Flame spray pyrolysis for finding multicomponent nanomaterials with superior electrochemical properties in the CoOx-FeOx system for use in lithium-ion batteries

Jung Hyun Kim, Jong Heun Lee, Yun Chan Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

High-temperature flame spray pyrolysis is employed for finding highly efficient nanomaterials for use in lithium-ion batteries. CoOx-FeOx nanopowders with various compositions are prepared by one-pot high-temperature flame spray pyrolysis. The Co and Fe components are uniformly distributed over the CoOx-FeOx composite powders, irrespective of the Co/Fe mole ratio. The Co-rich CoOx-FeOx composite powders with Co/Fe mole ratios of 3:1 and 2:1 have mixed crystal structures with CoFe2O4 and Co3O4 phases. However, Co-substituted magnetite composite powders prepared from spray solutions with Co and Fe components in mole ratios of 1:3, 1:2, and 1:1 have a single phase. Multicomponent CoOx-FeOx powders with a Co/Fe mole ratio of 2:1 and a mixed crystal structure with Co3O4 and CoFe2O4 phases show high initial capacities and good cycling performance. The stable reversible discharge capacities of the composite powders with a Co/Fe mole ratio of 2:1 decrease from 1165 to 820 mAhg-1 as the current density is increased from 500 to 5000 mAg-1; however, the discharge capacity again increases to 1310 mAhg-1 as the current density is restored to 500 mAg-1.

Original languageEnglish
Pages (from-to)2826-2830
Number of pages5
JournalChemistry - An Asian Journal
Volume9
Issue number10
DOIs
Publication statusPublished - 2014 Oct 1

Keywords

  • Batteries
  • Energy storage
  • Flame spray pyrolysis
  • Gas-phase reaction
  • Nanostructured materials

ASJC Scopus subject areas

  • Chemistry(all)

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