Issue 17, 2022

Superior energy storage performance in (Bi0.5Na0.5)TiO3-based lead-free relaxor ferroelectrics for dielectric capacitor application via multiscale optimization design

Abstract

Developing environmentally friendly lead-free dielectric ceramics with ultrahigh energy storage performance is fundamental to next-generation high-power capacitors but challenging as well. Herein, a record-breaking ultrahigh energy efficiency η of 97.8% and high energy density Wrec of 5.81 J cm−3 are simultaneously achieved in (Bi0.5Na0.5)TiO3 (BNT)-based relaxor ferroelectric ceramics by introducing linear dielectric CaTiO3 in order to synergistically manipulate the domain structure and microstructure evolution at the multiscale, generating the existence of stable and highly-dynamic polar nanoregions, fine grain size, suppressed leakage current density, and a large band gap Eg concurrently. More excitingly, the designed ceramic shows a remarkable thermal endurance (Wrec ≈ 3.7 ± 0.2 J cm−3, η ≈ 96% ± 3%, 30–160 °C), frequency stability (Wrec ≈ 3.9 ± 0.2 J cm−3, η ≈ 98% ± 2%, 5–200 Hz), cycling reliability (Wrec ≈ 3.5 ± 0.1 J cm−3, η ≈ 95% ± 2%, 1–105 cycles) at 350 kV cm−1, and superior discharge performance (power density PD ≈ 96.2 MW cm−3, discharge speed t0.9 ≈ 37.6 ns). This study explores high performance lead-free relaxor ferroelectrics for energy storage capacitors and offers an effective strategy to tailor the dielectric of relaxor ferroelectrics.

Graphical abstract: Superior energy storage performance in (Bi0.5Na0.5)TiO3-based lead-free relaxor ferroelectrics for dielectric capacitor application via multiscale optimization design

Supplementary files

Article information

Article type
Paper
Submitted
15 1 2022
Accepted
17 3 2022
First published
18 3 2022

J. Mater. Chem. A, 2022,10, 9535-9546

Superior energy storage performance in (Bi0.5Na0.5)TiO3-based lead-free relaxor ferroelectrics for dielectric capacitor application via multiscale optimization design

C. Li, J. Liu, W. Bai, S. Wu, P. Zheng, J. Zhang, Z. Pan and J. Zhai, J. Mater. Chem. A, 2022, 10, 9535 DOI: 10.1039/D2TA00380E

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