Abstract
Nanocomposite polymer electrolytes (NCPE) have been prepared by blending poly (ethylene oxide) (PEO) and polyhedral oligomeric silsesquioxane-functionalized with poly (ethylene glycol) (POSS-PEG) with lithium tetrafluoroborate (LiBF4). NCPE has been characterized by DSC and impedance analyzer. POSS-PEG was highly compatible with PEO up to 50 wt% and resulted in single Tg and increased ionic conductivity. The ionic conductivity of the nanocomposites increased to 4.02 × 10−6 S/cm at POSS-PEG 50 wt% by more than 2 orders of magnitude. POSS-PEG nanoparticles sustainably increased ionic conductivity without impeding chain motion of polymer and were highly compatible with PEO up to POSS-PEG 50 wt%, which can mitigate the restriction of the amount of nanoparticles introduction. Also, the stable POSS core structure supplements the mechanical properties of polymer electrolytes. To understand ion transport behaviors, the segmental relaxation times (τs) of nanocomposites were studied by dielectric spectroscopy as function of POSS-PEG loading. τs decreased to −1.54 from −1.01 at POSS-PEG 5 ∼20 wt%, but it slightly increased to −1.28 from −1.54 at POSS-PEG 40 ∼ 50 wt%, which could be attributed to bridged complex formed between PEO and POSS-PEG through Li+.
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