Ion conduction behaviour in chemically crosslinked hybrid ionogels: effect of free-dangling oligoethyleneoxides

摘要

A series of PEO-functionalized, ladder-like structured polysilsesquioxane copolymers were synthesized and utilized for the fabrication of PEGylated hybrid ionogels through chemical crosslinking of the ionic liquid, 1 M LiTFSI in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. Through systematic variance of the copolymer concentration of methacryloxypropyl- and PEG groups, we were able to demonstrate nhanced ionic conductivity and lithium ion dissociation as the PEO content increased. Through an in- depth spectroscopic investigation of the ion conduction behavior of these PEGylated hybrid ionogels nd comparison with hybrid ionogels without PEG groups, we were able to demonstrate how the nhancement in lithium ion battery performance for PEGylated hybrid iongels could be achieved at dentical crosslinker concentrations.