Polyimide-coated carbon electrodes combined with redox mediators for superior Li-O 2 cells with excellent cycling performance and decreased overpotential

摘要: We report an air electrode employing polyimide-coated carbon nanotubes (CNTs) combined with a redox mediator for Li-O2 cells enhanced electrochemical performance. The polyimide coating on the surface suppresses unwanted side reactions, which decreases amount of accumulated reaction products during cycling. mediators lower overpotential because they can easily transfer electrons from to products. low also decrease reactions that activate at high potential range. Specifically, CsI effectively interrupted dendrite growth Li anode cycling due shielding effect its Cs+ ions and acted as I- ions. LiNO3 facilitates in stabilization anode. synergic electrolyte containing LiNO3/CsI leads excellent performance (over 250 cycles capacity 1,500 mAh·gelectrode-1).