Stable high areal capacity lithium-ion battery anodes based on three-dimensional Ni-Sn nanowire networks

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• 作者：Miao Tian^a ; ^{mmtian@colorado.edu} ; Wei Wang^a ; Yujie Wei^b ; Ronggui Yang^a ; ^{ronggui.yang@colorado.edu}
• 关键词：Lithium-ion battery ; Nanowire electrode ; Ni&ndash ; Sn alloy ; Nanowire network ; Areal capacity
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：1 August, 2012
• 卷：211
• 期：Complete
• 页码：46-51
• 文件大小：1348 K

摘要

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 渭m, the 3D Ni-Sn nanowire networks can deliver an areal capacity as high as 4.3 mAh cm^鈭? 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.