Ultrahigh energy storage density and instantaneous discharge power density in BaO-PbO-Na2O-Nb2O5-SiO2-Al2O3 glass-ceramics

作者：Wang, Shujian; Tian, Jia; Liu, Jingran; Yang, Ke; Shen, Bo; Zhai, Jiwei^*

来源：Journal of Materials Chemistry C, 2018, 6(46): 12608-12614.

DOI：10.1039/c8tc04096f

• CRYSTALLIZATION KINETICS BEHAVIOR
• DIELECTRIC-PROPERTIES
• UP-CONVERSION
• FERROELECTRIC CERAMICS
• MICROSTRUCTURE
• PERFORMANCES
• TEMPERATURE

Compared with traditional dielectric materials, ferroelectric glass-ceramic capacitors have higher energy storage densities and faster discharge speeds. In this study, 21.6BaO-2.4PbO-6Na(2)O-30Nb(2)O(5)-10Al(2)O(3)-30SiO(2) glass-ceramics and their single-layer capacitors were successfully prepared. A maximum energy storage density of 20.7 J cm(-3) was obtained in these glass-ceramics. For glass-ceramics capacitors crystallized at 900 degrees C, under an electric field of 400 kV cm(-1), the maximum instantaneous power density reached was 78.2 MW cm(-3) and the discharge time was <35 ns. The effects of crystallization temperature on dielectric energy storage properties were illustrated by investigating the crystallization kinetics, phase evolution, and microstructure of these glass-ceramics. The crystallization process was mainly affected by the bonding strengths of Si-O and Al-O. When the crystallization temperature increased from 850 to 1000 degrees C, crystallinity increased from 64.5 to 97.3%, Ba2NaNb5O15 and NaNbO3 were precipitated in all samples, and microstructural pores and microcracks gradually appeared. All the results showed that these materials were promising candidates for application in pulse capacitors.

• 出版日期2018-12-14
• 单位同济大学