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Polymer-free Vertical Transfer of Silicon Nanowires and their Application to Energy Storage

Authors

  • Dr. Han-Jung Kim,

    1. Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)
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  • Dr. Jihye Lee,

    1. Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)
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  • Sang Eon Lee,

    1. Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)
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  • Wanjung Kim,

    1. School of Chemical Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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  • Hwan Jin Kim,

    1. School of Chemical Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
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  • Dr. Dae-Geun Choi,

    Corresponding author
    1. Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)
    • Dae-Geun Choi, Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)

      Jong Hyeok Park, School of Chemical Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)

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  • Prof. Jong Hyeok Park

    Corresponding author
    1. School of Chemical Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)
    • Dae-Geun Choi, Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea)

      Jong Hyeok Park, School of Chemical Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 (Republic of Korea)

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Abstract

Silicon nanowires (SiNWs) for use as lithium-ion battery (LIB) anode materials have been studied for their one-dimensional (1D) properties and ability to accommodate large volume changes and avoid rapid capacity fading during cycling. Although the vertical transfer of SiNWs from their original substrate onto a conducting electrode is very important, to date, there has been no report of a direct integration method without polymer binders. Here, we propose for the first time a vertical transfer method for SiNWs grown on a Si substrate directly to the current-collecting electrode without using a polymer adhesive for the use as a binder-free LIB anode. The vertical SiNWs produced using a low-cost wafer-scale metal-assisted chemical etching (MaCE) process have been successfully transferred directly to a copper electrode coated with a thin Ag layer by using a simple hot pressing method. When evaluated as an LIB anode without using conventional polymeric binder and a conducting additive, the transferred vertically aligned SiNWs showed a high specific capacity (≈2150 mAh g−1) and excellent rate performance. It is believed that the anode-manufacturing process is simple and fast, thus enabling a large-scale production that is of low-cost, broadly applicable, and provides new avenues for the rational engineering of Si-based electrode materials with enhanced power density and conductivity.

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