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A room temperature ionic liquid (RTIL) based on trihexyl (tetradecyl) phosphonium bis (trifluoromethanesulfonyl) imide ( (C₆H₁₃) ₃P (C₁₄H₂₉) TFSI;P66614TFSI) was synthesized and analyzed to determine their characteristics and properties. The bis (trifluoromethanesulfonyl) imide (TFSI) anion is widely studied as an ionic liquid (IL) forming anion which imparts many useful properties, notably electrochemical stability. Especially its electrochemical and physical characteristics for solvent of lithium ion battery were investigated in detail. P₆₆₆₁₄ TFSI exhibits fairly low conductivity (0. 89 mS cm^-1) and higher viscosity (298 K: 277 cP; 343 K: 39 cP) than other ionic liquids, but it exhibits a high thermal stability (over 400^C). Especially corrosion behavior on Al current collector was tested at room temperature and further it was confirmed that thermal resistivity for Al corrosion was highly increased in 1. 0M LiTFSI/P₆₆₆₁₄-TFSI electrolyte comparing with other RTILs by linear sweep thermometry.
Cha et al. (2011) studied this question.
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