Ultrafast Li+ diffusion kinetics enhanced by cross-stacked nanosheets loaded with Co3O4@NiO nanoparticles: Constructing superstructure to enhance Li-ion half/full batteries

Abstract

Novel CoNi binary metal oxide superstructures assembled with cross-stacked nanosheets (Co3O4/NiO/NC) have been successfully prepared by two-step thermal annealing process with CoNi-based and cyano-bridged coordination polymer (CoNiCP). Ascribing to the super decussate structure and as-obtained three-dimensional carbon conductive network, the obtained material exhibited excellent lithium-ion storage capacity including superior cycling stability and rate performance through facilitating the easy electron/ion transport. For example, CoNi binary metal oxide superstructures exhibit an excellent rate capacity of 493 mA h g−1 at 5.0 A g−1 and a long-lifetime cycling performance of 1390 mA h g−1 after 100 cycles at 0.2 A g−1. This strategy may pave a way for designing and preparing binary metal oxide superstructures materials with excellent electrochemical performance for lithium-ion battery by using coordination polymers as the sacrificial template.