多硫化物
材料科学
惰性
兴奋剂
氮化物
锂硫电池
锂(药物)
硫黄
锡
图层(电子)
催化作用
纳米材料
无机化学
化学工程
纳米技术
电极
电化学
化学
光电子学
有机化学
电解质
冶金
物理化学
内分泌学
工程类
医学
作者
Boyu Hao,Huan Li,Wei Lv,Yunbo Zhang,Shuzhang Niu,Qi Qi,Shujie Xiao,Jia Li,Feiyu Kang,Quan‐Hong Yang
出处
期刊:Nano Energy
[Elsevier]
日期:2019-06-01
卷期号:60: 305-311
被引量:108
标识
DOI:10.1016/j.nanoen.2019.03.064
摘要
Lithium-sulfur batteries show great promise among future battery technologies, but their cycle life is mainly restricted by the shuttling effect of soluble lithium polysulfides (LiPSs). The catalytic conversion of LiPSs appears to be a fundamental way of suppressing this. The highly conductive metal nitrides show great potentials as high-performance catalysts, but the presence of a thin surface oxidation layer, which is normal for nanomaterials, restrains the surface electron transfer and catalytic activity. In this study, we demonstrate that the doping of the oxidation layer is an ideal solution to reviving and enhancing the catalytic activity of nitrides. As a proof of concept, sulfur-doping of a titanium nitride (TiN) oxidation layer is presented here, and the TiS bonds formed are responsible for transmitting electrons from the conductive TiN matrix thus guaranteeing a high catalytic activity. Interfacing of TiS with TiO bonds at the atomic level helps realize strong trapping and fast conversion of LiPSs simultaneously. As a result, the specific capacity, rate performance, and cyclic stability are all greatly improved by the interlayer composed of sulfur-doped TiN and graphenes, which indicates a practical avenue for building high performance lithium-sulfur batteries.
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