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Superior Lithium Storage Properties of β-FeOOH

机译：β-FeOOH的优异锂存储性能

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摘要

Several crystal forms of FeOOH are recently reported to be highly promising for lithium storage due to their high capacity, low cost, and environmental friendliness. In particular, β-FeOOH has shown a capacity of ≈1000 mAh g−1, which is comparable to other promising iron-based anodes, such as Fe2O3 and Fe3O4. However, its storage mechanisms are unclear and the potential for further improvement remains unexplored. Here, it is shown that this material can have a very high reversible capacity of ≈1400 mAh g−1, which is 20%–40% higher than Fe2O3 and Fe3O4. Such a high capacity is delivered from a series of reactions including intercalation and conversion reactions, formation/deformation of solid-state electrolyte interface layers and interfacial storage. The mechanisms are studied by a combination of electrochemical and X-ray absorption near edge spectroscopic approaches. Moreover, very long cycling performance, that is, after even more than 3000 cycles the material still has a significant capacity of more than 800 mAh g−1, is obtained by a simple electrode design involving introducing a rigid support into porous electrodes. Such long cycling performance is for the first time achieved for high-capacity materials based on conversion reactions.
机译：据报道，FeOOH的几种晶体形式因其高容量，低成本和环境友好性而在锂存储中具有很高的前景。特别是，β-FeOOH的容量约为≈1000mAh g-1，可与其他有前途的铁基阳极（如Fe2O3和Fe3O4）媲美。但是，其存储机制尚不清楚，进一步改进的潜力仍待探索。在这里，表明该材料可以具有约1400 mAh g-1的非常高的可逆容量，比Fe2O3和Fe3O4高20％–40％。如此高的容量是通过一系列反应实现的，这些反应包括插入和转化反应，固态电解质界面层的形成/变形以及界面存储。通过结合近边缘光谱方法的电化学和X射线吸收来研究机理。此外，通过简单的电极设计即可获得非常长的循环性能，也就是说，即使经过超过3000次循环，该材料仍然具有超过800 mAh g-1的显着容量，这涉及将刚性支撑物引入多孔电极中。如此长的循环性能是首次基于转化反应的高容量材料实现的。

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  • 来源
    《Advanced energy materials》 |2015年第6期|1-8|共8页
  • 作者

    Linghui Yu; Shibo Xi; Chao Wei; Wenyu Zhang; Yonghua Du; Qingyu Yan; Zhichuan Xu;

  • 作者单位

    School of Materials Science and Engineering Nanyang Technological University Singapore;

    Institute of Chemical and Engineering Sciences A*STAR Singapore;

    School of Materials Science and Engineering Nanyang Technological University Singapore;

    School of Materials Science and Engineering Nanyang Technological University Singapore;

    Institute of Chemical and Engineering Sciences A*STAR Singapore;

    School of Materials Science and Engineering Nanyang Technological University Singapore;

    School of Materials Science and Engineering Nanyang Technological University Singapore;

    Energy Research Institute@NTU Nanyang Technological University Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    lithium-ion batteries; porous electrodes; anodes; β-FeOOH; XANES;

    机译：锂离子电池;多孔电极;阳极;β-FeOOH;XANES;

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