Two-dimensional hetero-spectral Raman/XAS correlation analysis of Li[Ni0.45Co0.18Mn0.25Al0.12] O2 cathode in the overcharged state

Park, Yeonju; Kim, Nam Hoon; Choi, Hyun Chul; Lee, Sung Man; Hwang, Hoon; Jeong, Yeon Uk; Jung, Young Mee

doi:10.1016/j.vibspec.2012.03.004

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Two-dimensional hetero-spectral Raman/XAS correlation analysis of Li[Ni0.45Co0.18Mn0.25Al0.12] O2 cathode in the overcharged state

Park, Yeonju;
Kim, Nam Hoon;
Choi, Hyun Chul;
Lee, Sung Man;
Hwang, Hoon;
... Jung, Young Mee;
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초록

We investigated an electrochemical reaction on the cathode surface of an overcharged Li[Ni0.45Co0.18Mn0.25Al0.12]O-2/Li system at the molecular level by using Raman, X-ray absorption spectroscopy (XAS), and 2D hetero-spectral correlation analyses. Changes in the Raman spectra during the overcharging process showed that variations in the local atomic environment occurred with increasing extraction of Li+ ions. XAS spectra obtained during the overcharging process showed that oxidized transition metals coexisted with inoxidizable transition metals. Additionally, synchronous 2D hetero-spectral Raman/XAS correlation spectra clearly elucidated the correlation between the Raman and XAS bands, confirming their band assignments. (C) 2012 Elsevier B.V. All rights reserved.

키워드

Li-ion battery; Overcharge; Raman spectroscopy; X-ray absorption spectroscopy; 2D hetero-spectral correlation spectroscopy; RAY-ABSORPTION-SPECTROSCOPY; LITHIUM-ION BATTERIES; ELECTROLYTE; SURFACE; XAS

제목: Two-dimensional hetero-spectral Raman/XAS correlation analysis of Li[Ni0.45Co0.18Mn0.25Al0.12] O2 cathode in the overcharged state

저자: Park, Yeonju; Kim, Nam Hoon; Choi, Hyun Chul; Lee, Sung Man; Hwang, Hoon; Jeong, Yeon Uk; Jung, Young Mee

DOI: 10.1016/j.vibspec.2012.03.004

발행일: 2012-05

유형: Article

저널명: Vibrational Spectroscopy

권: 60

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