Preparation of room temperature ionic liquids based on aliphatic onium cations and asymmetric amide anions and their electrochemical properties as a lithium battery electrolyte

Potentialities of ionic liquids as new electrolyte media in advanced electrochemical devices

“…With the aim of lowering the viscosity of the aliphatic quaternary ammonium systems, it has been attempted to substitute TFSI with (2,2,2-trifluoro-N-trifluoromethylsulfonyl) acetamide (TSAC) anion (see scheme in Fig. 7), which has an asymmetrical structure and a molecular weight lower than that of the TFSI anion, such as to form low melting and low viscous RTILs [23]. Unfortunately, the electrochemical stability of Another method to reduce the viscosity and the melting point of the aliphatic ammonium systems could be the introduction of an alkoxy group into the tetraalkylammonium cation [22].…”

Electrolytes Containing Ionic Liquids for Improved Safety of Lithium-ion Batteries

“…As already reported, a large capacity fading was observed even at 1.0 C mA for discharge on the cell with neat PP13-TFSI. 12,14 However, it is clear that the cell containing the mixed electrolyte is able to exhibit a large capacity even at 1.0 C mA in this study. This result suggested that it would be possible to use lithium-ion cells containing mixtures of PP13-TFSI and organic solvents as electrolytes in high-power applications by optimization of the cell design.…”

“…The electrochemical stability of the ionic liquid was found to be sufficient for lithium cells; however, there were some limitations in terms of application in cells with high-power requirements, such as HVs, because of the higher viscosity and lower ionic conductivity of the electrolyte than those of conventional organic electrolytes. 13,14 Furthermore, some researchers also reported mixtures of the electrolyte with organic solvents and ionic liquids. 15,16 Ionic liquids may also be applicable as flame-retardant additives for improving the safety of lithium-ion cells containing flammable organic solvents, because they are nonflammable and non-volatile.…”

Ionic Liquids for the Future Electrochemical Applications

“…However, Li-ion batteries consist of conventional electrolytes, such as ethylene carbonate, dimethyl carbonate, and diethyl carbonate, may suffer thermal runaway and cell rupture if over heated or overcharged. A significant research effort into RTILs-based electrolytes have been thus made to pursue a safe battery in the last years (Matsumoto et al, 2005;Sakaebe et al, 2007;Noto et al, 2010). An electrolyte of lithium batteries based on the ionic liquid PMIMTFSI complexed with lithium bis LiTFSI at a molar ratio of 1:1 has been reported by Kim et al (2010).…”