Free-standing ternary metallic sulphides/Ni/C-nanofiber anodes for high-performance lithium-ion capacitors

• 来源期刊: 能源化学
• 年，卷（期）: 2020,（3）
• 页码范围: 108-115
• 页数: 8页
• 语种: 英文

摘要

As a promising energy-storage device,the hybrid lithium-ion capacitor coupling with both a large energy density battery-type anode and a high power density capacitor-type cathode is attracting great attention.For the sake of improving the energy density of hybrid lithium-ion capacitor,the free-standing anodes with good electrochemical performance are essential.Herein,we design an effective electrospinning strategy to prepare free-standing MnS/Co4S3/Ni3S2/Ni/C-nanofibers (TMSs/Ni/C-NFs) film and firstly use it as a binder-free anode for hybrid lithium-ion capacitor.We find that the carbon nanofibers can availably prevent MnS/Co4S3/Ni3S2/Ni nanoparticles from aggregation as well as significantly improve the electrochemical performance.Therefore,the binder-free TMSs/Ni/C-NFs membrane displays an ultrahigh reversible capacity of 1246.9 rnAh g-1 at 100mA g-1,excellent rate capability (398 mAh g-1 at 2000 mA g-1),and long-term cyclic endurance.Besides,we further assemble the hybrid lithium-ion ca pacitor,which exhibits a high energy density of 182.0Wh kg-1 at 121.1 W kg-1 (19.0Wh kg-1 at 3512.5W kg-1) and remarkable cycle life.