Freeze-Drying-Assisted Synthesis of Hierarchically Porous Carbon/Germanium Hybrid for High-Efficiency Lithium-Ion Batteries

Authors

  • Dr. Ying Xiao,

    1. Key Laboratory of Cluster Science, Ministry of Education of China, Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Department of Chemistry, Beijing Institute of Technology, Beijing 100081 (P. R. China), Fax: (+86) 10-68918572
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  • Prof. Minhua Cao

    Corresponding author
    1. Key Laboratory of Cluster Science, Ministry of Education of China, Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Department of Chemistry, Beijing Institute of Technology, Beijing 100081 (P. R. China), Fax: (+86) 10-68918572
    • Key Laboratory of Cluster Science, Ministry of Education of China, Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Department of Chemistry, Beijing Institute of Technology, Beijing 100081 (P. R. China), Fax: (+86) 10-68918572

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Abstract

Herein, an approach is reported to prepare porous a carbon/Ge (C/Ge) hybrid. In this hybrid, Ge nanoparticles are closely embedded in a highly conductive and flexible carbon matrix. Such a hybrid features a high surface area (128.0 m2 g−1) and a hierarchical micropore–mesopore structure. When used as an anode material in lithium-ion batteries (LIBs), the as-prepared hybrid [C/Ge (60.37 %)] exhibits an improved lithium storage performance with regard to its capacity and rate capability compared to its counterparts. More specifically, it can maintain a specific capacity as high as 906 mAh g−1 at a high current density of 0.6 A g−1 after 50 cycles. The excellent lithium storage performance of the C/Ge (60.37 %) sample can be attributed to synergetic effects between the carbon matrix and Ge nanoparticles. The method we adopted is simple and effective, and can be extended to fabricate other nanomaterials.

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