A high dielectric composite for energy storage application

Piezoelectric composites are widely studied due to their good performances. Several kinds of these composites have been developed for sensing and actuation applications, however, most of them are not used for energy storage devices, because of their low dielectric properties. In this research work, a three-phase composite was developed. This latter was obtained by adding a small amount, up to 3%, of a (AL) to a piezoelectric composite. The Dielectric constant was found to be clearly increased with the increasing volume fraction of Aluminum. A comparison of piezo- and ferroelectric activities between different composites samples reveal a high improvement of the energy storage density, which reaches 11 J/cm2. In addition to that, it was found that the dielectric properties remain stable even at high temperature. For these reasons, this novel three-phase composite can be used for multifunctional embedded capacitors applications.