Abstract
To reduce the leakage current of the Na0.5Bi0.5TiO3 film and improve its energy storage properties, the sol-gel method was implemented to prepare (1-x)Na0.5Bi0.5TiO3-xBiFeO3 (NBT-xBFO) (x = 0.00, 0.05, 0.10, 0.15) lead-free perovskite-phase solid solution films. The point defects formed by Fe3+ occupying Ti4+ and oxygen vacancies formed composite defects FeTi′−Vo··−FeTi′, which reduced oxygen vacancies, cut down the domain wall pinning, and improved the polarization, thereby enhancing the recoverable energy density. Among all the films, the NBT-0.10BFO film exhibited a high recoverable energy density of 38.5 J/cm3 and an energy storage efficiency of 52.0% under an electric field of 2000 kV/cm. In addition, this film had fatigue resistance up to 1 × 109 cycles and suitable thermal stability within a wide temperature range of 20~110 °C. The NBT-0.10BFO film is expected to have broad application prospects in the field of energy storage.
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