NOVELTY - The method involves carrying out proportionality filling of electrode active material (100), electrically conductive material (101) and binder in a hopper (106), in constant supply zone (102). The filled materials are prepared and mixed using stirring blade of ribbon or spiral shape. The filling and mixing process are continuously performed, to form a mixed metal powder (111) that is stored in storage zone (105).    USE - Method for manufacturing mixed metal powder for lithium ion battery (claimed) used for battery-powered motor vehicle, and fuel cell electric vehicle, and toner (claimed) for use in copier. Can also be used in manufacture of other chemical goods and foodstuffs.    ADVANTAGE - The mixed metal powder of highly accurate proportion can be effectively and inexpensively manufactured. The quality and manufacturing precision of the metal powder can be improved. The scattering of the granular material can be eliminated, and the environmental condition can be improved. The time, cost and effort can be reduced. The safety can be improved. The mass production can be achieved.    DETAILED DESCRIPTION - The apparatus has piston slider reciprocally fitted in slider hole of piston that reciprocates in piston hole of cylinder. A receiving chamber has suction hole, cylinder discharge hole, and casing exhaust hole that are formed of sintered alloy of sequentially varying diameters, and connected with a vacuum pump (110). The vacuum pump performs evacuation process with negative pressure, for vacuum suction of granular material through a filter (108) into hopper. A grading machine performs particle size grading of the granular material that are sequentially passed through the holes of different diameters respectively.    DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory diagram illustrating the process for preparing, mixing, forming and filling powder.    Electrode active material (100)    Electrically conductive material (101)    Supply zone (102)    Storage zone (105)    Hopper (106)    Filter (108)    Vacuum pump (110)    Mixed metal powder (111)