Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 886, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115102
Keywords
FeS; C; Ionic liquid; Carbon layer; SIBs
Categories
Funding
- National Natural Science Foundation of China [52064035]
- Natural Science Foundation of Gansu Province [20JR10RA166]
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FeS/C, synthesized by a simple pyrolysis strategy, shows high capacity, long cycle life, and stability in sodium-ion batteries, attributed to the wrinkled carbon layers enhancing structural stability and charge mobility.
FeS is a promising anode material with high theoretical capacity in sodium-ion batteries (SIBs). Unfortunately, the unstable structure and poor conductivity of FeS limit its commercial applications. Herein, FeS coated by wrinkled thin layers of carbon (FeS/C) is synthesized by using a simple pyrolysis strategy. The wrinkled carbon layers, which derived from ionic liquids, effectively improve the conductivity and structural stability of FeS. When employed as anode in SIBs, FeS/C exhibits high capacity, long cycle life, and excellent stability. Specifically, when the current density is 0.1 A g?1 and 0.5 A g?1, the reversible capacity of FeS/C reaches 404.7 mAh g?1 and 304.8 mAh g?1 after 100 cycles. When the current density increases to 4 A g?1, the sodium storage can maintain a capacity of 178.8 mAh g?1 after 1000 cycles. The excellent electrochemical performance can be attributed to the wrinkled carbon layers that enhance the structural stability and charge mobility.
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