Greatly enhanced discharged energy density and efficiency of BiFeO3-Based ceramics by regulating insulation performance. (October 2022)

• Record Type: Journal Article
• Authors: Zhao, Jinghao; Pan, Zhongbin; Tang, Luomeng; Shen, Yihao; Chen, Xiqi; Li, Huanhuan; Li, Peng; Zhang, Yong; Liu, Jinjun; Zhai, Jiwei
• Is Part Of: Materials today physics. Volume 27(2022)
• Publication Date: 2022-10
• Subjects: BiFeO3-Based -- Breakdown strength -- Relaxor ferroelectric -- Energy storage density; Materials science -- Periodicals; Physics -- Periodicals; Electronic journals; 530.41
• DOI: 10.1016/j.mtphys.2022.100821
• Languages: English
• ISSNs: 2542-5293

Abstract

Abstract: BiFeO3 (BFO) with excellent intrinsic polarization ( P s > 100 μC/cm 2 ) receives a great deal of attention for advanced lead-free ferroelectric materials. However, the low resistance and high leakage current density in its naturally seriously hinder the improvement of energy storage performances. Herein, we demonstrate that superb comprehensive performances of large discharged energy density ( W rec ∼ 6 J/cm 3 ) along with superior discharged efficiency ( η ∼ 90%), impressive frequency stability (1–500 Hz), fatigue resistance testing (1-10 5 cycles) and ultrafast discharged time ( t 0.9 –0.08 μs) could be attained in 0.3BiFeO3 -0.7(0.88BaTiO3 -0.12Bi(Li1/3 Hf2/3 )O3 [BFO-(BT-BLH)] relaxor ferroelectric ceramics. Remarkably improved breakdown strength ( E b ) of BFO-based solid solutions could be primarily contributed to the substitution of BT-BLH, which provides refined grain sizes, as well as increased bandgap, resistivity, and activation energy. The phase-field simulations further indicate that the refined grain sizes are beneficial to improving local electric field distribution and breakdown path, resulting in enhanced E b . The uncovered BFO-based ceramics design method provides a platform for high-performance capacitors development for extreme conditions. Graphical abstract: Image 1 Highlights: Excellent recoverable energy density ( W rec ∼ 6 J/cm 3 ) and discharged efficiency ( η ∼ 90%) are achieved. The 0.3BFO-0.7(BT-BLH) ceramics exhibit impressive frequency stability and fatigue resistance testing. The 0.3BFO-0.7(BT-BLH) ceramic shows a high power density (∼37.16 MW/cm 3 ) and a fast discharge time (∼0.08 μs).