Enhancing energy storage efficiency in lead-free dielectric ceramics through relaxor and lattice strain engineering  

作　　者：Xuetian Gong Chao Zhang Dong Su Wenrong Xiao Fangjie Cen Ying Yang Shenglin Jiang Jing Wang Kanghua Li Guangzu Zhang 

机构地区：[1]School of Integrated Circuits,Engineering Research Center for Functional Ceramics MOE and Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan,Hubei,430074,China [2]College of Chemnistry and Materials Science,Hebei University,Baoding,Hebei,071002,China [3]Key Lab of Functional Materials for Electronic Information(B),Ministry of Education,Wuhan,Hubei,430074,China

出　　处：《Journal of Materiomics》2024年第6期1196-1205,共10页无机材料学学报（英文）

基　　金：This work was supported by the National Key Research and Development Program of China(2022YFA1204603);the National Natural Science Foundation of China(Grant No.52372108,52172114,51972126,51972125,62105110,and 52272110);the Shccig-Qinling Program and the Innovation Fund of WNLO,and the Hubei Science and Technology Talent Service Enterprise Program(2023DJC083)。

摘　　要：Dielectric capacitors with high power density and fast charge-discharge speed play an essential role in the development of pulsed power systems.The increased demands for miniaturization and practicality of pulsed power equipment also necessitate the development of dielectric materials that possess high energy density while maintaining ultrahigh efficiency(η).In particular,ultrahigh efficiency signifies minimal energy loss,which is essential for practical applications but challenging to effectively mitigate.Here,we demonstrate a strategy of incorporating heterovalent elements into Ba(Zr_(0.1)Ti_(0.9))O_(3),which contributes to achieving relaxor ferroelectric ceramics and reducing lattice strain,thereby improving the comprehensive energy storage performance.Finally,optimal energy storage performance is attained in 0.85Ba(Zr_(0.1)Ti_(0.9))O_(3)-0.15Bi(Zn_(2/3)Ta_(1/3))O_(3)(BZT-0.15BiZnTa),with an ultrahighηof 97.37%at 440 kV/cm(an advanced level in the lead-free ceramics)and an excellent recoverable energy storage density(Wrec)of 3.74 J/cm^(3).Notably,the BZT-0.15BiZnTa ceramics also exhibit exceptional temperature stability,maintaining fluctuations in Wrec within∼10%andηconsistently exceeding 90% across the wide temperature range of−55℃ to 160℃,and under a high electric field of 250 kV/cm.All these features demonstrate that the relaxor and lattice strain engineering strategies have been successful in achieving high-performance lead-free ceramics,paving the way for designing high-efficiency dielectric capacitors with a wide temperature range.

关 键 词：Energy storage Relaxor ferroelectrics Lead-free ceramics Lattice strain engineering 

分 类 号：TQ174.1[化学工程—陶瓷工业]