Superior electrochemical properties of rutile VO2-carbon composite microspheres as a promising anode material for lithium ion batteries

Jong Min Won, You Na Ko, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We report a new process to prepare VO2(R)-carbon composite microspheres, which can be used as an anode material in lithium ion batteries. Crystalline V2O3-carbon composite microspheres prepared by a one-pot spray pyrolysis process are transformed into VO2(R)-carbon composite microspheres by heat treatment at 300°C under air atmosphere. Polyvinylpyrrolidone (PVP), which is used as the carbon source, affects the morphologies, crystal structures, and electrochemical properties of the vanadium oxide materials. The carbon content of the VO2(R)-carbon composite powders is about 12.5 wt%. The bare vanadium oxide powders prepared from the spray solution without PVP show rod-like or spherical morphologies. The initial discharge and charge capacities of the VO2(R)-carbon composite powders are 1091 and 659 mA h g-1, respectively. The discharge capacity of the VO2(R)-carbon composite powders after 100 cycles is 637 mA h g-1 and their capacity retention after 100 cycles measured from the second cycle is 96.0%. The high structural stability encountered during lithium insertion and extraction improves the electrochemical properties of the VO2(R)-carbon composite powders.

Original languageEnglish
Pages (from-to)179-187
Number of pages9
JournalElectrochimica Acta
Volume156
DOIs
Publication statusPublished - 2015 Feb 20

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Keywords

  • Anode material
  • Lithium ion battery
  • Spray pyrolysis
  • Vanadium oxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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