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2015
ACL
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S.Delacroix, F.Sauvage, M.Reynaud, M.Deschamps, S.Bruyère, M.Becuwe, D.Postel, J.M.Tarascon, A.Nguyen Van Nhien, 'SiO2 / ionic liquid hybrid nanoparticles for solid-state lithium-ion conduction', Chem. Mat. 27 7926–7933 (2015) doi:10.1021/acs.chemmater.5b02944
We report on an in-depth physical and electrical characterization of a series of substituted imidazoliums ionic liquids (ILs) grafted on Stöber-type SiO2. For first time, we demonstrate that this hybrid architecture affords increasing of the lithium transference number by hampering TFSI- mobility and show the effective grafting mechanism between SiO2 surface and the ILs bearing silanol anchoring group. When doped with 16 % wt. LiTFSI, the resulting hybrid material based on long alkyl arm chain exhibits a lithium diffusion coefficient of 2.10-12 m2/s (at 87°C), 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.
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