材料科学
杂原子
掺杂剂
拉曼光谱
电化学
纳米棒
化学工程
碳纤维
氧化还原
成核
兴奋剂
纳米技术
物理化学
电极
化学
复合数
复合材料
有机化学
戒指(化学)
物理
光电子学
工程类
光学
冶金
作者
Shunyou Hu,Xueyan Huang,Ling Zhang,Guanglei Li,Shengmin Chen,Jiaheng Zhang,Shunyou Hu
标识
DOI:10.1002/adfm.202214161
摘要
Abstract Lithium–sulfur (Li–S) batteries are hindered by the shuttle effect and the sluggish redox kinetics of polysulfides. In this study, topological insulators (TIs) Bi 2 Te 3−x with abundant Te vacancies embedded in N and B co‐doped carbon nanorods (Bi 2 Te 3−x @NBCNs) are synthesized and used as sulfur host composites for high‐performance Li–S batteries. Bi 2 Te 3−x @NBCNs effectively enhance the intrinsic conductivity, strengthened the chemical affinity, and accelerated the redox kinetics of polysulfides. 1D carbon nanorods with N and B co‐doped heteroatoms endowed with abundant polar sites improve the chemical affinity of polysulfides, while the embedded Bi 2 Te 3−x nanoparticles further promote the nucleation and electrodeposition of Li 2 S 2 /Li 2 S. In situ Raman spectroscopy confirms that Bi 2 Te 3−x @NBCNs effectively reduced cathode‐side accumulation of polysulfides and suppressed the shuttle effect. Owing to the extraordinary synergistic effects of rich heteroatom polar sites and conductive topological surface states, Bi 2 Te 3−x @NBCN‐based cells exhibit a high initial specific capacity of 1264 mAh g −1 at 0.2 C and ultra‐long lifetime (>1000 cycles, with a degradation rate of 0.02% per cycle at 1.0 C). The fundamental insights offered by this work are likely to enable improvement of the electrochemical performance of Li–S batteries based on TI materials.
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