(266c) Single-Ion Conducting Polymer Electrolyte with Accelarated Segmental Dynamics

With intrinsic flexibillity, non-flammability, scalable membrane formation and tunable mechanical properties, polymer electrolyte is one of the most promising candidates for solid electrolyte. Among these, single-ion conducting polymer electrolytes (SICPEs) are well recognized being the advanced electrolyte system with increased energy efficiency and prolonged cell lifetime. Till now, the pretty low ionic conductivity of SICPEs compared with salt doped polymer and liquid electrolyte remains the bottleneck towards their practical application. Fasten the segmental dynamics by incorporation of the low-Tg polymer segments is an efficient way to improve their ionic conductivity. With many attempts on grafting on the high Mw-PEO and copolymerization of low Mw-PEO with the ionic-liquid like monomers, few attentions have been focused on the tuning the polymer backbone, which should also play a significant role in the segmental dynamics. Herein, we introduce a synthesized SCIPE with both “soft” polymer backbone and side chain that provides dual-accelerated segmental dynamics. Compared with the traditional “rigid” polymer backbones, such as poly(methyl methylacrylate), the soft polymer backbone (PDMS) exhibits much faster segmental dynamic and up to 6-order higher ionic conductivity. Further co-grafting with PEO side chain afford the SICPEs with dual segmental dynamics that allows significantly improved ionic conductivity with the state-of-art SCIPEs.