CHARACTERISTICS TEST OF POLYPROPYLENE MEMBRANE AS A CR2016 TYPE LITHIUM-ION COIN CELL BATTERY SEPARATOR

Abstract

The separator is a porous membrane and is the most important part of a lithium-ion battery. One viable alternative material used as the membrane is polypropylene (PP). This membrane has the advantages of being available in various sizes, well-controlled porosity, thermally and chemically stable, as well as low cost. Therefore, this study aims to determine the characteristics of the polypropylene membrane including the wettability value using a contact angle goniometer, surface morphology using SEM (Scanning Electron Microscopy), thermal properties using a thermogravimetric analyzer and thickness using a digital screw micrometer. The study was firstly conducted by preparing a PP membrane and the characteristics were then tested. The results showed that the contact angle was <90° indicating that the wetting value is good because of the fact that various membrane surfaces are wetted. The SEM test then indicated a homogeneous pore-shaped morphology. Furthermore, the differential scanning calorimetry (DSC) and the thermogravimetric analysis (TGA) tests showed that the PP membrane is capable of withstanding high temperatures up to 139°C, while the thickness test showed a value <25 m.