Composite polymer electrolyte films comprising polyethylene oxide (PEO) as the polymer host, LiClO 4 as the dopant, and NiO nanoparticle as the inorganic filler was prepared by solution casting technique. NiO inorganic filler was synthesized via sol-gel method. The effect of NiO filler on the ionic conductivity, structure, and morphology of PEO-LiClO 4 -based composite polymer electrolyte was investigated by AC impedance spectroscopy, X-ray diffraction, and scanning electron microscopy, respectively. It was observed that the conductivity of the electrolyte increases with NiO concentration. The highest room temperature conductivity of the electrolyte was 7.4×10 −4 S cm −1 at 10 wt.% NiO. The observation on structure shows the highest conductivity appears in amorphous phase. This result has been supported by surface morphology analysis showing that the NiO filler are well distributed in the samples. As a conclusion, the addition of NiO nanofiller improves the conductivity of PEO-LiClO 4 composite polymer electrolyte.

The potential of hybrid polymer 49% poly(methyl methacrylate)-grafted natural rubber (MG49) and poly(methyl methacrylate) (PMMA) as a polymer host in solid polymer electrolyte film for rechargeable battery systems has been investigated. The hybrid films were prepared by the solution casting technique. The ionic conductivity was investigated by alternating current electrochemical impedance spectroscopy. The highest conductivity was 1.47 × 10−8 S cm−1 at 20 wt% of LiClO4. The observation on structural studies performed by x-ray diffraction showed that the crystallinity phase is reduced at the highest conductivity. Fourier transform infrared spectroscopy analysis showed that the interaction between lithium ion and oxygen atoms occurred at carbonyl (C=O) and ether (C–O–C) groups.

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Blend-based polymer electrolytes composed of PVDF-HFP/MG-49 (70/30) and LiClO4 as lithium salt has been studied. Solution casting method was applied to prepare the polymer electrolyte. Electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the electrolyte films. The maximum value of 2.51×10ˉ6 S cm-1 was obtained at ambient temperature for the 30 wt. % of LiClO4 and the conductivity increased to 1.10×10ˉ3 S cm-1 by increasing the temperature up to 383 K. FTIR spectra demonstrated that complexation occurred between the polymers and lithium salt.