Ultrahigh Energy Storage Density in a Lead-Free Bi0.5Na0.5TiO3-Based Relaxor Ferroelectric Ceramics under Moderate Electric Fields by Manipulating Phase Fraction

IF 6.1 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2024-12-20 DOI:10.1039/d4qi02642j

Jiangtao fan, Lingxiang Wang, Jiaxin Wang, Zheng Chen, Langxiang Zhong, Tiantian Yang, Zhanggui Hu

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Abstract

Since electronic devices deteriorate when used in extremely high electric fields, it is essential to explore the potential for dielectric capacitors with high energy density in medium electric fields (MEFs). In this account, a polymorphic multiscale domains construction strategy is suggested to optimize the energy storage performance (ESPs) of (1-x)Bi0.5Na0.5TiO3-xCa(Ta0.5Al0.5)O3(xCTA, x=0, 0.05, 0.1, 0.15, 0.2) under MEFs. The symbiosis of rhombic (R) + tetragonal (T) phase polar nanoregions (PNRs) is achieved through the design of Ca2+ and (Ta5+ + Al3+)4+ doping to phase ratios. This yielded in a significant recoverable energy density (Wrec) of 5.89 J cm-3 and an efficiency () of 87.4% at 370 kV cm-1 for 0.15CTA ceramic. In addition, the 0.15CTA ceramic exhibits excellent ESP stability (30 ~ 200°C and 1-200 Hz), and also achieves ultra-high power density (154 MW cm-3) and fast discharge time (54.07 ns). This work gives a promising method to boost the ESP of ceramic capacitors at MEFs.

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