Carbon-Stabilized High-Capacity Ferroferric Oxide Nanorod Array for Flexible Solid-State Alkaline Battery-Supercapacitor Hybrid Device with High Environmental Suitability
Carbon-Stabilized High-Capacity Ferroferric Oxide Nanorod Array for Flexible Solid-State Alkaline Battery-Supercapacitor Hybrid Device with High Environmental Suitability
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DOI：
10.1002/adfm.201502265
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发表时间：
2015-09-02
影响因子：
19
通讯作者：
Liu, Jinping
中科院分区：
文献类型：
--
作者：
Li, Ruizhi;Wang, Yimeng;Liu, Jinping
铁氧化物在完全氧化还原反应（Fe 3 + Fe-0）的情况下具有高容量的可再充电碱性电池中的应用前景。然而，它们的实际应用受到循环期间差的结构稳定性的阻碍，当采用无粘合剂电极时，这提出了特别巨大的挑战。本文提出了一种碳壳保护解决方案，并报道了一种无粘结剂的四氧化三铁-碳（Fe 3 O 4-C）纳米棒阵列阳极，该阳极表现出大大改善的循环稳定性（从仅几百次到>5000次）、优异的倍率性能、以及接近7776.36C cm（-3）的高容量（约0.4278 C cm（-2）; 247.5 mAh g（-1），理论值的71.4%）。此外，通过与电容性碳纳米管（CNT）薄膜阴极配对，组装了独特的柔性固态可充电碱性电池-超级电容器混合装置（厚度约为360 μ m）。它提供高能量和功率密度（1.56 mWh cm（-3）; 0.48 W cm（-3）/约4.8 s充电），超过了许多最近报道的柔性超级电容器。其最高能量密度值甚至接近锂薄膜电池，约为商用5.5 V/100 mF超级电容器的数倍。特别地，混合装置在基本弯曲、高机械压力和升高的温度（高达80摄氏度）的情况下仍然保持良好的电化学属性，证明了高的环境适应性。
Iron oxides are promising to be utilized in rechargeable alkaline battery with high capacity upon complete redox reaction (Fe3+ 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 (Fe3O4-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 approximate to 7776.36 C cm(-3) (approximate to 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 (approximate to 360 m thickness) is assembled. It delivers high energy and power densities (1.56 mWh cm(-3); 0.48 W cm(-3)/approximate to 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 degrees C), demonstrating high environmental suitability.