Improving the electrochemical properties of graphite/LiCoO2 cells in ionic liquid-containing electrolytes

被引：37

作者：

Choi, Nam-Soon ^{[1
]}

Lee, Yongbeom ^{[1
]}

Kim, Sung-Soo ^{[1
]}

Shin, Soon-Cheol ^{[1
]}

Kang, Yong-Mook ^{[2
]}

机构：

[1] Samsung SDI Co Ltd, Corp R&D Ctr, Yongin 446577, Gyeonggi Do, South Korea

[2] Kongju Natl Univ, Div Adv Mat Engn, Cheonan 330717, Chungnam, South Korea

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 08期

关键词：

Graphite; Lithium cobalt oxide; Ionic liquid; Fluoroethylene carbonate; Lithium-ion battery; FLUOROETHYLENE CARBONATE; NATURAL GRAPHITE; LITHIUM; BATTERIES; ANODE; INTERCALATION; SOLVENT; SALT;

D O I：

10.1016/j.jpowsour.2009.10.063

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrochemical performance of graphite/lithium cobalt oxide (LiCoO2) cells in N-methoxymethyl-N,N-dimethylethylammonium bis(trifluoromethane-sulfonyl) imide (MMDMEA-TFSI)-containing electrolytes is significantly enhanced by the formation of a fluoroethylene carbonate (FEC)-derived protective film on an anode during the first cycle. The electrochemical intercalation of MMDMEA cations into the graphene layer is readily visualized by ex situ transmission electron microscopy (TEM). Moreover, differences in the X-ray diffraction (XRD) patterns of graphite electrodes in cells charged with and without FEC in dimethyl carbonate (DMC)/MMDMEA-TFSI are clearly discernible. Conclusively, the presence of FEC in MMDMEA-TFSI-containing electrolytes leads to a remarkable enhancement of discharge capacity retention for graphite/LiCoO2 cells as compared with ethylene carbonate (EC) and vinylene carbonate (VC). (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：2368 / 2371

页数：4

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