Download file (7.74 MB)
Download as zip (7.12 MB)

Collection

Citation

Description:

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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

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

Date published: 2026-01-26

Publisher: American Chemical Society (ACS)

Journal:

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

Funding:

• 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

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acsaem.5c02972

Related item:

Other identifier(s):

Contact agent:

Updated at: 2026-01-30 16:30:12 +0900

Published on MDR: 2026-01-30 13:53:20 +0900