通过引入La(Mg0.5Zr0.5)O3提升(Bi0.5Na0.5)0.7Sr0.3TiO3陶瓷的能量存储性能

With the development of pulsed power devices in the direction of miniaturization, integration, and safety, the development of dielectric capacitors with large energy storage density ( W rec ), high energy storage efficiency ( η ), and decent energy storage stability has become an important topic that needs to be discussed in depth in the academic community. In this study, (1 − x )(Bi 0.5 Na 0.5 ) 0.7 Sr 0.3 TiO 3 - x La(Mg 0.5 Zr 0.5 )O 3 [(1 − x )BNST- x LMZ] ceramics were prepared by traditional solid-phase method. Through rational component manipulation, the introduction of LMZ effectively disrupted the long-range ordered arrangement of the original matrix, constructing short-range polar nano-microregions that consequently delayed the saturation polarization of ceramics and reduced the residual polarization. Meanwhile, the introduction of LMZ significantly affects the microstructure and relaxor behavior of BNST-based ceramics, resulting in reduced grain size and a more compact ceramic structure. It was found that 0.85BNST-0.15LMZ ceramic exhibited decent energy storage performance under an electric field of 400 kV/cm, with a large W rec of 4.53 J/cm and high η of 87.50%. It is noted that 0.85BNST-0.15LMZ ceramics exhibited ultra-fast discharge rate of 23 ns. These results indicate that 0.85BNST-0.15LMZ ceramics have broad development prospects in the field of supercapacitors for energy storage.