期刊
JOURNAL OF POWER SOURCES
卷 196, 期 16, 页码 6657-6662出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.12.075
关键词
Silicon nanowires; Electrochemical performance; Lithium-ion batteries; Copper-coated
资金
- National Natural Science Foundation of China [90606015]
- National Basic Research Program of China (973 program) [2007CB209702]
Silicon nanowires (Si NWs) with copper-coating as high capacity and improved cycle-life anode for lithium-ion batteries have been successfully prepared by chemical vapor deposition and magnetron sputtering methods. The morphology, structure, composition as well as the electrochemical performance of copper-coated Si NWs is characterized in detail. The results indicate that the copper-coated Si NWs electrodes show an initial coulombic efficiency of 90.3% when cycling between 0.02V and 2.0 V (versus Li/Li(+)) at a current density of 210 mA g(-1). The copper-coated Si NWs electrodes exhibit a capacity as high as 2700 mAh g(-1) at the first cycle. They also show a good capacity retention and excellent rate capability compared with pristine and carbon-coated Si NWs. (C) 2011 Elsevier B.V. All rights reserved.
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