Electrochemical impedance spectroscopic characterization on nano-sized Ca3Co3FeO9 electrode with enhanced capacity retention

Young Dae Ko, Jin Gu Kang, Jae Gwan Park, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A Ca3Co3FeO9 electrode exhibiting enhanced cycle-life performance compared to that of Co3O4 was presented in this study. In order to examine the mechanism of the improved capacity retention in the Ca3Co3FeO9 electrode, the cycling-induced variation of electrode kinetics was observed using electrochemical impedance spectroscopy. The separable electrochemical reactions using the appropriate equivalent circuit and the goodness-of-fit results demonstrated the superior charge-transfer kinetics of Ca3Co 3FeO9, compared to Co3O4, during prolonged cycling. These results clearly demonstrated the benefits of the inactive CaO matrix that is spontaneously formed in Ca3Co 3FeO9 during the first discharge process.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalJournal of Applied Electrochemistry
Volume40
Issue number1
DOIs
Publication statusPublished - 2010 Jan
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgments This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2009-0082544).

Keywords

  • CaCoFeO
  • Capacity retention
  • Charge-transfer kinetics
  • Electrochemical impedance spectroscopy
  • Li-ion batteries

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry
  • Materials Chemistry

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