Method for Multiphasic Tin-based Nano Structures/Amorphous Carbon Nano Composite and Anode Active Materials Comprising the Same

摘要

The present invention relates to a tubular nanocomposite comprising: multiphase tin oxides having a zero-dimensional shape through a thermochemical reduction of a bacteria/tin oxide powder, obtained by directly binding tin oxide onto the surface of bacteria of the Bacillus genus, in an hydrogen atmosphere; and a complex of amorphous carbon derived from tin metals and bacteria. It is possible to resolve a low capacity and a low output (a low capacity at a high current density), and a large decrease in capacity with cycling due to a large change in volume during a reaction with lithium, which have been indicated as the shortcomings of a conventional cathode active material for a lithium secondary battery, by preparing a tubular nanocomposite comprising amorphous carbon/tin element-based multiphase low-dimensional nanostructures to be prepared by utilizing bacterial as a template, binding tin oxide capable of implementing a high capacity onto the surface of the bacteria, and thermochemically reducing the same. The thermochemical reduction of the present invention has a simple and economical preparation process, enables preparation of various shapes of a composite according to the shape of a bacteria template to be used, and facilitates low temperature synthesis, intermediate synthesis, and mass production. Thus, the present invention is expected to have practical applicability to the lithium secondary battery field and the electrical double-layer capacitor field.