材料科学
离子电导率
电导率
电解质
烧结
陶瓷
微观结构
溶胶凝胶
掺杂剂
兴奋剂
快离子导体
扫描电子显微镜
分析化学(期刊)
相对密度
化学工程
复合材料
纳米技术
色谱法
化学
电极
物理化学
光电子学
工程类
作者
Jun Li,F.L. Wang,Leichao MENG,Tao Gao,Bo Liang,Hang Zhang,Meili CUI,Xinxin Lu,Ying Cao,Jiyong CHEN
出处
期刊:Medžiagotyra
[Kaunas University of Technology (KTU)]
日期:2023-09-01
卷期号:30 (1): 8-13
摘要
More and more attention has been focused on Li7La3Zr2O12 (LLZO) because of the high ionic conductivity and excellent chemical stability. It is great significance to find suitable dopants for locking cubic LLZO and improving the conductivity of Li+ ions. The uniform nano powder can be obtained by the sol gel synthetic method, which is conducive to maintaining high sintering activity. In this work, Ga and Nb dual doped LLZO solid electrolyte powders were synthesized via sol gel method, and Ga and Nb dual doped LLZO solid electrolyte ceramic were obtained via traditional solid state sintering method. The phase and microstructure of Ga and Nb co-doped LLZO solid electrolyte were analyzed by combine X-ray diffraction with scanning electron microscope. The impedance of Ga and Nb dual doped LLZO (Li6.8-3xGaxLa3Zr1.8Nb0.2O12 (0≤x≤0.3)) solid electrolyte was measured by the electrochemical workstation, and then the conductivity was calculated. The results show that when the doping amount of Ga is x=0.2, it is a pure cubic LLZO structure with the highest conductivity value of 3.7×10-4 S cm-1 (tested at room temperature) due to the sample has a high relative density and reaches the optimal Li+ vacancy concentration.
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