Optimization the energy density and efficiency of BaTiO3-based ceramics for capacitor applications

By Di Hu, Z. Pan, X. Tan, Fan Yang, Jie Ding, Xiang Zhang, Peng Li, Jinjun Liu, J. Zhai, Hui Pan. 2020

139 citations recorded by the source corpus.

Abstract High-temperature lead-free dielectric ceramic capacitors are urgently needed in modern advanced power electronics systems. However, it is still a great challenge to realize both ultrahigh energy density (Wrec) and efficiency (η) under the harsh environment. In this work, the innovative 0.9(Sr0.7Bi0.2)TiO3-0.1Bi(Mg0.5Zr0.5)O3 (SBT-BMZ)-modified BaTiO3 (BT) relaxor ferroelectric ceramics are ingeniously designed and synthesized via a solid-state reaction route. Optimal energy storage performances are attained in 0.65BT-0.35(SBT-BMZ) ceramic with an excellent Wrec of 4.03 J/cm3, couple with an ultrahigh η of 96.2% at 370 kV/cm, which are superior to other lead-free BT-based ceramics. The energy storage performances of the 0.65BT-0.35(SBT-BMZ) ceramic also display superior thermal stability (20 ~ 180 °C) with a subtle change of Wrec (±8%) and η (±1%), frequency stability (1 ~ 500 Hz) and cycle stability (1 ~ 106 cycles) at 200 kV/cm. Moreover, the charge and discharge experiments indicate that the outstanding power density (PD ~ 62.6 MW/cm3) and ultrafast discharge time (t0.9 ~ 62 ns) are also achieved. All these features demonstrate that the 0.65BT-0.35(SBT-BMZ) ceramic is expected to be widely used in next-generation of wide-temperature dielectric capacitors.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d6fb1afefccda2881e411e44427fc5634ed310b4