Structural Evolution and Ionic Conductivity of Al2O3-Doped LLZO via Single Heat Treatment
This study investigates the synthesis via solid state reaction and characterization of Li₇La₃Zr₂O₁₂ (LLZO) as a solid electrolyte doped with Al₂O₃ using a one-step heat treatment (sintering at 900°C for 4 hours). Samples were prepared with doping variations; pure LLZO (0Al-LLZO), 0.25Al-LLZO, and 0...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Jurusan Fisika, FMIPA Universitas Andalas
2025-06-01
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| Series: | JIF (Jurnal Ilmu Fisika) |
| Subjects: | |
| Online Access: | https://jif.fmipa.unand.ac.id/index.php/jif/article/view/689 |
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| Summary: | This study investigates the synthesis via solid state reaction and characterization of Li₇La₃Zr₂O₁₂ (LLZO) as a solid electrolyte doped with Al₂O₃ using a one-step heat treatment (sintering at 900°C for 4 hours). Samples were prepared with doping variations; pure LLZO (0Al-LLZO), 0.25Al-LLZO, and 0.5Al-LLZO, based on the formula with x = 0, 0.25, and 0.5, and were mixed using ball milling for 4 hours at 25 Hz. XRD and Rietveld refinement confirmed the formation of a dominant tetragonal Li₇La₃Zr₂O₁₂ phase alongside minor secondary phases. Grain sizes ranged from 1.2 to 1.3 µm, and densification improved with increasing Al content. The 0.25Al-LLZO sample exhibited the highest ionic conductivity of 2.83 × 10⁻⁹ S/cm at room temperature, representing a 2.96-fold increase over undoped LLZO. These results indicate that Al doping significantly enhances structural stability and Li-ion transport in LLZO electrolytes processed at moderate temperatures.
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| ISSN: | 1979-4657 2614-7386 |