NOVELTY - An anode raw material containing anode substance, substance other than fine powder of anode substance, polar solvent and supercritical fluid are added to a pressure-resistant container (2) and heat-pressed. The pressure in the container falls, supercritical fluid is gasified and anode substance is separated. Then, the separated anode substance is mixed with conductive polymer and supercritical fluid and then heat-pressed in a pressure-resistant container. The pressure in the container falls and supercritical fluid is gasified, to obtain modified fine-powdery anode material.    USE - Manufacture of modified fine-powdery anode material used for lithium ion battery for portable electronic devices and hybrid vehicles.    ADVANTAGE - The method efficiently provides high-purity modified fine-powdery anode material using simple process. The battery using the modified fine-powdery anode material has excellent electroconductivity.    DETAILED DESCRIPTION - An anode raw material containing anode substance, substance other than fine powder of anode substance, polar solvent and supercritical fluid in supercritical state or subcritical state are added to a pressure-resistant container and heat-pressed such that the supercritical fluid may be in supercritical state or subcritical state. The pressure in the container falls, supercritical fluid is gasified and anode substance is separated. Then, the separated anode substance is mixed with conductive polymer and supercritical fluid and then heat-pressed in a pressure-resistant container such that the supercritical fluid may be in supercritical state or subcritical state. The pressure in the container falls and supercritical fluid is gasified, to obtain modified fine-powdery anode material.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic structure of modified fine-powdery anode material manufacturing apparatus.    Modified fine-powdery anode material manufacturing apparatus (1)    Pressure-resistant container (2)    Stirrer (2A)    Carbon dioxide cylinder (3)    Pump (3A)