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
- 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
- 정경윤; 윤원섭; 김광범; 조병원; Xiao-Qing Yang
- LiMn2O4; SEI; soft X-ray absorption spectroscopy; LiF; Lithium secondary batteries
- Issue Date
- Journal of applied electrochemistry
- VOL 41, NO 11, 1295-1299
- 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.
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