Fig. 4 exhibits the polarization-electric field hysteresis loops of the BLTx ceramics before dielectric breakdown. The samples possess typical ferroelectrics polarization-electric field hysteresis loops and grow slimmer with x increasing. This phenomenon can be ascribed to the destruction of long-range ordered ferroelectric domains and the formation of smaller sized polar nano-regions, deriving from the different atomic radius between Li+ and Ba2+. The corresponding domains are easily to align and back-switch during the polarization process [21]. According to energy-storage density formula: