Abstract:

An easy carbonization and activation approach was employed to synthesize porous carbon material with coffee grounds as carbon source. X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM) show that the prepared material possesses a disordered structure with a relatively high graphitization degree. The existence of mesopores was confirmed by the nitrogen adsorption/desorption isotherms as well as the pore size distribution curve. At a mass current density of 0.1 A/g, the initial discharge and charge capacities of the prepared material can reach as high as 1 029 and 461 mA·h/g, respectively, much higher than the theoretical capacity of graphite (372 mA·h/g).

Key words: lithium ion battery, anode material, porous carbon, biomass, coffee grounds