文摘
Fruit waste pomelo peel was employed as raw material to prepare a highly porous and partial graphitized carbon material (pomelo peel-derived carbon (PPDC)). Se/PPDC nanocomposite was fabricated through ball milling and melt diffusion of selenium and PPDC mixture powder. The characterization results showed that selenium with 47 % loading content were confined homogenously in the small pores (<4 nm) of the PPDC matrix. As a novel cathode material for rechargeable lithium batteries, Se/PPDC exhibited high specific capacity, good cycling stability, and C-rate performance when using sodium alginate (SA) as binder and low-cost LiPF6-EC-DEC as electrolyte. During the initial 30 cycles, a steady capacity of 650 mAh g? approaching to theoretic specific capacity was obtained at a current density of 150 mA g?. At a high current density of 900 mA g?, Se/PPDC delivered a reversible capacity of 410 mAh g? with nearly 100 % coulombic efficiency. The advanced electrochemical performance of Se/PPDC demonstrated that PPDC would be a promising porous carbon substrate to develop space-confined selenium cathode for rechargeable lithium batteries. Keywords Selenium/porous carbon composite Pomelo peel Lithium-selenium batteries Biomass-derived carbon Cathode