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Abstract Electrostatic capacitors are emerging as a highly promising technology for large‐scale energy storage applications. However, it remains a significant challenge to improve their energy densities. Here, an effective strategy of introducing non‐isovalent ions into the BiFeO 3 ‐based (BFO) ceramic to improve energy storage capability via delaying polarization saturation is demonstrated. Accordingly, an ultra‐high energy density of up to 7.4 J cm −3 and high efficiency ≈ 81% at 680 kV m −1 are realized, which is one of the best energy storage performances recorded for BFO‐based ceramics. The outstanding comprehensive energy storage performance is attributed to inhibiting the polarization hysteresis resulting from generation ergodic relaxor zone and random field, and generating highly‐delayed polarization saturation with continuously‐increased polarization magnitudes with the electric field of supercritical evolution. The contributions demonstrate that delaying the polarization saturation is a consideration for designing the next generation of lead‐free dielectric materials with ultra‐high energy storage performance.
Zhao et al. (Tue,) studied this question.