Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 13, Pages 5637-5644Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.02.047
Keywords
Lithium battery; Ionic liquid; Electrolyte; Functionalized cation
Funding
- National Key Project of China for Basic Research [2006CB202600]
- National High Technology Research and Development Program of China [2007AA03Z222]
- Shoei Chemical Inc.
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Four new functionalized ILs based on piperidinium and pyrrolidinium cations with two ether groups and TFSI- anion are synthesized and characterized. Physical and electrochemical properties of these ILs, including melting point, thermal stability, viscosity, conductivity and electrochemical stability, are investigated. All the ILs are liquids at room temperature, and the viscosities of P(2o1)(2)-TFSI and P(2o1)(2o2)-TFSI are 55 and 53 mPas at 25 degrees C, respectively. Behavior of lithium redox, chemical stability against lithium metal and charge-discharge characteristics of lithium batteries, are also investigated for these IL electrolytes with 0.6 mol kg(-1) LiTFSI. Though the cathodic limiting potentials of these ILs are 0.4 V versus Li/Li+, the lithium plating and striping on Ni electrode can be observed for these IL electrolytes, and these IL electrolytes show good chemical stability against lithium metal. Li/LiFePO4 cells using these IL electrolytes without additives have good capacity and cycle property at the current rate of 0.1 C, and the cell using the P(2o1)(2o2)-TFSI electrolyte owns good rate property. (C) 2011 Elsevier B.V. All rights reserved.
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