Dual heteroatom-doped biomass-derived porous carbon anode for superior sodium storage

The green preparation of anode materials is desirable for high-performance sodium-ion batteries. In this paper, a N/S co-doped porous carbon was prepared from longan shell via a facile and low-cost route. Heteroatom doping increases the defect sites to facilitate Na+ storage and improves the electronic conductivity of the carbon material. The N/S co-doped porous carbon prepared using CS(NH2)2 with a ratio of 1:2 displays the highest specific capacity of 314.7 mAh g-1 after 200 cycles at 0.1 A g-1. In addition, a reversible specific capacity of 202.5 mAh g-1 is maintained after 1000 cycles at 1 A g-1. This work offers a new strategy for designing high-performance anode materials for sodium energy storage applications.