Reversible LiOH chemistry in Li-O2 batteries with free-standing Ag/δ-MnO2 nanoflower cathode

The low energy efficiency and poor cycle stability arising from the high aggressivity of discharge products toward organic electrolytes limit practical applications Li-O2 batteries (LOBs). Compared with typical product Li2O2, LiOH shows better chemical electrochemical stability. In this study, a free-standing cathode composed hydrangea-like δ-MnO2 Ag nanoparticles (NPs) embedded in carbon paper (CP) (Ag/δ-MnO2@CP) is fabricated used as catalyst for reversible formation decomposition LiOH. possible mechanism investigated by situ Raman measurement density functional theory calculation. Results confirm that dominantly catalyzes conversion reaction intermediate LiO2* to particles promote its catalytic ability. presence Ag/δ-MnO2@CP cathode, LOB exhibits enhanced specific capacity voltage plateau under humid O2 atmosphere. At current 200 mA g−1, presents an overpotential 0.5 V ultra-long life 867 cycles limited 500 h g−1. This work provides fresh view on role solid catalysts LOBs promotes development based applications.