Enhanced Lithium Transference Numbers in Ionic Liquid Electrolytes

被引：203

作者：

Froemling, T. ^{[1
]}

Kunze, M. ^{[2
]}

Schoenhoff, M. ^{[2
]}

Sundermeyer, J. ^{[1
]}

Roling, B. ^{[1
]}

机构：

[1] Univ Marburg, Fachbereich Chem, D-35032 Marburg, Germany

[2] Univ Munster, Inst Phys Chem, D-48149 Munster, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 41期

关键词：

D O I：

10.1021/jp804097j

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：

Ion transport processes in mixtures of N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) and lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) were characterized by ac impedance spectroscopy and pulsed field gradient NMR. Molar ratios x n(Li-TFSI)/(n(Li-TFSI) + n(BMP-TFSI)) up to 0.377 could be achieved without crystallization. From the bulk ionic conductivity and the individual diffusion coefficients of cations and anions we calculate the Haven ratio and the apparent lithium transference number. Although the Haven ratio exhibits typical values for ionic liquid electrolytes, the maximal apparent lithium transference number is higher than found in other recent studies on ionic liquid electrolytes containing lithium ions. On the basis of these results we discuss strategies for further improving the lithium transference number of such electrolytes.

引用

页码：12985 / 12990

页数：6

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