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Featured with high polarization and large electric field‐induced phase transition, PbZrO3‐based antiferroelectric (AFE) materials are regarded as prospective candidates for energy‐storage applications. However, systematical studies on PbZrO3‐based materials are insufficient because of their complex chemical compositions and various phase structures. In this work, (Pb0.94La0.04)(Zr1‐x‐ySnxTiy)O3 (abbreviated as PLZST, 0 ≤ x ≤ 0.5, 0.01 ≤ y ≤ 0.1) AFE system was selected and the energy‐storage behavior was regulated. It is found that low Ti content benefits to obtain satisfactory electric breakdown strength, realizing high energy‐storage density. With Sn content increasing, the electric hysteresis decreases gradually, which is beneficial to improve energy conversion efficiency. As a result, a large recoverable energy‐storage density of 9.6 J/cm3 and a high energy conversion efficiency of 90.2% were achieved in (Pb0.94La0.04)(Zr0.49Sn0.5Ti0.01)O3 ceramic. This work reveals energy‐storage behavior of PLZST AFE materials systematically, providing reference for performance tailoring and new material designing in energy‐storage applications.

Filled and unfilled Sr 2 NaNb 5 O 15 -based tungsten bronze ceramics based on Gd doping were prepared using a traditional solid-state reaction method. Relaxor behaviors of the two different systems were analyzed, and the corresponding energy storage performance was also characterized. With the support of weakly coupled polar nanoregions and a non-polar matrix, an energy storage density of 2.37 J/cm 3 and an efficiency of 94.4% were obtained in the Sr 1.82 Gd 0.12 NaNb 5 O 15 ceramic. A discharge energy density of 2.51 J/cm 3 and a power density of 59.1 MW/cm 3 further proved its prospect for practical applications. In addition, the thermal stability and fatigue resistance of the ceramic were also evaluated. At the same time, under the theoretical framework of a perovskite and tungsten bronze, the contribution of vacancies to the local structure and relaxor behavior was briefly discussed. Because the currently used ceramics do not contain easily reducible metal oxides, this work lays the foundation for the development of multilayer ceramic capacitors that use base metals as internal electrodes.