A bifunctional MnxCo3-xO4-decorated separator for efficient Li-LiI-O2 batteries: A novel strategy to promote redox coupling and inhibit redox shuttling

• MnxCo 3-x O 4 -decorated separators are firstly introduced into Li-LiI-O 2 batteries. can enhance the kinetics for both I ? /I 3 and redox conversions. efficiently restrain shuttling effect. Using separator improve energy efficiency cell. A concept of battery is proposed as a new hybrid storage model. Although mediator (RM) strategy decrease overpotential in Li-O batteries by tuning electrochemical formation/degradation Li from circumscribed surface pathway to solution one, causes an unexpected RM degradation continuous deterioration anode, finally leading poor cyclability. This work presents first report detailing development novel Mn x Co Benefiting promotion effect nanocages on coupling, cell with as-prepared maintains low charge potential ~3.3 V till death cycling. In addition, shuttling, obvious improvement cycling stability Moreover, contributions LiI performance operation mechanism systematically investigated. These results present promising progress multi-functional materials RM-involved design device.