A separator is one of the main components of lithium-ion batteries. It separates the cathode and anode while allowing the exchange of ions, and reduces the risk of a short circuit that can cause battery failure. In this study, membranes consisting of electrospun, SiO2-containing, poly(vinylidene fluoride) nanofibers were synthesized for use as separators in lithium-ion batteries. Moreover, this study investigated the effect of the volume of colloidal SiO2 (1, 2, and 3 mL) in the precursor (a PVDF/SiO2 solution containing 10 mL of PVDF solution) on the properties of an associated nanofiber membrane and its performance in a coin cell battery. It was found that the porosity, mechanical strength, and thermal resistance of PVDF/SiO2 nanofiber membranes increase with the increasing volume of colloidal SiO2 in the precursor. The PVDF/SiO2 precursor containing 3 mL SiO2 produces an optimal membrane separator with a porosity of 67%, thermal shrinkage ratio of 1.3%, and elongation at break of 24%. These results show that PVDF/SiO2 separators have higher porosity rates than pp and PE membrane separators. Furthermore, the corresponding coin cell battery achieves the highest charge and discharge capacities, i.e., 2.36 and 1.36 mAh/g, respectively.
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/SiO2 (Polyvinylidene fluoride/Silica) nanofiber membrane was synthesized by double jet sprayers electrospinning method on rotating cylinder collector. The SiO2 colloid nanoparticle concentration was varied at 1000, 2500, and 5000 ppm. The effect of the SiO2 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/SiO2 results have a fibrous structure with SiO2 adhering to the fibers' surface. The membrane separator's average thickness is 10.2 micrometers. A large amount of SiO2 addition (SiO2 5000 ppm) on the PVDF nanofibers membrane increased porosity, mechanical properties, and stability at a temperature of 150 °C.
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