Fabrication of PVDF/SiO2 Nanofiber Membrane as A Separator of Li-ion Battery by Double Jet Sprayers Electrospinning Method

Abstract

The temperature of the lithium-ion battery while running the electric vehicle becomes a severe safety issue. One way to keep the battery work at high temperatures is by a modified battery separator. The separator was used as a component to secure the battery by preventing short circuit current between the electrodes of opposite polarity. This current research reported the high-temperature shrinkage and excellent mechanical strength membrane separator based on PVDF/SiO2 nanofiber produced by double jet sprayers electrospinning method on rotating cylinder collectors. The independent variable in this research was the variation of a SiO2 polymer at 0 ppm, 500 ppm, 1000 ppm, and 3000 ppm. The results of PVDF/SiO2 nanofiber formed have beaded fiber structure with the average size of fiber’s diameter of ~192 nm. The highest amount of SiO2 addition (SiO2 3000 ppm) on PVDF nanofiber’s membrane causes an increase of porosity up to 69%. The addition of SiO2 also strengthens its mechanical and thermal shrinkage properties to 150°C. In the testing of the charge-discharge battery using separator PVDF/SiO2 nanofiber, the specific capacity value is 181 mAh/g.