TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: A compressive force and a shearing force are applied to the raw-material mixture for binding the electrode active material and electroconductive material. Preferred Components: The mold contains tungsten. The electrode active material is anode active material chosen from lithium-containing compound of olivine-type structure, lithium-containing compound of rock-salt structure having crystal structure of layered rock-salt type or cubic crystal rock-salt type, and lithium-containing compound of spinel-type structure, preferably lithium iron phosphate, lithium iron phosphate containing cobalt, manganese and/or nickel as solid solution, lithium cobalt phosphate, lithium cobalt phosphate containing manganese and/or nickel as solid solution, lithium manganese phosphate, lithium manganese phosphate containing nickel as solid solution, lithium nickel phosphate, lithium nickelate, lithium nickelate containing cobalt and/or aluminum as solid solution, lithium cobaltate, lithium ferrate, lithium ferrate containing titanium and/or manganese as solid solution, lithium titanate, lithium manganate, and/or lithium manganate containing chromium as solid solution. The electrode active material is cathode active material chosen from carbon, silicon, germanium, tin, lead, antimony, aluminum, indium, lithium, stannic oxide, tin oxide, indium-tin alloy, lithium-aluminum alloy, lithium-indium alloy containing indium as solid solution, lithium titanate, and lithium nitride. Preferred Condition: The pressure during sintering is 150 MPa or more.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Apparatus: The mechano-fusing process is carried out using a mechano-fusion apparatus provided with a rotating casing and an inner component fixed in the casing. The clearance distance of the casing and inner component is 0.1-10 mm. When the raw-material mixture is supplied to the casing, the raw-material mixture is bonded by applying the shearing force and compressive force in the clearance between the inner component and inner-wall face while it is pressed on the inner-wall face of the casing by centrifugal force. After supply of raw-material mixture, the casing is rotated for 1-30 minutes at 1000-8000 rpm.