Authors: Feiyu Su, Zide Yu, Yi Zhang, Haoyu Wang, Zijia Xu, Ao Tian, Zeyu Sui, Yang Lv, Jian Fu, Xiaoming Shi, He Qi, Tengfei Hu, Zhengqian Fu, Ruzhong Zuo
Published: 2025-03-17
Source: Full article
AbstractDespite the widespread research of relaxor ferroelectrics in pulsed power capacitors, achieving both high recoverable energy density (Wrec) and efficiency (η) under moderate electric field range is still challenged because domain miniaturization required to enhance η generally leads to the delayed polarization saturation and the reduced spontaneous polarization. Here, highly polarizable clusters of superparaelectrics with locally coexisted multiphase are demonstrated by introducing Bi0.5Li0.5ZrO3 into the BaTiO3 matrix. The synergistic introduction of additional A‐site polarization contribution, the miniaturization of domains into polar clusters, and the local multiphase coexistence enable both the high maximal polarization (Pmax) at the moderate electric field and the extremely low polarization hysteresis. As a result, the combined effects of heterogeneous cations with A‐site driven ferroelectricity, A‐site valence state difference, and A‐ and B‐sites ionic radius difference lead to both giant Wrec of ≈9.11 J cm−3 and high η of ≈95.3% concurrently under a moderate electric field of 47 kV mm−1. This work demonstrates that modulating the polarization characteristic of relaxor ferroelectric ceramics can achieve low electric field driven superior energy‐storage performances.