Ni/Co Nanoparticles Supported on N-Doped Hollow Carbon Composites as High-Performance Catalysts for Rechargeable Li-O2 Battery

Lithium-oxygen (Li-O2) batteries have become one of the most promising next-generation energy storage systems due to their high theoretical specific capacity. However, Li-O2 still face problem charging voltage incomplete decomposition discharge products. Here, a nitrogen-doped hollow spherical carbon composite containing Ni/Co nanoparticles was prepared by hydrothermal and pyrolysis strategies, used as positive catalyst for adjust morphology product. The porous sphere provides sufficient space Nitrogen-doped nanospheres can change local charge density, improve electron transfer performance, reduce resistivity nanospheres. In addition, abundant M-Nx active groups enhance affinity electrode reaction intermediates, thus regulating product Li2O2. Benefiting from above synergistic advantages, electrochemical performance battery including round-trip efficiency, capacity, cycling stability is greatly improved.