NaNbO3-CaZrO3-Bi0.5Na0.5TiO3三元系陶瓷的相结构与储能性能

王子瑄; 李卓; 张家勇; 张静; 牛艳辉

硅酸盐学报, 2023, 51 (6): 1530, 网络出版: 2023-08-13

NaNbO₃-CaZrO₃-Bi_0.5Na_0.5TiO₃三元系陶瓷的相结构与储能性能

Structure and Energy Storage Characteristics of NaNbO₃-CaZrO₃-Bi_0.5Na_0.5TiO₃ Ternary System Ceramics

论文大纲

王子瑄 ^*李卓张家勇张静牛艳辉

作者单位

长安大学材料科学与工程学院，西安 710064

铌酸钠反铁电陶瓷储能性能温度稳定性 sodium niobate antiferroelectric ceramics energy storage performance temperature stability

摘要

铌酸钠(NaNbO3)无铅陶瓷由于其无毒和出色的储能性能，在脉冲功率电容器领域吸引了越来越多的关注。然而，由于较大的有效储能密度(Wrec)和高的储能效率(η)不能同时实现，限制了其商业化。通过构建局域随机场，增加弛豫特性来提高储能性能的策略。采用传统固相法制备了(1-x)(0.96NaNbO3-0.04CaZrO3)-xBi0.5Na0.5TiO3 (x=0.05、0.10、0.15、0.20)反铁电储能陶瓷，研究了不同含量Bi0.5Na0.5TiO3对0.96NaNbO3-0.04CaZrO3 陶瓷的相结构、微观形貌、介电性能和储能特性的影响。结果表明：随着Bi0.5Na0.5TiO3含量的增加，(1-x)(0.96NaNbO3-0.04CaZrO3)-xBi0.5Na0.5TiO3固溶体由反铁电正交P相(x≤0.10)转变为反铁电正交R相(x≥0.15)，同时介电峰向低温方向移动并变矮宽化，呈现出明显的弛豫特性。其中，0.85(0.96NaNbO3- 0.04CaZrO3)-0.15Bi0.5Na0.5TiO3陶瓷在室温260 kV/cm的场强下展示出最好的储能性能(储能密度Wrec=1.614 J/cm3，储能效率η=83.97%)，且当温度在25~150 ℃变化时，表现出良好的温度的稳定性(Wrec变化幅度＜15%)，同时兼具良好的储能效率，是一种非常有前途的高温脉冲功率电容器材料。

Abstract

Sodium niobate(NaNbO3)-based lead-free ceramics have attracted much attention in the pulse power capacitors due to their non-toxicity and superior energy storage properties. However, the large recoverable energy-storage density (Wrec) and efficiency (η) cannot be achieved simultaneously, thus restricting their commercialization. This work proposed astrategy of increasing the relaxation characteristics to improve the energy storage performance via constructing a local random field. The (1-x)(0.96NaNbO3- 0.04CaZrO3)-xBi0.5Na0.5TiO3 (x=0.05, 0.10, 0.15, and 0.20) antiferroelectric energy storage ceramics were prepared by a conventional solid-state method. The effect of Bi0.5Na0.5TiO3 content on the phase structure, microstructure and dielectric, ferroelectric as well as energy storage properties of 0.96NaNbO3-0.04CaZrO3 ceramics was investigated. The results show that the microstructure of each ceramic is homogeneous and dense. The (1-x)(0.96NaNbO3-0.04CaZrO3)-xBi0.5Na0.5TiO3 solid solution transformsfrom antiferroelectric orthorhombic P phase (x≤0.10) to antiferroelectric orthorhombic R phase (x≥0.15), accompanied by abroadening dielectric peak moving towards the lower temperatures as Bi0.5Na0.5TiO3 content increases, thus having the representative relaxation characteristics. The 0.85(0.96NaNbO3-0.04CaZrO3)-0.15Bi0.5Na0.5TiO3 ceramic has a maximum energy storage density Wrec of 1.614 J/cm3 and a high energy storage efficiency η of 83.97% under 260 kV/cm at room temperature. Besides, the ceramic exhibits a good temperature stability at 25-150 ℃ (the variation of Wrec less than 15%) and a high energy storage efficiency, which can be used as a promising material for high-temperature pulsed power capacitors.

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王子瑄, 李卓, 张家勇, 张静, 牛艳辉. NaNbO₃-CaZrO₃-Bi_0.5Na_0.5TiO₃三元系陶瓷的相结构与储能性能[J]. 硅酸盐学报, 2023, 51(6): 1530. WANG Zixuan, LI Zhuo, ZHANG Jiayong, ZHANG Jing, NIU Yanhui. Structure and Energy Storage Characteristics of NaNbO₃-CaZrO₃-Bi_0.5Na_0.5TiO₃ Ternary System Ceramics[J]. Journal of the Chinese Ceramic Society, 2023, 51(6): 1530.

NaNbO₃-CaZrO₃-Bi_0.5Na_0.5TiO₃三元系陶瓷的相结构与储能性能

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