Hierarchically Porous and Nitrogen‐Doped Graphene‐Like Microspheres as Stable Anodes for Lithium‐Ion Batteries

Abstract

Abstract Novel 3D hierarchically porous and nitrogen‐doped graphene‐like microspheres (3D NPGSs) are prepared by precursor‐assisted chemical vapor deposition. 3D NPGSs obtained by using Ni microspheres as a structural template exhibit a 3D conductive framework, and have a well‐defined porous structure, large surface area and appropriate heteroatom doping, making them suitable for high‐performance storage of lithium ions. Consequently, a good rate capability and excellent cycle performance are achieved using the 3D NPGSs as anodes for lithium storage, and a high reversible capacity of 840 mA h g −1 is obtained after 200 cycles. For a further capacitance boost, a thin layer of iron oxide nanoparticles is deposited onto the 3D NPGSs. The resulting 3D FeO x –NPGS electrode exhibits a stable reversible capacity up to 1343 mA h g −1 after 100 cycles.