Direct electrodeposition of ionic liquid-based template-free SnCo alloy nanowires as an anode for Li-ion batteries |
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Authors: | Le-ping Wang Gang Chen Qi-xin Shen Guo-min Li Shi-you Guan Bing Li |
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Institution: | 1.School of Materials science and Engineering,East China University of Science and Technology,Shanghai,China;2.Institute for Sustainable Energy,Shanghai University,Shanghai,China |
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Abstract: | SnCo alloy nanowires were successfully electrodeposited from SnCl2?CoCl2?1-ethyl-3-methylimidazolium chloride (EMIC) ionic liquid without a template. The nanowires were obtained from the molar ratio of 5:40:60 for SnCl2:CoCl2:EMIC at ?0.55 V and showed a minimum diameter of about 50 nm and lengths of over 20 μm. The as-fabricated SnCo nanowires were about 70 nm in diameter and featured a Sn/Co weight ratio of 3.85:1, when used as an anode for a Li-ion battery, they presented respective specific capacities of 687 and 678 mAh·g?1 after the first charge and discharge cycle and maintained capacities of about 654 mAh·g?1 after 60 cycles and 539 mAh·g?1 after 80 cycles at a current density of 300 mA·g?1. Both the nanowire structure and presence of elemental Co helped buffer large volume changes in the Sn anode during charging and discharging to a certain extent, thereby improving the cycling performance of the Sn anode. |
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