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

Title
Electrochemical impedance spectroscopic characterization on nano-sized Ca3Co3FeO9 electrode with enhanced capacity retention
Authors
고영대강진구박재관김동완
Keywords
Ca3Co3FeO9; Li-ion batteries; Capacity retention; Electrochemical impedance spectroscopy; Charge-transfer kinetics
Issue Date
2010-01
Publisher
Journal of applied electrochemistry
Citation
VOL 40, NO 1, 109-114
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 Ca3Co3FeO9, compared to Co3O4, during prolonged cycling. These results clearly demonstrated the benefits of the inactive CaO matrix that is spontaneously formed in Ca3Co3FeO9 during the first discharge process.
URI
http://pubs.kist.re.kr/handle/201004/37075
ISSN
0021-891X
Appears in Collections:
KIST Publication > Article
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