Facile synthesis of Ge@C core-shell nanocomposites for high-performance lithium storage in lithium-ion batteries

Publication Type:
Journal Article
Citation:
Chemistry - An Asian Journal, 2013, 8 (12), pp. 3142 - 3146
Issue Date:
2013-12-01
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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 core-shell 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 mAh g -1 and superior rate capability. In particular, Ge@C nanocomposite electrodes maintained a reversible capacity of 734 mAh g-1 after repeated cycling at a current density of 800 mA g-1 over 100 cycles. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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