通过弛豫性调控BaTiO_(3)基陶瓷的储能性能  

Enhancing Energy Storage Performance of BaTiO_(3)-Based Ceramics through Relaxor Regulation

作　　者：胡佳文 汤罗蒙 杨海辰 吴鲁康 刘进军[1] 潘仲彬 HU Jiawen;TANG Luomeng;YANG Haichen;WU Lukang;LIU Jinjun;PAN Zhongbin(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,Zhejiang,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《硅酸盐学报》2024年第4期1384-1391,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51902167)。

摘　　要：BaTiO_(3)(BT)作为一种典型的无铅铁电陶瓷被广泛的研究,然而大的剩余极化以及施加电场后的极化翻转损耗限制其进一步应用。通过在BT陶瓷中引入Bi_(0.5)Na_(0.5)TiO_(3)–Sr_(0.7)La_(0.2)TiO_(3)(BNT–SLT)组元调控弛豫性,从而实现高的储能性能。研究结果表明,随着BNT–SLT含量的增加,BT陶瓷的弛豫性明显提高。因此,0.55BT–0.45(BNT–SLT)陶瓷在低电场280 kV/cm时实现了高的储能密度:Wrec约为3.12 J/cm^(3)和效率η约为93.3%。同时,该陶瓷具有优异的频率稳定性、温度稳定性及疲劳特性。以上结果表明,经过弛豫性调控的BT基铁电陶瓷在储能领域有着巨大的应用潜力。Introduction In recent years,relaxor ferroelectrics(RFE)ceramics are recognized as materials with a tremendous potential for energy storage applications.Their relaxor characteristics significantly contribute to enhancing the energy storage performance of ceramics.BaTiO_(3)(BT)as a typical lead-free ferroelectric ceramic is popular due to its immense dielectric constant and long-range ordered spontaneous polarization.This ceramic is extensively investigated and applied in dielectric capacitor materials.However,pure BT materials often exhibit a large residual polarization and a considerable energy loss due to polarization reversal upon the application of an electric field,affecting the further development of BT materials in energy storage.To optimize the energy storage performance of the original BT ceramics,effective methods such as compositional modulation and ionic doping are proposed.The objective of this paper was to disrupt an original long-range ordered ferroelectric domain structure,creating nano-sized polar nanodomains.This could accelerate the polarization response speed and enhance the relaxor behavior of ferroelectrics.Methods(1–x)BT–x(BNT–SLT)ceramics were synthesized by a solid-state reaction method.Na_(2)CO_(3)(purity:99.500%,in mass fraction,the same below),BaCO_(3)(purity:99.000%),Bi_(2)O_(3)(purity:99.975%),SrCO_(3)(purity:99.000%),TiO_(2)(purity:99.000%)and La_(2)O_(3)(purity:99.000%)were used as raw materials.These materials were dried and mixed in stoichiometric proportions.The mixture was then ground with anhydrous ethanol in a grinding mill with zirconium dioxide balls in a mass ratio of 1.0:2.5:4.0 for 12 h.After grinding,the slurry was dried at 100℃for 12 h.The dried materials were subsequently ground using an agate mortar for over half an hour.The ground materials were firstly transferred and compacted in an alumina crucible,pre-sintered in a box furnace at 850℃for 2 h,and then cooled naturally to room temperature.The powder obtained from the second pre-sintering was further grou

关 键 词：钛酸钡陶瓷 弛豫性 储能密度 效率 

分 类 号：TQ174[化学工程—陶瓷工业]