Journal
ACS NANO
Volume 8, Issue 7, Pages 7051-7059Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn501945f
Keywords
Li-Ion batteries; anodes; Ge; nanowires; carbon encapsulating
Categories
Funding
- Alexander von Humboldt Foundation
- National Natural Science Foundation of China [21171015 and 21373195]
- Recruitment Program of Global Experts, program for New Century Excellent Talents in University (NCET)
- Fundamental Research Funds for the Central Universities [WK2060140014, WK2060140016]
- Max Planck Society
- Chinese Academy Science
- European Union Seventh Framework Programme [312483]
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Germanium-based materials (Ge and GeOx) have recently demonstrated excellent lithium-ion storage ability and are being considered as the most promising candidates to substitute commercial carbon-based anodes of lithium-ion batteries. Nevertheless, practical implementation of Ge-based materials to lithiumion batteries is greatly hampered by the poor cyclability that resulted from the huge volume variation during lithiation/delithiation processes. Herein, uniform carbon-encapsulated Ge and GeOx nanowires were synthesized by a one-step controlled pyrolysis of organic-inorganic hybrid GeOx/ethylenediamine (GeOx/EDA) nanowires in H-2/Ar and Ar atmospheres, respectively. The as-obtained Ge/C and GeOx/C nanowires possess well-defined 0D-in-1D morphology and homogeneous carbon encapsulation, which exhibit excellent Li storage properties including high specific capacities (approximate 1200 and 1000 mA h g(-1) at 0.2C for Ge/C and GeOx/C, respectively). The Ge/C nanowires, in particular, demonstrate superior rate capability with excellent capacity retention and stability (producing high stable discharge capacities of about 770 mA h g(-1) after 500 cycles at 10C), making them promising candidates for future electrodes for high-power U-ion batteries. The improved electrochemical performance arises from synergistic effects of 0D-in-1D morphology and uniform carbon coating, which could effectively accommodate the huge volume change of Ge/GeOx during cycling and maintain perfect electrical conductivity throughout the electrode.
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