Nitrogen-doped porous graphene with surface decorated MnO2 nanowires as a high-performance anode material for lithium-ion batteries

Abstract

An effective strategy was developed to prepare a unique composite by growing MnO₂ nanowires on the surface of nitrogen-doped porous graphene (MNPG). The nitrogen-doped porous graphene (NPG) can not only be used as a conductive matrix to greatly improve the conductivity of the MnO₂ nanowires but also serve as the active material contributing lithium storage capacity to the composite. As expected, when evaluated as an anode material for lithium-ion batteries (LIBs), the MNPGs show a highly stable capacity of up to 1132.4 mA h g⁻¹ after 300 cycles at 0.1 A g⁻¹, a capacity higher than 300 mA h g⁻¹ even after 2400 cycles at 1 A g⁻¹ and a good rate capability of 248.5 mA h g⁻¹ even at 10 A g⁻¹, which might open new avenues for the design of high-performance electrode materials.