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

Abstract

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 °C was achieved in novel 0.93Na0.5Bi0.5TiO3-0.07LiTaO3 (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/cm3, a high η of ~74.2% and a high Eb of 200 kV/cm. 0.9NBT-0.1LT ceramics also show a high pulse discharge energy density (WD) of 0.51 J/cm3, a large power density (PD) of 22 MW/cm3 and a rapid discharge duration of 100 ns over a wide temperature range of 30–150 °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.