Outstanding Energy-Storage Density Together with Efficiency of above 90% via Local Structure Design
Huajie Luo1, Zheng Sun1, Ji Zhang2
1Department of Physical Chemistry, Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Journal of the American Chemical Society
|December 18, 2023
Summary
Researchers developed advanced dielectric ceramic capacitors achieving record energy storage. This breakthrough offers high recoverable energy density and efficiency, crucial for next-generation electronic devices.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Dielectric ceramic capacitors are vital for electronic devices, but achieving high recoverable energy density (Wrec) and efficiency (η) simultaneously remains challenging.
- Bi0.25Na0.25Ba0.5TiO3 (BNT-50BT) exhibits large local polarization and structural distortion, making it a promising matrix material.
Purpose of the Study:
- To demonstrate the feasibility of developing dielectric ceramic capacitors with high Wrec and η.
- To investigate the relationship between local structure and energy storage performance.
Main Methods:
- Density functional theory (DFT) calculations.
- Local structure analysis at lattice and atomic scales.
- Chemical modification of BNT-50BT matrix.
Main Results:
- Achieved Wrec of 16.21 J/cm³ and η of 90.5% in Bi0.25Na0.25Ba0.5Ti0.92Hf0.08O3.
- This represents the highest Wrec for bulk ceramics with η > 90%.
- Disorderly polarization and small nanoregions (∼3 nm) contribute to low hysteresis and high efficiency.
Conclusions:
- Chemical design based on understanding local structure enables targeted regulation of high-performance energy storage systems.
- Drastic increase in local polarization under ultrahigh electric fields activates superior energy storage density.
- The study highlights a pathway for developing advanced dielectric ceramic capacitors.
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