Comment on “Cycling Li-O 2 batteries via LiOH formation and decomposition”

Based on a simple thermodynamic analysis, we show that iodide-mediated electrochemical decomposition of lithium hydroxide (LiOH) likely occurs through a different mechanism than that proposed by Liu et al . (Research Article, 30 October 2015, p. 530). The mismatch in thermodynamic potentials for iodide/triiodide (I − /I 3 − ) redox and O 2 evolution from LiOH implies a different active iodine/oxygen electrochemistry on battery charge. It is therefore possible that the system described in Liu et al . may not form the basis for a rechargeable lithium-oxygen (Li-O 2 ) battery.