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 (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.
董大彰, 赵梦媛, 解昊, 边凌峰, 杨星, 孟彬. 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[J]. 材料导报, 2020, 34(4): 4001-4006.
DONG Dazhang, ZHAO Mengyuan, XIE Hao, BIAN Lingfeng, YANG Xing, MENG Bin. The Role of Ba and Ga Co-doping in Microstructure and Electrical Conductivity of a Garnet-type Solid State Electrolyte Li7La3Zr2O12. Materials Reports, 2020, 34(4): 4001-4006.
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2020, Vol. 34 
