NOVELTY - Preparation of nanocomposite involves manufacturing bacteria dispersion solution by cultivating bacteria and controlling concentration of the bacteria using deionized water, adding precursor solution, stirring, adding solution obtained by dissolving hydrazine hydrate in deionized water, to resultant solution, refluxing, such that transition metal oxide is uniformly adhered on surface of the bacteria, centrifuging obtained solution, washing obtained precipitate, vacuum-drying and performing thermochemical reduction process on obtained bacteria/transition metal oxide composite powder.    USE - Preparation of nanocomposite used for anode active material for lithium secondary battery (all claimed), electrical double-layer capacitor, fuel cell and solar cell.    ADVANTAGE - The nanocomposite is economically prepared under reduced temperature by simple method in short time, with high productivity. The battery containing the nanocomposite has favorable capacity and output.    DETAILED DESCRIPTION - Preparation of nanocomposite comprising tin-based multiphase nanostructure and amorphous carbon involves manufacturing bacteria dispersion solution by cultivating bacteria and controlling concentration of the bacteria using deionized water, adding precursor solution obtained by dissolving transition metal precursor in deionized water to manufactured bacteria dispersion solution, stirring at 20-30 degrees C for 0.5-2 hours, such that Bacillus bacteria is uniformly dispersed, adding solution obtained by dissolving hydrazine hydrate in deionized water to resultant solution, refluxing, such that transition metal oxide is uniformly adhered on surface of the bacteria, centrifuging obtained refluxed solution, washing obtained precipitate, vacuum-drying and performing thermochemical reduction process on obtained bacteria/transition metal oxide composite powder. An INDEPENDENT CLAIM is included for nanocomposite.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of the preparation of nanocomposite. (Drawing includes non-English language text)