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Issue 28, 2013
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Germanium–tin alloy nanocrystals for high-performance lithium ion batteries

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Abstract

Germanium–tin (Ge1−xSnx) alloy nanocrystals were synthesized using a gas-phase laser photolysis reaction of tetramethyl germanium and tetramethyl tin. A composition tuning was achieved using the partial pressure of precursors in a closed reactor. For x < 0.1, cubic phase alloy nanocrystals were exclusively produced without separation of the tetragonal phase Sn metal. In the range of x = 0.1–0.4, unique Ge1−xSnx–Sn alloy–metal hetero-junction nanocrystals were synthesized, where the Sn metal domain becomes dominant with x. Thin graphitic carbon layers usually sheathed the nanocrystals. We investigated the composition-dependent electrochemical properties of these nanocrystals as anode materials of lithium ion batteries. Incorporation of Sn (x = 0.05) significantly increased the capacities (1010 mA h g−1 after 50 cycles) and rate capabilities, which promises excellent electrode materials for the development of high-performance lithium batteries.

Graphical abstract: Germanium–tin alloy nanocrystals for high-performance lithium ion batteries

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Publication details

The article was received on 01 Apr 2013, accepted on 14 May 2013 and first published on 15 May 2013


Article type: Paper
DOI: 10.1039/C3CP51366A
Citation: Phys. Chem. Chem. Phys., 2013,15, 11691-11695
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    Germanium–tin alloy nanocrystals for high-performance lithium ion batteries

    Y. J. Cho, C. H. Kim, H. S. Im, Y. Myung, H. S. Kim, S. H. Back, Y. R. Lim, C. S. Jung, D. M. Jang, J. Park, S. H. Lim, E. H. Cha, K. Y. Bae, M. S. Song and W. I. Cho, Phys. Chem. Chem. Phys., 2013, 15, 11691
    DOI: 10.1039/C3CP51366A

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