SnS/C nanocomposites for high-performance sodium ion battery anodes.
SnS/C nanocomposites for high-performance sodium ion battery anodes.
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用于高性能钠离子电池阳极的SNS/C纳米复合材料。
DOI：
10.1039/c8ra04421j
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发表时间：
2018-06-27
期刊：
影响因子：
3.9
通讯作者：
Abruna, Hector D.
中科院分区：
文献类型：
--
作者：
Yu, Seung-Ho;Jin, Aihua;Huang, Xin;Yang, Yao;Huang, Rong;Brock, Joel D.;Sung, Yung-Eun;Abruna, Hector D.
钠离子电池被认为是继锂离子电池之后，在大规模储能应用中最有前途的电池类型之一。然而，它们的应用取决于新负极材料的开发，因为已有研究表明，用于锂离子电池的许多重要负极材料，如石墨和硅，对钠离子电池来说是不够的。我们通过自顶向下的方法简单地制备了新型的SnS/C纳米复合材料作为钠离子电池的负极材料。与裸SNS相比，它们的电化学性能有了显著的提高，特别是在循环稳定性和倍率能力方面。SnS/C纳米复合材料在不同的电流速率下表现出良好的容量保持能力，即使在800 mA g−1(2C)的高电流密度下也能提供高达400 mA h g−1的容量。对SnS/C纳米复合材料的反应机理进行了非原位电子显微镜、X-射线衍射谱和X-射线吸收近边结构的研究。简单地制备了SnS/C纳米复合材料作为钠离子电池负极材料。它们在不同的电流密度下表现出良好的循环稳定性，当电流从50 mA g−1增加到500 mA g时，容量可达90%以上。
Sodium-ion batteries have been considered as one of the most promising types of batteries, beyond lithium-ion batteries, for large-scale energy storage applications. However, their deployment hinges on the development of new anode materials, since it has been shown that many important anode materials employed in lithium ion batteries, such as graphite and silicon, are inadequate for sodium-ion batteries. We have simply prepared novel SnS/C nanocomposites through a top-down approach as anode materials for sodium-ion batteries. Their electrochemical performance has been significantly improved when compared to bare SnS, especially in terms of cycling stability and rate capabilities. SnS/C nanocomposites exhibit excellent capacity retention, at various current rates, and deliver capacities as high as 400 mA h g−1 even at the high current density of 800 mA g−1 (2C). Ex situ transmission electron microscopy, X-ray diffraction and operando X-ray absorption near edge structure studies have been performed in order to unravel the reaction mechanism of the SnS/C nanocomposites. SnS/C nanocomposites were simply prepared as anode materials for sodium-ion batteries. They showed excellent cycling stability at various current densities with more than 90% of its capacity delivered when the current increased from 50 to 500 mA g−1.
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