Research Progress and Prospects of High‐Entropy Oxide Ceramic for Dielectric Energy Storage

ABSTRACT Dielectric capacitors are key components in pulse power systems. However, due to the inherent trade‐off between high energy density and efficiency in traditional dielectric materials, their wider application has been limited. Recent advances in high‐entropy oxide ceramics (HECs) offer a transformative approach to simultaneously enhance breakdown strength, polarization behavior, and thermal stability through entropy‐driven design. This review comprehensively examines the underlying physical mechanisms responsible for the excellent energy storage properties of high‐entropy perovskite‐, tungsten bronzes‐, pyrochlore‐, bismuth‐layered‐based ceramics, and films, as well as multilayer ceramic capacitors (MLCCs). Furthermore, the integration of machine learning and phase‐field simulations for rational material design is discussed. Although encouraging results have been achieved, there are still challenges in establishing clear structure‐performance relationships and realizing scalable manufacturing. This review outlines the future directions for accelerating the development and practical application of high‐entropy dielectric energy storage ceramics.