多硫化物
硫黄
材料科学
电化学
化学工程
阴极
碳纤维
储能
氧化还原
电极
无机化学
纳米技术
化学
复合数
复合材料
冶金
功率(物理)
量子力学
物理化学
工程类
物理
电解质
作者
Shuaibo Zeng,A. Gowri Manohari,Xianhu Liu,Yuzhao Yang,Xin Li,Hai Zhong,Fei Guo,Zhen Wang
出处
期刊:Small
[Wiley]
日期:2020-08-28
卷期号:16 (39)
被引量:50
标识
DOI:10.1002/smll.202001027
摘要
Lithium-sulfur (Li-S) batteries with a high energy density and long lifespan are considered as promising candidates for next-generation electrochemical energy-storage devices. However, the sluggish redox kinetics of electrochemistry and high solubility of polysulfide during cycling render insufficient sulfur utilization and poor cycling stability. Herein, a facile, template-free procedure based on controlled pyrolysis of polydopamine vesicles is described to prepare N-doped porous carbon cages (NHSC) as a new sulfur host, which significantly improves both the sulfur utilization and cycling stability. As NHSC shows a high pore volume, continuous electron and ion transport paths, and good catalytic activity, encapsulation of S nanoparticles into NHSC endows the resulting S@NHSC electrode with a good energy storage capacity and exceptionally high electrochemical stability. Consequently, a Li-S cell with the S@NHSC as the cathode achieves a high initial capacity of 1280.7 mAh g-1 , and cycling stability over 500 cycles with the capacity decay as low as 0.0373% per cycle.
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