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 ( F e T i ′ − V o ‥ − F e T i ′ ) , 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.

中文翻译：

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NBT-0.10BFO固溶体薄膜的高储能密度

摘要 为降低 Na0.5Bi0.5TiO3 薄膜的漏电流，提高其储能性能，采用溶胶-凝胶法制备 (1-x)Na0.5Bi0.5TiO3-xBiFeO3 (NBT-xBFO) (x = 0.00, 0.05, 0.10, 0.15) 无铅钙钛矿相固溶体薄膜。Fe3+占据Ti4+形成的点缺陷与氧空位形成复合缺陷(F e T i ′ − V o ‥ − F e T i ′ )，减少了氧空位，减少了畴壁钉扎，改善了极化，从而提高可回收能量密度。在所有薄膜中，NBT-0.10BFO薄膜在2000 kV/cm电场下表现出38.5 J/cm3的高可恢复能量密度和52.0%的储能效率。此外，该薄膜具有高达 1×109 次循环的耐疲劳性和在 20～110°C 的宽温度范围内具有合适的热稳定性。NBT-0.10BFO薄膜有望在储能领域具有广阔的应用前景。