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Scalable In Situ Reactive Assembly of Polypyrrole‐Coated MnO2 Nanowire and Carbon Nanotube Composite as Freestanding Cathodes for High Performance Aqueous Zn‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-05-16 , DOI: 10.1002/celc.202000253 Yong Zhang 1 , Guobao Xu 2 , Xiong Liu 1 , Xiaolin Wei 1 , Juexian Cao 3 , Liwen Yang 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-05-16 , DOI: 10.1002/celc.202000253 Yong Zhang 1 , Guobao Xu 2 , Xiong Liu 1 , Xiaolin Wei 1 , Juexian Cao 3 , Liwen Yang 1
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Flexible aqueous zinc‐ion batteries are attracting increasing interest owing to high theoretical capacity, low cost and high safety, however, it is highly challenging to design and fabricate suitable cathodes with superior Zn2+ storage as well as high flexibility. Herein, a free‐standing flexible film composed of carbon nanotubes and polypyrrole (PPy)‐coated MnO2 nanowires is prepared via a facile in situ reactive self‐assembly and following vacuum filtration. The unique hierarchically porous 3D architecture of uniformly dispersed MnO2 nanowires with PPy coating in highly electrically conductive and interconnected CNTs networks not only improve the reaction kinetics and structural stability of the electrodes during repeated cycling, but also provides abundant sites for Zn2+ and H+ adsorption, giving rise to additional pseudocapacitive charge storage. When the free‐standing flexible film is used as a freestanding cathode for an aqueous zinc ion battery, the electrode shows a good storage capacity of H+ and Zn2+ ions and a superior durability with a good capacity retention rate of 87.4 % after 1000 times at 1 A/g. And the energy density of the flexible device is about 341.6 Wh/kg (based on the mass of MnO2).The results provide a feasible strategy of constructing high‐performance cathodes for flexible aqueous zinc‐ion batteries.
中文翻译：
聚吡咯包覆的MnO2纳米线和碳纳米管复合材料的可扩展原位反应性组装，作为高性能水性锌离子电池的独立阴极
柔性的水性锌离子电池由于具有较高的理论容量，低成本和高安全性而受到越来越多的关注，但是，设计和制造具有出色的Zn 2+存储以及高柔韧性的合适的阴极面临着巨大的挑战。在此，通过方便的原位反应自组装并随后进行真空过滤，制备了由碳纳米管和聚吡咯（PPy）包覆的MnO 2纳米线组成的自支撑柔性膜。均匀分散的MnO 2独特的分层多孔3D结构具有高度导电性和互连性的CNTs网络中具有PPy涂层的纳米线，不仅可以改善重复循环过程中电极的反应动力学和结构稳定性，而且还提供了大量的Zn 2+和H +吸附位点，从而增加了伪电容存储。当独立式柔性膜用作水性锌离子电池的独立式阴极时，该电极显示出良好的H +和Zn 2+离子存储容量以及优异的耐久性，1000次后的容量保持率高达87.4％时间为1 A / g。柔性设备的能量密度约为341.6 Wh / kg（基于MnO 2的质量）。结果为构建柔性水性锌离子电池高性能阴极提供了可行的策略。
更新日期：2020-06-30
中文翻译：
聚吡咯包覆的MnO2纳米线和碳纳米管复合材料的可扩展原位反应性组装，作为高性能水性锌离子电池的独立阴极
柔性的水性锌离子电池由于具有较高的理论容量，低成本和高安全性而受到越来越多的关注，但是，设计和制造具有出色的Zn 2+存储以及高柔韧性的合适的阴极面临着巨大的挑战。在此，通过方便的原位反应自组装并随后进行真空过滤，制备了由碳纳米管和聚吡咯（PPy）包覆的MnO 2纳米线组成的自支撑柔性膜。均匀分散的MnO 2独特的分层多孔3D结构具有高度导电性和互连性的CNTs网络中具有PPy涂层的纳米线，不仅可以改善重复循环过程中电极的反应动力学和结构稳定性，而且还提供了大量的Zn 2+和H +吸附位点，从而增加了伪电容存储。当独立式柔性膜用作水性锌离子电池的独立式阴极时，该电极显示出良好的H +和Zn 2+离子存储容量以及优异的耐久性，1000次后的容量保持率高达87.4％时间为1 A / g。柔性设备的能量密度约为341.6 Wh / kg（基于MnO 2的质量）。结果为构建柔性水性锌离子电池高性能阴极提供了可行的策略。
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