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Preparation and enhancement of ionic conductivity in Al-added garnet-like Li6.8La3Zr1.8Bi0.2O12 lithium ionic electrolyte

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Abstract

Garnet-like Li6.8La3Zr1.8Bi0.2O12 (LLZBO) + x mol.% Al2O3 (x = 0, 1.25, 2.50) lithium ionic electrolytes were prepared by conventional solid state reaction method under two different sintering temperatures of 1000°C and 1100°C. XPS, induced coupled plasma optical emission spectrometer (ICP-OES), XRD and AC impedance spectroscopy were applied to investigate the bismuth valance, lithium concentration, phase structure and lithium ionic conductivity, respectively. Electrical measurement demonstrated that ionic conductivity of Al-added LLZBO compounds could be obviously improved when the sample sintering temperature increased from 1000°C to 1100°C. The highest ionic conductivity 6.3×10-5 S/cm was obtained in the LLZBO-1.25%Al sample sintered at 1100°C, in consistent with the lowest activation energy 0.45 eV for the lithium ion migration. The mechanism related with good ionic conductivity in the Al-added LLZBO sample was attributed to the lattice distortion induced by the partial Al substitution at Zr sites, which is helpful to improve the migration ability of Li ions in lattice.

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Authors and Affiliations

  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Yu Xia, Liang Ma, Hui Lu, Xian-Ping Wang, Yun-Xia Gao, Wang Liu, Zong Zhuang, Li-Jun Guo & Qian-Feng Fang

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  1. Yu Xia
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  2. Liang Ma
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  3. Hui Lu
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  4. Xian-Ping Wang
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  5. Yun-Xia Gao
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  6. Wang Liu
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  7. Zong Zhuang
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  8. Li-Jun Guo
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  9. Qian-Feng Fang
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Correspondence to Xian-Ping Wang.

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Xia, Y., Ma, L., Lu, H. et al. Preparation and enhancement of ionic conductivity in Al-added garnet-like Li6.8La3Zr1.8Bi0.2O12 lithium ionic electrolyte. Front. Mater. Sci. 9, 366–372 (2015). https://doi.org/10.1007/s11706-015-0308-6

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  • DOI: https://doi.org/10.1007/s11706-015-0308-6

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