Suppressing interfacial polarization via entropy increase strategy for superior energy-storage performance of Na_(0.5)Bi_(0.5)TiO_(3)-based ceramics  

作　　者：Hanyu Zhao Wenjun Cao Donghao Han Xiyue Zhu Cen Liang Changyuan Wang Chunchang Wang 

机构地区：[1]Laboratory of Dielectric Functional Materials,School of Physics&Materials Science,Anhui University,Hefei,230601,China

出　　处：《Journal of Materiomics》2024年第4期947-955,共9页无机材料学学报（英文）

基　　金：The authors acknowledge financial support from the National Natural Science Foundation of China(NSFC)with grant Nos.12174001 and 51872001.

摘　　要：High entropy engineering has emerged as a new strategy to improve the energy storage density and efficiency of dielectric capacitors due to its unique design concept.However,the recyclable energy storage density(Wrec)reported so far has never exceeded 2 J/cm^(3) for the type of high-entropy ceramics with equimolar elements occupying A or B site.In order to improve this type high-entropy ceramics.Na_(0.5)Bi_(0.5)TiO_(3)(NBT)was used as the matrix,equimolar Sr^(2+),La^(3+),K^(+)and Ba^(2+)were gradually introduced into at the A-site of the matrix lattice to increase configurational entropy.The results show that the relaxor degree,band gap width,interfacial polarization,and breakdown field strength are effectively improved with increasing entropy.Among them,suppressing interfacial polarization is an important factor to increase the breakdown field strength and thus enhance the energy storage performance.The(Na1/6Bi1/6Sr1/6La1/6K1/6Ba1/6)TiO_(3)(NBSLKBT)sample with the highest configurational entropy shows an ultra-high Wrec of 9.8 J/cm^(3) and the energy storage efficiency(η=86.5%).This work demonstrates that entropy strategy for superior energy-storage performance still works on the above type high-entropy ceramics and opens up a new way of modulating interface polarization by entropy increase strategy.

关 键 词：High entropy ceramics Energy storage Interfacial polarization Configurational entropy 

分 类 号：TQ174.1[化学工程—陶瓷工业]