Zenghui Liu

Polymer dielectrics are vital for high-power electronics, yet their high-temperature application is fundamentally constrained by the inherent trade-offs among thermal stability, polarization retention, and conduction loss. Here, we mitigate these limitations by integrating high-entropy nanofillers with a preferentially oriented, wide-bandgap inorganic nanocoating to construct a multiscale heterointerfacial architecture. Within this design, entropy-driven compositional disorder enhances the structural stability and polarization response of the nanofillers, while the conformal inorganic network synergistically suppresses carrier injection and modulates bulk trap-mediated transport. Consequently, the engineered composites deliver a discharged energy density of 10.44 J cm⁻³ with 95% efficiency and a breakdown strength of 650 MV m⁻¹ at room temperature. Notably, at 150 °C, the composites retain 8.35 J cm⁻³, 80% efficiency, and a breakdown strength of 610 MV m⁻¹. First-principles calculations and phase-field simulations suggest multiscale field confinement that weakens electrothermal coupling and enhances high-temperature stability. This work establishes a comprehensive, multiscale design paradigm for next-generation polymer dielectric capacitors operating in extreme thermal environments.

A novel weakly coupled lead-free ergodic relaxor BaTiO ₃ –Bi(Zn _2/3 Ta _1/3 )O ₃ is designed to achieve good energy storage properties under low electric fields. The underlying mechanism of the enhanced properties is elucidated.

The medium- or high-entropy strategy has emerged as a new paradigm for designing high-performance piezoelectric ceramics. However, the effectiveness of this approach remains unclear to the development of high Curie temperature (TC) piezo-/ferroelectric materials with outstanding performance. To develop high-performance piezo-/ferroelectric materials suitable for high-temperature environments, in this work, we design a novel ceramic system based on a medium-entropy morphotropic phase boundary (ME-MPB) strategy. Piezo-/ferroelectric ceramics of the formula, Pb(Yb1/2Nb1/2)O3–Pb(In1/2Nb1/2)O3–PbTiO3, meeting the medium entropy criteria, were successfully synthesized using the conventional solid-state reaction method. The crystal structure, microstructure, dielectric, piezoelectric, and ferroelectric properties of the ceramics of the ME-MPB compositions were systematically investigated. X-ray diffraction and scanning electron microscopy analyses revealed that these ceramics possess a pure perovskite phase and dense microstructure. Notably, the prepared ceramics exhibited exceptional piezoelectric performance, with a high d33 up to 603 pC/N, a large strain of 0.20%, a high remanent polarization of 44.0 μC/cm2, and a high Curie temperature of 362 °C. This study demonstrates an effective design approach based on the ME-MPB strategy and points out a new pathway for developing high-performance materials for high-temperature applications as sensors, thereby expanding the research perspective on the design of medium-entropy piezo-/ferroelectric ceramics.