The Physicochemical Properties of PVDF/SiO₂ Composite Nanofibers for Potential Application of Lithium-Ion Battery Separators

Lithium-ion batteries have the main component include a positive electrode, negative electrode, liquid electrolyte, and membrane separator. The separator was used to secure the battery by preventing it from short circuits. In this paper, the separator PVDF/SiO 2 (Polyvinylidene fluoride/Silica) nanofiber membrane was synthesized by double jet sprayers electrospinning method on rotating cylinder collector. The SiO 2 colloid nanoparticle concentration was varied at 1000, 2500, and 5000 ppm. The effect of the SiO 2 nanoparticle addition to the PVDF nanofiber membrane to improve membrane characteristics, including porosity, high temperature stability mechanical, mechanical strength, and battery capacity stability, were systematically investigated. The PVDF/SiO 2 results have a fibrous structure with SiO 2 adhering to the fibers' surface. The membrane separator's average thickness is 10.2 micrometers. A large amount of SiO 2 addition (SiO 2 5000 ppm) on the PVDF nanofibers membrane increased porosity, mechanical properties, and stability at a temperature of 150 °C.