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- W4381952976 abstract "This work reports the enhanced mobility of ions in ionic liquid (IL)-based gel polymer electrolytes (GPEs) with the incorporation of Al2O3 nanofibers. A combination of PVDF-HFP, EMIMTFSI and LiTFSI with 3 wt% Al2O3 nanofibers has been prepared through solution casting technique. The room temperature ionic conductivity of PVDF-HFP: ILs electrolyte (45:55, weight ratio of 0.82) (GPE) is found to be 2.7 × 10−5 S cm−1, which increases up to 7.8 × 10−5 S cm−1 in Al2O3 containing GPE (Al-GPE). Pulsed field gradient (PFG) NMR results validate the increased ionic conductivity observed in Al-GPE. We found that the diffusivity of Li+, TFSI− and EMIM+ increases when Al2O3 nanofibers are well-distributed in the GPE matrix. The surface morphology and the amorphicity of GPEs are examined through SEM and XRD analyses. Lastly, the local structure of Al2O3 fibers and the molecular-level interactions of ions with polymer, and their effect on the diffusivity of ions are established through solid-state NMR detecting 27Al, 1H, 13C, 19F nuclei including 2D 13C{1H} HETCOR NMR experiments. The 13C DPMAS and CPMAS experiments highlight the dynamic heterogeneity associated with the ions that are embedded in the rigid and the mobile phase of GPEs. While some of the ionic species strongly interact with polymer chains in the rigid environment, the majority of them reside in the mobile phase and contribute to the overall increased conductivity. Most importantly, Al2O3 nanofibers significantly affect the dynamics of ionic species that are present in the mobile phase between the polymer chains." @default.
- W4381952976 created "2023-06-26" @default.
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- W4381952976 date "2023-09-01" @default.
- W4381952976 modified "2023-10-14" @default.
- W4381952976 title "Structure and dynamics of ILs-based gel polymer electrolytes and its enhanced conductive properties with the incorporation of Al2O3 nanofibers" @default.
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- W4381952976 doi "https://doi.org/10.1016/j.electacta.2023.142765" @default.
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