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Combination of Fe-Mn based Li-rich cathode materials and conducting-polymer polypyrrole nanowires with high rate capability

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Abstract

The polypyrrole (PPy) nanowires are conducting 1D materials, which can significantly improve the electrical conductivity of the composites. A novel Li1.26Fe0.22Mn0.52O2 (LFMO) @ PPy nanowire composites were synthesized by simply ultrasonic dispersing LFMO and PPy nanowires in aqueous ethanol. The structure and morphology of pristine LFMO and LFMO@PPy are investigated by XRD, SEM, and TEM. The elemental mapping and FTIR results demonstrate the conductive network of PPy nanowires exists in the composites and the LFMO particles uniformly distribute on the PPy nanowires. LFMO combined with PPy nanowires exhibits better rate capability, higher capacity, coulombic efficiency, and cycleability than the pristine. The rate performance of composites with 10 wt% PPy nanowires shows the discharge capacities of 132.2 mAh/g and 98 mAh/g at 1C and 3C rate after 50 cycles, respectively. Electrochemical impedance spectroscopy test suggests that the conductive PPy nanowires can significantly decrease the charge-transfer resistance of LFMO. The composite with 10 wt% PPy nanowires shows a discharge capacity retention of 71% after 50 cycles at 1C, while the pristine sample only has 50% capacity retention.

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Acknowledgments

This work has been supported by the “Natural Science Foundation of China”, No. 21301013.

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Authors and Affiliations

  1. Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100124, People’s Republic of China

    Yujuan Zhao, Zhi Lv, Yang Wang & Tao Xu

  2. Guyue New Material Research Institute, Beijing University of Technology, Beijing, 100124, People’s Republic of China

    Yujuan Zhao

  3. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, People’s Republic of China

    Yujuan Zhao

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  1. Yujuan Zhao
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  2. Zhi Lv
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  4. Tao Xu
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Correspondence to Yujuan Zhao.

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Zhao, Y., Lv, Z., Wang, Y. et al. Combination of Fe-Mn based Li-rich cathode materials and conducting-polymer polypyrrole nanowires with high rate capability. Ionics 24, 51–60 (2018). https://doi.org/10.1007/s11581-017-2166-y

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  • DOI: https://doi.org/10.1007/s11581-017-2166-y

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