Electrochemical study of highly ordered pyrolytic graphite surface film formation by in-situ atomic force microscopy = In-situ atomic force microscopy을 이용한 결정성 탄소 전극 피막

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In-situ electrocheimical atomic force microscopy (ECAFM) was used to study the surface film that forms on highly ordered pyrolytic graphite (HOPG) electrode during cathodic polarization. Cyclic volatammetry experiments confirmed that distinct reduction reactions occur when the potential of a fresh HOPG electrode is swept from 2.4 to 0.01 V vs. $Li/Li^+$. The reactions appear to be irreversible, since no evidence of corresponding oxidation reaction was observed. ECAFM results, when combined with cyclic voltammetry data, suggest that these contribute to form surface film. The surface film is differently formed dependent on solvent and electrolyte salt. It is observed by EC AFM that the morphology of surface film in 1 M $LiClO_4-EC/DMC$ is more smooth and compact than that in 1 M $LiPF_6-EC/DMC$ and that in 1 M $LiClO_4-PC$ is absent. In addition, it is proved that the addition of 12 crown 4 ether improves the surface film formation in 1 M $LiClO_4-PC$. When considered with the second cycle of CV experiment, the ECAFM results confirm that the further electrolyte decomposition has the correlation with the formation of surface film.
Advisors
Kwak, Ju-Hyounresearcher곽주현researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
1999
Identifier
151668/325007 / 000973146
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 1999.2, [ iii, 45 p. ]

Keywords

Surface film formation; In-situ atomic force microscopy; Li-ion battery; Carbon; 탄소; 피막형성; 전기화학적 원자력 현미경; 리튬이온전지

URI
http://hdl.handle.net/10203/31809
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=151668&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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