American Chemical Society, Chemistry of Materials, 23(27), p. 7926-7933, 2015
DOI: 10.1021/acs.chemmater.5b02944
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We report the physical and electrical characterization of a series of substituted imidazolium-based ionic liquids grafted on Stöber-type SiO2. This hybrid architecture affords an increase of the lithium transference to 0.56 by hindering TFSI- (bis(trifluoromethane)sulfonimide) mobility to the total ionic conductivity. When doped with 16 wt % wt LiTFSI, the resulting hybrid organic/inorganic solid material exhibits a lithium diffusion coefficient of 2 × 10-12 m2/s at 87 °C and a conductivity of ca. 10-6 S/cm at room temperature and 10-4 S/cm at 65 °C with an activation energy barrier of 0.89 eV.