Consolidation of al and Ta-substituted Li7La3Zr2O12 powders with lithium-ion conductivity by spark plasma sintering

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Abstract

Monophase powders of cubic modification with nominal composition Li6.4Al0.2La3Zr2O12 (Al–LLZ) and Li6.52Al0.08La3Zr1.75Ta0.25O12 (Ta–LLZ) were synthesized. Dense (~97–98%) ceramic samples of solid electrolyte with increased stability in air were obtained from these powders by spark plasma sintering. High Li-ion conductivity (4–6×10–4 S/cm) corresponding to the world level have been achieved.

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G. B. Kunshina

Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”

Author for correspondence.
Email: g.kunshina@ksc.ru
Russian Federation, Apatity

I. V. Bocharova

Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”

Email: g.kunshina@ksc.ru
Russian Federation, Apatity

A. А. Belov

Far Eastern Federal University

Email: g.kunshina@ksc.ru
Russian Federation, Vladivostok

O. O. Shichalin

Far Eastern Federal University

Email: g.kunshina@ksc.ru
Russian Federation, Vladivostok

E. K. Papynov

Far Eastern Federal University

Email: g.kunshina@ksc.ru
Russian Federation, Vladivostok

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Supplementary files

Supplementary Files
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2. Fig. 1. Diffraction patterns of Al–LLZO powder after solid-phase annealing at 900°C (a) and 1100°C (b) and after SPS at 1000°C for 10 min (c).

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3. Fig. 2. Diffraction patterns of Al–LLZO powder after IPS at 1000°C for 10 min.

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4. Fig. 3. Diffraction patterns of mechanically activated Al–LLZO powder of cubic modification (a) after annealing at 1000°C and (b) subjected to SPS.

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5. Fig. 4. Electrochemical impedance spectrum of Ta–LLZO after IPS in the range of 103–106 Hz. The inset shows the high-frequency section (105–106 Hz).

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6. Fig. 5. Impedance hodographs of Ta–LLZO samples after SPS (a) and after solid-phase sintering (b). 1 – measured immediately after synthesis, 2 – after 10 days, 3 – after 1 month, 4 – after 2 months of storage in air.

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7. Fig. 6. Chronoamperometric curves for Ta–LLZO after solid-phase sintering (a) and after SPS (b).

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Note

2 Based on the materials of the lecture at the 17th International Meeting “Fundamental and Applied Problems of Solid State Ionics”, Chernogolovka, June 16–23, 2024.


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