Effects of surface modification on the electrochemical performance of pyrolyzed sugar carbons as anode materials for lithium-ion batteries

摘要

The surface of pyrolyzed sugar carbons (PSCs) was treated with H_2O_2, HNO_3, or H_2SO_4 reagents. Surface modification of these materials improved their electrode performance. FTIR, Raman, ~(13)C NMR, and X-ray diffraction (XRD) spectroscopic techniques were used to characterize structures of the treated and untreated carbons. The charge/discharge capacity, potential profile, and irreversible capacity loss have been investigated. The correlations between cell capacities, H/C ratios, and Raman vibrational modes are discussed.