{"title":"Excellent energy-storage performance in BNT-BT lead-free ceramics through optimized electromechanical breakdown","authors":"Liang Wang, Wenjun Cao, Cen Liang, Changyuan Wang, Hanyu Zhao, Chunchang Wang","doi":"10.1016/j.mtphys.2024.101545","DOIUrl":null,"url":null,"abstract":"<div><p>Dielectric capacitors with high recoverable energy storage density (<em>W</em><sub>rec</sub>) are in urgent demand for clean energy technologies. However, their lower breakdown strength (<em>E</em><sub>b</sub>) strongly limits their energy storage performance. We, herein, propose a facile method to enhance <em>E</em><sub>b</sub> by enhancing mechanical strength via second phase modulation. The efficiency of this method is validated in the (1-<em>x</em>)(0.94Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-0.06BaTiO<sub>3</sub>)-<em>x</em>Sr(Ta<sub>0.5</sub>Sb<sub>0.5</sub>)O<sub>3</sub> ((BNT-BT)-<em>x</em>STS, <em>x</em> = 0.1, 0.15, 0.2, 0.25, and 0.3) ceramics. The introduction of Sr(Ta<sub>0.5</sub>Sb<sub>0.5</sub>)O<sub>3</sub> (STS) increases the relaxor degree, refines grain size, and most importantly, creates a second phase of BiSb<sub>2</sub>O<sub>7</sub>, which hinders dislocation movement and improves mechanical strength. Our results show that the breakdown strength strongly depends on the mechanical strength. The highest hardness of 7.42 GPa accompanied by the largest <em>E</em><sub>b</sub> of 620 kV/cm was obtained in (BNT-BT)-0.25STS sample. The sample exhibits the best energy storage properties of a large <em>W</em><sub>rec</sub> = 8.3 J/cm<sup>3</sup>, a high efficiency of 82.3 %, and excellent temperature/frequency stability. Furthermore, the sample also exhibits good charge/discharge stability and ultra-fast transient discharge time (62.26 ns). This work provides a theoretical guidance for developing lead-free dielectrics with superior energy-storage performance.</p></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"47 ","pages":"Article 101545"},"PeriodicalIF":10.0000,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Today Physics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2542529324002219","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Dielectric capacitors with high recoverable energy storage density (Wrec) are in urgent demand for clean energy technologies. However, their lower breakdown strength (Eb) strongly limits their energy storage performance. We, herein, propose a facile method to enhance Eb by enhancing mechanical strength via second phase modulation. The efficiency of this method is validated in the (1-x)(0.94Na0.5Bi0.5TiO3-0.06BaTiO3)-xSr(Ta0.5Sb0.5)O3 ((BNT-BT)-xSTS, x = 0.1, 0.15, 0.2, 0.25, and 0.3) ceramics. The introduction of Sr(Ta0.5Sb0.5)O3 (STS) increases the relaxor degree, refines grain size, and most importantly, creates a second phase of BiSb2O7, which hinders dislocation movement and improves mechanical strength. Our results show that the breakdown strength strongly depends on the mechanical strength. The highest hardness of 7.42 GPa accompanied by the largest Eb of 620 kV/cm was obtained in (BNT-BT)-0.25STS sample. The sample exhibits the best energy storage properties of a large Wrec = 8.3 J/cm3, a high efficiency of 82.3 %, and excellent temperature/frequency stability. Furthermore, the sample also exhibits good charge/discharge stability and ultra-fast transient discharge time (62.26 ns). This work provides a theoretical guidance for developing lead-free dielectrics with superior energy-storage performance.
期刊介绍:
Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.