Hydrothermal Synthesis of beta-MnO2/Carbon Nanotubes Nanocomposites as Electrode Materials for Lithium Ion Battery Application

摘要

MnO2/carbon nanotubes (CNTs) nanocomposites were prepared by hydrothermal method with Mn2+ and S2O82- as reactants in the presence of CNTs. The additions of different ratios (10 and 20 wt%) of CNTs are discussed. The crystalline structure and morphology of the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The XRD results reveal that MnO2 is the form of beta-MnO2. The TEM and SEM results show that MnO2/CNTs nanocornposites are composed of MnO2 nanorods with the diameters 60-80 nm and CNTs with the diameters 40-50 nm twisted structure. As cathode materials for lithium ion batteries (LIBs), the MnO2/CNTs nanocomposites electrodes exhibited higher reversible capacities and better cycling stability compared to pure beta-MnO2 at a current density of 100 mA g(-1).