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説明:

Lithium-air battery (LAB) provides high-energy density batteries, but the slow oxygen reduction reaction kinetics have virtually limited its discharge only under pure oxygen atmosphere with extremely low power output. Herein, to boost the power and energy under atmospheric oxygen, we investigated the discharge performance of LAB cells with low-viscosity amide-based electrolytes, N,N-dimethyl acetamide (DMA) and N,N-dimethyl formamide (DMF) dissolving lithium nitrate (LiNO3) or lithium bis(trifluloromethanesulfonyl)imide (LiTFSI). The 1/3~1/4 lower viscosity than the typical LAB electrolyte solvent of tetraethyleneglycol dimethylether (TEG) ensures fast oxygen and Li+ supply to enhance the battery power. Raman spectroscopy revealed less solvation in LiNO3 electrolytes, explaining the lower viscosity with slightly lower ion conductivity than LiTFSI electrolytes, which was more evident in DMF. As the result, LAB cells with DMF dissolving LiNO3 (DMF-NO3) enabled the highest current density discharge of 23 mA cm-2 with 2.2 mAh cm-2 capacity under dry-air, which demonstrates an engine like power of 2200 W kg-1 providing 210 Wh kg-1 energy. Meanwhile, galvanostatic discharge-charge cycle test revealed better cyclability in DMA electrolytes due to the less solvent volatilization behavior. Anions mixing effectively suppressed the volatilization with reducing the side reactions, providing 200 Wh kg-1 energy for 14 times. Because of the mild oxidation condition, LAB cells extended the rechargeability under dry-air, rather than under pure oxygen. This work paves the way for developing “true”-LAB that works by air oxygen.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: lithium−air battery, amide-based electrolyte, solvation, atmospheric oxygen, highly porous cathode, high power density, high energy density

刊行年月日: 2026-01-26

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Energy Materials (ISSN: 25740962) vol. 9 issue. 2 p. 827-841

研究助成金:

• Adaptable and Seamless Technology Transfer Program through Target-Driven R and D JPMJTM22AQ
• Japan Society for the Promotion of Science 24K08154
• Japan Society for the Promotion of Science 24K08585
• National Institute for Materials Science
• JKA Foundation 2024M-380

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acsaem.5c02972

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更新時刻: 2026-01-30 16:30:12 +0900

MDRでの公開時刻: 2026-01-30 13:53:20 +0900