Polymorphic relaxor phase and defect dipole polarization co-reinforced capacitor energy storage in temperature-monitorable high-entropy ferroelectrics

Energy storage high-entropy ceramics are famous for their ultrahigh power density and ultrafast discharge rate. However, achieving a synchronous combination of high energy density and efficiency along with intelligent temperature-monitorable function remains a significant challenge. Here, based on high-entropy strategy and phase field simulation, the polarization response of domains in Bi0.5Na0.5TiO3-based ceramics is optimized by constructing a concomitant nanostructure of defect dipole polarization and a polymorphic relaxor phase. The optimal ceramic possesses a high recyclable energy storage density (11.23 J cm−3) and a high energy storage efficiency (90.87%) at 670 kV cm−1. Furthermore, real-time…

• NN
  National Natural Science Foundation of China

  Awards: 12104093, 52102126
• NS
  Natural Science Foundation of Fujian Province

  Awards: 2021J05122, 2022J01552, 2022J01087, 52072075, 2021J05123, 2023J01259
• FU
  Fuzhou University

  Award: GXRC-20099