Hierarchical macro/mesoporous NiO as stable and fast-charging anode materials for lithium-ion batteries

Abstract

A new type of hierarchical macro/mesoporous NiO is prepared from a simple thermolysis of nickel dimethylglyoxime complex, of which the drastic mass loss enables the formation of hierarchical porous structure in the crystalline NiO. The products exhibit excellent performance as anodes for lithium-ion batteries, delivering a remarkable discharge capacities of 911.1 mA h g−1 after 200 charging/discharging cycles at a current density of 0.5 A g−1, and 558 mA h g−1 after 1000 cycles at 2 A g−1. Such superior performance of the materials over other NiO counterparts is associated with markedly reduced internal resistance endowed by a large proportion of macropores in the hierarchical structure.