Ferroelectric and Relaxor-Ferroelectric Phases Coexisting Boosts Energy Storage Performance in (Bi<sub>0.5</sub>Na<sub>0.5</sub>)TiO<sub>3</sub>-Based Ceramics
oleh: Yunting Li, Guangrui Lu, Yan Zhao, Rui Zhao, Jiaqi Zhao, Jigong Hao, Wangfeng Bai, Peng Li, Wei Li
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2024-07-01 |
Deskripsi
With the intensification of the energy crisis, it is urgent to vigorously develop new environment-friendly energy storage materials. In this work, coexisting ferroelectric and relaxor-ferroelectric phases at a nanoscale were constructed in Sr(Zn<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub> (SZN)-modified (Bi<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.94</sub>Ba<sub>0.06</sub>TiO<sub>3</sub> (BNBT) ceramics, simultaneously contributing to large polarization and breakdown electric field and giving rise to a superior energy storage performance. Herein, a high recoverable energy density (W<sub>rec</sub>) of 5.0 J/cm<sup>3</sup> with a conversion efficiency of 82% at 370 kV/cm, a practical discharged energy density (W<sub>d</sub>) of 1.74 J/cm<sup>3</sup> at 230 kV/cm, a large power density (P<sub>D</sub>) of 157.84 MW/cm<sup>3</sup>, and an ultrafast discharge speed (t<sub>0.9</sub>) of 40 ns were achieved in the 0.85BNBT-0.15SZN ceramics characterized by the coexistence of a rhombohedral-tetragonal phase (ferroelectric state) and a pseudo-cubic phase (relaxor-ferroelectric state). Furthermore, the 0.85BNBT-0.15SZN ceramics also exhibited excellent temperature stability (25–120 °C) and cycling stability (10<sup>4</sup> cycles) of their energy storage properties. These results demonstrate the great application potential of 0.85BNBT-0.15SZN ceramics in capacitive pulse energy storage devices.