▎ 摘　　要

Surface area and conductivity are important indexes for the hard carbon as the anode for a sodium-ion battery. Through a different treatment, pine needle derived bulk and micro/nanostructured hard carbons were obtained, respectively. Due to some Na-ions could be stored in the nanopores, the small surface area of the bulk amorphous carbon (1.2 m(2) g(-1)) resulted in a low capacity than that of micro/nanostructure carbon (141 m(2) g(-1)). In order to further improve the performance, rGO coating is employed for the micro/nanostructure carbon by a one-step high temperature annealing process. Due to the enhanced electrical conductivity, the composite displays the capacity of 281 mAh g(-1) at 20 mA g(-1), which is improved by 68%. Well rate performance and long-cycle stability are also obtained. Considering the improved performance and bio-renewable advantage, the micro/nanostructure hard carbon derived from pine needle coated with rGO would be a suitable anode material for SIBs.