通过优化场致相变实现 La 和 Ta 共掺杂 AgNbO3 陶瓷的超高储能密度,ACS Applied Materials & Interfaces

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通过优化场致相变实现 La 和 Ta 共掺杂 AgNbO3 陶瓷的超高储能密度
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-13 , DOI: 10.1021/acsami.2c20508
Boyuan Li ₁ , Zhongna Yan ₂ , Xuefan Zhou ₁ , He Qi ₃ , Vladimir Koval ₄ , Xiaogang Luo ₁ , Hang Luo ₁ , Haixue Yan ₅ , Dou Zhang ₁

Affiliation

由于快速充电/放电速率和高功率密度，储能电容器广泛用于脉冲功率设备。然而，介电电容器的低储能密度和效率限制了它们在现代储能应用中的进一步商业化。无铅 AgNbO ₃基反铁电（AFE）陶瓷被认为是最有前途的介电电容器环保材料之一，因为它们具有双极化-电场磁滞回线，剩余极化小，最大极化大。这些特性的增强允许实现反铁电材料的储能密度和效率的协同改进。这项工作报告了一种可行的共掺杂策略，该策略能够制备具有高储能性能的 AgNbO _{3基陶瓷。}将 La ³⁺和 Ta ⁵⁺离子引入 AgNbO ₃发现钙钛矿晶格以减少局部极性区域为代价增加了反铁电相的结构稳定性，导致电场引起的反铁电-铁电相变向更高的场移动。_{Ag 0.94} La _0.02 Nb _0.8 Ta _0.2 O ₃陶瓷在540 kV/cm的单极电场下获得了6.73 J/cm ³的超高可恢复储能密度和74.1%的高储能效率。这些值代表了迄今为止报道的无铅陶瓷中的最佳能源性能。因此，La ³⁺ /Ta ⁵⁺共掺杂已被证明是改善 AgNbO ₃陶瓷储能性能的良好途径。

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Achieving Ultrahigh Energy Storage Density of La and Ta Codoped AgNbO3 Ceramics by Optimizing the Field-Induced Phase Transitions

Energy storage capacitors are extensively used in pulsed power devices because of fast charge/discharge rates and high power density. However, the low energy storage density and efficiency of dielectric capacitors limit their further commercialization in modern energy storage applications. Lead-free AgNbO₃-based antiferroelectric (AFE) ceramics are considered to be one of the most promising environmentally friendly materials for dielectric capacitors because of their characteristic double polarization–electric field hysteresis loops with small remanent polarization and large maximum polarization. An enhancement of these characteristics allows achieving a synergistic improvement of both the energy storage density and efficiency of the antiferroelectric materials. This work reports on a feasible codoping strategy enabling the preparation of AgNbO₃-based ceramics with high energy storage performance. An introduction of La³⁺ and Ta⁵⁺ ions into the AgNbO₃ perovskite lattice was found to increase the structural stability of the antiferroelectric phase at the expense of a reduction of local polar regions, resulting in the shifting of the electric field-induced antiferroelectric–ferroelectric phase transition toward higher fields. An ultrahigh recoverable energy storage density of 6.73 J/cm³ and high energy storage efficiency of 74.1% are obtained for the Ag_0.94La_0.02Nb_0.8Ta_0.2O₃ ceramic subjected to a unipolar electric field of 540 kV/cm. These values represent the best energy performance in reported lead-free ceramics so far. Hence, the La³⁺/Ta⁵⁺ codoping has been shown to be a good route to improve the energy storage properties of AgNbO₃ ceramics.

更新日期：2023-01-13

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