Development of Membranes Based on Polyvinylidene Fluoride for Lithium Batteries

Two methods for producing lithium-conductive polymer films based on polyvinylidene fluoride (PVDF) were studied: saturating a dielectric PVDF film with a lithium-conductive solution and incorporating a lithium-conductive solution into a PVDF solution, followed by the fabrication of a lithium-conductive film. A comprehensive set of electrophysical studies on the properties of the proposed gel-polymer electrolyte across a wide temperature range (20–70 ℃) and frequency range (0.1 Hz–32 MHz) was conducted. Li-ion battery prototypes constructed using the engineered membrane exhibit improved performance and enhanced stability during charge/discharge cycling compared to cells with a commercial Celgard 2400 separator.