Facile fabrication of binder-free NiO electrodes with high rate capacity for lithium-ion batteries

- The NiO nanocone arrays are fabricated by a simple hydrothermal synthesis and a subsequent thermal oxidation in air.
- The binder-free NiO nanocone array electrode shows excellent rate capacity.
- The cycled NiO electrode well retains its three-dimensional morphology of nanocone array.