Electrode Foil Dielectric Structure for Higher Capacitor Capacitance

The patent removes the natural oxide film that forms on the anode body surface through chemical etching or electrochemical treatment. By extracting this harmful oxide layer, the patent eliminates the source of impurities and uneven coverage that reduce electrostatic capacity, while the subsequent dielectric layer formation provides the necessary protection without the harmful effects of the natural oxide film.

The patent creates a controlled dielectric layer with specific local properties on the anode body surface. Instead of relying on the uniform but impure natural oxide film, the patent forms a dielectric layer with controlled thickness and composition that provides both protection and high electrostatic capacity. The etching process also creates a porous structure with different local properties that enhance capacitance.

The patent applies the local quality principle by creating a porous structure in the dielectric layer with varying local thickness. The etching process generates pores that allow the dielectric material to be present in multiple locations at different distances from the electrode, providing both coverage and maintaining strong electric field interaction for high capacitance.

The patent implements a nested structure where the porous dielectric layer contains pores that are filled with electrolyte or additional dielectric material. This nested configuration allows the protection function to be maintained while the inner regions provide enhanced electrostatic capacity through the nested dielectric/electrolyte structure.