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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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AgNbO3-Based Multilayer Capacitors: Heterovalent-Ion-Substitution Engineering Achieves High Energy Storage
Ting Tang1, Dong Liu1, Qi Wang1
1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
ACS Applied Materials & Interfaces
|September 14, 2023
Summary
Researchers enhanced dielectric capacitors for advanced power devices by using heterovalent ion substitution and multilayer capacitor technology. This achieved high energy storage density and efficiency with zero remanent polarization and high breakdown strength.
Area of Science:
- Materials Science
- Electrical Engineering
- Solid State Physics
Background:
- Dielectric capacitors are crucial for advanced high-power devices.
- Current limitations include low energy storage density and efficiency due to high remanent polarization and low breakdown strength.
Purpose of the Study:
- To enhance energy storage capabilities of dielectric capacitors.
- To overcome limitations of remanent polarization and breakdown strength in AgNbO3 (AN) based capacitors.
Main Methods:
- Heterovalent ion substitution engineering (Sm³⁺ for Ag⁺).
- Multilayer capacitor (MLC) technology.
- Analysis of phase transitions and dielectric properties.
Main Results:
- Achieved large maximum polarization, zero remanent polarization, and high breakdown strength simultaneously.
- Sm³⁺ substitution induced an antiferroelectric (AFE) M₂ phase at room temperature.
- Obtained excellent energy-storage density (Urec ≈ 9.8 J·cm⁻³) and power density (P_D,max ≈ 34.8 MW·cm⁻³) in SmₓAN+Mn MLCCs (x=0.03).
Conclusions:
- Heterovalent ion substitution and MLCC technology offer a viable strategy for high-performance dielectric capacitors.
- The developed AFE MLCCs show significant potential for advanced energy storage applications.
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