LiTFSI-BEPyTFSI as an improved ionic liquid electrolyte for rechargeable lithium batteries
LiTFSI-BEPyTFSI as an improved ionic liquid electrolyte for rechargeable lithium batteries
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DOI：
10.1016/j.jpowsour.2007.09.013
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发表时间：
2007-11-22
影响因子：
9.2
通讯作者：
Ohno, H.
中科院分区：
文献类型：
--
作者：
Fernicola, A.;Croce, F.;Ohno, H.
本文报道了双（三氟甲磺酰基）亚胺锂（LiTFSI）在N-正丁基-N-乙基吡咯烷双（三氟甲磺酰基）亚胺（BEPyTFSI）中的电化学研究。我们表明这些离子液体溶液对锂金属电极具有稳定性，这允许各种电化学测试，包括阻抗谱和伏安法。离子电导率和锂迁移数分别为10（-3）S cm（-1）和0.4的量级，使得这些溶液适合用作先进锂电池中的电解质。这些电池的原型，具有磷酸铁锂作为阴极，在充放电效率和倍率性能方面显示出良好的性能。在这项工作中报告的结果，虽然是初步的，是令人鼓舞的，在支持这类锂导电离子液体的LiTFSI-BEPyTFSI的实际利益。(C)2007 Elsevier B. V.保留所有权利。
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.