F-Al双掺杂改性Li6.28-xAl0.24La3Zr2O12-xFx及其性能研究
F-Al doped modification of Li6.28-xAl0.24La3Zr2O12-xFx and study on its performance
吉闫 1谢佳磊 2张佳熠 2刘晶香 2陈召勇2
作者信息
- 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
- 折叠
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Al3+双掺杂改性的固体电解质Li6.28-xAl0.24La3Zr2O12-xFx(LALZOF),并通过调节Al2O3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Al3+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.
Abstract
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,Li6.28-xAl0.24La3Zr2O12-xFx(LALZOF),a solid electrolyte modified with F and Al3+,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 Al2O3 and LiF.It is indicated through SEM,PSD,and XRD analysis that F-and Al3+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Key words
solid electrolyte/lithium lanthanum zirconium oxygen/dually doping/fluoride ion/aluminum ion/ionic conductivity引用本文复制引用
基金项目
湖南省研究生科研创新项目(CX20220961)
湖南省大学生创新创业训练计划项目(S202310536196S)
出版年
2024
NETL
NSTL
万方数据