A new strategy for synthesizing yolk-shell V2O5 powders with low melting temperature for high performance Li-ion batteries

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This paper presents the fabrication of yolk-shell V2O5 powders with a low melting temperature of 690 degrees C by using a simplified two-step process. The spherical V2O3-C composite obtained by spray pyrolysis transforms into yolk-shell V2O5 powder by a simple combustion process at 400 degrees C. The yolk-shell V2O5 powders are composed of nanoplate crystals several tens of nanometers in size, and have a BET surface area of 15 m(2) g(-1). The powders exhibit initial discharge and charge capacities of 271 and 264 mA h g(-1) at a current density of 1000 mA g(-1), respectively, and a corresponding Coulombic efficiency of 97.4%. After 100 cycles, the discharge capacity of the yolk-shell V2O5 powders is 201 mA h g(-1). In contrast, spherical V2O5 powders with a dense structure exhibit low initial discharge and charge capacities of 160 and 145 mA h g(-1), respectively. The structural stability of the yolk-shell during Li-ion insertion and extraction improves the electrochemical properties of the V2O5 powders, even at high current densities.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2013
Language
English
Article Type
Article
Keywords

TEMPLATE-FREE SYNTHESIS; HOLLOW CARBON SPHERES; CATHODE MATERIALS; HIGH-CAPACITY; LITHIUM-STORAGE; VANADIUM-OXIDE; ANODE MATERIAL; MICROSPHERES; NANOSTRUCTURES; FILMS

Citation

NANOSCALE, v.5, no.19, pp.8899 - 8903

ISSN
2040-3364
DOI
10.1039/c3nr02625f
URI
http://hdl.handle.net/10203/255299
Appears in Collection
CBE-Journal Papers(저널논문)
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