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http://dx.doi.org/10.7316/KHNES.2013.24.2.179

Effects of Charge-discharge Rate on Morphology and Resistance of Surface Film on a Graphite Negative Electrode in an Ethylene Carbonate-based Solution  

Jeong, Soonki (Department of Chemical Engineering, Soonchunhyang University)
Kim, Pogyom (Department of Chemical Engineering, Soonchunhyang University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.24, no.2, 2013 , pp. 179-185 More about this Journal
Abstract
The behavior of surface film formation was greatly dependent on the speed of potential cycling. In $LiClO_4$ / EC + DEC, cyclic voltammetry results showed that the peaks originated from surface film formation on graphite electrode at the high charge-discharge rate was shifted to the lower potentials as the charge-discharge rate decrease. This indicates that surface films with different morphology and thickness were formed by different charge-discharge rate. Transmission electron microscopy (TEM) results indicated that the properties such as thickness and morphology of the surface film were greatly affected by the charge-discharge rate. Electrochemical impedance spectroscopy (EIS) showed that the resistance of surface film was affected by the speed of potential cycling. In addition, the charge transfer resistance was also dependent on the charge-discharge rate indicating that the charge transfer reaction was affected by the nature of surface film. TEM and EIS results suggested that the chemical property as well as the physical property of the surface film was affected by the charge-discharge rate.
Keywords
Graphite negative electrode; Surface film; Interfacial reaction; Charge-discharge rate; Ethylene carbonate;
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Times Cited By KSCI : 2  (Citation Analysis)
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