Facile Synthesis of Ge@C Core-Shell Nanocomposites for High-Performance

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Journal Article
Chemistry An Asian Journal, 2013, 8 (12), pp. 3142 - 3146
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Herein, we report a facile and 'green' synthetic route for the preparation of Ge@C core-shell nanocomposites by using a low-cost Ge precursor. Field-emission scanning electron microscopy and transmission electron microscopy analyses confirmed the coreshell nanoarchitecture of the Ge@C nanocomposites, with particle sizes ranging from 60 to 100 nm. Individual Ge nanocrystals were coated by a continuous carbon layer, which had an average thickness of 2 nm. When applied as an anode materials for lithium-ion batteries, the Ge@C nanocomposites exhibited a high initial discharge capacity of 1670 mAhg-1 and superior rate capability. In particular, Ge@C nanocomposite electrodes maintained a reversible capacity of 734 mAhg-1 after repeated cycling at a current density of 800 mAg-1 over 100 cycles.
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