Structure and Ionic Conductivity of Ga and Nb Dual Doped LLZO Synthesized by Sol-Gel Method

IF 1.1 4区材料科学 Q3 Engineering

Materials Science-Poland Pub Date : 2023-09-01 DOI:10.5755/j02.ms.34240

Jun Li, Fuzhong Wang, Leichao Meng, Tao Gao, Bo Liang, Hang Zhang, Meili Cui, Xinxin Lu, Ying Cao, Jiyong Chen

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引用次数: 0

Abstract

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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溶胶-凝胶法合成Ga和Nb双掺杂LLZO的结构和离子电导率

Li7La3Zr2O12（LLZO）由于其高离子导电性和优异的化学稳定性而受到越来越多的关注。寻找合适的掺杂剂对锁定立方LLZO和提高Li+离子的电导率具有重要意义。溶胶-凝胶合成法可以获得均匀的纳米粉末，有利于保持较高的烧结活性。本工作采用溶胶凝胶法合成了Ga和Nb双掺杂LLZO固体电解质粉末，并采用传统的固态烧结法获得了Ga、Nb双掺杂的LLZO固态电解质陶瓷。采用X射线衍射和扫描电子显微镜相结合的方法，对Ga和Nb共掺杂LLZO固体电解质的相组成和微观结构进行了分析。在电化学工作站上测量了Ga和Nb双掺杂LLZO（Li6.8-3xGaxLa3Zr1.8Nb0.2O12（0≤x≤0.3））固体电解质的阻抗，然后计算了电导率。结果表明，当Ga的掺杂量为x=0.2时，由于样品具有较高的相对密度并达到最佳的Li+空位浓度，它是一种纯立方LLZO结构，最高电导率值为3.7×10-4S cm-1（在室温下测试）。

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来源期刊

Materials Science-Poland 工程技术-材料科学：综合

CiteScore

1.70

自引率

18.20%

发文量

审稿时长

6.2 months

期刊介绍： Material Sciences-Poland is an interdisciplinary journal devoted to experimental research into results on the relationships between structure, processing, properties, technology, and uses of materials. Original research articles and review can be only submitted.