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首页> 外文期刊>RSC Advances >One step production of in situ nitrogen doped mesoporous carbon confined sulfur for lithium-sulfur batteries
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One step production of in situ nitrogen doped mesoporous carbon confined sulfur for lithium-sulfur batteries

机译：一步生产用于锂硫电池的原位氮掺杂介孔碳约束硫

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摘要

Nitrogen doped mesoporous carbon (NMC) with high specific surface area, large pore volume and stable nitrogen content has been prepared by in situ doping through one step carbonization to immobilize sulfur for lithium-sulfur batteries. The structure and composition of the prepared NMC and NMC@S composites are confirmed with nitrogen sorption, elemental analysis, X-ray photoelectron spectroscopy (XPS), X-ray diffraction patterns (XRD), high resolution transmission electron microscopy (HR-TEM) and thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) images show a homogeneous distribution of sulfur within NMC@S. In comparison with free doped mesoporous carbon (MC), the NMC@S with high sulfur content (65%) is found to exhibit a higher initial discharge capacity of 1012 mA h g(-1) and higher capacity retention. The electrochemical performance of Li-S batteries is improved by the nitrogen doping, which not only enhances the electric conductivity but also further confines polysufides to the mesoporous carbon from shuttle effect.
机译：氮掺杂的介孔碳（NMC）具有较高的比表面积，大的孔容和稳定的氮含量，这是通过一步一步碳化原位掺杂来固定锂硫电池中硫的方法制备的。通过氮气吸附，元素分析，X射线光电子能谱（XPS），X射线衍射图谱（XRD），高分辨率透射电子显微镜（HR-TEM）确认了制备的NMC和NMC @ S复合材料的结构和组成和热重分析（TGA）。扫描电子显微镜（SEM）图像显示NMC @ S中硫的均匀分布。与自由掺杂的中孔碳（MC）相比，具有高硫含量（65％）的NMC @ S具有更高的1012 mA h g（-1）的初始放电容量和更高的容量保持率。氮掺杂改善了Li-S电池的电化学性能，这不仅增强了电导率，而且还通过穿梭效应将多硫化物限制在中孔碳中。

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