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Lithium ionic conductivity of Li7-3xFexLa3Zr2O12 ceramics by the Pechini method

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Abstract

Li7La3Zr2O12 (LLZO) with garnet structure has been acknowledged as a promising solid electrolyte for the next generation Li-ion batteries owing to its high chemical stability against Li metal and relatively high Li-ion conductivity. In this work, Li7-3xFexLa3Zr2O12 ceramics were prepared by the Pechini method. The influence of Fe substitution on the structure and microstructure of LLZO powder and ceramic were investigated by X-ray diffraction (XRD), TG (DSC)-MS, Raman spectroscopy, scanning electron microscopy (SEM), and impedance spectroscopy. TG-MS and XRD results indicated that LLZO powder could be formed around 750 °C. SEM results showed that the introduction of Fe accelerated densification of LLZO ceramic. The relative density of the composition with x = 0.2 was approximately 95.6%. Its ionic conductivity and activation energy were 4.28 × 10−4 S/cm and 0.27 eV at 30 °C, respectively.

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Funding

This study was supported by the Program for National Natural Science Foundation of China (Grant Nos. 51562029 and 21762031) and Program for Young Talents of Science and Technology in University of Inner Mongolia Autonomous Region (Grant No. NJYT-17-A08).

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  1. Chemical Engineering College, Inner Mongolia University of Technology, Hohhot, 010051, People’s Republic of China

    Zhenzhu Cao, Weiwei Wu, Yue Li, Jiajia Zhao, Weiyan He, Jinrong Liu & Hong Zhang

  2. Key Laboratory of Inorganic Function Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China

    Guorong Li

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  1. Zhenzhu Cao
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  2. Weiwei Wu
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  3. Yue Li
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Cao, Z., Wu, W., Li, Y. et al. Lithium ionic conductivity of Li7-3xFexLa3Zr2O12 ceramics by the Pechini method. Ionics 26, 4247–4256 (2020). https://doi.org/10.1007/s11581-020-03580-y

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