Abstract
Sulfated metal oxide SO4 2−/Fe2O3 was prepared by a novel facile sol–gel method combined with a subsequent heating treatment process. The as-synthesized products were analyzed by XRD, FTIR, and FE-SEM. Compared with the unsulfated Fe2O3, the agglomeration of particles has been alleviated after the incorporation of SO4 2−. Interestingly, the primary particle size of the SO4 2−/Fe2O3 (about 5 nm) is similar to its normal counterparts even after the calcination treatment. More importantly, SO4 2−/Fe2O3 exhibits a porous architecture, which is an intriguing feature for electrode materials. When used as anode materials in Li-ion batteries, SO4 2−/Fe2O3 delivered a higher reversible discharge capacity (992 mAh g−1), with smaller charge transfer resistance, excellent rate performance, and better cycling stability than normal Fe2O3. We believed that the presence of SO4 2− and porous architecture should be responsible for the enhanced electrochemical performance, which could provide more continuous and accessible conductive paths for Li+ and electrons.
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Acknowledgements
A part of this work was sponsored by an innovative training program for college students in Shanghai, Shanghai University of Engineering Science (cs1604008) and supported by the Shanghai Municipal Education Commission (High-energy Beam Intelligent Processing and Green Manufacturing) and National Natural Science Foundation of China (11602134). Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from the NSF through the MRSEC program.
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Li, Z., Lv, Q., Huang, X. et al. Porous sulfated metal oxide SO4 2−/Fe2O3 as an anode material for Li-ion batteries with enhanced electrochemical performance. J Nanopart Res 19, 5 (2017). https://doi.org/10.1007/s11051-016-3709-2
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DOI: https://doi.org/10.1007/s11051-016-3709-2