2-Methoxyethyl (methyl) carbonate-based electrolytes for Li-ion batteries

被引：107

作者：

Gu, GY ^{[1
]}

Bouvier, S ^{[1
]}

Wu, C ^{[1
]}

Laura, R ^{[1
]}

Rzeznik, M ^{[1
]}

Abraham, KM ^{[1
]}

机构：

[1] Covalent Associates Inc, Woburn, MA 01801 USA

来源：

ELECTROCHIMICA ACTA | 2000年 / 45卷 / 19期

基金：

美国国家卫生研究院;

关键词：

organic electrolytes; Li-ion batteries; conductivity;

D O I：

10.1016/S0013-4686(00)00394-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

2-Methoxyethyl (methyl) carbonate (MOEMC) has been identified as a useful solvent for rechargeable Li-ion batteries. The conductivity-temperature and viscosity-temperature data for Li salt solutions in MOEMC can be fitted to the Vogel-Tammann-Fulcher (VTF) equation. The electrolytes formulated in MOEMC are characterized by the appearance of glass-transition temperatures without encountering freezing points, and this unique low-temperature behavior has allowed us to experimentally determine their glass-transition temperatures. This in turn has enabled us to experimentally demonstrate the application of the VTF theory to explain the conductivity-temperature data of these electrolytes. The results support a solvent-assisted ion conduction mechanism attributable to the strong interactions between the solvent molecules and Li ions. There appears to be no strong interaction between solvent molecules and the anions, but because of ion-pairing, the anion conduction is indirectly assisted by solvent fluctuations. Strong interactions between the solvent and Li+ have been verified by nuclear magnetic resonance (NMR) and infrared (IR) spectroscopic data. The electrolytes formulated in MOEMC have been tested for their electrochemical stability and Li cycling performance of the graphite anode and the LiCoO2 cathode, thereby demonstrating their utility for Li-ion battery development. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：3127 / 3139

页数：13

共 39 条

[1] MIXED ETHER ELECTROLYTES FOR SECONDARY LITHIUM BATTERIES WITH IMPROVED LOW-TEMPERATURE PERFORMANCE [J].