Boosting energy storage performance of BiFeO3-based multilayer capacitors via enhancing ionic bonding and relaxor behavior

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 10; no. 13; pp. 7382 - 7390
• Main Authors: Li-Feng, Zhu, Song, Aizhen, Bo-Ping, Zhang, Xiao-Qi, Gao, Zhi-Hang Shan, Gao-Lei, Zhao, Yuan, Junqi, Deng, Deng, Shu, Hailong, Jing-Feng, Li
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 30.03.2022
• Subjects: Capacitors; ceramics; Chemical bonds; chemistry; dielectric permittivity; Dielectric relaxation; electric field; Electric fields; Electronic systems; energy; Energy storage; Manganese dioxide; Multilayers; Power conditioning; Relaxors
• ISSN: 2050-7488; 2050-7496; 2050-7496
• DOI: 10.1039/d1ta10971e

Environmentally friendly BiFeO3 capacitors have great potential for applications in pulsed-discharge and power conditioning electronic systems because of their excellent intensity of spontaneous polarization (Ps). Herein, (0.7−x)BiFeO3-0.3BaTiO3-xNaTaO3 + 0.3 wt% MnO2 (abbreviated as BF-BT-xNT) multilayer ceramic capacitors (MLCCs) were designed and prepared to improve the energy storage performance via enhancing ion bonding and dielectric relaxation. The BDS of BF-BT-xNT MLCCs from 500 kV cm−1 at x = 0.05 increases greatly to 800 kV cm−1 at x = 0.15 due to the increase of the band gap and resistance, and the decrease of dielectric permittivity. An excellent energy storage density Urec = 9.1 J cm−3 and efficiency η > 80% were obtained since ultrahigh BDS (780 kV cm−1) and low Pr value (2.1 μC cm−2 at measured electric field 780 kV cm−1) were achieved simultaneously in BF-BT-xNT multilayer capacitors at x = 0.12. This work provides a strategy for improving energy storage properties of BiFeO3, which is via enhancing ionic bonding and relaxor behavior to achieve high BDS, low Pr and large Pmax, simultaneously.