A rechargeable lithium metal battery operating at intermediate temperatures using molten alkali bis(trifluoromethylsulfonyl)amide mixture as an electrolyte

被引:61
作者
Watarai, Atsushi [1 ]
Kubota, Keigo [1 ]
Yamagata, Masaki [1 ]
Goto, Takuya [1 ]
Nohira, Toshiyuki [1 ]
Hagiwara, Rika [1 ]
Ui, Koichi [2 ]
Kumagai, Naoaki [2 ]
机构
[1] Kyoto Univ, Grad Sch Energy Sci, Dept Fundamental Energy Sci, Sakyo Ku, Kyoto 6068501, Japan
[2] Iwate Univ, Grad Sch Engn, Dept Frontier Mat & Funct Engn, Morioka, Iwate 0208551, Japan
关键词
lithium battery; molten salt; ionic liquid; bis(trifluoromethylsulfonyl)amide; LiFePO4; olivine;
D O I
10.1016/j.jpowsour.2008.05.054
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
The physicochemical properties of molten alkali bis(trifluoromethylsulfonyl)amide, MTFSI (M = Li, K, Cs), mixture (chi(LiTFSI) = 0.20, chi(KTFSI) = 0.10, chi(CsTFSI) = 0.70) were studied to develop a new rechargeable lithium battery operating at intermediate temperature (100-180 degrees C). The viscosity and ionic conductivity of this melt at 150 degrees C are 87.2 cP and 14.2 mS cm(-1), respectively. The cyclic voltammetry revealed that the electrochemical window at 150 degrees C is as wide as 5.0 V, and that the electrochemical deposition/dissolution of lithium metal occurs at the cathode limit. A Li/MTFSI (M = Li, K, Cs)/LiFePO4 cell showed an excellent cycle performance at a constant current rate of C/10 at 150 degrees C; 95% of the initial discharge capacity was maintained after 50 cycles. Except for the initial few cycles, the coulombic efficiencies were approximately 100% for all the cycles, indicating the stabilities of the molten MTFSI mixture and all the electrode materials. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:724 / 729
页数:6
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