Facile Synthesis of Ge@C Core–Shell Nanocomposites for High‐Performance Lithium Storage in Lithium‐Ion Batteries |
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Authors: | Dr Ying Wang Prof Guoxiu Wang |
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Institution: | Centre for Clean Energy Technology and School of Chemistry and Forensic Science, University of Technology, Sydney, City Campus, Broadway, Sydney NSW 2007 (Australia) |
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Abstract: | 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. |
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Keywords: | composite materials core– shell structures germanium lithium‐ion batteries nanostructures |
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