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首页> 外文期刊>Advanced energy materials >Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping
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Promoting Highly Reversible Sodium Storage of Iron Sulfide Hollow Polyhedrons via Cobalt Incorporation and Graphene Wrapping

机译：通过钴结合和石墨烯包裹促进硫化铁空心多面体的高度可逆钠存储

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摘要

Sodium ion batteries (SIBs) have drawn significant attention owing to their low cost and inherent safety. However, the absence of suitable anode materials with high rate capability and long cycling stability is the major challenge for the practical application of SIBs. Herein, an efficient anode material consisting of uniform hollow iron sulfide polyhedrons with cobalt doping and graphene wrapping (named as CoFeS@rGO) is developed for high-rate and long-life SIBs. The graphene-encapsulated hollow composite assures fast and continuous electron transportation, high Na+ ion accessibility, and strong structural integrity, showing an extremely small volume expansion of only 14.9% upon sodiation and negligible volume contraction during the desodiation. The CoFeS@rGO electrode exhibits high specific capacity (661.9 mAh g(-1) at 100 mA g(-1)), excellent rate capability (449.4 mAh g(-1) at 5000 mA g(-1)), and long cycle life (84.8% capacity retention after 1500 cycles at 1000 mA g(-1)). In situ X-ray diffraction and selected-area electron diffraction patterns show that this novel CoFeS@rGO electrode is based on a reversible conversion reaction. More importantly, when coupled with a Na3V2(PO4)(3)/C cathode, the sodium ion full battery delivers a superexcellent rate capability (496.8 mAh g(-1) at 2000 mA g(-1)) and approximate to 96.5% capacity retention over 200 cycles at 500 mA g(-1) in the 1.0-3.5 V window. This work indicates that the rationally designed anode material is highly applicable for the next generation SIBs with high-rate capability and long-term cyclability.
机译：钠离子电池（SIB）由于其低成本和固有的安全性而备受关注。然而，缺少合适的具有高倍率能力和长循环稳定性的阳极材料是SIB实际应用的主要挑战。本文中，开发了一种高效的阳极材料，该材料由均匀的空心硫化铁多面体和钴掺杂和石墨烯包裹层组成（称为CoFeS @ rGO），用于高速率和长寿命的SIB。石墨烯包裹的中空复合材料可确保快速连续的电子传输，高的Na +离子可及性和强大的结构完整性，在成泥时显示极小的体积膨胀（仅14.9％），而在脱硫过程中显示出可忽略的体积收缩。 CoFeS @ rGO电极具有高比容量（在100 mA g（-1）时为661.9 mAh g（-1）），出色的倍率容量（在5000 mA g（-1）时为449.4 mAh g（-1））和长的循环寿命（在1000 mA g（-1）下1500次循环后的容量保持率为84.8％）。原位X射线衍射和选定区域电子衍射图谱表明，这种新型CoFeS @ rGO电极基于可逆转化反应。更重要的是，当与Na3V2（PO4）（3）/ C阴极结合使用时，钠离子充满电池可提供极佳的速率容量（在2000 mA g（-1）时为496.8 mAh g（-1）），约占96.5％在1.0-3.5 V窗口中以500 mA g（-1）在200个循环中保持最大容量。这项工作表明，合理设计的负极材料非常适合具有高倍率能力和长期循环能力的下一代SIB。

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