Mixed ionic liquid as electrolyte for lithium batteries

被引:124
作者
Diaw, A
Chagnes, A
Carré, B
Willmann, P
Lemordant, D
机构
[1] Univ Tours, Lab Chim Phys Interfaces & Milieux React, EA2098, Fac Sci & Tech, F-37200 Tours, France
[2] Univ Cheikh Anta Diop, Dakar, Senegal
[3] CNES, F-31055 Toulouse, France
关键词
lithium battery; ionic liquid; electrolyte; alkylimidazolium and pyridinium based electrolytes;
D O I
10.1016/j.jpowsour.2005.03.068
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 like 1-butyl-3-methylimidazolium tetrafluoroborate (IMIBF4) or hexafluorophosphate (IMlPF(6)) and 1-butyl-4-methylpyridinium tetrafluoroborate (PyBF4) were mixed with organic solvents such as butyrolactone (BL) and acetonitrile (ACN). A lithium salt (LiBF4 or LiPF6) was added to these mixtures for possible application in the field of energy storage (batteries or supercapacitors). Viscosities, conductivities and electrochemical windows at a Pt electrode of these electrolytes were investigated. All studied electrolytes are stable toward oxidation and exhibit a vitreous phase transition, which has been determined by application of the VTF theory to conductivity measurements. Mixtures containing the BF4- anion exhibit the lowest viscosity and the highest conductivity. Two mixtures have been optimized in terms of conductivity: BL/lMIBF(4) (60/40, v/v) and ACN/IMIBF4 (70/30, v/v). (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:682 / 684
页数:3
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