Synthesis And Performance Research Of Novel Li-ion Battery Materials

Nanomaterials are the materials which at least one of their three dimensions is in the nanoscle (1-100nm). When size of the materials is in the nanoscale, these materials often show some special properties in electricity, optics, magnetics, mechanics, and even, biology, and so on, which different from the properties of atoms, molecules and solid materials. Different from conditional materials, the quantum size effect, small-size effect, surface effect, macroscopic quantum tunneling effect, and dielectric confinement effect of nanomaterials are the basic properties of nanoparticles and nanosolids. Besides, these properties make nanomaterials exhibit many particular physical and chemical properties. Therefore, in recent years, nanomaterials drew more and more people's attention to study with them.This paper mainly studies in the applying of nanomaterials in Li-ion batteries as electrode materials; there is also a relational work in photoluminescence. Nanomaterials were synthesized via hydrothermal/solvothermal method. SEM, TEM, HRTEM, XRD, XPS etc. were used to characterize the morphology and structure of the products. We also carried out some experiments to test the electrochemical and optical properties of obtained nanomaterials.Flower-like NiO microspheres were synthesized via a one-step solvothermal route under controlled conditions, their diameters were～50nm. During this procedure the surfactants were used as templates to supply growth sites and to restrict the growth directions. NiO microspheres were finally obtained with further calcination. The unique nanostructure makes NiO microspheres present superior Li storage performances at initial charge/discharge cycles and further improvement in cyclic stability is still needed.Two different morphology SnS2 nanostructure materials were synthesized through hydrothermal/solvothermal process. SEM, TEM, XRD etc. were used to characterize the morphology and structure of the two products, respectively. And the electrochemical properties of two products were tested. The two types of SnS2 obtained through this process exhibit good purity, good crystallinity, special morphology, and uniform size. The electrochemical properties of two products were relatively good, and there is space for further improvement.Mesoporous Eu2O3 spheres and Eu2O3 nanoparticle-wires were obtained and characterized by HRTEM and X-ray diffraction. By means of adjusting synthetic parameters, for example, different synthetic temperature, adding soft templates SDS, etc, two kinds of precursors such as sphere-like and wire-like Eu2O(CO3)2H2O were obtained respectively. Through calcined precursors at 650℃, the high-quality mesoporous Eu2O3 spheres and Eu2O3 nanoparticle-wires show the strong optical property. Both fluorescence spectrum and XRD pattern prove that synthetic mesoporous Eu2O3 spheres and Eu2O3 nanoparticle-wires own cubic phase structures.