Journal
ENERGY & FUELS
Volume 35, Issue 4, Pages 3490-3496Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.0c04383
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Funding
- Natural Science Foundation of Jiangsu Province of China [BK20180086]
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In this study, a Fe7S8@medium thickness carbon coating material was successfully fabricated using a solvothermal method, showing superior electrochemical performance with high specific capacity, high current property, and stable cyclic life.
Fe7S8, a potential anode material, has been extensively investigated but still faces challenges because of its poor cycling performance resulted from a large volume expansion. In this work, a solvothermal approach was employed to synthesize quasicubic alpha-Fe2O3 nanoparticles followed by sequential phenol-formaldehyde resin and mesoporous SiO2 coating. After sulfurization and the subsequent removal of the SiO2 shell, a Fe7S8@medium thickness carbon coating has been successfully fabricated, which exhibits a large specific capacity, remarkable high-current property, and stable cyclic performance for potassium-ion batteries (PIBs). It delivers a 423.3 mAh g(-1) superior initial reversible capacity at 0.2 A g(-1), excellent rate performance of 212.6 mAh g(-1) at 2 A g(-1), and long cyclic life of 266.9 mAh g(-1) at 1 A g(-1) after 500 cycles. These remarkable potassium storage properties are related to the excellent stress self-cushioning effect due to the spherical nanoarchitecture and complete carbon covering.
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