Abstract
Sweet sorghum stalk can be used to prepare carbon materials and used in lead carbon battery negative materials. In this work, the sweet sorghum stalk was pretreated with 5 wt.% H3PO4, after heated at 550℃ for 105 min, lead-coated sweet sorghum stalk-based carbon materials were prepared by the solvent method, and their electrochemical performance were measured by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), as well as BET test, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray powder diffraction spectrum (XRD) methods. The negative electrode materials contained lead-coated sweet sorghum stalk-based carbon material and physical grinding compared material were assembled into simulated lead-carbon batteries, the charge-discharge tester was used to test their first charge-discharge curves and cycle life curves, the first discharge specific capacity of two kinds materials were 73.0 mAh/g and 57.24 mAh/h, with 71.8% and 57.5% of capacity retention ratios after 150 cycles, respectively, shown that the simulated lead-carbon battery with new prepared carbon material exhibits better electrochemical performance.