Enhanced energy storage performance of PVDF composite films with a small content of BaTiO3

Polymer-based 0–3 composites filled with ceramic particles are identified as ideal materials for energy storage capacitors in electric systems. Herein, PVDF composite films filled with a small content (< 10 wt%) of BaTiO3 (BT) were fabricated using simple solution cast method. The effect of BT content on the discharged energy density (Udischarged) of the composite films was studied systematically. The sample with 3 wt% BT exhibits the highest breakdown strength (Eb) of 525 MV/m and a highest Udischarged of 18.12 J/cm3. The distribution of local electric field and local polarization of composite films were simulated by COMSOL Multiphysics. This work offered a viable reference to prepare high energy storage density capacitor at small filler loading.