(1-x)NaNbO3-x(0.3Bi0.5Na0.5TiO3-0.7BiFeO3)陶瓷的介电以及储能性能研究

doi:10.6023/A24010028

摘要/Abstract

采用常规固相法制备(1-x)NaNbO₃-x(0.3Bi_0.5Na_0.5TiO₃-0.7BiFeO₃)[NN-x(BNT-BF)](x = 0.05, 0.1, 0.15, 0.2)陶瓷,并对其物相组成、微观形貌、介电与储能特性进行系统研究。结果表明,随着BNT-BF含量的增加,NN-x(BNT-BF)陶瓷逐渐由正交反铁电P相和R相共存(x < 0.1)转变为单一反铁电R相(x ≥ 0.1),弛豫行为增强。BNT-BF掺杂显著改善了陶瓷的致密度,且陶瓷的平均晶粒尺寸随着掺杂量增大先减小后增大。同时取代NaNbO₃的A位和B位可破坏NN原有的铁电长程有序结构,优化陶瓷的储能性能。在410 kV/cm的击穿场强(E_b)下,NN-0.2(BNT-BF)陶瓷的有效储能密度(W_rec)和储能效率(η)分别为2.54 J/cm³和89.24%,且在20-120 ℃的温度范围内具有高的温度稳定性。同时,高功率密度(P_D = 49 MW/cm³)、大电流密度(C_D = 406 A/cm²)和超快放电速度(t_0.9 = 35 ns)使得NN-0.2(BNT-BF)陶瓷在脉冲功率系统中具有潜在的应用前景。

关键词: 铌酸钠, 介电性能, 储能性能, 温度稳定性, 充放电性能

Sodium niobate (NaNbO₃) ceramic, as a representative of antiferroelectric materials, has been widely studied in the field of energy storage due to its environmental friendliness and non-toxicity. However, its application is greatly limited due to its square hysteresis loop, which leads to low recoverable energy storage density (W_rec). Introducing a second component into NaNbO₃ to form a solid solution can enhance its energy storage properties. According to this train of thoughts, (1-x)NaNbO₃-x(0.3Bi_0.5Na_0.5TiO₃-0.7BiFeO₃)[NN-x(BNT-BF)](x = 0.05, 0.1, 0.15, 0.2) ceramics were designed through substituting the A- and B- sites of NaNbO₃ with Bi³⁺, Fe³⁺, and Ti⁴⁺ simultaneously in this work. The NN-x(BNT-BF) ceramics were prepared by the conventional solid-state reaction method, and their phase compositions, microstructures, dielectric and energy storage properties were systematically investigated by X-ray diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), dielectric property measurements and ferroelectric testing. The results showed that with the increase of BNT-BF content, the phase composition of the NN-x(BNT-BF) ceramics gradually transformed from coexistence of orthogonal antiferroelectric P and R phases (x < 0.1) to single antiferroelectric R phase (x ≥ 0.1), and the relaxation behavior was significantly enhanced. The densification of the NN-x(BNT-BF) ceramics was remarkably improved. With the increase of BNT-BF content, the average grain size of the NN-x(BNT-BF) ceramics was firstly declined and then increased. Moreover, replacing the A- and B- sites of NaNbO₃ by Bi³⁺, Fe³⁺, and Ti⁴⁺ simultaneously could disrupt its original long-range antiferroelectric ordered structure, thus optimizing energy storage performances of the ceramics. At a high breakdown field strength (E_b) of 410 kV/cm, the NN-0.2(BNT-BF) ceramic achieved W_rec of 2.54 J/cm³, and excellent energy storage efficiency (η) of 89.24%. In addition, the NN-0.2(BNT-BF) ceramic exhibited a high temperature stability in the temperature range of 20-120 ℃. Meanwhile, large power density (P_D = 49 MW/cm³), high current density (C_D = 406 A/cm²), and ultrafast discharge rate (t_0.9 = 35 ns) made the NN-0.2 (BNT-BF) ceramic have potential applications in pulse power systems.

Key words: sodium niobate, dielectric properties, energy storage properties, temperature stability, charge-discharge properties

引用此文

郭云凤, 王俊贤, 王泽星, 李家茂, 刘畅. (1-x)NaNbO₃-x(0.3Bi_0.5Na_0.5TiO₃-0.7BiFeO₃)陶瓷的介电以及储能性能研究[J]. 化学学报, doi: 10.6023/A24010028.

Guo Yunfeng, Wang Junxian, Wang Zexing, Li Jiamao, Liu Chang. Dielectric and Energy Storage Properties of (1-x)NaNbO₃-x(0.3Bi_0.5Na_0.5TiO₃-0.7BiFeO₃) Ceramics[J]. Acta Chimica Sinica, doi: 10.6023/A24010028.

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(1-x)NaNbO₃-x(0.3Bi_0.5Na_0.5TiO₃-0.7BiFeO₃)陶瓷的介电以及储能性能研究

Dielectric and Energy Storage Properties of (1-x)NaNbO₃-x(0.3Bi_0.5Na_0.5TiO₃-0.7BiFeO₃) Ceramics

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