Carbon coated aluminum foil as cathode of solid aluminum electrolytic capacitor and manufacturing method thereof

A manufacturing method of a carbon coated aluminum foil as a cathode of solid aluminum electrolytic capacitors comprising the steps of:

• A. preparing an aluminum foil:
• setting an aluminum foil into a chamber;
• B. roughening at least one surface of the aluminum foil:
• introducing gas into the chamber and activating an electric field so that the gas is ionized and turned into a plasma;
• positive ions in the plasma moving at high speed into the aluminum foil that is set as a cathode of capacitors so that the surface on at least one side of the aluminum foil becomes a rough surface;
• C. depositing carbon atoms:
• introducing gas mixed with carbon atoms and turning on the electric field again so as to make the carbon atoms have positive charge and the carbon atoms with positive charge move at high speed toward the aluminum foil to be mounted into and attached firmly to the rough surface of the aluminum foil, further accumulated sequentially to the rough surface of the aluminum foil to form a carbon film thereon.