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Effect of Al and Nb Doping on the Electrochemical Characteristics of Garnet-type Li7La3Zr2O12 Solid Electrolytes

Ahmed Tarif|Chan-Jin Park
한국재료부식학회 (The Corrosion Science Society of Korea)|2023.12|CORROSION SCIENCE AND TECHNOLOGY|제22권 제6호|pp. 408-418|DOI 10.14773/cst.2023.22.6.408

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참고문헌

키워드

Ionic conductivitySolid electrolyteDopingGarnetSolid-state batteries
주제분류금속공학

초록

In this study, we synthesized and characterized garnet-type Li 7-x Al x La 3 Zr 2-(5/4)y NbyO 12(LALZN) solid elec-trolytes for all-solid-state battery applications. Our novel approach focused on enhancing ionic conduc-tivity, which is crucial for battery efficiency. A systematic examination found that co-doping with Al andNb significantly improved this conductivity. Al 3+ and Nb 5+ ions were incorporated at Li + and Zr 4+ sites,respectively. This doping resulted in LALZN electrolytes with optimized properties, most notablyenhanced ionic conductivity. An optimized mixture with 0.25 mol each of Al and Nb dopants achieved apeak conductivity of 1.32 × 10 -4 S cm -1 . We fabricated symmetric cells using these electrolytes andobserved excellent charge-discharge profiles and remarkable cycling longevity, demonstrating the poten-tial for long-term application in battery systems. The garnet-type LALZN solid electrolytes, with their highionic conductivity and stability, show great potential for enhancing the performance of all-solid-state bat-teries. This study not only advances the understanding of effective doping strategies but also underscoresthe practical applicability of the LALZN system in modern energy storage solutions.

Abstract

In this study, we synthesized and characterized garnet-type Li 7-x Al x La 3 Zr 2-(5/4)y NbyO 12(LALZN) solid elec-trolytes for all-solid-state battery applications. Our novel approach focused on enhancing ionic conduc-tivity, which is crucial for battery efficiency. A systematic examination found that co-doping with Al andNb significantly improved this conductivity. Al 3+ and Nb 5+ ions were incorporated at Li + and Zr 4+ sites,respectively. This doping resulted in LALZN electrolytes with optimized properties, most notablyenhanced ionic conductivity. An optimized mixture with 0.25 mol each of Al and Nb dopants achieved apeak conductivity of 1.32 × 10 -4 S cm -1 . We fabricated symmetric cells using these electrolytes andobserved excellent charge-discharge profiles and remarkable cycling longevity, demonstrating the poten-tial for long-term application in battery systems. The garnet-type LALZN solid electrolytes, with their highionic conductivity and stability, show great potential for enhancing the performance of all-solid-state bat-teries. This study not only advances the understanding of effective doping strategies but also underscoresthe practical applicability of the LALZN system in modern energy storage solutions.

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