Exploring effectiveness of LiTFSI concentration, different anionic salts, and BaTiO3 and ZnO nanofillers on the promising properties of P(VDF-HFP)/PEO matrix based multifunctional solid polymer electrolytes

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Development of high-performance hybrid energy devices, numerous types of sensors, and advances in wearable electronics, promising properties multifunctional solid polymer electrolytes (SPEs) and nanocomposite-SPEs (NSPEs) are established as crucial flexible materials. In this context of electrolyte materials, three sets of SPE and NSPE films are rationally prepared considering a 50/50 wt% poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP))/poly(ethylene oxide) (PEO) blend as host matrix with adding varying concentrations of LiTFSI salt (25, 35, and 45 wt%), different anionic lithium salts (LiTFSI, LiClO 4 , and LiCF 3 SO 3 for their 35 wt%), and wide bandgap semiconductor nanomaterials (BaTiO 3 and ZnO each of 5 wt% with 35 wt% LiTFSI). Prominent properties of these solution cast prepared solid ion-dipole complexes are characterized in-detail by recording differential thermograms, XRD traces, SEM micrographs, and FTIR, UV-Vis absorbance, dielectric, and electrical spectra, and also carrying out important electrochemical measurements. All these electrolytes of different compositions are predominantly amorphous having diverse phase structures, and they exhibited dual energy bandgaps in the range of 2.75 – 5.07 eV, considerable photo sensing and UV resistance owing to dispersed oxide nanoparticles, high interfacial polarization and dipolar ordering with appreciable faster ions coupled chain segmental dynamics. At room temperature, these materials have high dielectric permittivity (∼ 10 3 to 10 4 order around 100 Hz), dc ionic conductivity in the range 1.6 × 10 -6 – 7.6 × 10 -5 S/cm which mainly ruled by ions coupled chain segmental dynamics, total ion transference number 0.84 – 0.99, and ESW of 5.7 – 6.3 V, with a good charge/discharge cyclability and reproducibility performance. These promising experimental parameters establish the prepared electrolytes as multifunctional materials and expanding their scope in the fabrication of supercapacitors, high density lithium-ion rechargeable batteries, and a variety of ion conducting optoelectronic devices, and also the next generation integrated type hybrid opto-mechanical energy devices.