Jump to main content
Jump to site search


Yolk–shell Nb2O5 microspheres as intercalation pseudocapacitive anode materials for high-energy Li-ion capacitors

Author affiliations

Abstract

Lithium-ion capacitors (LICs) are receiving extensive attention due to their high energy/power densities. However, the imbalance in reaction kinetics between the sluggish diffusion-limited insertion anode and rapid surface-controlled capacitive cathode always leads to limited power density and poor cycling properties. Herein, yolk–shell structured orthorhombic phase Nb2O5 microspheres (YS-Nb2O5) are prepared via a scalable spray drying method employing niobium oxalate hydrate as the precursor. The as-prepared YS-Nb2O5 exhibits high specific capacity (211 mA h g−1 at 0.5C) and superior rate capability. LICs based on the YS-Nb2O5 anode and activated carbon (AC) cathode are also assembled. The YS-Nb2O5//AC LIC devices exhibit ultrahigh energy (173 W h kg−1) and power (10.8 kW kg−1) densities with ideal cycling stability (∼98% capacity retention for 1000 cycles). This work provides significant insight into the reasonable design of pseudocapacitive anode materials for high-performance LICs.

Graphical abstract: Yolk–shell Nb2O5 microspheres as intercalation pseudocapacitive anode materials for high-energy Li-ion capacitors

Back to tab navigation

Supplementary files

Publication details

The article was received on 03 Mar 2019, accepted on 07 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02342A
Citation: J. Mater. Chem. A, 2019, Advance Article

  •   Request permissions

    Yolk–shell Nb2O5 microspheres as intercalation pseudocapacitive anode materials for high-energy Li-ion capacitors

    S. Fu, Q. Yu, Z. Liu, P. Hu, Q. Chen, S. Feng, L. Mai and L. Zhou, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA02342A

Search articles by author

Spotlight

Advertisements