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Graphene Scroll‐Coated α‐MnO2 Nanowires as High‐Performance Cathode Materials for Aqueous Zn‐Ion Battery
Small ( IF 13.0 ) Pub Date : 2018-02-02 , DOI: 10.1002/smll.201703850 Buke Wu 1 , Guobin Zhang 1 , Mengyu Yan 1, 2 , Tengfei Xiong 1 , Pan He 1 , Liang He 1, 3 , Xu Xu 1 , Liqiang Mai 1
Small ( IF 13.0 ) Pub Date : 2018-02-02 , DOI: 10.1002/smll.201703850 Buke Wu 1 , Guobin Zhang 1 , Mengyu Yan 1, 2 , Tengfei Xiong 1 , Pan He 1 , Liang He 1, 3 , Xu Xu 1 , Liqiang Mai 1
Affiliation
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The development of manganese dioxide as the cathode for aqueous Zn‐ion battery (ZIB) is limited by the rapid capacity fading and material dissolution. Here, a highly reversible aqueous ZIB using graphene scroll‐coated α‐MnO2 as the cathode is proposed. The graphene scroll is uniformly coated on the MnO2 nanowire with an average width of 5 nm, which increases the electrical conductivity of the MnO2 nanowire and relieves the dissolution of the cathode material during cycling. An energy density of 406.6 Wh kg−1 (382.2 mA h g−1) at 0.3 A g−1 can be reached, which is the highest specific energy value among all the cathode materials for aqueous Zn‐ion battery so far, and good long‐term cycling stability with 94% capacity retention after 3000 cycles at 3 A g−1 are achieved. Meanwhile, a two‐step intercalation mechanism that Zn ions first insert into the layers and then the tunnels of MnO2 framework is proved by in situ X‐ray diffraction, galvanostatic intermittent titration technique, and X‐ray photoelectron spectroscopy characterizations. The graphene scroll‐coated metallic oxide strategy can also bring intensive interests for other energy storage systems.
中文翻译：
石墨烯涡旋涂层α-MnO2纳米线作为水性锌离子电池的高性能阴极材料
二氧化锰作为水性Zn离子电池（ZIB）正极的发展受到容量快速衰减和材料溶解的限制。在这里，用涂布的石墨烯滚动α-MnO的一个高度可逆的含水ZIB 2作为阴极提出。石墨烯涡卷均匀地涂覆在具有5nm的平均宽度的MnO 2纳米线上，这增加了MnO 2纳米线的电导率并减轻了循环过程中阴极材料的溶解。在0.3 A g -1时的能量密度为406.6 Wh kg -1（382.2 mA hg -1）可以达到，这是迄今为止所有水性Zn离子电池正极材料中最高的比能量值，并且在3 A g -1下经过3000次循环后，具有良好的长期循环稳定性和94％的容量保持率。同时，通过原位X射线衍射，恒电流间歇滴定技术和X射线光电子能谱表征证明了Zn离子首先插入层中，然后MnO 2骨架的隧道的两步插入机理。石墨烯涡旋涂层金属氧化物策略还可以为其他储能系统带来浓厚的兴趣。
更新日期：2018-02-02
中文翻译：
石墨烯涡旋涂层α-MnO2纳米线作为水性锌离子电池的高性能阴极材料
二氧化锰作为水性Zn离子电池（ZIB）正极的发展受到容量快速衰减和材料溶解的限制。在这里，用涂布的石墨烯滚动α-MnO的一个高度可逆的含水ZIB 2作为阴极提出。石墨烯涡卷均匀地涂覆在具有5nm的平均宽度的MnO 2纳米线上，这增加了MnO 2纳米线的电导率并减轻了循环过程中阴极材料的溶解。在0.3 A g -1时的能量密度为406.6 Wh kg -1（382.2 mA hg -1）可以达到，这是迄今为止所有水性Zn离子电池正极材料中最高的比能量值，并且在3 A g -1下经过3000次循环后，具有良好的长期循环稳定性和94％的容量保持率。同时，通过原位X射线衍射，恒电流间歇滴定技术和X射线光电子能谱表征证明了Zn离子首先插入层中，然后MnO 2骨架的隧道的两步插入机理。石墨烯涡旋涂层金属氧化物策略还可以为其他储能系统带来浓厚的兴趣。
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