| Autor: |
Li Y; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Lu G; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Zhao Y; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Zhao R; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Zhao J; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Hao J; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Bai W; College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China., Li P; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China., Li W; School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China. |
| Abstrakt: |
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 1/3 Nb 2/3 )O 3 (SZN)-modified (Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 TiO 3 (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 rec ) of 5.0 J/cm 3 with a conversion efficiency of 82% at 370 kV/cm, a practical discharged energy density (W d ) of 1.74 J/cm 3 at 230 kV/cm, a large power density (P D ) of 157.84 MW/cm 3 , and an ultrafast discharge speed (t 0.9 ) 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 4 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. |
