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Enhanced energy density and discharged efficiency of lead-free relaxor (1-x)[(Bi0.5Na0.5)0.94Ba0.06]0.98La0.02TiO3-xKNb0.6Ta0.4O3 ceramic capacitors
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-03-24 , DOI: 10.1016/j.cej.2020.124879
Hua Wang , Huan Yuan , Xiaoyan Li , Fangfang Zeng , Keying Wu , Qiaoji Zheng , Guifen Fan , Dunmin Lin

Ceramic capacitors have optimistic application prospects in the field of high power density energy storage. However, most of the investigations have sought to increase energy storage density (W), but ignore the importance of energy storage efficiency (η). In this work, the novel KNb0.6Ta0.4O3-modified [(Bi0.55Na0.45)0.94Ba0.06]0.98La0.02TiO3 ceramics were designed and prepared. Particularly, the long-range order of ferroelectricity for the ceramic is broken due to the addition of KNb0.6Ta0.4O3 (KNT), which causes shoulder dielectric peak (Ts) to move towards low temperatures and increases the content of weakly polar phase. Therefore, the remanent polarization Pr is effectively decreased, but the large saturation polarization Ps is maintained, leading to simultaneously high η and large W. Moreover, the addition of KNT significantly reduces the grain size, causing an enhanced dielectric breakdown strength (DBS). As a result, ultra-high values for η of 92.9% and Wrec of 2.1 J/cm3 are realized in the ceramic with x = 0.10, which are superior to most of the reported ceramic capacitors under the similar electric field. More importantly, the ceramic exhibits excellent thermal (25 - 150 oC) and frequency stability (5 - 105 Hz). The present strategy of adjusting the Ts and weakly polar phase provides a promising approach to design novel Bi0.5Na0.5TiO3-based materials with excellent energy storage performance.



中文翻译:

无铅松弛剂(1- x)[(Bi 0.5 Na 0.50.94 Ba 0.06 ] 0.98 La 0.02 TiO 3 - x KNb 0.6 Ta 0.4 O 3陶瓷电容器的能量密度和放电效率提高

陶瓷电容器在高功率密度储能领域具有广阔的应用前景。但是,大多数研究都试图提高储能密度(W),但却忽略了储能效率(η)的重要性。在这项工作中,设计并制备了新型的KNb 0.6 Ta 0.4 O 3改性的[(Bi 0.55 Na 0.450.94 Ba 0.06 ] 0.98 La 0.02 TiO 3陶瓷。特别是,由于添加了KNb 0.6 Ta 0.4,打破了陶瓷的铁电长程分布O 3(KNT)会导致肩部电介质峰(T s)向低温移动,并增加弱极性相的含量。因此,有效地减小了剩余极化强度P r,但是保持了较大的饱和极化强度P s,从而同时导致了高η和大的W。此外,添加KNT大大减小了晶粒尺寸,从而提高了介电击穿强度(DBS )。结果,在具有x的陶瓷中实现了η为92.9%和W rec为2.1 J / cm 3的超高值。= 0.10,在类似电场下优于大多数报道的陶瓷电容器。更重要的是,陶瓷具有出色的热稳定性(25-150 o C)和频率稳定性(5-105 Hz)。当前的调节T s和弱极性相的策略为设计具有优异储能性能的新型Bi 0.5 Na 0.5 TiO 3基材料提供了一种有前途的方法。

更新日期:2020-03-26
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