High-Entropy-Induced Polarization Discontinuity Enabling Ultrahigh and Temperature-Stable Energy Storage in Ceramic...

The development of multilayer ceramic capacitors (MLCCs) with high-energy storage performance over a wide temperature range is critical for practical applications but remains challenging. Here, we propose a high-entropy design to disrupt the long-range ferroelectric order of tetragonal tungsten bronze (TTB) ceramics, inducing a polarization discontinuity composed of coexisting polar nanoregions and non-polar regions. This unique configuration delays polarization saturation while minimizing hysteresis loss through electrostatic interactions. Consequently, the TTB-based MLCC achieves a high recoverable energy density (W_rec) of 15.8 J cm^-3 and an ultrahigh energy efficiency (η) of 97.5%, yielding a record-high figure of merit of 632 J cm^-3 for TTB-based ceramic capacitors. Furthermore, the MLCC exhibits outstanding thermal stability from 25°C to 150°C, maintaining W_rec ≈ 13.04 ± 0.41 J cm^-3 and η ≈ 95.43 ± 2.61%. The high-entropy-induced polarization discontinuity offers valuable insights into polarization modulation and provides an effective strategy for designing next-generation high-performance dielectrics.