A vapor-phase corrosion strategy to hierarchically mesoporous nanosheet-assembled gearlike pillar arrays for super-performance lithium storage

A facile and low-cost vapor-phase corrosion approach was developed to large-scale controllably fabricate Cu(OH) ₂ hierarchically nanosheet-assembled gearlike pillar arrays (HNGPAs) on a Cu substrate. By further annealing, a novel kind of hierarchical micro/nanostructure electrode was well designed, which consisted of hierarchically mesoporous nanosheet-assembled gearlike pillar arrays (HMNGPAs) active materials (CuO) directly connected to the current substrate (Cu foil). As the integrated anodes for lithium-ion batteries, CuO HMNGPAs exhibited an excellent cycling stability of 651.6 mAh g ^-1 after 100 cycles at 0.5C rate, and high-rate capability of 561.6 mAh g ^-1 at 10C rate. As one example of combining micro/nanostructures concept and metal oxide-based anodes, the strategy of the vapor-phase corrosion provided a new avenue for large-scale configuration of other hierarchically structured materials.