Abstract
The ferroelectric, leakage, dielectric, and energy storage properties of lead‐free Na0.5K0.5NbO3/BiMnO3 (KNN/BMO) solid‐solution films are investigated. The strong ferroelectric relaxation behaviors of slim ferroelectricity with small remanent polarization and coercive field induce a high energy‐storage density and efficiency at room temperature. The energy density reaches 14.8 J cm−3, even the efficiency is up to 79.79% under the applied electric field of 985.66 kV cm−1. Moreover, the energy storage performances of KNN/BMO solid‐solution films exhibit good thermal stability over a wide temperature range and high ferroelectric fatigue endurance after switching 106 bipole electrical cycles. KNN/BMO solid‐solution films can replace lead‐based films and other outstanding lead‐free systems in the energy storage performance.
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