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There is growing demand for practical implementation of lithium–oxygen batteries (LOBs) due to their superior potential for achieving higher energy density than that of conventional lithium-ion batteries. Although recent studies demonstrate the stable operation of 500 Wh kg−1-class LOBs, their cycle life remains fancy. For further improving the cycle performance of LOBs, the complicated chemical degradation mechanism in LOBs must be elucidated. In particular, the quantitative contribution of each cell component to degradation phenomenon in LOBs under lean-electrolyte and high-areal-capacity conditions should be clarified. In the present study, the mass balance of the positive-electrode reaction in a LOB under lean-electrolyte and high-areal-capacity conditions is quantitatively evaluated. The results reveal carbon electrode decomposition to be the critical factor that prevents the prolonged cycling of the LOB. Notably, the carbon electrode decomposition occur during charging at voltages higher than 3.8 V through the electrochemical decomposition of solid-state side products. The findings of this study highlight the significance of improving the stability of the carbon electrode and/or forming Li2O2, which can decompose at voltages lower than 3.8 V, to realize high-energy-density LOBs with long cycle life.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: lithium oxygen battery

刊行年月日: 2023-06-20

出版者: Wiley

掲載誌:

• Advanced Science (ISSN: 21983844) vol. 10 issue. 24 2300896

研究助成金:

• Advanced Low Carbon Technology Research and Development Program
• Japan Science and Technology Agency JPMJAL1301

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/advs.202300896

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更新時刻: 2024-06-20 08:30:31 +0900

MDRでの公開時刻: 2024-06-20 08:30:31 +0900