Reactions and SEI Formation during Charging of Li-O2 Cells

Jonathan Højberg, Kristian Bastholm Knudsen, Johan Hjelm, Tejs Vegge

Research output: Contribution to journalJournal articleResearchpeer-review


In this letter we combine detailed electrochemical impedance measurements with quantitative measurements of O2 evolution and Li2O2 oxidation to describe the charge mechanisms during charge of Li-O2 batteries with porous carbon electrodes. We identify Li2O2 oxidation at 3.05 V and an apparent chemical formation of a solid electrolyte interface (SEI) layer as the first monolayer of Li2O2 is oxidized, leading to a voltage increase. The first electrochemical degradation reaction is identified between 3.3 V and 3.5 V, and the chemical degradation is limited above 3.5 V, suggesting that a chemically stable SEI layer has been formed.
Original languageEnglish
JournalE C S Electrochemistry Letters
Issue number7
Pages (from-to)A63-A66
Publication statusPublished - 2015


  • Batteries and Energy Storage
  • A


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