LiTFSI-BEPyTFSI as an improved ionic liquid electrolyte for rechargeable lithium batteries

被引:230
|
作者
Fernicola, A. [1 ]
Croce, F. [1 ]
Scrosati, B. [1 ]
Watanabe, T. [2 ]
Ohno, H. [2 ]
机构
[1] Univ Roma La Sapienza, Dept Chem, I-00185 Rome, Italy
[2] Tokyo Univ Agr & Technol, Dept Biotechnol, Tokyo 1848588, Japan
关键词
ionic liquids; electrochemistry; lithium; batteries;
D O I
10.1016/j.jpowsour.2007.09.013
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
We report an electrochemical study of solutions of lithium bis(trifluoromethanesulfonyl)imide, LiTFSI, in a N-n-butyl-N-ethylpyrrolidinium bis(trifluoromethanesulfonyl)in-tide, BEPyTFSI. We show that these ionic liquid solutions have stability towards lithium metal electrode which allows various electrochemical tests, including impedance spectroscopy and voltammetry. The ionic conductivity and lithium transference number, of the order of 10(-3) S cm(-1) and 0.4, respectively, make these solutions suitable for application as electrolytes in advanced lithium batteries. A prototype of these batteries, having lithium iron phosphate as the cathode, showed good performance in terms of charge-discharge efficiency and rate capability. The results reported in this work, although preliminary, are encouraging in supporting the practical interest of this LiTFSI-BEPyTFSI class of lithium conducting ionic liquids. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:342 / 348
页数:7
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