F-Al双掺杂改性Li_(6.28-x)Al_(0.24)La_(3)Zr_(2)O_(12-x)F_(x)及其性能研究  

F-Al doped modification of Li_(6.28-x)Al_(0.24)La_(3)Zr_(2)O_(12-x)F_(x)and study on its performance

作　　者：吉闫 谢佳磊 张佳熠 刘晶香 陈召勇 JI Yan;XIE Jia-lei;ZHANG Jia-yi;LIU Jing-xiang;CHEN Zhao-yong(School of Physics&Electronic Science,Changsha University of Science&Technology,Changsha 410114,China;School of Materials Science and Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学物理与电子科学学院,湖南长沙410114 [2]长沙理工大学材料科学与工程学院,湖南长沙410114

出　　处：《现代化工》2024年第S02期149-154,共6页Modern Chemical Industry

基　　金：湖南省研究生科研创新项目资助(CX20220961);湖南省大学生创新创业训练计划项目(S202310536196S)。

摘　　要：为提高锂镧锆氧(LLZO)固体电解质的离子电导率和致密度,实现低成本的LLZO陶瓷制备,采用传统固相法制备了F^(-)和Al^(3+)双掺杂改性的固体电解质Li_(6.28-x)Al_(0.24)La_(3)Zr_(2)O_(12-x)F_(x)(LALZOF),并通过调节Al_(2)O_(3)和LiF的添加量以优化LALZOF陶瓷的离子电导率和致密度。SEM、PSD和XRD分析结果表明,F^(-)和Al^(3+)掺杂进入LALZOF中并稳定了立方相,且F^(-)可以降低LALZOF的粉体粒径尺寸。在高温烧结后,SEM、EDS、EIS和致密度测试结果表明,F^(-)对LALZOF陶瓷晶粒的发育具有促进作用,可以增加陶瓷的致密度,并提高锂离子电导率,且F^(-)均匀的掺入在LALZOF晶粒内;在F^(-)掺杂量为0.2 mol时具有最佳性能,致密度为86.28%,总离子电导率为4.30×10^(-4)S/cm。In order to improve the ionic conductivity and relative density of lithium lanthanum zirconium oxide(LLZO)solid electrolyte,and achieve low-cost production of LLZO ceramics,Li_(6.28-x)Al_(0.24)La_(3)Zr_(2)O_(12-x)F_(x)(LALZOF),a solid electrolyte modified with F^(-)and Al^(3+),is synthesized through using a traditional solid phase method.The ionic conductivity and relative density of LALZOF ceramics are optimized by adjusting the adding amount of Al_(2)O_(3)and LiF.It is indicated through SEM,PSD,and XRD analysis that F^(-)and Al^(3+)has been doped into LALZOF and stabilize the cubic phase,and F^(-)can reduce the particle size of LALZOF powder.After high-temperature sintering,it is shown by SEM,EDS,EIS,and relative density tests that the addition of F^(-)can promote the growth of LALZOF ceramics grain,which can enhance densification of the ceramics and improve the ionic conductivity of lithium.Moreover,F^(-)is uniformly doped into LALZOF grains.As F^(-)doping amount is 0.2 mol,LALZOF has the optimal performance,with a density of 86.28%and a total ionic conductivity of 4.30×10^(-4) S·cm^(-1).

关 键 词：固体电解质 锂镧锆氧 双掺杂 氟离子 铝离子 离子电导率 

分 类 号：TM912[电气工程—电力电子与电力传动]