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Bifunctional Oxygen Electrocatalysts for Lithium−Oxygen Batteries

Lithium−oxygen batteries have attracted great attention over the last few decades owing to their extraordinarily high theoretical energy density, which can potentially exceed that of current state‐of‐art lithium‐ion batteries. However, lithium−oxygen batteries exhibit poor cycle stability, relativel...

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Bibliographic Details
Published in:Batteries & supercaps 2019-04, Vol.2 (4), p.311-325
Main Authors: Bae, Youngjoon, Park, Hyeokjun, Ko, Youngmin, Kim, Hyunah, Park, Sung Kwan, Kang, Kisuk
Format: Article
Language:English
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Summary:Lithium−oxygen batteries have attracted great attention over the last few decades owing to their extraordinarily high theoretical energy density, which can potentially exceed that of current state‐of‐art lithium‐ion batteries. However, lithium−oxygen batteries exhibit poor cycle stability, relatively low power capability and significantly large polarizations for both, the oxygen reduction reaction (ORR, discharge) and the oxygen evolution reaction (OER, charge). To address these issues, various catalysts for aqueous and non‐aqueous lithium−oxygen batteries have thus been introduced, and some recent developments of bifunctional catalysts could simultaneously facilitate the ORR and OER, leading to great advancements in the overall battery performance. Herein, we present a brief overview of recent progress in the development of bifunctional catalysts for lithium−oxygen batteries based on the current understanding of their working mechanism. Perovskite‐type, spinel‐type, and non‐oxide catalysts and their use in aqueous lithium−oxygen batteries are reviewed. Recently reported bifunctional catalysts in non‐aqueous lithium−oxygen batteries are also introduced, and the different roles of solid‐ and soluble‐type catalysts are further discussed. Finally, we conclude by deliberating the design prospects and perspectives for efficient bifunctional catalysts for future lithium−oxygen batteries. Lithium−oxygen batteries have attracted enormous research interest over the last decade owing to their extremely high theoretical energy density. However, both aqueous and non‐aqueous systems are suffering from poor round‐trip efficiency caused by high polarization during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this regard, the use of bifunctional catalyst that can reduce polarization both on ORR and OER is indispensable for high‐performance lithium oxygen batteries.
ISSN:2566-6223
2566-6223
DOI:10.1002/batt.201800127