Fabrication and electrochemical characterization of ion- conductive polymer electrolyte based on poly(vinylidene fluoride)/graphene oxide for Li-ion batteries

Poly(vinylidene fluoride) (PVDF) due to its desirable features such ashigh dielectric constant, high thermal stability has been considered as promising candidate for fabrication of polymer electrolytes in Li-ion batteries. Graphene oxide (GO) nanosheets were prepared via Hummers method and added to PVDF as nanofillers. FT-IR results revealed that the oxidization of graphite by strong oxidants led to the formation of oxygenated functionalities onto the graphite sheets. PVDF/GO polymer electrolytes were prepared by solution casting method. The effect of GO weight percentages (wt%) on the ionic conductivity of the prepared electrolytes was followed by electrochemical impedance spectroscopy (EIS).SEM analysis confirmed the uniform distribution of GO in polymer matrix and revealed that the porosity of polymer lectrolytes changed by altering GO wt%. PVDF/GO polymer electrolyte comprising of 0.004 wt% GO provided the highest ionic conductivity1.of6 mS/cm-1, which was about 45% higher than obtained for the pristine PVDF.

کلیدواژه ها:

Lithium ion battery ، polymer electrolytes ، poly(vinylidene fluoride) ، graphene oxid