A Flexible Alkaline Rechargeable Ni/Fe Battery Based on Graphene Foam/Carbon Nanotubes Hybrid Film

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• 作者：Jilei Liu ; Minghua Chen ; Lili Zhang ; Jian Jiang ; Jiaxu Yan ; Yizhong Huang ; Jianyi Lin ; Hong Jin Fan ; Ze Xiang Shen
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：December 10, 2014
• 年：2014
• 卷：14
• 期：12
• 页码：7180-7187
• 全文大小：539K
• ISSN：1530-6992

文摘

The development of portable and wearable electronics has promoted increasing demand for high-performance power sources with high energy/power density, low cost, lightweight, as well as ultrathin and flexible features. Here, a new type of flexible Ni/Fe cell is designed and fabricated by employing Ni(OH)₂ nanosheets and porous Fe₂O₃ nanorods grown on lightweight graphene foam (GF)/carbon nanotubes (CNTs) hybrid films as electrodes. The assembled f-Ni/Fe cells are able to deliver high energy/power densities (100.7 Wh/kg at 287 W/kg and 70.9 Wh/kg at 1.4 kW/kg, based on the total mass of active materials) and outstanding cycling stabilities (retention 89.1% after 1000 charge/discharge cycles). Benefiting from the use of ultralight and thin GF/CNTs hybrid films as current collectors, our f-Ni/Fe cell can exhibit a volumetric energy density of 16.6 Wh/l (based on the total volume of full cell), which is comparable to that of thin film battery and better than that of typical commercial supercapacitors. Moreover, the f-Ni/Fe cells can retain the electrochemical performance with repeated bendings. These features endow our f-Ni/Fe cells a highly promising candidate for next generation flexible energy storage systems.

Keywords:

Ni/Fe cell; flexible battery; graphene foam; carbon nanotubes; hybrid electrodes