The thermal phase behavior of 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (IM 10 R TFSI where R = 1, 2, or 4 for methyl, ethyl or butyl, respectively) ionic liquid binary mixtures with LiTFSI have been investigated as models for electrolytes for lithium batteries. Diverse phase behavior is found with significant variations noted from similar mixtures in which the imidazolium cations are replaced with N -alkyl- N -methylpyrrolidinium cations. The crystal structure for a (1− x ) IM 101 TFSI-( x ) LiTFSI ( x = 0.50) (or 1/1 IM 101 TFSI/LiTFSI) phase is reported to further clarify the molecular level interactions occurring in these binary salt mixtures.
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Zhou et al. (2009) studied this question.
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