Relaxor Ferroelectric Polymer-ceramic Composites for High Energy Density Capacitor Applications

Abstract

Pulsed power systems such as electromagnetic and electrothermal guns, directed energy weapons, electromagnetic armor require high energy density capacitors. Energy density of capacitor is determined by the dielectric constant and dielectric breakdown strength. Both to increase the dielectric constant of polymer matrix and to increase the breakdown strength of ceramics, we investigated the relaxor ferroelectric polymer-ceramic composites for energy storage capacitors. Composites have larger dielectric constant than pure polymer. However, breakdown strength becomes lower than pure polymer. With the antiferroelectric ceramic-polymer composites, we can obtain the energy density 3.52 J/cc at a 100 V/um electric field.