The main roles of the secondary battery separator are the active movement of lithium-ion through pores, prevention of physical contact between anode and cathode, and prevention of electrical isolation. The currently used separator is PE film. PE films have the advantage of being cheap, but they are weak at high temperatures. By the way, Polybenzimidazole is well known for its superior heat resistance and mechanical properties. Due to an excellent various property, PBI has been used in a lot of fields such as gas separation, OSN and secondary battery membrane. This work is focused on fabrication of Polybenzimidazole(PBI) using Electrospinning and modified the PBI membrane as hydrophilic using 4-(chloromethyl) benzoic acid(CMBA) and Sulfuric acid. The membrane was crosslinked by α,α’-Dibromo-p-xylene. To observe morphology, scanning electron microscope(SEM) was used and to check the hydrophilicity, contact angle test was performed. In case of separator properties, cycling test of those membranes was conducted.