zou(邹明忠,博士生), Lunhui Guan, Zhigao Huang(黄志高), MWNT-supported bifunctional catalyst of β-FeOOH nanospindles for enhanced rechargeable Li-O2 batteries, Journal of Alloys and Compounds 639, 428-434 (2015).
Abstract
A novel composite of β-FeOOH nanospindles coated on multi-walled carbon nanotubes (β-FeOOH/MWNTs) has been synthesized via a wet chemical method and used as electrocatalysts for the cathodes of Li-O2 batteries (LOBs). The β-FeOOH/MWNT cathodes can afford a high reversible capacity of 6000 mA h g−1 tested at 200 mA g−1 and cycle stability for 19 cycles with a reversible capacity of 600 mA h g−1 and good rate capability. The LOB performance should be benefited from the fast kinetics of electron transport through the MWNT support and the electro-catalytic activity provided by the β-FeOOH nanospindles. The preliminary result manifests that the composites of β-FeOOH/MWNTs are promising cathode electrocatalysts for LOBs.
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Jiaxin Li(李加新,博士生), Weiwei Wen(温伟伟,硕士生), Guigui Xu(许桂贵), Mingzhong Zou(邹明忠,博士生), Zhigao Huang(黄志高), Lunhui Guan, Fe-added Fe3C carbon nanofibers as anode for Li ion batteries with excellent low-temperature performance, Electrochimica Acta 153, 300-305 (2015).
Abstract
The poor conductivity of anodic carbon materials at low temperature hampers their high-level applications in Li ion batteries (LIBs). Introducing some reliable metals with good electrical conductivity into anodes could alleviate these problems. In this work, the novel composites of Fe-added Fe3C carbon nanofibers (Fe/Fe3C-CNFs) were synthesized via facile electrospinning method and used as anode materials for LIBs. The resulting anodes with Fe/Fe3C-CNF materials exhibited a high reversible capacity of 500 mAh g−1 tested at 200 mA g−1 even after 70 cycles and excellent performance at room temperature. Importantly, it delivered a high capacity of 250 mAh g−1 at 400 mA g−1 even after 55 cycles at a low temperature of −15 °C. The superior low-temperature electrochemical performance of the Fe/Fe3C-CNF anodes is associated with an improved effect of the highly conducting Fe at low temperature.
