Biomass-derived N/S dual-doped porous hard-carbon as high-capacity anodes for lithium/sodium ions batteries

The N/S dual-doped porous hard-carbon (N/S-PC) material is obtained by simple heat treatment. The N/S-PC material has the characteristics of hierarchical pore structure, high SSA and porous channels. These features can provide more active sites and space for lithium/sodium ion storage, which is conducive to lithium/sodium ion transfer. The N/S-PC material is characterized by instrument and equipment (SEM, TEM, XPS, Raman, XRD). The N1S1 has excellent rate performance and cycle stability. For LIBs anode materials, the capacity remains at 1060 mAh g-1 after 50 cycles, additionally, it has a capacity of 546 mAh g-1 at 5 A g-1. When N1S1 used as SIBs anode, the capacity can reach 801mAh g-1 at 0.1 A g-1 and 402 mAh g-1 at 5 A g-1, it also shows the same cycle stability and electrochemical performance. [Display omitted] •The N/S dual-doped porous carbon has been fabricated from drug residue.•The porous structures of N/S dual-doped porous carbon are interconnected to form a sponge-like structures.•The N/S dual-doped porous carbon exhibits excellent reversibility and cycling stability for LIBs and SIBs.