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Synthesis and Ionic Conductivity of Lithium Titanium Phosphate-Based Solid Electrolytes

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Inorganic Materials Aims and scope

Abstract—

The processes occurring during the solid-state synthesis of germanium-doped lithium titanium phosphate have been studied. The formation of LiTi2 – xGex(PO4)3 has been shown to proceed through the titanium pyrophosphate formation followed by its transformation into materials with the NASICON structure. The process is completed at 1073 K. To produce ceramics with an optimal conductivity, annealing at 1173 K is required. Based on the results obtained, a two-stage synthesis procedure was developed. The highest ionic conductivity (3.9 × 10–5 Ohm–1 cm–1 at 433 K) and the lowest activation energy (46 ± 1 kJ/mol) were observed for LiTi2 – xGex(PO4)3 materials with a titanium substitution degree of 20–25% (x = 0.4–0.5). It can be attributed to an optimal size of lithium transport channels.

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ACKNOWLEDGMENTS

In this study, we used equipment of the JRC PMR IGIC RAS.

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the State Assignment of the Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    E. A. Kurzina, I. A. Stenina & A. B. Yaroslavtsev

  2. Birla Institute of Technology and Science, 333031, Pilani, India

    A. Dalvi

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  1. E. A. Kurzina
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Correspondence to I. A. Stenina.

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Kurzina, E.A., Stenina, I.A., Dalvi, A. et al. Synthesis and Ionic Conductivity of Lithium Titanium Phosphate-Based Solid Electrolytes. Inorg Mater 57, 1035–1042 (2021). https://doi.org/10.1134/S0020168521100071

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