One-step production of capacitive-dominated carbon anode derived from biomass for sodium-ion batteries

Abstract

A strategy of utilizing biomass in energy applications has been the focus of increasing attention because of low cost, renewability and environmental friendliness. Herein, we report a new design of 3D hierarchical porous carbon nanosheet (HPCN) with controlled porous and interconnected structures via a facile Na2HPO4 template-assisted activation method. Combined with a large specific surface area, open hierarchical porous structures and a large interlayer spacing have afforded excellent electrochemical performance in the application of sodium-ion batteries (SIB). As a result, it exhibits the ultrahigh reversible capacity of 333.8 mAh g−1 at 50 mA g−1, excellent rate performance 69.4 mAh g−1 at 10 A g−1, and superior long-term cycling stability at 10 A g−1 during 1000 cycles with 8% capacity fade. This work provides a novel route for rationally designing heteroatoms doped hierarchical porous carbon materials for high-performance SIBs.