Silicon–Graphene Composite Anodes for High-Energy Lithium Batteries

Authors

  • Dr. Jian-Guo Ren,

    1. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices & Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123 (PR China)
    2. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong (PR China)
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  • Qi-Hui Wu,

    1. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices & Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123 (PR China)
    2. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong (PR China)
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  • Guo Hong,

    1. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices & Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123 (PR China)
    2. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong (PR China)
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  • Prof. Wen-Jun Zhang,

    1. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong (PR China)
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  • Dr. Huiming Wu,

    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
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  • Khalil Amine,

    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
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  • Junbing Yang,

    Corresponding author
    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
    • Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
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  • Prof. Shuit-Tong Lee 

    Corresponding author
    1. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices & Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123 (PR China)
    • Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices & Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123 (PR China)
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    • Formerly at COSDAF.


Abstract

A chemical vapor deposition process is introduced to prepare silicon (Si)–graphene composite anode materials for lithium-ion batteries. Highly ordered crystalline Si particles are deposited onto graphene sheets by using a liquid chlorosilane as Si source. The Si–graphene composite exhibits high utilization of Si in charge–discharge processes. The capacity retention of 90 % after 500 full cycles and an average Coulombic efficiency in excess of 99.5 % are achieved in half cells. Moreover, atomic layer deposition (ALD) Al2O3 coating is directly applied on the Si-graphene electrode, which greatly suppresses the side reactions between the electrode and electrolyte, resulting in the enhancement in initial Coulombic efficiency and reversible capacity. Finally, a 3.6 V full cell device is demonstrated, which works very well by combining a Si-graphene anode with a Li-excess layer-structured composite Li1.2Ni0.2Mn0.6O2 cathode. This approach is very promising for realizing a high-energy lithium-ion battery.

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