Interconnected porous MnO nanoflakes for high-performance lithium ion battery anodes

Abstract

Interconnected porous MnO nanoflakes on nickel foam were prepared by a reduction of hydrothermal synthesized MnO₂ precursor in hydrogen. The architectures were applied to lithium ion batteries as electrodes. Compared with the as-synthesized MnO₂ anode, porous MnO nanoflakes showed superior cycling stability and rate performance. A high reversible capacity of 568.7 mA h g⁻¹ was obtained at a current density of 246 mA g⁻¹ for the second discharge. It retained a capacity of 708.4 mA h g⁻¹ at the 200th charge–discharge cycle after cycling with various current densities up to 2460 mA g⁻¹ and delivered a capacity of 376.4 mA h g⁻¹ at a current density as high as 2460 mA g⁻¹, indicating that the architecture of the porous MnO nanoflakes grown on Ni foam is a promising electrode for lithium ion batteries.