High Entropy‐Driven Large Capacitive Energy Storage in BaTiO 3 ‐Based Multilayer Ceramic Capacitors

Abstract Multilayer ceramic capacitors (MLCCs) with ultrahigh power density are critical components in electronic products. However, with the accelerating miniaturization and integration of electronic devices, MLCCs are confronted with the challenge of achieving high capacitive energy storage performance and excellent stability simultaneously. Herein, guided by a phase‐field simulation method, a strategic high entropy‐driven design is employed to induce atomic‐scale lattice distortions and construct nano‐scale local heterogeneous polarization configurations. This approach effectively enhances the resistivity of ceramic dielectrics, weakens the anisotropic field, and lowers the domain‐switching barrier. Benefiting from these entropy‐driven characteristics and device‐scale design, an impressively high recoverable energy storage density of 17.2 J cm −3 and an energy storage efficiency of 95.5% are achieved in the BaTiO 3 ‐based high entropy MLCCs. Notably, these MLCCs also exhibit excellent temperature stability (energy storage performance change rate <4%) within a broad temperature range of 25–150 °C, while showing an extremely low performance degradation rate (<1%) during 10 6 cycles. Moreover, this study systematically unravels the underlying mechanism linking entropy‐driven local lattice distortions, polarization configurations, and capacitive energy storage performance, thereby offering an innovative design paradigm for optimizing MLCCs energy storage via high entropy design.