In Li2MnO3, oxygen migration barriers drop by about 25% when the migrating oxygen carries a hole polaron, and in heavily delithiated material the barrier falls to 0.59-0.76 eV, enabling possible room-temperature oxygen diffusion.
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Hole polaron assisted oxygen ion migration in Li$_2$MnO$_3$
In Li2MnO3, oxygen migration barriers drop by about 25% when the migrating oxygen carries a hole polaron, and in heavily delithiated material the barrier falls to 0.59-0.76 eV, enabling possible room-temperature oxygen diffusion.