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首页> 外文期刊>Advanced Functional Materials >In Situ Construction of 'Anchor-Like' Structures in FeNCN for Long Cyclic Life in Sodium-Ion Batteries
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In Situ Construction of 'Anchor-Like' Structures in FeNCN for Long Cyclic Life in Sodium-Ion Batteries

机译：FeNCN中的“锚样”结构的原位构建可延长钠离子电池的循环寿命

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摘要

Iron carbodiimide (FeNCN) is a high-reactivity anode material for sodium-ion batteries. However, strict synthesis technology and poor electrochemical stability limit its application. FeNCN polyhedrons are prepared using a facile one-step pyrolysis process. In these polyhedrons, many "anchor-like" structures are in situ constructed with Fe-C bonds. These Fe-C bonds connect the FeNCN polyhedrons closely. The FeNCN polyhedrons with "anchor-like" structures exhibit good electrochemical stability, that is, high capacity retention of 79.9% (408 mAh g(-1)) at 0.5 A g(-1) after 300 cycles. Further analysis suggests that the Fe-C bond plays an important role to improve the structural stability of FeNCN polyhedrons. The "anchor-like" structures with Fe-C bonds can hold FeNCN polyhedrons closely when Na+ intercalates, avoiding structural breakage with obvious capacity loss. This work provides a novel synthesis technology of FeNCN and helps related researcher to deepen the understanding of this material, as well as provide inspirations as to improving the electrochemical stability of related materials.
机译：碳二亚胺铁（FeNCN）是用于钠离子电池的高反应活性阳极材料。但是，严格的合成技术和较差的电化学稳定性限制了其应用。 FeNCN多面体使用简便的一步热解法制备。在这些多面体中，许多“锚样”结构是通过Fe-C键原位构建的。这些Fe-C键紧密连接FeNCN多面体。具有“锚样”结构的FeNCN多面体表现出良好的电化学稳定性，即300次循环后，在0.5 A g（-1）下的高容量保持率为79.9％（408 mAh g（-1））。进一步的分析表明，Fe-C键在改善FeNCN多面体的结构稳定性方面起着重要作用。当Na +插入时，具有Fe-C键的“锚状”结构可以紧密地保持FeNCN多面体，从而避免结构破坏并造成明显的容量损失。这项工作提供了一种新的FeNCN合成技术，并有助于相关研究人员加深对这种材料的理解，并为提高相关材料的电化学稳定性提供启发。

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  • 来源
    《Advanced Functional Materials》 |2020年第17期|2000208.1-2000208.10|共10页
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  • 作者单位

    Shaanxi Univ Sci & Technol Sch Mat Sci & Engn Shaanxi Key Lab Green Preparat & Functionalizat I Xian 710021 Shaanxi Peoples R China;

    Shaanxi Univ Sci & Technol Sch Mat Sci & Engn Shaanxi Key Lab Green Preparat & Functionalizat I Xian 710021 Shaanxi Peoples R China|Dingxin Cells Co Ltd Nantong 226600 Jiangsu Peoples R China;

    Kochi Univ Res Lab Hydrothermal Chem Kochi 7808520 Japan;

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  • 正文语种 eng
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  • 关键词

    composite structures; iron carbodiimides; pyrolytic synthesis; sodium-ion batteries;

    机译：复合结构碳二亚胺铁;热解合成钠离子电池;

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