Porous CoO/Co3O4 nanoribbons as a superior performance anode material for lithium-ion batteries

The efficient and stable lithium-ion batteries have inspired extensive interest; however, formidable anode electrode materials still remain a challenge. Herein, porous CoO/Co3O4 nanoribbons were fabricated by a facile hydrothermal and annealing route. The self-assemble ultrathin CoO/Co3O4 nanoribbons are formed by con-nected nano-worms with mesoporous/macroporous structure and oxygen vacancy. The porous ultrathin CoO/ Co3O4 nanoribbons benefit from buffering the volume change and enlarging the contact area between electrode and electrolyte, leading to long cycling life and high specific capacity. Furthermore, oxygen vacancies and a three-dimensional network enhance the internal conductivity and accelerate the diffusion of electrons/ions, resulting in excellent rate performance. The highest discharge capacity (957 mAh/g after 200 cycles at 0.5 A/g) and excellent rate capability (847 mAh/g at 5 A/g) are observed. Thus, these unique characteristics pave the way for CoO/Co3O4 nanoribbons as suitable electrode materials for lithium storage devices.