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

被引：11

作者：

Park, Yeonju ^{[3
,4
]}

Kim, Nam Hoon ^{[3
,4
]}

Kim, Jong Myong ^{[5
]}

Kim, Young Chul ^{[5
]}

Jeong, Yeon Uk ^{[6
]}

Lee, Sung Man ^{[7
]}

Choi, Hyun Chul ^{[1
,2
]}

Jung, Young Mee ^{[3
,4
]}

机构：

[1] Chonnam Natl Univ, Dept Chem, Kwangju 500757, South Korea

[2] Chonnam Natl Univ, Inst Basic Sci, Kwangju 500757, South Korea

[3] Kangwon Natl Univ, Dept Chem, Chunchon 200701, South Korea

[4] Kangwon Natl Univ, Inst Mol Sci & Fus Technol, Chunchon 200701, South Korea

[5] Agcy Def Dev, Taejon 305152, South Korea

[6] Kyungpook Natl Univ, Sch Mat Sci & Engn, Taegu 702701, South Korea

[7] Kangwon Natl Univ, Dept Adv Mat Sci & Engn, Chunchon 200701, South Korea

来源：

APPLIED SPECTROSCOPY | 2011年 / 65卷 / 03期

关键词：

Solid electrolyte interface; SEI; LiCoO2/Li; High voltage; X-ray photoelectron spectroscopy; XPS; Two-dimensional correlation spectroscopy; 2D-COS; Lithium-ion battery; THIN-FILM ELECTRODE; LI-ION BATTERIES; ABSORPTION-SPECTROSCOPY; LITHIUM DEINTERCALATION; CATHODE MATERIALS; ELECTROCHEMICAL OXIDATION; MECHANISM; RAMAN; XPS; INTERFACE;

D O I：

10.1366/10-06073

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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 (SE!) layer is formed on the LiCoO2 electrode by decomposition of the organic solvents. The thickness of the SEI layer is less than 100 angstrom.

引用

页码：320 / 325

页数：6

共 33 条

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