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Surface Reaction of LiCoO2/Li System under High-Voltage Conditions by X-ray Spectroscopy and Two-Dimensional Correlation Spectroscopy (2D-COS)

Volume 65, Number 3 (March 2011) Page 320-325

YEONJU PARK, NAM HOON KIM, JONG MYONG KIM, YOUNG CHUL KIM, YEON UK JEONG, SUNG MAN LEE, HYUN CHUL CHOI,* and YOUNG MEE JUNG*


We studied the surface reactions of a LiCoO2/Li cell under high-voltage conditions using X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and two-dimensional correlation spectroscopy (2D-COS). 2D XPS correlation spectra show that Li2CO3 is formed first by decomposition of the organic solvents, and then polycarbonate, which is formed by polymerization of the electrolytes, is produced on the cathode surface of the LiCoO2/Li system under high-voltage conditions. XAS measurements also confirm that the solid electrolyte interface (SEI) layer is formed on the LiCoO2 electrode by decomposition of the organic solvents. The thickness of the SEI layer is less than 100 Å.

Index Headings: Solid electrolyte interface; SEI; LiCoO2/Li; High voltage; X-ray photoelectron spectroscopy; XPS; Two-dimensional correlation spectroscopy; 2D-COS; Lithium-ion battery.