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Novel polymerized ionic liquids having an organoboron unit were prepared for the purpose of selective lithium cation transport. Hydroboration polymerization of 1,3-diallylimidazolium bromide and subsequent anion exchange reaction with LiTFSI lithium bis(trifluoromethylsulfonyl)imide afforded the corresponding organoboron polymer electrolytes in 89−81% yield. The structure of polymers was supported by 1 H and 11 B NMR spectra. After the addition of an equimolar amount of LiTFSI toward the organoboron unit, an ionic conductivity of 3.74 × 10 -5 −1.93 × 10 -5 S/cm was observed at 50 °C. The lithium transference number for these systems was 0.87−0.45 at 30 °C. This demonstrates that anion trapping of the organoboron unit works very effectively in IL-based matrices compared with polyether-type matrices.
Matsumi et al. (Sat,) studied this question.