Dielectric materials store and release electrical energy electrostatically through dielectric polarization and depolarization by the application and removal of an electric ield(as shown in Fig.1).As the only energy-storage device that is capable of delivering power density on the order of mega or even giga wats,electrostatic ca- Dielectric materials store and release electrical energy electrostatically through dielectric polarization and depolarization by the application and removal of an electric field (as shown in Fig. 1). As the only energy-storage device that is capable of delivering power density on the order of mega or even giga wats, electrostatic ca-