Hierarchical porous nitrogen-doped carbon material for high performance sodium ion batteries

Abstract

Hierarchical porous carbon materials (HPCMs) with appropriate nitrogen doping have been successfully fabricated from the gelatin by KOH activation. The HPCMs contain porous structure with suitable nitrogen content (2.85%), which specific surface area reach up to 1006 m2 g−1. When applied as anode materials for sodium ion batteries, the HPCMs deliver superior electrochemical performances, including a favorable reversible capacity of 261 mAh g−1 at the current density of 100 mA g−1, excellent rate performance (104 mAh g−1 at 5 A g−1), and superior cycling capability (220 mAh g−1 at 100 mA g−1 after 100 cycles).