Figure 5 : Proposed reaction mechanisms.

From: Effect of the size-selective silver clusters on lithium peroxide morphology in lithium–oxygen batteries

Figure 5

Illustration of two discharge reaction mechanisms based on an initial oxygen reduction at an active site followed by solution phase reactions and growth at a surface nucleation site. (a) Mechanism I: step A: electron transfer to O2; step B: O2 desorption; step C: Li+ reaction with O2 to form solvated LiO2; step D: repetition of steps A–C for LiO2 formation to reach supersaturated LiO2 solution; step E: surface nucleation and growth of LiO2 that undergoes disproportionation. (b) Mechanism II: step A: electron transfer to O2; step B: O2 desorption; step C: Li+ reaction with O2 to form solvated LiO2; step D: addition of O2 and Li+ to form LiO2 dimer; step E: disproportionation to form Li2O2 and O2; step F: repetition of steps A–E for Li2O2 formation to reach supersaturated Li2O2 solution; step G: surface nucleation and growth of Li2O2.