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Keywords:

  • electrochemistry;
  • lithium batteries;
  • oxygen;
  • reduction;
  • surface enhanced Raman spectroscopy
Thumbnail image of graphical abstract

Taking the shortcut: Spectroscopic data (see picture) provide direct evidence that in non-aqueous Li+ electrolyte, O2 is reduced to O2, which then forms LiO2 on the electrode surface which disproportionates to Li2O2. On charging, Li2O2 decomposes directly, in a one-step reaction to evolve O2 and does not pass through LiO2 as an intermediate.