Journal
ENERGY STORAGE MATERIALS
Volume 28, Issue -, Pages 91-100Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.03.002
Keywords
Bowl-like VS2; Array; Nanosheet; Anode; Flexible sodium-ion capacitor
Funding
- Natural Science Foundation of China [51702295, 51772116]
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Sodium-ion hybrid capacitors (SIHCs) show great promise due to their combination of high energy-storage properties and low cost of Na resources. Yet most anodes in SIHCs suffer from sluggish Na+-diffusion kinetics and relatively low specific capacity, which restrict their widespread development. Herein, bowl-like VS2 nanosheet arrays are uniformly and robustly anchored on a carbon nanofiber (CNF) substrate through a one-step solvothermal method. The bowl-like VS2 is featured with an ultrathin thickness (several atomic layers), intrinsically metallic conductivity and an interconnected array architecture. This unique structural design can not only facilitate ultrafast Na+ ion-diffusion, but also suppress capacity decay of VS2 that is caused by the conversion process below 0.3 V. DFT calculations demonstrate a faster Na+ transport rate and a lower diffusion energy barrier for the VS2/C interface than for the VS2/VS2 bilayer. The quasi-solid-state SIHC full cell that integrates the CNF@VS2 anode and the graphene sheets-wrapped carbon nanofiber (CNF@GS) cathode, displays prominent energy//power densities in the voltage range of 0.0-4.0 V (116 Wh kg(-1) at 0.4 kW kg(-1); 66 Wh kg(-1) at 40 kW kg(-1) based on the total mass of both electrodes), outperforming recent SIHCs.
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