期刊
JOURNAL OF POWER SOURCES
卷 196, 期 24, 页码 10679-10685出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.08.097
关键词
Lithium ion batteries; SEI; HX-PES
资金
- New Energy and Industrial Technology Department Organization (NEDO)
Solid electrolyte interface (SEI) films formed on Li1-xCoO2 electrodes were observed with hard X-ray photoelectron spectroscopy (FIX-PES). This paper particularly focuses on film thickness estimation using HX-PES with theoretical calculation. The validity of the calculation was proven by experiments using model SEI films. The native film formed on a LiCoO2 composite electrode was estimated to be LiF with its thickness of 5 nm. Formation of Co (II) species on top of LiCoO2 was also indicated. Storage of the electrode at 60 degrees C brought about considerable film growth (30-40 nm) with carbonate compounds formation. SEI film changes during charging of the LiCoO2 electrode were also examined. The main component in the film was deduced to be LiF or a kind of fluorite, with its thickness decreased during charging. The SEI formation mechanisms are also elucidated. (C) 2011 Elsevier B.V. All rights reserved.
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