4.7 Article

Enhancement of energy-storage properties in BiFeO3-based lead-free bulk ferroelectrics

Journal

CERAMICS INTERNATIONAL
Volume 48, Issue 12, Pages 16792-16799

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.02.229

Keywords

Solid state reaction method; Ferroelectric properties; Dielectric properties; Energy-storage performance

Funding

  1. Natural Science Foundation of China [51372042, 51872053]
  2. Guangdong Provincial Nat-ural Science Foundation [2015A030308004]
  3. NSFC-Guangdong Joint Fund [U1501246]
  4. Dongguan City Frontier Research Project [2019622101006]
  5. Advanced Energy Science and Technology Guangdong Provincial Laboratory Foshan Branch-Foshan Xianhu Laboratory Open Fund-Key Project [XHT2020-011]

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This study demonstrates the use of BZNO doping to enhance the energy storage density and efficiency of ceramic capacitors.
Dielectric capacitors with a high power density and fast charging/discharging rate are regarded as alternatives for energy storage applications. However, lower energy storage density and efficiency are critical issues that have to be addressed for applications as energy storage capacitors. (0.7-x)BiFeO3 - 0.3BaTiO3 - xBaZn1/3Nb2/3O3 + 0.1 wt%MnO2 (BFO-BTO-BZNO) ceramics were prepared via the conventional solid-state reaction approach. Both the temperature dependence of dielectric constant and slim P-E hysteresis loops confirm that (BFO-BTOBZNO) ceramics were relaxor ferroelectrics. Furthermore, the energy storage densities and efficiencies of (BFOBTO-BZNO) were calculated based on the hysteresis loops and direct measurements of the discharged pulse currents measured at room temperature. The results indicate that the doping of BZNO can adjust the maximum and remnant polarizations of BFO-BTO based bulk ceramics, thereby affecting the energy storage properties. And the maximum energy storage density obtained was 1.61 J/cm3 at 180 kV/cm and room temperature.

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