Polyvinylidene Fluoride/Zinc Oxide (PVDF/ZnO) nanocomposite membranes electrolytes were prepared via non-solvent induced phase separation (NIPS) method. used N,N-dimethyl acetamide (DMAc) as a solvent to dissolve the polymer (PVDF) so that different concentrations (–0, 4,5,6, 7and 8 wt. %) of polyvinylpyrrolidone (PVP) as pore-forming agents. and zinc oxide (ZnO) as filler. The as-prepared membranes were immersed in a coagulating bath containing a non-solvent (water) to complete the membrane pore structure. Scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectroscopy were used to characterize the structure and morphology of the membranes. Both the uptake of electrolyte and ionic conductivity of the membranes gel polymer electrolytes (GPEs) were increased with increases in the PVP content. The highest conductivity at room temperature for GPEs is found to be 5.64 mS cm-1. Additionally, the membrane’s crystallinity (11.9 %) proved to be less than pure PVDF (37.26%), and a decrease in the crystallinity was detected with increases in the addition of PVP. A LiFePO4 cathode was used to examine the performance of the GPEs in battery lithium-ion, and this discharge capacity of the gel-type composite membrane could be enhanced from 96.99 (PVDF) to 125.845 mA H g-1 (modified PVDF with ZnO and PVP) . The results suggest that this membranes gel electrolytes exhibited good feasibility to be used in large-capacity lithium-ion batteries that require high safety.
Keywords: PVDF; Polymer Gel Electrolytes; ZnO; PVP