Ba、Ga共掺杂对石榴石型固态电解质Li7La3Zr2O12显微组织及电导率的影响

doi:10.11896/cldb.19010029

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Abstract 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 (Ga_0.15Ba_x-Li_6.55+xLa_3-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 Li_6.7Ga_0.15La_2.85Ba_0.15Zr₂O₁₂ sample presented a total conductivity σ of 2.11×10^-4 S·cm^-1 at 30 ℃, which was much higher than that of Li_6.55Ga_0.15La₃Zr₂O₁₂ 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.

Key words： Li₇La₃Zr₂O₁₂ garnet-type solid state electrolyte elemental doping electrical conductivity

Published: 15 January 2020

CLC number:

TB34

About author:: Dazhang Dong, received his M.S. degree in June 2019 from Kunming University of Science and Techno-logy, focusing on the research of function ceramic and solid state electrolyte;Bin Meng, received his Ph.D. degree in materials from Harbin Institute of Technology. He has chaired one National Nature Science Foundation of China and other research projects. His research interest is function ceramics.

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	DONG Dazhang
	ZHAO Mengyuan
	XIE Hao
	BIAN Lingfeng
	YANG Xing
	MENG Bin

Cite this article:

DONG Dazhang,ZHAO Mengyuan,XIE Hao, et al. The Role of Ba and Ga Co-doping in Microstructure and Electrical Conductivity of a Garnet-type Solid State Electrolyte Li₇La₃Zr₂O₁₂[J]. Materials Reports, 2020, 34(4): 4001-4006.

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http://www.mater-rep.com/EN/10.11896/cldb.19010029 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4001

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