期刊
CHEMICAL ENGINEERING JOURNAL
卷 416, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129166
关键词
Lithium-sulfur battery; Iron selenide; Chemical affinity; Polysulfide redox conversion
资金
- National Postdoctoral Program for Innovative Talents [BX201700103]
- China Postdoctoral Science Foundation [2018 M633664]
- Youth Innovation Promotion Association of CAS [2019298]
- National Natural Science Foundation of China [51702362]
A new sulfur host FeSe2@C NBs is proposed in this study, which can effectively suppress polysulfide shuttle effect, accelerate sulfur redox conversion, and show better performance in lithium-sulfur batteries.
The notorious issues of polysulfide shuttling behaviour and sluggish redox kinetics seriously hamper the practical applications of lithium-sulfur (Li-S) batteries. In this work, catalytic FeSe2 nanoparticles encapsulated with carbon nanoboxes (FeSe2@C NBs) that derived from the selenide reaction of yolk-shelled Fe3O4@C are proposed as a multifunctional sulfur host to restrain the polysulfide shuttle effect and accelerate the polysulfide redox conversion. The experimental results display that the S/FeSe2@C cathode exhibits better sulfur utilization, higher rate performance, and longer cycle life compared to S/Fe3O4@C cathode. Even after 700 cycles at 1C, an ultralow capacity decay of 0.04% per cycle of S/FeSe2@C cathode can still be maintained. The density functional theory (DFT) calculations reveal that FeSe2@C NBs possess stronger chemical affinity to polysulfides and lower energy gap between bonding and antibonding orbitals, which could promote the interfacial charge transfer kinetics, thus enabling better Li-S battery performance.
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