Formation of an SEI on a LiMn2O4 cathode during room temperature charge-discharge cycling studied by soft X-ray absorption spectroscopy at the Fluorine K-edge

Title
Formation of an SEI on a LiMn2O4 cathode during room temperature charge-discharge cycling studied by soft X-ray absorption spectroscopy at the Fluorine K-edge
Authors
정경윤윤원섭김광범조병원Xiao-Qing Yang
Keywords
LiMn2O4; SEI; soft X-ray absorption spectroscopy; LiF; Lithium secondary batteries
Issue Date
2011-11
Publisher
Journal of applied electrochemistry
Citation
VOL 41, NO 11, 1295-1299
Abstract
The solid electrolyte interface (SEI) formation on the surface of LiMn2O4 electrodes during room temperature charge–discharge cycling was studied using soft X-ray absorption spectroscopy at the Fluorine (F) K-edge. LiMn2O4 electrodes without any binder were prepared by electrostatic spray deposition to eliminate the signal originating from the PVDF binder in the F K-edge X-ray absorption spectra. The F K-edge absorption spectra show that the SEI layer forms at a very early stage of cycling. SEI growth takes place during discharge. In addition, LiF formation is accelerated if the discharge step follows a charge step. The F K-edge absorption spectra suggest that the major component of the SEI is LiF.
URI
http://pubs.kist.re.kr/handle/201004/40502
ISSN
0021-891X
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