凯发

Two-dimensional (2-D) materials represent a promising material platform for next-generation energy storage and conversion devices. Owing to their advantageous features of mechanical flexibility, large surface area and open ion transport pathway within 2D layers, graphene and other 2-D transition-metal oxides and phosphates based nanosheets materials show great promise in flexible high-density energy storage devices. Here we will present recent progress on chemically integrated graphene/inorganic hybrid 2-D materials to build high-performance next-generation energy storage devices including Li-ion batteries and supercapacitors. The first set of examples is rationally-integrated hybrid vanadyl phosphate (VOPO4)/graphene and MnO2/graphene nanostructures for ultraflexible solid-state supercapacitors. The other example is chemically integrated mixed-transition-metal oxides/graphene as a promising class of Li-ion battery electrodes with high capacity and rate capability.