NOVELTY - The method involves mixing 5-20 wt.% conductive agent in a dispersion medium by adding a conductive agent spreader in an electrode active material spreader. The conductive agent spreader is mixed to another dispersion medium to manufacture the electrode active material spreader. 60-90 wt.% electrode active material is dispersed into the electrode active material spreader. A binder is provided in the conductive agent spreader. The electrode active material is cathode active material or anodal active material.    USE - Method for manufacturing electrode active material slurry of large-sized battery in a power storage device e.g. cellular phone, camcorder and notebook computer, and a vehicle e.g. HEV, PHEV and EV.    ADVANTAGE - The method enables maintaining stabilized state of a compound material with the conductive agent spreader and the electrode active material spreader, so as to manufacture sound zeta potential, so that electrode active material slurry is manufactured. The method enables mixing the electrode active material and the conductive agent within the electrode active material in a uniform manner. The method enables dispersing the conductive agent so as to produce cycleability of a cell in an effective manner.    DETAILED DESCRIPTION - The binder is selected from polyvinyl fluorife-hexafluoropropylene, polyvinylidene fluoride, polyacrylonitrile, polymethyl methacrylate, styrene butadiene rubber or carboxyl methyl cellulose. The agent conductive is selected from carbon black, graphite, carbon fiber, carbon nanotube, acetyleneblack or ketjen black. The cathode active material is made of oxide containing lithium. The oxide containing lithium is lithium-containing transition metal oxide. The anodal active material is made of lithium metal, carbonaceous material and metal compound. The metal compound is selected from silicon, germanium, tin, lead, phosphorus, antimony, bismuth, aluminum, gallium, indium, titanium, manganese, iron, cobalt, nickel, copper, zinc, silver, magnesium, strontium and barium. An INDEPENDENT CLAIM is also included for an electrode active material slurry.    DESCRIPTION OF DRAWING(S) - The drawing shows a graphical view illustrating relationship between shear viscosity and shear rate of an electrode active material slurry.'(Drawing includes non-English language text)'