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High energy storage and ultrafast discharge in NaNbO3-based lead-free dielectric capacitors via a relaxor strategy
Ceramics International ( IF 5.2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ceramint.2020.09.144
Xiaoyan Dong , Xu Li , Xiuli Chen , Hongyun Chen , Congcong Sun , Junpeng Shi , Feihong Pang , Huanfu Zhou

Abstract Dielectric capacitors with decent energy storage and fast charge-discharge performances are essential in advanced pulsed power systems. In this study, novel ceramics (1-x)NaNbO3-xBi(Ni2/3Nb1/3)O3(xBNN, x = 0.05, 0.1, 0.15 and 0.20) with high energy storage capability, large power density and ultrafast discharge speed were designed and prepared. The impedance analysis proves that the introducing an appropriate amount of Bi(Ni0·5Nb0.5)O3 boosts the insulation ability, thus obtaining a high breakdown strength (Eb) of 440 kV/cm in xBNN ceramics. A high energy storage density (Wtotal) of 4.09 J/cm3, recoverable energy storage density (Wrec) of 3.31 J/cm3, and efficiency (η) of 80.9% were attained in the 0.15BNN ceramics. Furthermore, frequency and temperature stability (fluctuations of Wrec ≤ 0.4% over 5–100 Hz and Wrec ≤ 12.3% over 20–120 °C) were also observed. The 0.15BNN ceramics exhibited a large power density (19 MW/cm3) and ultrafast discharge time (~37 ns) over the range of ambient temperature to 120 °C. These enhanced performances may be attributed to the improved breakdown strength and relaxor behavior through the incorporation of BNN. In conclusion, these findings indicate that 0.15BNN ceramics may serve as promising materials for pulsed power systems.

中文翻译:

通过弛豫策略实现基于 NaNbO3 的无铅介质电容器的高能量存储和超快放电

摘要 具有良好储能和快速充放电性能的介电电容器对于先进的脉冲电源系统至关重要。本研究设计了具有高储能能力、大功率密度和超快放电速度的新型陶瓷 (1-x)NaNbO3-xBi(Ni2/3Nb1/3)O3(xBNN, x = 0.05, 0.1, 0.15 and 0.20)并准备好了。阻抗分析证明,引入适量的Bi(Ni0·5Nb0.5)O3提高了绝缘能力,从而在xBNN陶瓷中获得了440 kV/cm的高击穿强度(Eb)。在 0.15BNN 陶瓷中获得了 4.09 J/cm3 的高储能密度 (Wtotal)、3.31 J/cm3 的可恢复储能密度 (Wrec) 和 80.9% 的效率 (η)。此外,频率和温度稳定性(Wrec ≤ 0.4% 超过 5–100 Hz 和 Wrec ≤ 12 的波动。3% 超过 20–120 °C)也被观察到。0.15BNN 陶瓷在环境温度至 120 °C 的范围内表现出大功率密度 (19 MW/cm3) 和超快放电时间 (~37 ns)。这些增强的性能可能归因于通过结合 BNN 提高的击穿强度和弛豫行为。总之,这些发现表明 0.15BNN 陶瓷可以作为脉冲电源系统的有前途的材料。
更新日期:2021-02-01
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