Abstract
A vertical split electrode (VSE) with three layers was developed to investigate the formation of the solid electrolyte interphase (SEI) during first charge of graphite electrodes in lithium ion batteries. Ex-situ X-ray photoelectron spectroscopy (XPS) on each layer revealed that the first layer showed distinctively different signal patterns in the O 1s and C 1s regions. It was concluded that the SEI formed in the first layer closest to the counter electrode is thicker as well as different in chemical nature as compared to the SEI in the electrode bulk.
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