期刊
JOURNAL OF POWER SOURCES
卷 211, 期 -, 页码 46-51出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.03.084
关键词
Lithium-ion battery; Nanowire electrode; Ni-Sn alloy; Nanowire network; Areal capacity
资金
- University of Colorado
- Defense Advanced Research Projects Agency (DARPA) N/MEMS S&T Fundamentals program through the DARPA Center on Nanoscale Science and Technology for Integrated Micro/Nano-Electromechanical Transducers (iMINT) [N66001-10-1-4007]
- NNIN
- National Science Foundation [ECS-0335765]
- Chinese Academy of Sciences via the Hundred Talent program
- NSFC [11021262]
Nanowire arrays present an excellent candidate for high performance lithium-ion battery electrodes. However, agglomeration in long nanowire arrays impedes nanowire-based electrodes from delivering high areal capacity, by degrading the nanoscale wires to micro-sized bundles and reducing the mechanical stability. In this study, we develop a simple way to fabricate three-dimensional (3D) nickel-tin (Ni-Sn) nanowire networks by using 3D porous anodic alumina templates synthesized from low-cost impure aluminum foils. By eliminating agglomeration, stable high areal capacity anodes are demonstrated with 3D self-supporting Ni-Sn nanowire network structures. With a nanowire length of 40 mu m, the 3D Ni-Sn nanowire networks can deliver an areal capacity as high as 4.3 mAh cm(-2) with a cycle life longer than 50 cycles. The 3D Ni-Sn nanowire networks also exhibit an excellent rate capability with 72% of the capacity retained when the test rate increases from C/5 to 6C. (C) 2012 Elsevier B.V. All rights reserved.
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