Solid State Ionics, Vol.287, 36-41, 2016
Core-shell structured Na3V2(PO4)(3)/C nanocrystals embedded in multi-walled carbon nanotubes: A high-performance cathode for sodium-ion batteries
In this work, we study the synthesis and electrochemical performance of Na3V2(PO4)(3)/C and multi-walled carbon nanotubes (MWCNTs) hybrid nanocomposite for use as cathode material in high performance sodium-ion batteries. This nanostructured hybrid material is prepared through a hydrothermal-assisted sol-gel process followed by thermal annealing. The obtained sample has been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectrum. The crosslinked MWCNTs can provide good electronic conductive pathways interconnecting Na3V2(PO4)(3)/C particles. Electrode fabricated from this hybrid material delivers a high reversible capacity and superior rate performance upto an extremely high rate of 10 C. Moreover, ultralong cycling stability is also attained through 500 cycles at 10 C with 93.9% capacity retention. These results demonstrate that the addition of MWCNTs is an effective way to improve the electrochemical performance of Na3V2(PO4)(3)/C cathode material for sodium-ion batteries. (C) 2015 Published by Elsevier B.V.