Hybrid nanostructured MnO2 nanowire/graphdiyne with enhanced lithium-ion performance promoting by interfacial storage

Abstract

Heterostructured hybrid with rationally designed phase hybridization has attracted increasing attention as anode materials of Li-ion battery (LIBs). Herein, the hybrid nanostructured MnO2 nanowire/graphdiyne is successfully synthesized and used as anode material, which achieves enhanced Li-ion storage capacity along with stable cyclic ability. The improved performance originates from the excellent electrical conductivity, more active electrochemical sites and short diffusion length for Li-ion in the hybrid anode. Moreover, there is a significant contribution of pseudocapacitance, which depends on the charge states of interface, high porosity and large surface area of the electrode materials. The density functional theory calculations show that there exists ‘job-sharing’ charge storage mechanism on MnO2 nanowire/graphdiyne interfaces, not only enhancing transport properties but also improving mass storage in the hybrid anode.