多硫化物
硫黄
阴极
材料科学
X射线光电子能谱
电池(电)
储能
超级电容器
锂(药物)
电导率
导电体
化学工程
电解质
电化学
锂硫电池
纳米技术
电极
化学
复合材料
冶金
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Xiao Liang,Arnd Garsuch,Linda F. Nazar
标识
DOI:10.1002/anie.201410174
摘要
Abstract Lithium–sulfur batteries are amongst the most promising candidates to satisfy emerging energy‐storage demands. Suppression of the polysulfide shuttle while maintaining high sulfur content is the main challenge that faces their practical development. Here, we report that 2D early‐transition‐metal carbide conductive MXene phases—reported to be impressive supercapacitor materials—also perform as excellent sulfur battery hosts owing to their inherently high underlying metallic conductivity and self‐functionalized surfaces. We show that 70 wt % S/Ti 2 C composites exhibit stable long‐term cycling performance because of strong interaction of the polysulfide species with the surface Ti atoms, demonstrated by X‐ray photoelectron spectroscopy studies. The cathodes show excellent cycling performance with specific capacity close to 1200 mA h g −1 at a five‐hour charge/discharge (C/5) current rate. Capacity retention of 80 % is achieved over 400 cycles at a two‐hour charge/discharge (C/2) current rate.
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