K0.5Na0.5NbO3掺杂对0.94Bi0.5Na0.5TiO3-0.06BaTiO3陶瓷储能性能的影响

摘要/Abstract

摘要： 采用传统固相反应法制备了K_0.5Na_0.5NbO₃(KNN)掺杂的无铅介电储能陶瓷BNT-BT-KNN,其组分配比为0.94Bi_0.5Na_0.5TiO₃-(0.06-x)BaTiO₃-xK_0.5Na_0.5NbO₃(BNT-BT+xKNN, x=0.00~0.04),并研究了KNN掺杂对BNT-BT基陶瓷材料晶相、微观结构、介电、铁电性能及储能的影响。结果表明:在1 150 ℃温度下烧成后的陶瓷样品具有纯的钙钛矿结构,且样品的晶粒均匀致密;介电温谱显示,添加KNN后的BNT-BT铁电陶瓷在T_m处的介电峰进一步宽化,表现出更好的温度稳定性和弛豫性;同时随着KNN掺杂量的增加,样品的电滞曲线(P-E曲线)逐渐由“宽胖型”向“细长型”转变,样品的剩余极化强度(P_r)逐渐降低,从而进一步提高了BNT-BT陶瓷的储能性能。在2 kV/mm的场强下,x=0.03时测得样品的储能密度最佳W_rec=0.048 J/cm³,对应的储能效率η=43%,显示该材料在储能电容器上具有良好的应用潜力。

关键词: BNT-BT陶瓷, KNN掺杂, 固相反应法, 弛豫, 铁电性能, 介电性能, 储能

Abstract: A series of lead-free dielectric energy storage ceramics BNT-BT-KNN with a composition ratio of 0.94Bi_0.5Na_0.5TiO₃-(0.06-x)BaTiO₃-xK_0.5Na_0.5NbO₃(BNT-BT+xKNN, x=0.00~0.04) were prepared by solid state reaction method. The effect of KNN doping on the crystal structure, micro-structure, dielectric, ferroelectric properties and energy storage efficiency of BNT-BT-based ceramic was investigated. The results show that all the samples exhibit the pure perovskite structure with uniform and dense grains in the medium after sintering at 1 150 ℃. The addition of KNN further broadens the dielectric peak at T_m which resulted in better temperature stability and relaxation. With the increase of KNN dopant, the hysteresis curves (P-E curves) of the samples gradually change from “broad and fat” to “slender” and the residual polarization (P_r) of the ceramic samples decrease, thus the energy storage performance of BNT-BT ceramics are further improved. The optimal energy storage density of W_rec=0.048 J/cm³ was achieved at x=0.03 under a field strength of 2 kV/mm, which corresponds to an energy storage efficiency of η=43%, which proves that this material has a promising potential for application in energy storage capacitors.

Key words: BNT-BT, KNN doping, solid state reaction method, relaxor, ferroelectric property, dielectric property, energy storage

中图分类号:

TQ174.1

苗健, 邵辉, 曹瑞龙. K_0.5Na_0.5NbO₃掺杂对0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃陶瓷储能性能的影响[J]. 人工晶体学报, 2024, 53(5): 882-888.

MIAO Jian, SHAO Hui, CAO Ruilong. Effect of K_0.5Na_0.5NbO₃ Doping on the Energy Storage Performance of 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ Ceramics[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(5): 882-888.

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K_0.5Na_0.5NbO₃掺杂对0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃陶瓷储能性能的影响

Effect of K_0.5Na_0.5NbO₃ Doping on the Energy Storage Performance of 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ Ceramics

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