Hollow porous SiO2 nanobelts containing sulfur for long-life lithium-sulfur batteries
Hollow porous SiO2 nanobelts containing sulfur for long-life lithium-sulfur batteries
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用于长寿命锂硫电池的含硫中空多孔SiO2纳米带
DOI：
10.1039/c6ra19573c
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Zhou Yiming
中科院分区：
文献类型：
--
作者：
Xue Manli;Zhou Yunyun;Geng Jiarun;Zeng Pan;Xu Yan;Wang Yuguo;Tang Wangzhong;Wu Ping;Wei Shaohua;Zhou Yiming
硫是一种极具吸引力的阴极材料，理论比容量高达1672 mA h g−1。然而，由于锂硫电池中多硫中间体的高溶解度及其与锂阳极的副反应，其在充放电循环中的快速容量衰减仍然阻碍了其实际应用。本文采用简单的模板定向法制备了一种新型中空多孔SiO2纳米带。空心多孔SiO2纳米带不仅可以作为硫的支架，还可以作为lsb的多硫储集层。由于其独特的结构和组成特征，与原始硫阴极相比，空心多孔SiO2纳米带/S复合阴极具有显著增强的循环稳定性和优越的库仑效率。含硫50 wt%的SiO2纳米带/S复合材料在0.1C下循环70次后，初始放电容量为685 mA h g - 1和534 mA h g - 1，平均库仑效率约为100%。这些结果表明，SiO2纳米带/S复合材料有望成为高效、长寿命的lbs。
Sulfur is a type of a fascinating cathode material with a high theoretical specific capacity of 1672 mA h g−1. However, its rapid capacity fading on charge/discharge cycling still hinders its practical implementation owing to the high solubility of polysulfide intermediates and their side-reactions with the Li anode for lithium–sulfur batteries (LSBs). In this study, a new type of hollow porous SiO2 nanobelt was fabricated by a simple template-directed methodology. The hollow porous SiO2 nanobelts not only serve as scaffolds to house sulfur but also as a polysulfide reservoir for LSBs. Due to their unique structural and compositional features, the hollow porous SiO2 nanobelts/S composite cathodes exhibit substantially enhanced cycling stability and superior coulombic efficiency compared to the pristine sulfur cathode. The SiO2 nanobelts/S composite with 50 wt% sulfur delivers an initial discharge capacity of 685 mA h g−1 and 534 mA h g−1 after 70 cycles at 0.1C with an average coulombic efficiency of about 100%. These results suggest that the SiO2 nanobelts/S composites hold great promise for high-efficiency and long-term service life LSBs.