A lead free relaxation and high energy storage efficiency ceramics for energy storage applications

In the present work, ternary solid solution ceramics of the (1-x)SrTiO3-x(0.65BaTiO3-0.35Bi0.5Na0.5TiO3) (STB100x) were designed and fabricated using a conventional solid-state sintering method. The phase structure, microstructure, dielectric property, relaxation property, ferroelectric property and energy storage property were systematically investigated. The addition of 0.65BaTiO3-0.35Bi0.5Na0.5TiO3 (BT-BNT) could enhance the saturated polarization of the ceramics obviously. All the samples show a slim P-E hysteresis loop, and the sample with x = 0.3 exhibits a high energy storage density of 1.40 J/cm3 and an energy storage efficiency more than 90%. These results indicate that the STB100x ceramics may be a promising lead free materials for high energy storage density capacitors.