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Updated: Aug 6, 2026
06:34
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Synergistic Relaxor Engineering and Microstructural Densification Enable Ultrahigh Energy Storage in BNT-Based
Yang Zhao1, Yu Wu1, Fukang Chen1
1Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 5, 2026
Summary
Researchers developed lead-free dielectric ceramics for energy storage. By combining relaxor properties with dense microstructures, they achieved high energy density and efficiency, overcoming previous limitations in dielectric materials.
Area of Science:
- Materials Science
- Solid State Physics
- Ceramics Engineering
Background:
- Lead-free dielectric ceramics are crucial for pulsed-power capacitors.
- Existing materials face trade-offs between energy density, efficiency, and breakdown strength.
- Developing materials with high recoverable energy density and efficiency is a key challenge.
Purpose of the Study:
- To develop lead-free dielectric ceramics with enhanced energy storage capabilities.
- To overcome the limitations of polarization strength, hysteresis loss, and breakdown strength.
- To investigate the synergistic effects of relaxor regulation and microstructural densification.
Main Methods:
- Synthesized (0.94-x)(Bi0.5Na0.5)TiO3-0.06KNbO3-xSrTiO3 [(0.94-x)BNT-0.06KN-xST] ceramics.
- Incorporated KNbO3 (KN) to induce relaxor behavior.
- Added SrTiO3 (ST) to enhance structural heterogeneity and polar nanoregions.
- Utilized tape casting for microstructural densification.
Main Results:
- Optimized composition (x=0.32) showed a breakdown strength of 804 kV/cm.
- Achieved ultrahigh recoverable energy density of 10.1 J/cm³.
- Demonstrated high energy storage efficiency of 97.6% at 820 kV/cm.
- Observed robust energy storage performance under varying frequency and temperature.
Conclusions:
- A multiscale synergistic strategy combining relaxor engineering and microstructural densification is effective.
- This approach reconciles polarization reversibility and electric-field endurance in lead-free dielectrics.
- The developed ceramics show great promise for advanced pulsed-power capacitor applications.
