Enhanced energy storage performance in NBT-based MLCCs via cooperative optimization of polarization and grain alignment

Yang Li, Ningbo Fan, Jie Wu, Bin Xu, Xuexin Li, Xuechen Liu, Yizhou Xiao, Dingwei Hou, Xinya Feng, Jinjing Zhang, Shujun Zhang (), Jinglei Li () and Fei Li ()
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Yang Li: Xi’an Jiaotong University
Ningbo Fan: Soochow University
Jie Wu: Xi’an Jiaotong University
Bin Xu: Soochow University
Xuexin Li: Xi’an Jiaotong University
Xuechen Liu: Xi’an Jiaotong University
Yizhou Xiao: Xi’an Jiaotong University
Dingwei Hou: Xi’an Jiaotong University
Xinya Feng: Xi’an Jiaotong University
Jinjing Zhang: Xi’an Jiaotong University
Shujun Zhang: University of Wollongong
Jinglei Li: Xi’an Jiaotong University
Fei Li: Xi’an Jiaotong University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Dielectric ceramics possess a unique competitive advantage in electronic systems due to their high-power density and excellent reliability. Na1/2Bi1/2TiO3-based ceramics, one type of extensively studied energy storage dielectric, however, often experience A-site element volatilization and Ti4+ reduction during high-temperature sintering. These issues may result in increased energy loss, reduced polarization and low dielectric breakdown electric field, ultimately making it challenging to achieve both high energy storage density and efficiency. To address these issues, we introduce a synergistic optimization strategy that combine polarization engineering and grain alignment engineering. First principles calculations and experimental analyses show that the doping of Mn2+ can suppress the reduction of Ti4+ in Na1/2Bi1/2TiO3-based ceramics and enhance ion off-centering displacements, thereby reducing energy loss and improving polarization. In addition, we prepared multilayer ceramic capacitors with grains oriented along the direction using the template grain growth method. This approach effectively reduces electric-field-induced strain by 37% and markedly enhances breakdown electric field by 42% when compared with nontextured counterpart. As a result of this comprehensive strategy, -textured Na1/2Bi1/2TiO3-based multilayer ceramic capacitors achieve an ultra-high energy density of 15.7 J·cm−3 and an excellent efficiency beyond 95% at 850 kV·cm−1, exhibiting a superior overall energy storage performance.

Date: 2024
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DOI: 10.1038/s41467-024-53287-1

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