Bi0.1Na0.7NbO3改性的无铅Bi0.5(Na, K)0.5TiO3陶瓷中增强的能量存储性能

To meet the production requirements of high-performance lead-free dielectric capacitor, Bi 0.1 Na 0.7 NbO 3 (BNN) was introduced into Bi 0.5 (Na 0.82 K 0.18 ) 0.5 TiO 3 (BNKT) ceramics. The phase structure, microstructure, dielectric, and energy storage properties of BNKT- x BNN ( x = 0–0.20) were systematically analyzed. The incorporation of BNN reduced the remnant polarization ( P r ) and enhanced the relaxor behavior, thus improving the energy storage properties. In particular, the BNKT-0.10BNN composition achieved a high recoverable energy storage density ( W rec ) of 1.95 J/cm 3 with an energy efficiency ( η ) of 76.2%. Moreover, the temperature coefficient of capacitance ( TCC ) for x = 0.10 composition remained below 15% across 37–400 °C, exhibiting a high dielectric constant (3066) and low dielectric loss (tan δ = 0.0032) at 150 °C. These results not only provide insights into enhancing the energy storage capabilities of BNT-based ceramics but also present potential materials for high-temperature stable capacitors.