Improved energy storage performance of Ba0.4Sr0.6TiO3 by doping high polarization BiFeO3

Dielectric energy storage materials have a high power density, which has attracted much attention in many fields, such as pulsed power generation and electric vehicles etc. As a typical and traditional energy storage material, barium strontium titanate (Ba1-xSrxTiO3) has been widely used in this field. However, its energy storage density is extremely low. In this work, (1-x)Ba0.4Sr0.6TiO3-xBiFeO3 ceramics (x = 0.05, 0.10, 0.25) were prepared by the traditional solid-state method. The results show that the energy storage density of the 0.90Ba(0.4)Sr(0.6)TiO(3)-0.10BiFeO(3) ceramic with average grain size of 1.5 mu m is 3.1 J/cm(3), and the efficiency is 74.1% at a low electric field of 240 kV/cm. In addition, the energy storage density of the 0.95Ba(0.4)Sr(0.6)TiO(3)-0.05BiFeO(3) ceramic can be as high as 3.29 J/cm(3). The energy storage efficiency can reach 90.69% in the electric field of 300 kV/cm. It can be concluded that the addition of BiFeO3 can greatly enhance the energy storage property of Ba0.4Sr0.6TiO3, which indicates that Ba1-xSrxTiO3 ceramics with BiFeO3 will be good candidates in the field of power electronics.