Akademik Veri Yönetim Sistemi
Journal of Materials Science: Materials in Electronics, cilt.37, sa.17, 2026 (SCI-Expanded, Scopus)
In this study, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based composite polymer electrolytes containing ionic liquid (IL) and TiSiO4 nanofiller are developed to determine the coupled effects of filler content, temperature and frequency on dielectric characteristics and ion transport. Membranes are prepared by the conventional solution-casting method and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy tests. The characterizations confirm strong IL-polymer interactions, reduced crystallinity, effective filler dispersion and sufficient thermal stability. AC conductivity (σac) measurements show that IL incorporation improves conductivity, while TiSiO4 further enhances the physical film properties. The TiSiO4 filler maintained ionic conductivity at comparable levels while modifying interfacial polarization behavior and the dielectric response of the composite electrolyte. At 430 K, the highest DC conductivities (σdc) are observed for the PVDF-HFP/IL and PVDF-HFP/IL/TiSiO4(1.5) composite membranes, reaching 8.03 × 10−4 and 6.86 × 10−4 S/m, respectively, which are nearly three orders of magnitude higher than that of pure PVDF-HFP (3.58 × 10−7 S/m). Dielectric analyses reveal pronounced low-frequency permittivity amplification, with the dielectric constant (ε′) reaching 1.51 × 104 at 20 Hz and 430 K for PVDF-HFP/IL/TiSiO4(2.0). Loss tangent (tan δ) profiles exhibit composition- and temperature-dependent relaxation behavior and indicate thermally-activated dipolar reorientation. Unlike conventional oxide fillers, TiSiO4 acts as an active interfacial component that modulates coupling between polarization dynamics and ion transport. The IL–TiSiO4 interaction optimizes conductivity and dielectric behavior, demonstrating promising potential for high-performance composite electrolytes.