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Enhancement of ionic conductivity in Li0.5La0.5TiO3 with Ag nanoparticles

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Abstract

Li0.5La0.5TiO3 (LLTO)/nano-Ag composite electrolytes were synthesized by a sol–gel process. Through the addition of nano-Ag powder with a relatively low melting point, the lattice parameter, grain size and morphology of LLTO-based electrolytes were tailored. The results revealed that Ag was oxidized into Ag+ during high-temperature sintering in air, and partial Ag+ entered into LLTO lattice and improved the bulk ionic conductivity. Meanwhile, owing to the liquid-phase-assisted grain growth induced by Ag, the grain size of LLTO was increased and the grain boundary conductivity was substantially improved. As a consequence, the bulk and grain boundary conductivities of LLTO were simultaneously enhanced through a facile nano-Ag combination, thereby leading to the highest total conductivity of 4.2 × 10−5 S/cm in the sample with 5 wt% Ag, which is remarkably superior to that (2.8 × 10−5 S/cm) of pure LLTO.

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Acknowledgements

This work was financially supported by the Ministry of Science and Technology of China (MOST) (Grant No. 2013CB934700), the Key Research and Development Project of Sichuan Province, China (Grant No. 2017GZ0396), and the Fundamental Research Funds for Central Universities.

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  1. Ming’en Ling, Yue Jiang and Yi Huang have contributed equally to this work.

Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, People’s Republic of China

    Ming’en Ling, Yue Jiang, Yi Huang, Yuxi Zhou & Xiaohong Zhu

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  1. Ming’en Ling
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Ling, M., Jiang, Y., Huang, Y. et al. Enhancement of ionic conductivity in Li0.5La0.5TiO3 with Ag nanoparticles. J Mater Sci 55, 3750–3759 (2020). https://doi.org/10.1007/s10853-019-04180-6

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