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Facile Synthesis of Ge@C Core–Shell Nanocomposites for High‐Performance Lithium Storage in Lithium‐Ion Batteries
Author(s) -
Wang Ying,
Wang Guoxiu
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201300858
Subject(s) - nanocomposite , materials science , anode , lithium (medication) , transmission electron microscopy , nanotechnology , chemical engineering , carbon fibers , ion , nanocrystal , scanning electron microscope , electrode , lithium ion battery , composite material , battery (electricity) , composite number , chemistry , organic chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
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.