Flexible Dimensional Control of High-Capacity Li-Ion-Battery Anodes: From 0D Hollow to 3D Porous Germanium Nanoparticle Assemblies

Authors

  • Mi-Hee Park,

    1. School of Energy Engineering and Converging Research Center for Innovative Battery Technologies Ulsan National Institute of Science & Technology 689-798 Ulsan (Korea)
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  • Kitae Kim,

    1. Battery R&D, LG Chem, Ltd. 104-1 Moonji-dong, Yuseong-gu, Daejeon 305-380 (Korea)
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  • Jeyoung Kim,

    1. Battery R&D, LG Chem, Ltd. 104-1 Moonji-dong, Yuseong-gu, Daejeon 305-380 (Korea)
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  • Jaephil Cho

    Corresponding author
    1. School of Energy Engineering and Converging Research Center for Innovative Battery Technologies Ulsan National Institute of Science & Technology 689-798 Ulsan (Korea)
    • School of Energy Engineering and Converging Research Center for Innovative Battery Technologies Ulsan National Institute of Science & Technology 689-798 Ulsan (Korea).
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Abstract

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Simple physical blending of SiO2and ethyl-capped Ge gels leads to flexible dimensional control of Ge nanoparticles, and an increasing weight fraction of the latter leads to ordered 3D porous nanoparticle assemblies (see figure). The long-range ordering of the 3D porous Ge nanoparticles and their very thin pore wall thicknesses (<20 nm) induce excellent cycling performance, showing only a 2% capacity decrease after 100 cycles.

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