Transport properties of ionic liquid electrolytes with organic diluents

被引:92
|
作者
Bayley, Paul M. [1 ]
Lane, George H. [2 ,3 ]
Rocher, Nathalie M. [1 ]
Clare, Bronya R. [3 ]
Best, Adam S. [2 ]
MacFarlane, Douglas R. [3 ]
Forsyth, Maria [1 ]
机构
[1] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia
[2] CSIRO, Div Energy Technol, Clayton, Vic 3168, Australia
[3] Monash Univ, Sch Chem, Clayton, Vic 3800, Australia
基金
澳大利亚研究理事会;
关键词
PHYSICOCHEMICAL PROPERTIES; LITHIUM; CONDUCTIVITY; SOLVENTS; DIFFUSION; MIXTURES; DONOR; CELLS; TFSI;
D O I
10.1039/b902200g
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
Ionic liquids (ILs) form a novel class of electrolytes with unique properties that make them attractive candidates for electrochemical devices. In the present study a range of electrolytes were prepared based on the IL N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl) amide ([C(3)mpyr][NTf(2)]) and LiNTf(2) salt. The traditional organic solvent diluents vinylene carbonate (VC), ethylene carbonate (EC), tetrahydrofuran (THF) and toluene were used as additives at two concentrations, 10 and 20 mol%, leading to a ratio of about 0.6 and 1.3 diluent molecules to lithium ions, respectively. Most promisingly, the lithium ions see the greatest effect in the presence of all the diluents, except toluene, producing a lithium self-diffusion coefficient of almost a factor of 2.5 times greater for THF at 20 mol%. Raman spectroscopy subtly indicates that THF may be effectively breaking up a small portion of the lithium ion-anion interaction. While comparing the measured molar conductivity to that calculated from the self-diffusion coefficients of the constituents indicates that the diluents cause an increase in the overall ion clustering. This study importantly highlights that selective ion transport enhancement is achievable in these materials.
引用
收藏
页码:7202 / 7208
页数:7
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