Structure, dielectric, and electrochemical studies on poly(vinylidene fluoride-co-hexafluoropropylene)/ionicliquid 1-ethyl-3-methylimidazolium tricyanomethanide-based polymer electrolytes

Solid polymer electrolyte films blended with ionic liquid 1-ethyl-3-methylimidazolium tricyanomethanide (EMImTCM) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) are prepared via solution cast technique. The physical characterization of polymeric film is performed by X-ray diffraction (XRD), polarized optical microscopy (POM), Fourier transform infrared spectroscopy (FTIR), and thermo-gravimetric analysis (TGA) studies. The gel electrolyte film with 300 wt% of IL shows the high ionic conductivity value of 3.7 × 10${}^{-2}$ S cm${}^{-1}$, and operating voltage from -0.5 to 1.5 V, i.e., electrochemical stability window (ESW) ≈ 2.0 V. The dielectric properties of the polymeric films such as dielectric constant, dielectric loss tangent (Tan δ), relaxation frequency, and time are evaluated. (© 2022 Wiley‐VCH GmbH)