Enhanced Energy Storage Properties in Lead-Free (Na0.5Bi0.5)0.7Sr0.3TiO3-Based Relaxor Ferroelectric Ceramics through a Cooperative Optimization Strategy

Wen Wang; Leiyang Zhang; Wenjing Shi; Yule Yang; Denis Alikin; Vladimir Shur; Zhihao Lou; Dong Wang; Amei Zhang; Jinghui Gao; Xiaoyong Wei; Hongliang Du; Feng Gao; Li Jin

doi:10.1021/acsami.2c21969

Enhanced Energy Storage Properties in Lead-Free (Na_0.5Bi_0.5)_0.7Sr_0.3TiO₃-Based Relaxor Ferroelectric Ceramics through a Cooperative Optimization Strategy

ACS Appl Mater Interfaces. 2023 Feb 8;15(5):6990-7001. doi: 10.1021/acsami.2c21969. Epub 2023 Jan 24.

Authors

Wen Wang¹, Leiyang Zhang¹, Wenjing Shi¹, Yule Yang¹, Denis Alikin², Vladimir Shur², Zhihao Lou³, Dong Wang⁴, Amei Zhang⁵, Jinghui Gao⁶, Xiaoyong Wei¹, Hongliang Du⁵, Feng Gao³, Li Jin¹

Affiliations

¹ Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an710049, China.
² School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg620000, Russia.
³ State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an710072, China.
⁴ Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behaviour of Materials, Xi'an Jiaotong University, Xi'an710049, China.
⁵ Multifunctional Electronic Ceramics Laboratory, College of Engineering, Xi'an International University, Xi'an710077, China.
⁶ State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an710049, China.

PMID: 36694407
DOI: 10.1021/acsami.2c21969

Abstract

Although relaxor ferroelectrics have been widely investigated owing to their various advantages, there are still impediments to boosting their energy-storage density (W_rec) and energy-storage efficiency (η). In this paper, we propose a cooperative optimization strategy for achieving comprehensive outstanding energy-storage performance in (Na_0.5Bi_0.5)_0.7Sr_0.3TiO₃ (NBST)-based ceramics by triggering a nonergodic-to-ergodic transformation and optimizing the forming process. The first step of substituting NaNbO₃ (NN) for NBST generated an ergodic state and induced polar nanoregions under the guidance of a phase-field simulation. The second step was to apply a viscous polymer process (VPP) to the 0.85NBST-0.15NN ceramics, which reduced porosity and increased compactness, resulting in a significant polarization difference and high breakdown strength. Consequently, 0.85NBST-0.15NN-VPP ceramics optimized by this cooperative two-step strategy possessed improved energy-storage characteristics (W_rec = 7.6 J/cm³, η = 90%) under 410 kV/cm as well as reliable temperature adaptability within a range of 20-120 °C, outperforming most reported (Na_0.5Bi_0.5) TiO₃-based ceramics. The improved energy-storage performance validates the developed ceramics' practical applicability as well as the advantages of implementing a cooperative optimization technique to fabricate similar high-performance dielectric ceramics.

Keywords: (Na0.5Bi0.5)0.7Sr0.3TiO3; dielectric capacitors; energy storage; phase field simulation; viscous polymer process.