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Harnessing Multisite High-Entropy Architecture for Ultrahigh Energy Storage Multilayer Capacitors
Zhen Liu1, Haonan Peng1,2, Teng Lu3
1Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Journal of the American Chemical Society
|October 29, 2025
Summary
Researchers developed a high-entropy relaxor ferroelectric multilayer capacitor using a flexible tetragonal tungsten bronze (TTB) architecture. This innovative lead-free dielectric capacitor achieves a record energy density of 20.2 J·cm⁻³, advancing miniaturization in electronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Ceramics Engineering
Background:
- Dielectric capacitors are crucial for modern electronics, but low energy storage limits device miniaturization.
- Lead-free dielectric materials are sought after for environmental and performance reasons.
- Relaxor ferroelectrics offer potential for high energy density but often face challenges with stability and efficiency.
Purpose of the Study:
- To develop a lead-free dielectric multilayer capacitor with enhanced energy storage capabilities.
- To explore the potential of high-entropy relaxor ferroelectric materials for advanced energy storage applications.
- To investigate the structure-property relationships in a novel tetragonal tungsten bronze (TTB) high-entropy architecture.
Main Methods:
- Fabrication of an equimolar high-entropy relaxor ferroelectric multilayer capacitor.
- Utilizing a flexible multisite tetragonal tungsten bronze (TTB) high-entropy architecture.
- Characterization of structural properties, including NbO6 octahedra distortion and local polar order.
- Measurement of energy storage density and efficiency under applied electric fields.
Main Results:
- The high-entropy design induced NbO6 octahedra distortion, disrupting long-range ferroelectric order while maintaining local polar axis displacements.
- The unique high-entropy TTB structure enhanced relaxor behavior, reduced hysteresis, and preserved high polarizability.
- Achieved an unprecedented recoverable energy density of 20.2 J·cm⁻³.
- Demonstrated a notably enhanced efficiency of 93.8%.
Conclusions:
- The developed equimolar high-entropy TTB multilayer capacitor exhibits exceptional energy storage performance.
- Designing flexible multisite high-entropy architectures is a promising strategy for developing advanced functional ceramics with high energy storage capabilities.
- This work paves the way for next-generation electronic devices requiring miniaturization and high energy density.
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