材料科学
超级电容器
纳米棒
碱性电池
阳极
阴极
电池(电)
电解质
氧化物
纳米技术
电容
储能
化学工程
功率密度
碳纳米管
电化学
电极
电气工程
功率(物理)
冶金
化学
物理化学
工程类
物理
量子力学
作者
Ruizhi Li,Yimeng Wang,Cheng Zhou,Chong Wang,Xin Ba,Yuanyuan Li,Xintang Huang,Jinping Liu
标识
DOI:10.1002/adfm.201502265
摘要
Iron oxides are promising to be utilized in rechargeable alkaline battery with high capacity upon complete redox reaction (Fe 3+ Fe 0 ). However, their practical application has been hampered by the poor structural stability during cycling, presenting a challenge that is particularly huge when binder‐free electrode is employed. This paper proposes a “carbon shell‐protection” solution and reports on a ferroferric oxide–carbon (Fe 3 O 4 –C) binder‐free nanorod array anode exhibiting much improved cyclic stability (from only hundreds of times to >5000 times), excellent rate performance, and a high capacity of ≈7776.36 C cm −3 (≈0.4278 C cm −2 ; 247.5 mAh g −1 , 71.4% of the theoretical value) in alkaline electrolyte. Furthermore, by pairing with a capacitive carbon nanotubes (CNTs) film cathode, a unique flexible solid‐state rechargeable alkaline battery‐supercapacitor hybrid device (≈360 μm thickness) is assembled. It delivers high energy and power densities (1.56 mWh cm −3 ; 0.48 W cm −3 /≈4.8 s charging), surpassing many recently reported flexible supercapacitors. The highest energy density value even approaches that of Li thin‐film batteries and is about several times that of the commercial 5.5 V/100 mF supercapacitor. In particular, the hybrid device still maintains good electrochemical attributes in cases of substantially bending, high mechanical pressure, and elevated temperature (up to 80 °C), demonstrating high environmental suitability.
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