Analytical and Bioanalytical Electrochemistry is an international scientific journal, which is published online every 3 months (since 2009), every 2 months (since 2011) and monthly (since 2018) by Center of Excellence in Electrochemistry, University of Tehran Analytical and Bioanalytical Electrochemistry - 14 2 2022 02 28 PE/PET Li-ion Battery Separator: Preparation by Wet Method and Electrospinning and its comparison with Industrial PP Separator 160 178 249816 EN Ramin Badrnezhad Department of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology, Tehran,P.O. Box 15875-1774, Iran Abolfazl Fathollahi Zonouz Organic Polymer Chemistry Research Laboratory, Department of Chemistry, University of Isfahan, Isfahan, Iran Hamed Pourfarzad Center of Excellence in Electrochemistry, University of Tehran, Tehran, Iran Journal Article 2021 08 02 Lithium-ion batteries (LIB) have attracted enormous attention in the past decades due to their outstanding features, such as high energy density, long cycle life, low self-discharging capacity. Although Lithium-ion batteries have been an energy storage system for commercial electronics, issues regarding its safety raised doubt about its usage for energy storage. This paper presents a bilayer Li-ion battery separator produced by the wet method for its Polyethylene (PE) base layer, which has been reinforced by a nonwoven polyethylene terephthalate layer by electrospinning. This separator has appropriate porous morphology, 41% porosity, BET specific surface area of 39.3 m²/gr, an average pore diameter of 22 nm, electrolyte uptake of 216%, a tensile strength of 100 MPa, the ionic conductivity of 0.451 mS/cm, Excellent electrochemical stability up to 4.6 volts, acceptable cyclic performance and charge and discharge capacity which provides the expected characteristics of a suitable separator and, above all, due to the presence of a layer PET provides a shutdown safety window of about 100 degrees Celsius by improving its dimensional stability under high temperatures. https://www.abechem.com/article_249816_debd527f06d7976f00ed571bf58fa209.pdf