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State Key Lab of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
; Tel: 86-571-87953190
Nanoscale, 2012,4, 5343-5347
30 Apr 2012,
18 Jun 2012
First published online
21 Jun 2012
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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