High performance NiO microsphere anode assembled from porous nanosheets for lithium-ion batteries

3D NiO microspheres assembled from porous nanosheets were fabricated, showing an excellent electrochemical performance in a lithium ion battery (reversible discharge capacity: up to 820 mA h g⁻¹ after 100 cycles at 100 mA g⁻¹; rate capacity: 634 mA h g⁻¹ at 1 A g⁻¹).