Critical Thickness of SiO2 Coating Layer on Core@Shell Bulk@Nanowire Si Anode Materials for Li-Ion Batteries

Authors

  • Soojin Sim,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science & Technology (UNIST), Ulsan, S. Korea, 689–798
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  • Pilgun Oh,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science & Technology (UNIST), Ulsan, S. Korea, 689–798
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  • Soojin Park,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science & Technology (UNIST), Ulsan, S. Korea, 689–798
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  • Jaephil Cho

    Corresponding author
    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science & Technology (UNIST), Ulsan, S. Korea, 689–798
    • Interdisciplinary School of Green Energy, Ulsan National Institute of Science & Technology (UNIST), Ulsan, S. Korea, 689–798.
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Abstract

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Amorphous SiO2 coating layers with thicknesses of ca. 2, 7, 10, and 15 nm are introduced into bulk@nanowire core@shell Si particles via direct thermal oxidation at 650–850 °C. Of the coated samples, Si with a coating thickness of ca. 7 nm has the best electrochemical performance. This sample shows an initial discharge capacity of 2279 mA h g−1 with a Coulombic efficiency of 92% and displays 83% capacity retention after 50 cycles at 0.2C rate.

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