Broad-high operating temperature range and enhanced energy storage performances in lead-free ferroelectrics

Weichen Zhao, Diming Xu (), Da Li, Max Avdeev, Hongmei Jing, Mengkang Xu, Yan Guo, Dier Shi, Tao Zhou, Wenfeng Liu, Dong Wang () and Di Zhou ()
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Weichen Zhao: Xi’an Jiaotong University
Diming Xu: Xi’an Jiaotong University
Da Li: Xi’an Jiaotong University
Max Avdeev: Australian Nuclear Science and Technology Organization
Hongmei Jing: Shaanxi Normal University
Mengkang Xu: Xi’an Jiaotong University
Yan Guo: Xi’an Jiaotong University
Dier Shi: Zhejiang University
Tao Zhou: Hangzhou Dianzi University
Wenfeng Liu: Xi’an Jiaotong University
Dong Wang: Xi’an Jiaotong University
Di Zhou: Xi’an Jiaotong University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The immense potential of lead-free dielectric capacitors in advanced electronic components and cutting-edge pulsed power systems has driven enormous investigations and evolutions heretofore. One of the significant challenges in lead-free dielectric ceramics for energy-storage applications is to optimize their comprehensive characteristics synergistically. Herein, guided by phase-field simulations along with rational composition-structure design, we conceive and fabricate lead-free Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3-Sr(Sc0.5Nb0.5)O3 ternary solid-solution ceramics to establish an equitable system considering energy-storage performance, working temperature performance, and structural evolution. A giant Wrec of 9.22 J cm−3 and an ultra-high ƞ ~ 96.3% are realized in the BNKT-20SSN ceramic by the adopted repeated rolling processing method. The state-of-the-art temperature (Wrec ≈ 8.46 ± 0.35 J cm−3, ƞ ≈ 96.4 ± 1.4%, 25–160 °C) and frequency stability performances at 500 kV cm−1 are simultaneously achieved. This work demonstrates remarkable advances in the overall energy storage performance of lead-free bulk ceramics and inspires further attempts to achieve high-temperature energy storage properties.

Date: 2023
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DOI: 10.1038/s41467-023-41494-1

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