Raman study of lithium coordination in EMI-TFSI additive systems as lithium-ion battery ionic liquid electrolytes

被引：120

作者：

Hardwick, Laurence J. ^{[1
]}

Holzapfel, Michael ^{[1
]}

Wokaun, Alexander ^{[1
]}

Novak, Petr ^{[1
]}

机构：

[1] Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2007年 / 38卷 / 01期

关键词：

EMI-TFSI; lithium coordination; ionic liquids; ethylene carbonate; vinylene carbonate;

D O I：

10.1002/jrs.1632

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Raman spectroscopy was performed on various mixtures of the ionic liquid salt, 1-ethyl-3methylimidazolium-bis(trifluoromethylsulfonyl)imide (EMI-TFSI). When EMI-TFSI is used in combination with a lithium salt, it could be a potential electrolyte for lithium-ion or lithium metal batteries. The Raman spectra of EMI-TFSI, EMI-TFSI 0.5(M) Li-TFSI, EMI-TFSI 0.5 m Li-TFSI 2 m vinylene carbonate (VC) and EMI-TFSI 0.5 Li-TFSI 2 m ethylene carbonate (EC) were collected and compared. A comparison of the peak positions of the delta(s) CF(3) mode at 742 cm(-1) demonstrates that when carbonate additives are present, the lithium ion is no longer interacting with the TFSI anion. Instead, it is coordinated with the carbon-oxygen double bond of the carbonates. Copyright (c) 2006 John Wiley & Sons, Ltd.

引用

页码：110 / 112

页数：3

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