Simultaneously Enhanced Energy Storage Density and Efficiency in BNT-Based Lead-Free Ceramics

Area of Science:

• Materials Science
• Energy Storage
• Ceramics

Background:

• Lead-free ceramics are essential for pulsed power systems due to their energy storage capabilities.
• Low energy density in current lead-free ceramics hinders miniaturization and lightweight device development.

Purpose of the Study:

• To enhance the energy density of lead-free ceramics for advanced pulsed power applications.
• To investigate the effects of incorporating Sr(Ti0.5Zr0.5)O3 into a (Bi0.47La0.03Na0.5)0.94Ba0.06TiO3 matrix.

Main Methods:

• Tape-casting technique used for uniform and dense microstructure fabrication.
• Introduction of Sr(Ti0.5Zr0.5)O3 to modify grain size, bandgap, and polar nanoregions.

Main Results:

• Optimized ceramics achieved a recoverable energy density of 6.05 J/cm3 with 90% efficiency at 560 kV/cm.
• Enhanced maximum applied electric field and reduced remnant polarization observed.
• Excellent stability demonstrated across 25-160 °C and 10^4 cycles.

Conclusions:

• The developed (Bi0.47La0.03Na0.5)0.94Ba0.06TiO3-Sr(Ti0.5Zr0.5)O3 lead-free ceramic shows significant potential for pulsed power systems.
• Tape-casting fabrication enhances performance for high-energy storage applications.