Ordered Adsorption of Oxygen via High-Density Low-Coordinated Ru Sites for Lithium–Oxygen Battery

Lithium–oxygen batteries (LOBs), despite high-energy densities, generally suffer from poor cycling performances, which put severe constraints on their commercialization. Herein, we demonstrate a cathode catalyst featuring a hollow structure with high-density, low-coordinated Ru active sites. The high-density low-coordinated Ru active sites could efficiently activate oxygen via bridge-adsorption configuration, and the hollow architecture could optimize the access of oxygen to the active sites and accommodate more Li2O2. These structural features could direct the Li2O2 to grow along the (010) faces into a unique highly dispersed fluff-like morphology, which could be readily decomposed in charge process, thereby conferring a long battery stability under high-rate current, the LOB capable of running stably for >700 cycles under the high-rate current density of 1 A·g–1.