Anionic vacancy-dependent activity of the CoSe 2 with a tunable interfacial electronic structure on the N-doped carbon cloth for advanced Li–O 2 batteries

The inferior reversibility of the formation/decomposition of the lithium peroxide (Li ₂ O ₂ ) and its insolubility and insulation features result in poor energy efficiency and limited durability of state-of-the-art Li–O ₂ batteries.