Energy storage properties of bismuth ferrite based ternary relaxor ferroelectric ceramics through a viscous polymer process

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-05, Vol.412, p.127555, Article 127555
• Main Authors: Liu, Gang, Tang, Mingyang, Hou, Xu, Guo, Biao, Lv, Jingwen, Dong, Jia, Wang, Ying, Li, Quan, Yu, Kun, Yan, Yan, Jin, Li
• Format: Article
• Language: English
• Subjects: Bismuth ferrite; Charge-discharge; Energy storage; Lead-free; Viscous polymer process
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.127555

•Sr0.7Bi0.2TiO3 can effectively modify the phase transition of BiFeO3-BaTiO3 from ferroelectric to relaxor.•Finite element method was used to analyze the local electrostatic behaviors under electric field.•The BDS of ceramic with 15SBT by VPP route increased to 330 kV/cm and Wrec reached 4.95 J/cm3.•15SBT (VPP) ceramics exhibit excellent Wdis of 2.36 J/cm3 within a short t0.9 of 134 ns. In this work, Sr0.7Bi0.2TiO3 (SBT) was doped into BF-BT to form a solid solution with relaxor ferroelectric characteristics. Constricted P-E loops were observed due to the field-induced phase transition and a significant reduction of grain size was found in the SBT-doped ceramics. Specially, 15%-SBT doped ceramics (15SBT) possessed the maximum recoverable energy storage (Wrec) of 2.01 J/cm3 and efficiency of 75%. Finite element method was used to analyze the local electrostatic behavior of ceramics under the electric field when the second phase exists. The simulation results indicate that the distributed second phase with moderate fraction has a positive effect on the enhancement of breakdown strength (BDS). More importantly, a viscous polymer process (VPP) route was employed to realize preparation optimization of the above composition. Much denser structure and higher BDS was successfully obtained in the 15SBT ceramic by VPP. The BDS of 15SBT ceramic by VPP has been dramatically increased from 180 to 330 kV/cm, and the Wrec has reached 4.95 J/cm3. Further charge-discharge tests of 15SBT ceramic by VPP also owns a high discharge energy of 2.36 J/cm3. The 15SBT ceramics prepared by VPP can be a potential candidate for high energy storage capacitors. Furthermore, the strategy raised in this study has been proved to be an effective way to achieve excellent energy storage capacity in lead-free ceramics.