Polymer blend electrolytes composed of poly(vinylidene fluoride-co-hexafluoro-propylene) (PVDF-co-HFP), poly(methyl methacrylate) (PMMA) and 1•0 M magnesium trifluoromethanesulfonate (MgTf3) as salt have been synthesized using solution caste technique by varying the PMMA@PVDF-co-HFP/Mg2+ blend concentration ratio systematically. However, Mg2+ ions interaction with electrode materials and electrolyte molecules results in slow Mg2+ dissociation and diffusion, which in turn leads to inadequate power density and cycle stability. X-ray diffraction (XRD), FTIR, scanning electron microscopy (SEM), Differential scanning calorimetry (DSC), complex impedance spectroscopy, linear sweep voltammetry, AC and DC ionic conductivity studies were used to examine the impact of compositional modification of PMMA in the composite gel polymer electrolyte system. The PVDF-co-HFP/Mg2+ and PMMA@PVDF-co-HFP /Mg2+ mix-based solid polymer electrolyte membrane provides optimal ionic conductivity of 8.014×10-6 and 5.612×10-5 at ambient temperature, and the ionic conductivity of the system rises with increasing PMMA content. Scanning electron microscopy and x-ray diffraction analyses validate the improved ionic conductivity. Electrical conductivity was measured using electrochemical impedance spectroscopy at temperatures ranging from 303 to 363 K. Changes in temperature and PMMA concentration cause an increase in ionic conductivity. Loss tangent and imaginary part of modulus (M"), which relate to dielectric and conductivity relaxation, respectively, demonstrate a quicker relaxation process as PMMA concentration increases up to an optimal value. The modulus (M") demonstrates that the conductivity relaxation is not of the Debye type (broader than the Debye peak).

In this particular study, porous structured solid PVDF-co-HFP: MgTf3 polymer electrolytic membranes are made by using the solution cast method. PVDF-co-HFP is a material that has outstanding performance and has been extensively used in the preparation of solid polymer electrolyte membranes (SPEM). The use of SPEM with high porosity structure has the potential to increase the conductivity, which may result in enormous applications in the development of future batteries. The addition of the inorganic salt particles (Magnesium trifluoromethanesulfonate (MgTf3)) and coating of the SPEM with a variety of polymer media for the manufacture of storage devices are just two of the many methods that have been tried in an effort to decrease the pore size and the number of pores in the SPEM. The current research was successful in decreasing pores’ size and increasing the amorphous nature of the solid polymer membrane with the addition of the metal salt particles as an inorganic filler. The chemical structure of the prepared SPEM was investigated using Fourier transform infrared spectroscopy (FTIR), and a scanning electron microscope (SEM) was utilized to explore the surface morphology and to find pores in the SPEM. X-ray diffraction (XRD) analysis was used to confirm the surface morphology of the PVDF-co-HFP membrane and the PVDF-co-HFP-MgTf3. A differential scanning calorimetry (DSC) investigation was carried out the determining the electrochemical consistency of the PVDF-coHFP and PVDF-co-HFP: MgTf3 membranes. According to the research, inorganic salt particles can make PVDF-coHFP: MgTf3 membranes less porous, increase the conductivity of ions and make the membrane more stable when it is filled with electrolytes and electrodes.