4.7 Article

Remarkably enhanced energy-storage density and excellent thermal stability under low electric fields of (Na0.5Bi0.5)TiO3-based ceramics via composition optimization strategy

Journal

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 3, Pages 1917-1924

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.10.047

Keywords

Energy storage properties; Polar nanoregions; Thermal stability; Na1/2Bi1/2TiO3-based ceramics

Funding

  1. National Natural Science Foundation of China [51772242, 51621063]
  2. Fundamental Research Funds for the Central Universities [xjj2016017]
  3. 111 Project 2.0 [BP2018008]
  4. Innovative Research Team of Ministry of Education of China [IRT13034]

Ask authors/readers for more resources

By employing a composition-optimization approach, this study successfully achieved high energy density and high thermal stability in dielectric ceramics, making it a promising candidate for applications in miniaturized equipment.
High energy density and high thermal stability of energy-storage properties (ESP) under low electric fields are extremely crucial for the application of dielectric ceramics in miniaturized equipment. In present work, we use a composition-optimization approach to break the long-range ferroelectric order and modulate polar nanoregions (PNRs) in the local structure of (1-x)[0.7(Na0.5Bi0.5)TiO3-0.3(Sr0.7Bi0.2)TiO3]-xBi(Mg0.5Ti0.5)O-3 system. The large P-max value is maintained due to the existence of Bi ions in both the matrix and dopants. As a result, a high W-rec of 3.03 J/cm(3) together with a moderate. of 79.5 % was obtained in x = 0.05 sample at a low electric field of 200 kV/cm. Meanwhile, the high Wrec (2.41-2.52 J/cm(3)) and excellent thermal stability of ESP (Wrec varying less than 4.3 % and. > 90 %) from 50 degrees C to 200 degrees C at 150 kV/cm were also observed. The current system will be a promising candidate in energy-storage capacitor applications under low-fields and high-temperature.

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