Enhancing the Energy Storage Performance of Flexible Na_0.5Bi_0.5TiO₃-Based Relaxor Thin Films Through a Relaxor...

Area of Science:

• Materials Science
• Solid State Physics
• Ceramics

Background:

• Dielectric capacitors are crucial for defense and automotive applications due to rapid charge-discharge capabilities.
• High leakage current density in Na0.5Bi0.5TiO3 (NBT) limits its performance.
• Strontium titanate (STO) offers excellent insulation properties.

Purpose of the Study:

• To enhance the breakdown field strength and relaxor characteristics of NBT by incorporating STO.
• To investigate the effect of STO addition on the structural and dielectric properties of NBT.
• To optimize NBT-based materials for high-performance energy storage applications.

Main Methods:

• Thin film fabrication of 0.95(Na0.5Bi0.5)(Fe0.02Ti0.99)O3-0.05SrTiO3.
• Structural analysis to observe lattice distortion and domain formation.
• Dielectric property measurements, including energy storage density and efficiency.

Main Results:

• Incorporation of STO into NBT induced lattice distortion and enhanced relaxor behavior (relaxation degree γ increased from 1.63 to 1.84).
• The NBT-STO thin film achieved a high recoverable energy storage density (Wrec) of 43.88 J/cm³ and an efficiency (η) of 73.95%.
• The material demonstrated excellent temperature and frequency stability, along with robust fatigue endurance (1 × 10⁸ cycles).

Conclusions:

• The addition of STO effectively mitigates leakage current and enhances energy storage properties of NBT.
• The developed NBT-STO thin films are promising for high-performance dielectric energy storage applications.
• This research provides valuable insights for the development of advanced NBT-based energy storage materials.