A study of the Li/Li+ couple in DMC and PC solvents -: Part 1:: Characterization of LiAsF6/DMC and LiAsF6/PC solutions

被引：80

作者：

Doucey, L

Revault, M

Lautié, A

Chaussé, A

Messina, R

机构：

[1] CNRS, Lab Mat Polymeres Interfaces, F-94320 Thiais, France

[2] CNRS, Spectrochim Infrarouge & Raman Lab, F-94320 Thiais, France

来源：

ELECTROCHIMICA ACTA | 1999年 / 44卷 / 14期

关键词：

D O I：

10.1016/S0013-4686(98)00365-X

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The structures of LiAsF6/DMC and LiAsF6/PC solutions have been investigated at 300 K by infrared and Raman spectroscopies in the 4000-200 cm(-1) wavenumber range using various salt concentrations. A dissociation of the lithium salt into its ionic species, Li+ and AsF6-, occurs in PC solutions. In DMC solutions, analysis of the v(3) AsF6- mode reveals the presence of contact ion-pairs Li+...AsF6-, free AsF6- ions, solvated ion-pairs [Li(DMC)(4)](+) AsF6-, and polymeric ion-pairs (Li+...AsF6-)(x) when the salt concentration changes from 0.1 to 4.5 mol dm(-3). Moreover, we have shown that the conformational equilibrium of DMC was modified by the solvation of lithium ions strongly increasing the amount of the minor conformer. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：2371 / 2377

页数：7

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