期刊
NANOSCALE
卷 4, 期 17, 页码 5343-5347出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr31045g
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资金
- 973 Project [2007CB613403]
- Innovation Team Project of Zhejiang Province [2009R50005]
- NSFC [50802086, 51002133]
In this paper, we have reported a novel hierarchical nanostructure made of vertically ordered Ni3Si2/Si nanorod arrays to moderate the notorious pulverization and capacity decay usually occurring in the silicon used as the anode materials in Li-ion batteries. During the lithiation and delithiation process, the amorphous Si (a-Si) layer acts as an active material and participates in the processes, whereas the Ni3Si2 nanorod arrays work as a mechanically stable supporter and fast charge transport pathway. In addition, they can afford sufficient interspace for expansion/contraction upon lithium insertion/extraction. These Ni3Si2/Si nanorod arrays anodes exhibit excellent cycling performance at high current rates of 1 C (4.2 A g(-1)), 2 C (8.4 A g(-1)), and 4 C (16.8 A g(-1)), respectively. A high and steady discharge capacity of over 2184 mA h g(-1) can be achieved after 50 cycles with a high initial coulombic efficiency of 86.7%. The synthesis approach is simple, efficient and rich-yielding, probably providing a new strategy for the application of silicon-based anode materials with enhanced performance.
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