法拉第效率
材料科学
碳纤维
介孔材料
阴极
硫黄
化学工程
多孔性
电化学
吸附
纳米技术
复合数
解吸
电极
化学
复合材料
催化作用
有机化学
冶金
物理化学
工程类
作者
Tingjiao Xiao,Yumei Yang,Mingzhi Yang,Weiliang Liu,Mei Li,Manman Ren,Feipeng Cai,Yuanhao Wang
标识
DOI:10.1016/j.jallcom.2022.166334
摘要
The “shuttle effect”, tardy reaction kinetics and volume change of sulfur cathode limit the wide application of Li-S batteries (LSBs). In this work, a composite of flower-like CoOOH decorating hierarchical porous carbon (CoOOH-HPC) was successfully synthesized and utilized as a sulfur host for LSBs. SEM and TEM images exhibited that the flower-like CoOOH formed by nanosheets was uniformly dispersed on the hierarchical porous carbon which was constructed by carbon spheres and nanotubes. Nitrogen adsorption/desorption isotherm and pore size distribution revealed that the ultrahigh specific surface area and suitable uniform mesopores of the CoOOH-HPC. Benefitting from the perfect combination of CoOOH and HPC, the CoOOH-HPC/S electrode delivered satisfactory electrochemical performance. It remained a discharge capacity of 550.9 mA h g−1 after 270 cycles at 0.5 C, with a low capacity decay rate of 0.017 % per cycle and a stable coulombic efficiency (over 96 %). Besides, the CoOOH-HPC/S electrode with a high sulfur loading of 2.8 mg cm−2 can demonstrate a discharge capacity of 357.91 mA h g−1 after 500 cycles, with the capacity decay rate of 0.08 % per cycle. This work provided a new method for preparing a variety of metal-based compound decorative hierarchical porous carbon composites, which can be used in LSBs and other energy storage and conversion devices.
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