Facile synthesis of hierarchically porous NiO micro-tubes as advanced anode materials for lithium-ion batteries

Hierarchically porous NiO microtubes are synthesized by a high-temperature calcination of Ni(dmg)2 microtubes obtained by a simple precipitation method. The porous NiO microtubes as an anode material for lithium ion batteries exhibit excellent performances, ∼640 mA h g−1 after 200 cycles at 1 A g−1.