New Synthetic Route And Electrochemical Property Of Nano-carbon Composite As Negative Material For Lithium Batteries

Lithium-ion batteries are most promising high power secondary batteries. The development of negative material plays an important role in the further development of Lithium-ion batteries. In recent years, many efforts have been devoted to C-based composite materials, and great progresses have been made.Nanosized SnO2/C composite and MnO2/C composite have been prepared using CNF as supports. The composite materials were characterized by X-ray diffraction (XRD) and transmission eletron microscopy (TEM). The Carbon in composite materials was amorphous. TEM results revealed that the SnO2 particles with the average crystallite size of about 10nm and MnO2 particles with the average crystallite size of 20-30nm were homogenously dispersed in the carbon matrix. The electrochemical properties of the nanosized SnO2/C and MnO2/C composites as negative materials for lithium ion batteries were also studied. Cyclic voltammetry and AC impedance (EIS) measurements show that the high discharge capacity and excellent cycling performance were obtained.In this paper, we used cheaper and no-pollution cane sugars as the precursors, and prepared the metal oxides/C composite electrode materials, which were characterized by physical and electrochemical tests. High discharge capacity and excellent cycling performance were achieved.