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

Research output: Contribution to journalArticle

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
Externally publishedYes

Fingerprint

Spray pyrolysis
Electrochemical properties
Powders
pyrolysis
sprayers
Cathodes
cathodes
preparation
cycles
Vanadium
vanadium
Melting
rods
reactors
melting
Temperature
Crystals
temperature
crystals

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

Cite this

Electrochemical properties of spherically shaped dense V 2O 5 cathode powders prepared directly by spray pyrolysis. / Ko, You Na; Kim, Jung Hyun; Choi, Seung Ho; Kang, Yun Chan.

In: Journal of Power Sources, Vol. 211, 01.08.2012, p. 84-91.

Research output: Contribution to journalArticle

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