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Effect of POSS-PEG on ionic conductivity and relaxation of solid polymer electrolytes
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DOI：10.1016/j.matpr.2020.10.947.png)
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Abstract
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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. POSSPEG 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 x 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 (ss) of nanocomposites were studied by dielectric spectroscopy as function of POSS-PEG loading. ss 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 ti 50 wt%, which could be attributed to bridged complex formed between PEO and POSS-PEG through Li+. (c) 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the National Conference on Functional Materials: Emerging Technologies and Applications in Materials Science.
Keywords:
Hybrid organic-inorganic nanoparticles
Nanocomposite polymer electrolytes
Dielectric spectroscopy
Ionic conductivity
Relaxation time
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