N-doped egg-box-like porous carbons with superior rate capacities for lithium/sodium ions storage

N-doped egg box-like porous carbons (N/Cs) were prepared through high temperature activation method. The prepared N/Cs were porous multi-layer nanosheets . The N/Cs were characterized by instruments and equipment (SEM, TEM , XPS , Raman, XRD). Benefiting from structural advantages, N/C-1 exhibits excellent reversible capacity (561 mAh g −1 at 0.1 A g −1 after 100 cycles) and outstanding cycling stability (257 mAh g −1 at 5 A g −1 after 500 cycles) for lithium ion batteries (LIBs). Meanwhile, it displays a high capacity (486 mAh g −1 at 0.1 A g −1 after 100 cycles) and remarkable cycling stability (194 mAh g −1 at 5 A g −1 after 500 cycles) for sodium ion batteries (SIBs). Such study opens an economical and clean method to synthesize carbon materials with excellent electrochemical properties .