Electrochemical properties of ZrO2-doped V2O 5 amorphous powders with spherical shape and fine size

You Na Ko, Seung Ho Choi, Yun Chan Kang, Seung Bin Park

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Amorphous V2O5 powders with zirconia (ZrO 2) dopant are prepared by one-pot spray pyrolysis at temperatures above the melting temperature of V2O5. The powders with 7 wt % ZrO2 are completely spherical and dense with a clean surface, on which crystals of pure V2O5 powders are scarcely observed. The V2O5 powders with 7 wt % ZrO2 have uniformly distributed V and Zr components. The uniformly distributed Zr component disturbs the crystallization of V2O5 during the quenching of the melted powders. These powders also give smooth initial discharge curves with a single slope, which is typical to amorphous materials. The discharge capacities of the V2O5 powders with 7 wt % ZrO2 are 309, 269, and 222 mA h g-1 after the first, second, and 50th cycles, respectively, even at a high current density of 294 mA g-1. The capacity retention measured after the first cycle is 83% after 50 cycles.

Original languageEnglish
Pages (from-to)3234-3240
Number of pages7
JournalACS Applied Materials and Interfaces
Volume5
Issue number8
DOIs
Publication statusPublished - 2013 Apr 24
Externally publishedYes

Fingerprint

Electrochemical properties
Powders
Spray pyrolysis
Crystallization
Zirconia
Melting point
vanadium pentoxide
Quenching
Current density
Doping (additives)
Crystals

Keywords

  • amorphous material
  • cathode material
  • composite powders
  • Li-ion battery
  • spray pyrolysis
  • vanadium oxide

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Electrochemical properties of ZrO2-doped V2O 5 amorphous powders with spherical shape and fine size. / Ko, You Na; Choi, Seung Ho; Kang, Yun Chan; Park, Seung Bin.

In: ACS Applied Materials and Interfaces, Vol. 5, No. 8, 24.04.2013, p. 3234-3240.

Research output: Contribution to journalArticle

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N2 - Amorphous V2O5 powders with zirconia (ZrO 2) dopant are prepared by one-pot spray pyrolysis at temperatures above the melting temperature of V2O5. The powders with 7 wt % ZrO2 are completely spherical and dense with a clean surface, on which crystals of pure V2O5 powders are scarcely observed. The V2O5 powders with 7 wt % ZrO2 have uniformly distributed V and Zr components. The uniformly distributed Zr component disturbs the crystallization of V2O5 during the quenching of the melted powders. These powders also give smooth initial discharge curves with a single slope, which is typical to amorphous materials. The discharge capacities of the V2O5 powders with 7 wt % ZrO2 are 309, 269, and 222 mA h g-1 after the first, second, and 50th cycles, respectively, even at a high current density of 294 mA g-1. The capacity retention measured after the first cycle is 83% after 50 cycles.

AB - Amorphous V2O5 powders with zirconia (ZrO 2) dopant are prepared by one-pot spray pyrolysis at temperatures above the melting temperature of V2O5. The powders with 7 wt % ZrO2 are completely spherical and dense with a clean surface, on which crystals of pure V2O5 powders are scarcely observed. The V2O5 powders with 7 wt % ZrO2 have uniformly distributed V and Zr components. The uniformly distributed Zr component disturbs the crystallization of V2O5 during the quenching of the melted powders. These powders also give smooth initial discharge curves with a single slope, which is typical to amorphous materials. The discharge capacities of the V2O5 powders with 7 wt % ZrO2 are 309, 269, and 222 mA h g-1 after the first, second, and 50th cycles, respectively, even at a high current density of 294 mA g-1. The capacity retention measured after the first cycle is 83% after 50 cycles.

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