Biomass derived porous carbon anode materials for lithium-ion batteries with high electrochemical performance

Abstract

Porous carbon materials derived from plane tree leaves were prepared via a facile high-temperature carbonization method. The plane tree leaves were activated by KOH solution, and then carbonized under nitrogen atmosphere protection at 500 ℃, 600 ℃, 700 ℃ and 800 ℃ respectively. The obtained porous carbon materials were characterized in detail by scanning electron microscope (SEM), X-ray powder diffractometer (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman Spectroscopy and BET analysis. The electrochemical properties of the materials were analyzed by galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). Due to the unique porous structure and high active surface, the sample carbonized at 700 ℃ displayed the highest reversible specific capacity of 460.4 mAh/g at a current density of 50 mA g-1, and maintained a specific capacity of 242 mAh/g even at a high current density of 2000 mA/g.