Graphene@Nanoporous Nickel Cathode for Li−O 2 Batteries

Li−O 2 batteries are a promising electrochemical energy‐storage system with a sufficient energy density for all electric vehicles, with a one‐charge driving distance comparable to conventional petrol cars. However, the practical implementations of Li−O 2 batteries face many scientific and technological challenges. Among these is the development of high‐performance cathode materials that can provide high capacity, low charge/discharge overpotentials and stable cycling stability. Here, we report a nanoporous Ni cathode covered by N‐doped graphene and self‐grown catalyst for rechargeable Li−O 2 batteries. The novel hybrid cathode shows relatively low charge/discharge overpotentials, high volumetric capacity and long cycling lifetime, which may pave a new way for practical implementation of economic nanoporous metals as binder‐free cathodes for high‐performance Li−O 2 batteries.