期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 7, 期 1, 页码 107-112出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2004.11.015
关键词
in situ atomic force microscopy; highly oriented pyrolytic graphite; graphite; lithium intercalation; organic electrolyte; solid electrolyte interphase
The knowledge of dimensional changes during the electrochemical intercalation of Li+ ions in a secondary Li+ ion battery is of fundamental importance for a comprehensive understanding of the degradation mechanism of the negative electrode. In this work in situ electrochemical atomic force microscopy was used to measure the step height change during the intercalation/de-intercalation of Li+ into the graphene layers of highly oriented pyrolytic graphite (HOPG). During the first intercalation/de-intercalation cycle an irreversible increase of graphene layer spacing of about 24 +/- 7% was evidenced. During consecutive repetitive scanning between 3 and 0.005 V vs. Li/Li+, a reversible change of the step height of the HOPG of about +/-17% could be observed in 1 M LiClO4 in ethylene carbonate and dimethyl carbonate in a 1:1 (w/w) ratio. The statistical procedure to determine the height changes introduced in the present study is superior to the evaluation of single line scans. (C) 2004 Elsevier B.V. All rights reserved.
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