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Si-Encapsulating Hollow Carbon Electrodes via Electroless Etching for Lithium-Ion Batteries

Authors

  • Yuwon Park,

    1. School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-744, Korea
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Nam-Soon Choi,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Sangjin Park,

    1. School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-744, Korea
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  • Seung Hee Woo,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea
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  • Soojin Sim,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea
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  • Bo Yun Jang,

    1. Korea Institute of Energy Research (KIER), Daejon, 305-343, Korea
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  • Seung M. Oh,

    1. School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-744, Korea
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  • Soojin Park,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea
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  • Jaephil Cho,

    Corresponding author
    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea
    • Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea.
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  • Kyu Tae Lee

    Corresponding author
    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea
    • Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, KIER-UNIST Advanced Center for Energy, Ulsan, 689-798, Korea.
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Abstract

Remarkable improvements in the electrochemical performance of Si materials for Li-ion batteries have been recently achieved, but the inherent volume change of Si still induces electrode expansion and external cell deformation. Here, the void structure in Si-encapsulating hollow carbons is optimized in order to minimize the volume expansion of Si-based anodes and improve electrochemical performance. When compared to chemical etching, the hollow structure is achieved via electroless etching is more advanced due to the improved electrical contact between carbon and Si. Despite the very thick electrodes (30 ∼ 40 μm), this results in better cycle and rate performances including little capacity fading over 50 cycles and 1100 mA h g−1 at 2C rate. Also, an in situ dilatometer technique is used to perform a comprehensive study of electrode thickness change, and Si-encapsulating hollow carbon mitigates the volume change of electrodes by adoption of void space, resulting in a small volume increase of 18% after full lithiation corresponding with a reversible capacity of about 2000 mA h g−1.

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