Energy storage performance and thermal stability of BNT-SBT with artificially modulated nano-grains via aerosol deposition method. Issue 1 (2nd January 2022) - Kim, Min-Kyu
ABSTRACT: With the development of electrical industry, demand for a ceramic-based capacitor with high energy storage density has been increased gradually. The efficiency considered as a key factor of energy storage density is sensitive to temperature change. In this study, using the aerosol deposition (AD) method, we have fabricated lead-free 6Bi0.5 Na0.5 TiO3 (BNT)-4Sr0.7 Bi0.2 TiO3 (SBT) nano-grain composites to improve the energy storage properties and thermal stability. Through the novel AD method, artificially engineered ferroelectric thick films with nano-grain can be fabricated at room temperature. The thick films of 6BNT-4SBT post-annealed at 550°C had an energy storage density of 10.4 J/cm 3, high efficiency of 64.5% at 900 kV/cm, and excellent thermal stabilities (ΔWrec < ~9% and Δη < ~30%) heating to 140°C. These results reveal that 6BNT-4SBT thick films fabricated by the AD method have excellent dielectric properties and thermal stabilities as a lead-free material.