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Issue 31, 2013
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In situ grown graphene-encapsulated germanium nanowires for superior lithium-ion storage properties

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Abstract

Alloying anode materials (Si, Ge, Sn etc.) in lithium-ion batteries usually suffer from a remarkable loss of capacity during the charge–discharge cycling. Herein, homogeneous in situ-grown graphene-encapsulated Ge nanowires are successfully achieved by a simple, completely catalyst-free route via arc-discharge. The Ge@G composite is composed of a graphene sheath and a metallic Ge nanowire core. This unique composite of graphene-encapsulated Ge nanowires is an ideal anode material for lithium ion storage. It can exhibit excellent electrochemical performance with a reversible specific capacity of 1400 mA h g−1 after 50 cycles at a current density of 1600 mA g−1 (the theoretical specific capacity of Ge is 1624 mA h g−1). These encouraging results demonstrate that arc-discharge synthesis provides efficient graphene encapsulation of Ge nanowires, and graphene encapsulation is a feasible solution to protect electrode materials for lithium-ion storage.

Graphical abstract: In situ grown graphene-encapsulated germanium nanowires for superior lithium-ion storage properties

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Publication details

The article was received on 01 Apr 2013, accepted on 29 May 2013 and first published on 29 May 2013


Article type: Paper
DOI: 10.1039/C3TA11313B
Citation: J. Mater. Chem. A, 2013,1, 8897-8902

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    In situ grown graphene-encapsulated germanium nanowires for superior lithium-ion storage properties

    C. Wang, J. Ju, Y. Yang, Y. Tang, J. Lin, Z. Shi, R. P. S. Han and F. Huang, J. Mater. Chem. A, 2013, 1, 8897
    DOI: 10.1039/C3TA11313B

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