[en] Polymer electrolyte membranes (PEMs) are a class of materials that is receiving an increasing attention due to their applicability to a wide number of solid state devices and chemical processes. Proton (H⁺) and lithium ion (Li⁺) conducting membranes are of particular interest as both on increasing demand to prompt the commercialization of polymer electrolyte fuel cell and polymer electrolyte lithium battery. Radiation-induced grafting is a potential alternative method to prepare PEMs. During PEMs preparation, grafting reaction is often carried out using pre-irradiation method or simultaneous irradiation method (with γ-rays). However, reports on the use of simultaneous method with electron beam (EB) to prepare such membranes are very scarce. The objective of this work is to prepare and characterize two distinct polymer electrolyte membranes for possible use in fuel cell and lithium battery using single simultaneous radiation-induced grafting method with EB. Initially, styrene was impregnated into the porous structure of poly(vinylidene fluoride) (PVDF) films followed by simultaneous irradiation with EB using doses up to 50 kGy under N₂ and at room temperature. Subsequently, the obtained polystyrene pore filled PVDF films (membrane precursor) were functionalized using two different chemical treatments. The first treatment includes sulfonation with chlorosulfonic acid/1,1,2,2-tetrachloroethane mixture to obtain H⁺ conducting composite membranes. The second treatment involves activation of the polystyrene pore filled PVDF films with LiPF₆/EC/DC liquid electrolyte under to obtain Li⁺ conducting composite membranes. The micro-structure of both composite membranes was investigated using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The content of polystyrene grafted in the pores, water uptake, electrolyte uptake and ionic conductivity were measured. The obtained composite electrolyte membranes were found to achieve grafting yield up to 46% with superior Li⁺ conductivity values up to 1.9 10^-3 S/cm when treated with LiPH₆/EC/DC electrolyte solution and H⁺ conductivity of 5.95 x 10^-2 S/cm when sulfonated with 10% chlorosulfonic acid. The results of this work suggests that simultaneous radiation-induced grafting with EB offers a single versatile root to prepare two high quality composite polymer electrolyte membranes conducting H⁺ and Li⁺ for possible use in fuel cell and lithium batteries, respectively