Green and Facile Synthesis of Porous Hierarchical Cr2O3/N-doped Carbon Composite with High Li-Ion Battery Anodic Performance

A green and facile bio-template method was developed to synthesize porous hierarchical Cr2O3/Ndoped carbon (denoted as Cr2O3/NC) composite using egg-shell membrane as template and carbon source. The as-prepared Cr2O3/NC composite is assembled from interwoven and coalesced porous microfibers. The microfibers are constructed by Cr2O3 nanoparticles uniformly encapsulated 1D porous N-doped carbon matrix. Importantly, the as-prepared Cr2O3/NC electrode shows a superior Li-ion battery anodic performance. Under a current density of 100 mA g(-1), the Cr2O3/NC sample has a specific discharge capacity of 640 mA h g(-1) after 100 cycles. Moreover, after 50 cycles at a high current density of 1000 mA g(-1), the sample exhibits a discharge capacity of 368 mA h g(-1). The outstanding Li-storage performance of the composite should be attributed to the stable porous hierarchical structure, large specific surface area and highly conductive N-doped carbon matrix.