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Reduced synthesis temperature and significantly enhanced ionic conductivity for Li6.1Ga0.3La3Zr2O12 electrolyte prepared with sintering aid CuO

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Abstract

Garnet-type Li7La3Zr2O12 (LLZO) is considered as a promising solid electrolyte. However, the synthesis of LLZO often requires a high temperature, which may lead to the evaporation of the lithium and result in a decrease in ionic conductivity. Therefore, it is an important issue how to reduce the synthesis temperature of LLZO and simultaneously increase its ionic conductivity. Herein, we synthesized garnet-type solid electrolytes of Li6.1Ga0.3La3Zr2O12 (LLZO-Ga) with x wt% CuO (x = 0, 0.2, 0.5, 1, 2) by the traditional solid-state reaction method, in which CuO was introduced as a sintering aid to reduce the sintering temperature of LLZO-Ga and increase its Li-ion conductivity. It is found that adding a small amount of CuO as an additive can reduce the sintering temperature from 1100 ℃ to about 1000 ℃. As a result, when the amount of CuO is 0.5 wt%, LLZO-Ga shows the highest room-temperature ionic conductivity and the lowest activation energy, which are 1.111 mS/cm and 0.27 eV, respectively.

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Funding

This work was financially supported by the Ministry of Science and Technology of China (MOST) (Grant No. 2013CB934700), Sichuan Science and Technology Program (Grant No. 2020YFH0047), and the Fundamental Research Funds for Central Universities.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China

    Xin Liu, Yue Jiang, Xing Cheng, Rentai Yan & Xiaohong Zhu

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  1. Xin Liu
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Liu, X., Jiang, Y., Cheng, X. et al. Reduced synthesis temperature and significantly enhanced ionic conductivity for Li6.1Ga0.3La3Zr2O12 electrolyte prepared with sintering aid CuO. Ionics 28, 5071–5080 (2022). https://doi.org/10.1007/s11581-022-04761-7

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