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首页> 外文期刊>Nano letters >Two Birds with One Stone: FeS2@C Yolk-Shell Composite for High-Performance Sodium-Ion Energy Storage and Electromagnetic Wave Absorption
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Two Birds with One Stone: FeS2@C Yolk-Shell Composite for High-Performance Sodium-Ion Energy Storage and Electromagnetic Wave Absorption

机译：两只鸟一块石头：FES2 @ C蛋白壳壳复合材料，用于高性能钠离子储能和电磁波吸收

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摘要

Cost-effective material with a rational design is significant for both sodium-ion batteries (SIBS) and electromagnetic wave (EMW) absorption. Herein, we report an elaborate yolk-shell FeS2@C nanocomposite as a promising material for application in both SIBs and EMW absorption. When applied as an anode material in SIBs, the yolk-shell structure not only facilitates a fast electron transport and shortens Na ion diffusion paths but also eases the huge volume change of FeS2 during repeated discharge/charge processes. The as-developed FeS2@C exhibits a high specific capacity of 616 mA h g(-1) after 100 cycles at 0.1 A g(-1) with excellent rate performance. Furthermore, owing to the significant cavity and interfacial effects enabled by yolk-shell structuring, the FeS2@C nanocomposite delivers excellent EMW absorption properties with a strong reflection loss (-45 dB with 1.45 mm matching thickness) and a broad 15.4 GHz bandwidth. This work inspires the development of high-performance bifunctional materials.
机译：具有合理设计的经济高效材料对于钠离子电池（SIB）和电磁波（EMW）吸收具有重要意义。在此，我们将详细的蛋黄 - 壳FES2 @ C纳米复合物作为有希望的材料，用于在SIB和EMW吸收中应用。当以SIBS施加作为阳极材料时，蛋黄壳结构不仅便于快速电子传输，并且缩短了Na离子扩散路径，而且还可以减轻在重复的放电/充电过程中FES2的巨大变化。在0.1Ag（-1）的100个循环以优异的速率性能下，AS开发的FES2 @ C在100次循环后表现出616mA H（-1）的高比容量。此外，由于蛋白质壳结构使能实现的显着腔和界面效应，FES2 @ C纳米复合材料具有优异的EMW吸收性能，具有强烈的反射损耗（匹配厚度为1.45mm，厚度为1.45dB）和宽15.4GHz带宽。这项工作激发了高性能双功能材料的发展。

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