Electrochemical properties of spherically shaped dense V 2O 5 cathode powders prepared directly by spray pyrolysis

You Na Ko, Jung Hyun Kim, Seung Ho Choi, Yun Chan Kang

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21 Citations (Scopus)

Abstract

Spherically shaped vanadium pentoxide (V 2O 5) cathode powders with porous or dense morphologies are prepared directly via spray pyrolysis by varying the preparation temperatures between 600 and 1000 °C. The powders prepared at 600 °C consist of nanometer-sized rod-shaped crystals with porous structures. The V 2O 5 powders prepared at 1000 °C have spherical shapes, clean surfaces, and dense structures, because of complete melting of the powders that occurs inside the hot-wall reactor. The Brunauer-Emmett-Teller (BET) surface areas of the V 2O 5 powders decrease from 24.7 to 3.2 m 2 g -1 when the preparation temperature increases from 600 to 1000 °C. The V 2O 5 powders prepared at 1000 °C have better cycle properties than those prepared at 600 and 800 °C. The discharge capacity of the V 2O 5 powders prepared at 1000 °C decreases from 432 mAh g -1 to 263 mAh g -1 after 20 cycles, in which the capacity retention is 61%.

Original languageEnglish
Pages (from-to)84-91
Number of pages8
JournalJournal of Power Sources
Volume211
DOIs
Publication statusPublished - 2012 Aug 1

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Keywords

  • Cathode material
  • Lithium battery
  • Spray pyrolysis
  • Vanadium pentoxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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