Interfacial Polarization Restriction for Ultrahigh Energy‐Storage Density in Lead‐Free Ceramics

Abstract Dielectric capacitors with high power densities are crucial for pulsed electronic devices and clean energy technologies. However, their breakdown strengths ( E b ) strongly limit their power densities. Herein, by modifying the interfacial polarization by adjusting the difference in activation energies (Δϕ) between the grain and grain boundary phases, the significant enhancement of E b in the (1‐ x )(0.94Na 0.5 Bi 0.5 TiO 3 ‐0.06BaTiO 3 )‐ x Ca 0.7 La 0.2 TiO 3 (NBT‐BT‐ x CLT, x = 0, 0.18, 0.23, 0.28, 0.33, 0.38, and 0.43) ceramics is achieved. The results indicate that adding CLT introduces a super‐paraelectric state, refines grain size, and, most importantly, decreases the Δϕ value. When Δϕ is tuned…

• NN
  National Natural Science Foundation of China

  Awards: 12174001, 51872001, 12104001, 52173215, 11874394, 62074047
• AR
  Australian Research Council

  Award: DP190100150
• NS
  Natural Science Foundation of Anhui Province

  Award: 2008085QE205