High-entropy engineered BaTiO₃-based ceramic capacitors with greatly enhanced high-temperature energy storage...

Area of Science:

• Materials Science
• Ceramic Engineering
• Dielectric Materials

Background:

• Ceramic capacitors are vital for electrical applications but limited by low energy density, especially at high temperatures.
• Improving energy density and high-temperature performance is key for device miniaturization and broader application.

Purpose of the Study:

• To develop a high-entropy barium titanate-based relaxor ceramic with enhanced energy storage properties.
• To investigate the material's performance across a wide temperature range and its cycling reliability.

Main Methods:

• Synthesis of a high-entropy BaTiO3-based relaxor ceramic.
• Characterization of energy storage density and efficiency under high electric fields.
• In-situ structural analysis to understand material behavior under varying temperatures and electric fields.

Main Results:

• Achieved a recoverable energy density of 10.9 J/cm³ and 93% energy efficiency at 720 kV/cm.
• Demonstrated excellent performance stability (-50 to 260 °C, <9% variation) and cycling reliability (10⁶ cycles at 450 kV/cm, 200 °C).
• High-entropy engineered local structures were found to be stable under thermal and electrical stress.

Conclusions:

• High-entropy engineering is effective for developing high-performance dielectric capacitors.
• The developed ceramic shows significant potential for high-temperature and high-power electrical applications.
• The material's stability and energy storage capabilities offer a paradigm for future capacitor development.