Journal
NEW JOURNAL OF CHEMISTRY
Volume 41, Issue 24, Pages 15210-15215Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj03573j
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Funding
- National Natural Science Foundation of China [51572058, 51502057]
- International Science & Technology Cooperation Program of China [2013DFR10630, 2015DFE52770]
- Specialized Research Fund for the Doctoral Program of Higher Education [SRFDP 20132302110031]
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Germanium has emerged as a promising Li ion battery anode material due to its high theoretical capacity. The in situ growth of Ge nanowires on current collectors (binder-free electrodes) has attracted much attention owing to their good electrical contact, excellent strain accommodation ability, promising material durability and short Li ion diffusion distance. Herein, we report a facile and efficient technique to synthesize Ge nanowire cluster arrays (Ge NWCAs) on nickel foam through an ultraviolet light (UV) assisted, template-free electrodeposition process from 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim]Tf2N). As a binder-free anode material, a Ge NWCA electrode exhibits a specific capacity of 1612 mA h g(-1) and retains 740 mA h g(-1) up to 200 cycles at a current rate of 0.2C. The Ge NWCA electrode affords excellent rate capacity at 0.1C-2C and retains specific capacity as high as 959 mA h g(-1) at 2C. Furthermore, the specific capacity well recovers to 998 mA h g(-1) when the rate is reduced from 2C to 0.1C. UV assisted ionic liquid electrodeposition might open up a new avenue for the synthesis of semiconductor nanostructures.
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