Surface Modification of Carbon Aerogels for LiFePO4 Composites
Carbon aerogels were modified by ammonia solution assisted by microwave radiation in order to obtain materials with good dispersion stability in water and satisfactory electrical conductivity simultaneously. Several techniques were used to characterize the materials including FTIR, Raman spectroscopy, Zeta potential, Four-Point Probe and nitrogen adsorption. The results revealed that the dispersion stability of carbon aerogels in water got better and electrical conductivity of carbon aerogels increased at first and then decreased with the increase of microwave heating time, which were closely associated with oxygen surface groups and degree of graphitization and pore structure. As a good template, the modified carbon aerogels with good dispersion stability and electrical conductivity were used to synthesize LiFePO4 composites, and the improved electrochemical properties of these composites were characterized by means of Four-Point Probe and galvanostatic charging/discharging.
X. S. Ma et al., "Surface Modification of Carbon Aerogels for LiFePO4 Composites", Advanced Materials Research, Vols. 311-313, pp. 9-14, 2011