The Role of Ba and Ga Co-doping in Microstructure and Electrical Conductivity of a Garnet-type Solid State Electrolyte Li7La3Zr2O12

被引：0
|
作者：
Dong D. [1 ]
Zhao M. [1 ]
Xie H. [1 ]
Bian L. [1 ]
Yang X. [1 ]
Meng B. [1 ]
机构：
[1] Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming
来源：
Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Electrical conductivity; Elemental doping; Garnet-type solid state electrolyte; Li[!sub]7[!/sub]La[!sub]3[!/sub]Zr[!sub]2[!/sub]O[!sub]12[!/sub;
D O I：
10.11896/cldb.19010029
中图分类号：
学科分类号：
摘要：
Ba and Ga co-doped Li7La3Zr2O12 (LLZO), a garnet-type lithium ion solid-state electrolyte was prepared by a two-step approach: synthesis of LLZO powers by conventional solid-state reaction and sintering in the atmosphere. Then, the crystal structure, microstructure, composition distribution and ionic conductivity were characterized by X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and electrochemical impedance spectroscopy. It was found that the cubic phase LLZO could be obtained under the sintering temperature of 1 100℃. When the content of Ga in LLZO was 0.15, and the doping amount of Ba altered from 0 to 0.15 (Ga0.15Bax-Li6.55+xLa3-xZr2O12, x=0-0.15), the LLZO sample exhibited a drop in the average grain size from 14 μm to 4 μm and a rise in the grain boundary conductivity (30℃) from 1.54×10-5 S•cm-1 to 2.22×10-4 S•cm-1. As a kind of sintering agent, the Ba played an critical role in improving the sintering performance, reducing the average grain size, and promoting the bonding between grains in the LLZO samples. Notably, the Li6.7Ga0.15La2.85Ba0.15Zr2O12 sample presented a total conductivity σ of 2.11×10-4 S•cm-1 at 30℃, which was much higher than that of Li6.55Ga0.15La3Zr2O12 sample with single doping of Ga (σ=1.40×10-5 S•cm-1 at 30℃), demonstrating the significant contribution of Ba and Ga co-doping to the Li-ion electrical conductivity of LLZO. © 2020, Materials Review Magazine. All right reserved.
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页码：04001 / 04006
页数：5
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