The Preparation And Electrochemistry Properties Of SnO₂ And Its Composites

Sn O2-based nanostructure is a kind of typical structure among numerous transition metal oxides used as anode material for lithium-ion batteries. However, its practical application is greatly limited by undesirable large volume during the long-term charge-discharge process,which can generate a large internal stress, leading to pulverization of the electrode and electrical detachment of the active particles. Currently, design new Sn O2-based nanostructured anode materials can alleviate the pulverization problem and sustain the electrode stability of Sn O2 as a potential anode material.The cocoon-like Sn O2 hollow nanoparticles were synthesized by a hydrothermal method and Fe2O3 nanoparticles were employed as template. The obtained monodispersed cocoon-like Sn O2 hollow nanoparticles are highly uniform with controllable size. The X-ray diffraction(XRD) pattern, scanning electron microscopy(SEM) and transmission electron microscopy(TEM) were used to determine the structure and composition of the cocoon-like Sn O2 hollow nanoparticles. Furthermore, the electrochemical properties were characterized,and the results prove that the cocoon-like Sn O2 nanoparticles have good electrochemical performance.for lithium-ion batteries. Moreover, we investigated the mechanism of the formation of cocoon-like Sn O2 hollow nanoparticles.One step high temperature hydrolysis method was developed to obtain new spindle-like Sn O2/Fe2O3 nanoparticles using Fe Cl3 and Sn Cl4 as raw materials. Then, we investigated the affection of the nanostructure for the electrochemical properties. The results suggest that the Fe-Sn nanocomplex shows high capacity and stability, which is better than single Fe2O3 or Sn O2 nanoparticles. Meanwhile, we also prove that the nanocomplex can efficiently enhance the electrochemical for lithium-ion batteries.