Phosphonium-Based Ionic Liquids
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Lithium secondary batteries are energy storage devices that have been extensively studied and developed for a wide range of practical applications (Tarascon and Armand in Nature 414:359–367, 2001). In recent years, not only charge-discharge performance of the batteries but also their safe performance has been high priorities for all uses of lithium secondary batteries due to the fact that the volatility and inflammability of organic electrolytes often cause serious safety problems. Room temperature ionic liquids (RTILs) have been regarded as suitable safe electrolytes for lithium secondary batteries because of their unique physicochemical properties. Recently, RTILs based on quaternary phosphonium cations have been receiving a great deal of attention as potential substitutes for conventional RTILs. In this chapter, works on preparation, physicochemical characterizations and battery tests of phosphonium RTILs are reviewed.
KeywordsLithium Battery Linear Sweep Voltammograms Lithium Secondary Batterie Ethyl Methyl Carbonate Nucleophilic Addition Reaction
This work was partially supported by the Grant-in-Aid for Scientific Research (No. 22550131) from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and by the Environment Research and Technology Development Fund (3K123018) of the Ministry of the Environment, Japan. The author is grateful to Nippon Chemical Industrial Co., Ltd. and Professor Dr. M. Matsumiya, Yokohama National University, for collaboration in the development of the phosphonium based RTILs.
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