Details

Autor(en) / Beteiligte

• He, Yanan
• Xu, Yifan
• Li, Jianbo
• Xu, Zhenhua
• Zhang, Zhuangzhuang
• Sun, Jianlu
• Zhang, Min
• Zhu, Xiaoshu
• Zhou, Xiaosi

Titel

Core–Shell Structured Fe7S8@C Nanospheres as a High-Performance Anode Material for Potassium-Ion Batteries

Ist Teil von

• Energy & fuels, 2021-02, Vol.35 (4), p.3490-3496

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 α-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.