Preparation And Properties Of Antimony-based Anode Materials For Li-ion Batteries

The aim of this dissertation is to explore the synthesis antimony and antimony and its compounds by hydrothermal method, solvothermal method and employing microemulsion system. The as-prepared materials were characterized by XRD, TEM and SEM. Their electrochemical properties as anode materials for Li-ion Battery were also investigated. The major contents can be summarized as follows:1. Iron powder was used as a new kind reductant to synthesize antimony nanocrystals and the prepared products were characterized by XRD and TEM. Antimony products with dendrites, spheres, pine needles, nanorode were obtained by adjusting solvent, surfactant and temperature. That reversible capacitity of the pine needle antimony kept at 402mAh/g in the 20th cycle. Pine needle Sb exhibits a better cycling behavior than the dendrite owing to its ordered nanostructure.2. The hollow antimony micrometer spheres have been successfully prepared via cyclohexane/CTAB/water microemulsion (0/W) system. The products were analyzed using XRD, TEM, field emission scanning electron microscopy (FESEM). Dihydroxytartaric acid, KCl, the concentration of SbCl3, temperature and reductant play important role in the morphology and the yield of the product. During the charge-discharge cycling test, the layered antimony hollow spheres exhibits good cyclecapacity, the reversible capacity was 404 mAh/g in the 20th cycle.3.γ-NiSb nanocrystal and Sb₂S₃ were synthesized via hydrothermal and solvothermal route respectively. The products were analyzed using a XRD, TEM, FESEM. This two kinds of materials were first studied as anode materials for Li-ion battery. The reversible capacity ofγ-NiSb and Sb₂S₃ nanorode were 294 mAhg^-1 and 292mAhg^-in the 20th cycle respectively.