Novel Na0.5Bi0.5TiO3 based, lead-free energy storage ceramics with high power and energy density and excellent high-temperature stability

Superior high-temperature stable dielectric ceramics with high energy density and power density are promising materials for the pulse power capacitor applications. A high dielectric constant of 1568 +/- 15% at an ultra-wide temperature range of 60-600 degrees C was achieved in novel 0.93Na(0.5)Bi(0.5)TiO(3)-0.07LiTaO(3) (0.93NBT-0.07LT) lead-free ceramics via LiTaO3 modification and composition engineering. Furthermore, 0.9NBT-0.1LT ceramics possess a high energy storage density of 3.1 J/cm(3), a high eta of -74.2% and a high Eb of 200 kV/cm. 0.9NBT-0.1LT ceramics also show a high pulse discharge energy density (W-D) of 0.51 J/cm(3), a large power density (P-D) of 22 MW/cm(3) and a rapid discharge duration of 100 ns over a wide temperature range of 30-150 degrees C, which is suitable for the pulse power applications. Compared with other lead-free ceramics reported so far, a significant difference is that the high energy density and power density are achieved in 0.9NBT-0.1LT ceramic simultaneously. This study provides an original strategy for high temperature stable ceramics in pulse capacitor applications.