采用锡盐溶液浸渍-煅烧锯末法,制备了SnO2纳米空心球.分别用X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)及恒流充放电技术对产品的结构形态和电化学性质进行了表征.结果表明,SnO2空心球的尺寸在50～120nm之间,壳层厚度约为5nm.在作为锂离子电池正极使用时,初始放电容量为607.7 mAh g-1.
SnO2 hollow nanospheres were prepared by the simple heat treatment of sawdust impregnated by SnCl4 water solution in alkaline conditions. The crystallographic structure of the sample was determined by X-ray powder diffraction (XRD). The structure and morphology of these hollow SnO2 nanostructures were investigated by transmission electron microscopy (TEM) and high-resolution transmission electron micros-copy (HRTEM). The formation mechanism of SnO2 hollow sphere was studied by TEM preliminarily; it in-dicates that microspheres containing Sn-ion were formed in the impregnating process. The electrochemical Li-insertion of hollow SnO2 anodes were measured by the galvanostatic charge-discharge technique. Pre-liminary testing indicates that the initial charge capacity of 607.7 mAh g-1 is higher than that of carbon-based materials (theoretically 372.0 mAh g-1).
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