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Effects of carbon content on the electrochemical properties of spherical pyrrhotine/carbon nanocomposites

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Abstract

Spherical pyrrhotine/carbon nanocomposites with different carbon contents were synthesized by a solvothermal method followed by heat treatment. The carbon content of the nanocomposites was controlled by changing the amount of the carbon precursor. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM); the influence of carbon layer thickness on the electrochemical performance was analyzed by charge/discharge cycling and X-ray photoelectron spectroscopy (XPS). Results show that the moderate carbon layer displays a positive effect in improving reversible capacity and the rate capability. The optimal carbon content in the pyrrhotine/carbon nanocomposites was about 15 wt.%, which can retain a high reversible capacity of 689.5 mAh/g even after 50 cycles at 0.1 C and an excellent rate capability of 393.4 mAh/g at 5 C. The synthesized nanocomposites show a promising potential as a novel anode material for lithium-ion batteries.

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Acknowledgments

This work is financially supported by the Natural Science Foundation of Shandong Province (No. ZR2014EMP012 and No. ZR2015EL001) and Binzhou University (No. BZXYG1603).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Binzhou University, Binzhou, 256603, China

    Xiaodong Zheng

  2. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Xiaodong Zheng

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  1. Xiaodong Zheng
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Correspondence to Xiaodong Zheng.

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Zheng, X. Effects of carbon content on the electrochemical properties of spherical pyrrhotine/carbon nanocomposites. Ionics 23, 907–915 (2017). https://doi.org/10.1007/s11581-016-1881-0

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  • DOI: https://doi.org/10.1007/s11581-016-1881-0

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