石墨烯
钨
催化作用
硫黄
电化学
材料科学
化学工程
分离器(采油)
吸附
锂(药物)
纳米技术
电极
化学
物理化学
有机化学
冶金
医学
物理
内分泌学
工程类
热力学
作者
Peng Wang,Baojuan Xi,Zhengchunyu Zhang,Menglin Huang,Jinkui Feng,Shenglin Xiong
标识
DOI:10.1002/ange.202104053
摘要
Abstract Use of catalytic materials is regarded as the most desirable strategy to cope with sluggish kinetics of lithium polysulfides (LiPSs) transformation and severe shuttle effect in lithium–sulfur batteries (LSBs). Single‐atom catalysts (SACs) with 100 % atom‐utilization are advantagous in serving as anchoring and electrocatalytic centers for LiPSs. Herein, a novel kind of tungsten (W) SAC immobilized on nitrogen‐doped graphene (W/NG) with a unique W‐O 2 N 2 ‐C coordination configuration and a high W loading of 8.6 wt % is proposed by a self‐template and self‐reduction strategy. The local coordination environment of W atom endows the W/NG with elevated LiPSs adsorption ability and catalytic activity. LSBs equipped with W/NG modified separator manifest greatly improved electrochemical performances with high cycling stability over 1000 cycles and ultrahigh rate capability. It indicates high areal capacity of 6.24 mAh cm −2 with robust cycling life at a high sulfur mass loading of 8.3 mg cm −2 .
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