Method for producing multilayer porous anodic oxide coating, porous anodic oxide coating, electrode and battery using the same

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a porous anodic oxidation film which is dense, crystalline and suitably usable as an electrode (particularly, the electrode of an Li secondary battery), and a porous anodic oxidation film.SOLUTION: Provided is a method for producing a porous anodic oxidation film characterized in that a Ti substrate is anodically oxidized under the voltage below 100 V using a nitric acid based electrolytic solution, and also provided is a method for producing a multi-layer porous anodic oxidation film characterized in that a second anode oxidation step with an ammonium nitrate solution is performed after the first anode oxidation step with a sulfuric acid solution or an ammonium sulfate solution.