Enhanced energy storage performance of lead-free Sr_0.7Bi_0.2TiO₃ ceramics via tape casting

The development of pulsed power technology demands high energy storage density dielectric materials. In this study, Sr_0.7Bi_0.2TiO₃ relaxor ferroelectric (rFE) ceramic thick films were prepared using a tape-casting process. The ceramics exhibit a dense structure and typical rFE hysteresis curves, achieving an energy storage density of 4.77 J cm⁻³ and efficiency of 94.4%, attributed to the high polarization intensity, low remnant polarization, and low hysteresis loss of rFE. Additionally, the material demonstrates good temperature stability. Moreover, the Sr_0.7Bi_0.2TiO₃ ceramic thick films show advantages in charge-discharge performance, capable of discharging within hundreds of nanoseconds and achieving a power density of 137 MW cm⁻³. Overall, the Sr_0.7Bi_0.2TiO₃ ceramic thick film exhibits a comprehensive performance advantage in terms of energy storage density, efficiency, and power density. Additionally, the material was fabricated using the tape-casting process, which is compatible with subsequent multilayer ceramic capacitor production, indicating potential for further performance enhancement.