TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The secondary battery has carbon board as positive electrode plate which is made of electroconductive carbon provided on the surface of an aluminum plate as negative electrode plate. The surface of the aluminum plate is subjected to gold plating process, platinum metal plating process, lithium metal plating process, cadmium plating process, nickel plating process, chrome plating process, alumite process, galvalume metal plating process, galvanization process, zinc hot-dip galvanization metal plating process or another coating process. When a voltage of 6 V is applied to the secondary battery for 10 minutes, the secondary battery has electric current value of 0.05 A, voltage of 1.8 V, and charging and discharging are possible. When a voltage of 6 V is applied to the secondary battery of two sets for 10 minutes, the secondary battery of two sets have electric current value of 0.1 A, voltage of 3.6 V, and charging and discharging are possible. pH Concentration of a paste-form acidic substance obtained by dissolving aluminum foil in sulfuric acid in a non-aqueous electrolytic film or non-aqueous electrolyzing substance is 7 which is neutral. The substance which mixed the alkaline substance in the inside of an acidic substance, and form paste-form acidic substance which is neutral substance. The substance is obtained using jelly-form substance which is made of agar, gelatin, or chemical resin. The substance is infiltrated into the inside of a nonwoven fabric which is provided between positive electrode plate and negative electrode plate.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The coating material is graphite or electroconductive graphite, and is coated on the surface of aluminum plate, copper plate, iron plate, or stainless steel board, and heated at 140 degrees C. The aluminum plate is obtained by coating electroconductive graphite or graphite on the surface of the aluminum plate and curing.