Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Al and Nb Doping on the Electrochemical Characteristics of Garnet-type Li7La3Zr2O12 Solid Electrolytes

  • Ahmed Tarif (Department of Materials Science and Engineering, Chonnam National University) ;
  • Chan-Jin Park (Department of Materials Science and Engineering, Chonnam National University)
  • Received : 2023.11.10
  • Accepted : 2023.12.07
  • Published : 2023.12.29
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Abstract

In this study, we synthesized and characterized garnet-type Li7-xAlxLa3Zr2-(5/4)yNbyO12 (LALZN) solid electrolytes for all-solid-state battery applications. Our novel approach focused on enhancing ionic conductivity, which is crucial for battery efficiency. A systematic examination found that co-doping with Al and Nb significantly improved this conductivity. Al3+ and Nb5+ ions were incorporated at Li+ and Zr4+ sites, respectively. This doping resulted in LALZN electrolytes with optimized properties, most notably enhanced ionic conductivity. An optimized mixture with 0.25 mol each of Al and Nb dopants achieved a peak conductivity of 1.32 × 10-4 S cm-1. We fabricated symmetric cells using these electrolytes and observed excellent charge-discharge profiles and remarkable cycling longevity, demonstrating the potential for long-term application in battery systems. The garnet-type LALZN solid electrolytes, with their high ionic conductivity and stability, show great potential for enhancing the performance of all-solid-state batteries. This study not only advances the understanding of effective doping strategies but also underscores the practical applicability of the LALZN system in modern energy storage solutions.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the MSIT, Korea (No. 2019R1A2C1084020 and No. 2018R1A5A1025224).

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