Synergistic optimization of barium titanate-based ferroelectrics for enhanced energy storage performance

• Published in: Journal of alloys and compounds Vol. 1006; p. 176372
• Main Authors: Huang, Yunyao, Yang, Yule, Zhang, Leiyang, Laletin, Vladimir, Shur, Vladimir, Jing, Ruiyi, Jin, Li
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.11.2024
• Subjects: BaTiO3; Dielectric capacitors; Energy storage performance; Relaxor ferroelectric; Synergistic optimization; Viscous polymer process; Synergistic optimization; Dielectric capacitors; Relaxor ferroelectric; Viscous polymer process; Energy storage performance; BaTiO3
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.176372

Barium titanate (BT) ferroelectric materials have garnered significant interest in pulse dielectric capacitor devices due to their remarkable chemical stability and exceptional electrical performance. However, their inferior energy-storage performance (ESP), characterized by inadequate breakdown strength and high energy storage loss, has hindered their further advancement in applications. To address this challenge, we adopt a synergistic optimization strategy combining composition design with chemical substitution and microstructure engineering through the viscous polymer process (VPP) to develop an eco-friendly system, denoted as (1–x)[0.65BaTiO3-0.35(Sr0.7Bi0.2)TiO3]-xBi(Mg2/3Nb1/3)O3 (abbreviated as BS-xBMN). This deliberate modification enhances polarization by leveraging the hybridization of the 6 s orbitals of Bi3+ ions with the 2p orbitals of O2− ions. By adjusting the BMN content to regulate relaxor ferroelectric characteristics and field-induced polarization, we promote the formation of polar nanoregions and microstructural heterogeneity, ultimately enhancing ESP and improving the thermal stability of the materials. In the BS-0.05BMN ceramics fabricated by the VPP, we simultaneously achieve a large recoverable ES density of 5.29 J/cm3 and a prime energy storage efficiency of 95.3% under the E-field of 520 kV/cm, along with reliable temperature applicability within 30−150 °C. These results highlight the potential of BT-based materials for energy storage and provide guidance for future research endeavors. •Synergistic optimization boosts BT capacitor materials, overcoming energy-storage limitations.•Novel BS-xBMN eco-friendly system enhances polarization and microstructure for superior ESP.•VPP fabrication of BS-0.05BMN ceramics yields high energy density and efficiency.•Enhanced thermal stability expands BT-based ceramics' applicability in energy storage.