Using NiCl2·6H2O

urea

and glucose as materials

hollow microspheres-like NiO were prepared by hydrothermal method followed by annealing in air at 700℃. The results of microstructural characterization reveal that the hollow microspheres-like NiO are composed of nanosized primary particles (50—100 nm). The electrochemical performances of the prepared NiO samples were investigated. It is found that the pseudocapacitive effect has a prominent contribution to the lithium storage capacity of the NiO electrode. Due to the unique hollow structure and pseudocapacitive effect

the NiO electrode shows outstanding electrochemical cycling stability and excellent high rate capability. For example

the NiO electrode retains a high reversible capacity of 650 mA·h·g-1 after 100 cycles at a current density of 500 mA·g-1. Even at ultra-high current density of 10 A·g-1

the NiO electrode can still deliver a capacity of 432 mA·h·g-1.