Energy‐storage properties of (0.7Bi0.65Na0.35Fe0.3Ti0.7O3–0.3Sr0.85Bi0.1TiO3)–NaTaO3 relaxor under low electric fields

Abstract

AbstractCurrently, the energy‐storage properties of dielectric ceramic capacitors have aroused wide attention; however, most materials exhibiting excellent energy‐storage properties are based on high electric fields, which increase the cost of insulation technology. Herein, the energy‐storage and charge–discharge properties of (1 − x)(0.7Bi0.65Na0.35Fe0.3Ti0.7O3–0.3Sr0.85Bi0.1TiO3)–xNaTaO3 (x = 0.03–0.18, abbreviated as 100xNT) ceramics are investigated. 9NT achieves superior energy‐storage properties under a low electric field of 210 kV/cm, with an energy‐storage density (Wrec) of 3.44 J/cm3 and efficiency (η) of 86.6%. The energy‐storage properties exhibit excellent frequency stability in 3–100 Hz as well as temperature stability between 25 and 175°C. Furthermore, the charge–discharge performance features a high‐power density (PD = 67.04 MW/cm3), and an ultrafast discharge speed (t0.9 = 52 ns). This work paves a new way to explore energy‐storage competitive materials under low electric fields.