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Synthesis and electrochemical properties of V2O5nanostructures prepared via a precipitation process for lithium-ion battery cathodes

Identifieur interne : 009324 ( Main/Exploration ); précédent : 009323; suivant : 009325

Synthesis and electrochemical properties of V2O5nanostructures prepared via a precipitation process for lithium-ion battery cathodes

Auteurs : S. H. Ng [Australie] ; S. Y. Chew [Australie] ; J. Wang [Australie] ; D. Wexler [Australie] ; Y. Tournayre [Australie] ; K. Konstantinov [Australie] ; H. K. Liu [Australie]

Source :

RBID : Pascal:08-0329556

Descripteurs français

English descriptors

Abstract

One-dimensional (1D) nanostructures of vanadium pentoxide (V2O5) have been successfully synthesized via a precipitation process followed by heating in vacuum at 300 °C. The samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical testing by techniques such as cyclic voltammetry (CV) and discharge-charge cycling in lithium cells. Average crystal size of these oxides increased from 36 to 83 nm as annealing time was increased from 45 min to 1 h, which also led to a decrease in Brunauer-Emmett-Teller (BET) specific surface area from 41 to 17m2 g-1. Good cyclability and high capacity (>200 mAh g-1) were achieved in the voltage range of 2.0-4.0V (versus Li metal) at a current rate of 50 mA g-1 by annealing the oxides for 1 h. The increase in crystallinity and higher yield of one-dimensional nanostructure oxides contributed significantly to the improved capacity and enhanced cycle life.


Affiliations:


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<term>Electrochemical properties</term>
<term>Lithium battery</term>
<term>Nanostructure</term>
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<term>Service life</term>
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<term>Propriété électrochimique</term>
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<term>Diffractométrie RX</term>
<term>Microscopie électronique balayage</term>
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<div type="abstract" xml:lang="en">One-dimensional (1D) nanostructures of vanadium pentoxide (V
<sub>2</sub>
O
<sub>5</sub>
) have been successfully synthesized via a precipitation process followed by heating in vacuum at 300 °C. The samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical testing by techniques such as cyclic voltammetry (CV) and discharge-charge cycling in lithium cells. Average crystal size of these oxides increased from 36 to 83 nm as annealing time was increased from 45 min to 1 h, which also led to a decrease in Brunauer-Emmett-Teller (BET) specific surface area from 41 to 17m
<sup>2</sup>
g
<sup>-1</sup>
. Good cyclability and high capacity (>200 mAh g
<sup>-1</sup>
) were achieved in the voltage range of 2.0-4.0V (versus Li metal) at a current rate of 50 mA g
<sup>-1</sup>
by annealing the oxides for 1 h. The increase in crystallinity and higher yield of one-dimensional nanostructure oxides contributed significantly to the improved capacity and enhanced cycle life.</div>
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