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Issue 43, 2013
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A graphene-wrapped silver–porous silicon composite with enhanced electrochemical performance for lithium-ion batteries

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Abstract

A graphene-wrapped silver–porous silicon composite has been prepared and used as the anode material in lithium-ion batteries (LIBs). Porous silicon (pSi) prepared through a magnesiothermic reduction of mesoporous silica MCM-41 was surface-modified by Ag nanoparticles formed via the thermal decomposition of AgNO3 and then graphene nanosheets (GNS) generated through the thermal reduction of graphene oxide. The obtained Ag–pSi/GNS composite exhibits a distinctly high reversible specific capacity, long cycling performance and super rate capability. An initial capacity as high as 3531 mA h g−1 is delivered at 0.1 A g−1, whereas at a current density of 32 A g−1, a specific capacity of 1241 mA h g−1, more than three times higher than the theoretical capacity of the graphite anode, is still retained for 50 cycles. The superior electrochemical performance demonstrates that this Ag–pSi/GNS composite is a promising electrode material for high-performance LIBs.

Graphical abstract: A graphene-wrapped silver–porous silicon composite with enhanced electrochemical performance for lithium-ion batteries

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Publication details

The article was received on 06 Aug 2013, accepted on 06 Sep 2013 and first published on 09 Sep 2013


Article type: Paper
DOI: 10.1039/C3TA13092D
Citation: J. Mater. Chem. A, 2013,1, 13648-13654
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    A graphene-wrapped silver–porous silicon composite with enhanced electrochemical performance for lithium-ion batteries

    F. Du, K. Wang, W. Fu, P. Gao, J. Wang, J. Yang and J. Chen, J. Mater. Chem. A, 2013, 1, 13648
    DOI: 10.1039/C3TA13092D

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