The effect of the SiO2 coating layer and CCTO concentration mixed with PVDF has been studied. The polymer based composites of PVDF/SiO2/CCTO were made by a spin coating process, in which DMF was used as the solvent. The CCTO powders were coated by SiO2 using sol-gel method. The P-E loop test was conducted to measure the energy storage of different composites. The results show an increase in breakdown field while the P-E loop becomes slimmer by making a composite with SiO2. The polarization increased, due to enhancement in the dielectric constant of the composites because of a good connection between matrix and filler made by the additive. The microstructure was studied by using SEM pictures, which shows a better connection between fillers and matrix. The XRD has been used to illustrate the change in the crystallization. The improvement in both polarization and breakdown field make the composite suitable for energy storage usage.
Fig. 1. P-E loop of polymer composites
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