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Although Li-air batteries (LAB) have a high theoretical energy density (3500 Wh kg−1), further developments are required to overcome their practical limitations. Regarding the Li-metal negative electrode (NE), we have previously reported on the reversibility of the Li dissolution/deposition reaction by using Li∣Li symmetric cells with a tetraglyme (G4)-based electrolytic solution. Particularly, in the 1.0 M LiNO3/G4 electrolyte under an O2 atmosphere, a Li2O protective layer is efficiently formed on the Li-metal electrode at a current density of 0.40 mA cm-2, and Li dendrite formation is suppressed. In the present study, we expanded the test conditions (current densities up to 2.0 mA cm-2 and temperatures of 10 to 50 °C) to clarify the dissolution/deposition behavior of the Li-metal NE. The effects of two electrolyte solutions, namely LiTFSI/G4 and LiNO3/G4, on the Li-metal NE were evaluated based on cyclical testing using Li∣Li symmetric cells under an O2 atmosphere. The NEs were also examined by scanning electron microscopy and X-ray photoelectron spectroscopy. The results indicated that not only LiNO3 salt but also the supply of Li and nitrate ions at the Li electrode surface are critical factors in LAB performance.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Li-Air Battery

刊行年月日: 2024-04-20

出版者: Electrochemical Society of Japan

掲載誌:

• ELECTROCHEMISTRY (ISSN: 13443542)

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.5796/electrochemistry.23-00142

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更新時刻: 2024-04-20 08:30:08 +0900

MDRでの公開時刻: 2024-04-20 08:30:09 +0900