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.
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Chungnam Natl Univ, Grad Sch Green Energy Technol, Taejon 305764, South KoreaChungnam Natl Univ, Grad Sch Green Energy Technol, Taejon 305764, South Korea
Song, Jin-Woo
Cao Cuong Nguyen
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Chungnam Natl Univ, Dept Fine Chem Engn & Appl Chem, Taejon 305764, South KoreaChungnam Natl Univ, Grad Sch Green Energy Technol, Taejon 305764, South Korea
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Banaras Hindu Univ, Dept Phys, Ion Liquid & Solid State Ion Lab, Varanasi 221005, IndiaBanaras Hindu Univ, Dept Phys, Ion Liquid & Solid State Ion Lab, Varanasi 221005, India
Balo, Liton
Gupta, Himani
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Banaras Hindu Univ, Dept Phys, Ion Liquid & Solid State Ion Lab, Varanasi 221005, IndiaBanaras Hindu Univ, Dept Phys, Ion Liquid & Solid State Ion Lab, Varanasi 221005, India
Gupta, Himani
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Singh, Shishir Kumar
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Singh, Varun Kumar
Kataria, Shalu
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Univ Allahabad, Ctr Mat Sci, IIDS, Allahabad 211002, Uttar Pradesh, IndiaBanaras Hindu Univ, Dept Phys, Ion Liquid & Solid State Ion Lab, Varanasi 221005, India