期刊
JOURNAL OF POWER SOURCES
卷 484, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229308
关键词
SiO2/C composite nanofibers; Interlayer; Li polysulfide shuttle control; Lithium-sulfur battery; Energy storage materials
资金
- Tokyo Institute of Technology
The free-standing SiO2/C composite nanofiber mat acts as a multifunctional interlayer on the cathode side of lithium-sulfur batteries, effectively suppressing the polysulfide shuttle effect and improving specific capacity and long-cycling stability. The adsorption/conversion mechanisms of the polysulfides by the interlayer are elucidated through various tests and analyses.
A free-standing SiO2/C composite nanofiber mat (FS-SiO2/C-CNFM), prepared by electrospinning with heat treatments, is used as a multifunctional interlayer on the cathode side to suppress the polysulfide shuttle effect in lithium-sulfur batteries. The polysulfide adsorption and conversion capabilities of the interlayer are evaluated by a static polysulfide adsorption test and an electrochemical conversion test in an FS-SiO2/C-CNEM symmetric cell. The effects of the FS-SiO2/C-CNEM on the electrochemical properties of the lithium-sulfur batteries are studied by cyclic voltammetry, galvanostatic charge-discharge cycle tests, and electrochemical impedance spectroscopy. The FS-SiO2/C-CNEM interlayer significantly improves the specific capacity, long-cycling stability, and self-discharge behavior of the lithium-sulfur batteries. The cell with the FS-SiO2/C-CNEM interlayer has an initial discharge capacity of 1304 mA h g(-1) and retains 934 mA h g(-1) over 50 cycles at 0.1 C, corresponding to a capacity retention of 72% with 100% Coulombic efficiency. The improved properties are attributed to the suppression of the shuttle effect and the high reutilization of the trapped polysulfides. The adsorption/conversion mechanisms of the polysulfides of the FS-SiO2/C-CNEM interlayer are further elucidated from the results of ex situ X-ray photoelectron spectroscopy (XPS) and field-emission scanning electron microscopy (FE-SEM) with energy-dispersive X-ray spectroscopy (EDS) analysis.
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