A novel lead-free Na0.5Bi0.5TiO3-based ceramic with superior comprehensive energy storage and discharge properties for dielectric capacitor applications
Da Li, Ying Lin, Qibin Yuan, Miao Zhang, Liang Ma, Haibo Yang
Abstract
Na0.5Bi0.5TiO3 (NBT)-based ceramics have been widely used as dielectric materials for energy storage capacitors because of their environmental friendliness and excellent ferroelectric properties. However, their energy storage performance still needs to be further improved to satisfy the increasing demand. Herein, we report a novel 0.90(Na0.5Bi0.5)0.7Sr0.3TiO3-0.10Bi(Ni0.5Sn0.5)O3 (0.90NBST-0.10BNS) ceramic with significantly improved energy density (5.0 J cm−3), enhanced recoverable energy density (4.18 J cm−3) and high energy efficiency (83.64%) through the incorporation of Bi(Ni0.5Sn0.5)O3 (BNS), due to the increased breakdown strength and the relaxation ferroelectric (RFE) properties. The first-order reversal curve (FORC) measurements confirm that the addition of BNS improves RFE properties by breaking the order of long-range ferroelectricity. The 0.90NBST-0.10BNS ceramic also possesses an outstanding temperature and frequency stability of energy storage properties in the range of 20 °C–140 °C and 1 Hz–100 Hz, respectively. More importantly, the discharge properties characterized by a preeminent power density (36.19 MW cm−3), transient energy release times (144.2 ns), and high discharge energy density (1.16 J cm−3) also synchronously observed in 0.90NBST-0.10BNS ceramic. These results show that the 0.90NBST-0.10BNS ceramic with outstanding comprehensive performances is a promising energy storage ceramic candidate for capacitors in high power systems.