title: Surface reaction of LiCoO2/Li system under high-voltage conditions by X-ray spectroscopy and two-dimensional correlation spectroscopy (2D-COS).
abstract: We studied the surface reactions of a LiCoO(2)/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 Li(2)CO(3) 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 LiCoO(2)/Li system under high-voltage conditions. XAS measurements also confirm that the solid electrolyte interface (SEI) layer is formed on the LiCoO(2) electrode by decomposition of the organic solvents. The thickness of the SEI layer is less than 100 Å.
authors.affiliation: Department of Chemistry, and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 200-701, Korea.
authors.forename: Yeonju
authors.initials: Y
authors.lastname: Park
authors.forename: Nam Hoon
authors.initials: NH
authors.lastname: Kim
authors.forename: Jong Myong
authors.initials: JM
authors.lastname: Kim
authors.forename: Young Chul
authors.initials: YC
authors.lastname: Kim
authors.forename: Yeon Uk
authors.initials: YU
authors.lastname: Jeong
authors.forename: Sung Man
authors.initials: SM
authors.lastname: Lee
authors.forename: Hyun Chul
authors.initials: HC
authors.lastname: Choi
authors.forename: Young Mee
authors.initials: YM
authors.lastname: Jung