Abstract
The utilization of conductive polymer-matrix composites (CPCs) with a high concentration of filler as an overcurrent protection device can reduce operational load and improves circuit stability. However, limitations such as reduced positive temperature coefficient (PTC) intensity and inferior voltage breakdown strength hinder its development. To overcome this, the study investigates the integration of graphite fluoride into carbon black (CB)/Poly (vinylidene fluoride) (PVDF) composites. The graphite fluoride-doped CPCs demonstrate outstanding voltage resistance, PTC intensity, and electrical properties, which can be ascribed to the heightened compatibility and adhesion between CB and PVDF, resulting in diminished migration and agglomeration of conductive fillers during current shock and thermal conditions. Graphite fluoride also acts as a shield, counteracting the negative effects of electrical, chemical, and thermal breakdown failures, thus inhibiting PVDF degradation during current impact. Overall, this approach significantly enhances the voltage withstand capability of overcurrent protection devices under current saturation conditions.
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