Hierarchical vanadium pentoxide spheres as high-performance anode materials for sodium-ion batteries

Authors

Dawei Su, University of Technology Sydney, University of WollongongFollow
S X. Dou, University of WollongongFollow
Guoxiu Wang, University of Technology SydneyFollow

RIS ID

102916

Publication Details

Su, D., Dou, S. & Wang, G. (2015). Hierarchical vanadium pentoxide spheres as high-performance anode materials for sodium-ion batteries. ChemSusChem: chemistry and sustainability, energy and materials, 8 (17), 2877-2882.

Abstract

We report the synthesis of hierarchical vanadium pentoxide (V₂O₅) spheres as anode materials for sodium-ion batteries (Na-ion batteries). Through field emission scanning electron microscopy, X-ray diffraction, and transmission electron microscopy characterizations, it was found that the as-prepared V₂O₅ spheres are composed of primary nanoparticles with pores between them. The as-prepared hierarchical V₂O₅ spheres achieved a discharge capacity of 271 mA h g^-1 at a current density of 40 mA g^-1, and 177 mA h g^-1 discharge capacity after 100 cycles. Even at high current densities, V₂O₅ spheres still delivered high capacity and superior cyclability (179 and 140 mA h g^-1 discharge capacities at 640 and 1280 mA g^-1 current densities, respectively). The promising electrochemical performances of V₂O₅ spheres should be ascribed to the unique architecture of hierarchical spheres and the predominant exposed (110) facets, which provides open interlayers for facile sodium ion intercalation. Each nanoparticle contains predominantly exposed (110) crystal planes. The ex situ FESEM analysis revealed that the pores formed by the primary nanocrystals effectively buffer volume changes in the electrode during cycling, contributing to the excellent cycling performance.