Structural Evolution and Ionic Conductivity of Al2O3-Doped LLZO via Single Heat Treatment

Authors

  • Endah Yuniarti Department of Aeronautical Engineering, Air Chief Marshal Suryadarma Aerospace University, Jalan Protokol Halim Perdana Kusuma Komplek Bandara Halim Perdana Kusuma, Jakarta 13610, Indonesia
  • Slamet Priyono Department of Aeronautical Engineering, Air Chief Marshal Suryadarma Aerospace University, Jalan Protokol Halim Perdana Kusuma Komplek Bandara Halim Perdana Kusuma, Jakarta 13610, Indonesia
  • Simon Sindhu H Department of Aeronautical Engineering, Air Chief Marshal Suryadarma Aerospace University, Jalan Protokol Halim Perdana Kusuma Komplek Bandara Halim Perdana Kusuma, Jakarta 13610, Indonesia
  • Jan Setiawan Research Center of Advanced Material, National Research and Innovation Agency (BRIN), PUSPIPTEK Serpong 15314, Tangerang - Banten, Indonesia
  • Kusdi Prijono 3Advanced Chemical and Advanced Physics Imaging Laboratory - Directorate of Laboratory Management, Research Facilities and Science and Technology, National Research and Innovation Agency (BRIN), PUSPIPTEK Serpong 15314, Tangerang - Banten, Indonesia
  • Brity Femlee R Department of Aeronautical Engineering, Air Chief Marshal Suryadarma Aerospace University, Jalan Protokol Halim Perdana Kusuma Komplek Bandara Halim Perdana Kusuma, Jakarta 13610, Indonesia

DOI:

https://doi.org/10.25077/jif.17.2.157-170.2025

Keywords:

Li₇La₃Zr₂O₁₂, LLZO:Al, Single Heat Treatment , Solid Electrolyte , Ionic Conductivity

Abstract

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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2025-06-06

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Yuniarti, E., Priyono, S., Sindhu Hendradjaja, S., Setiawan, J., Prijono, K., & Femlee R, B. (2025). Structural Evolution and Ionic Conductivity of Al2O3-Doped LLZO via Single Heat Treatment. JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS, 17(2), 157–170. https://doi.org/10.25077/jif.17.2.157-170.2025

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Vol. 17 No. 2 (2025): September 2025

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Research Article

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