Manufacturing method of electrode foil for solid-state aluminum electrolytic capacitors

Abstract

The invention relates to a manufacturing method of an electrode foil for solid-state aluminum electrolytic capacitors, which comprises a corrosion part and a formation part. The corrosion part comprises the following steps: pre-treating an electronic plain foil in a hydrochloric acid solution; carrying out hole-forming power-on corrosion on the foil in a mixed solution of hydrochloric acid and sulfuric acid; carrying out reaming power-on corrosion on the foil, and cleaning and soaking the foil; and washing the foil with running water and carrying out annealing to obtain an etched foil. The formation part comprises the following steps: boiling the etched foil for solid-state aluminum electrolytic capacitors in water; carrying out first-stage electrochemical anodic oxidation and first annealing heat treatment; carrying out second-stage electrochemical anodic oxidation, third-stage electrochemical anodic oxidation and second annealing heat treatment; carrying out fourth-stage electrochemical anodic oxidation and third annealing heat treatment; soaking the etched foil in phosphoric acid, soaking the etched foil in ammonium dihydrogen phosphate, and cleaning and drying the etched foil;and obtaining an electrode foil for solid-state aluminum electrolytic capacitors. The disturbance of tip current can be reduced, the generation of invalid small holes in the corrosion process can be reduced, and the capacity extraction rate of the solid foil can be increased. Moreover, the quality of the oxide film can be improved, the stability can be maintained, and the high-temperature stability of solid-state capacitors can be improved.

Description

Technical field [0001] The invention relates to a method for manufacturing electrode foil, in particular to a method for manufacturing electrode foil for solid aluminum electrolytic capacitors. Background technique [0002] Solid-state aluminum electrolytic capacitors use solid electrolytes, which are not easy to flow in the nano-microporous structure of the electrode foil and cannot completely fill the pores. There is a problem of capacity extraction rate during use. There are special requirements for the micropore morphology of the aluminum electrode foil, and it is required to reduce inefficiency. Holes to increase the capacity extraction rate. At the same time, solid aluminum electrolytic capacitors need to undergo a carbonization high temperature heat treatment step during the manufacturing process, which puts forward higher requirements for the high temperature resistance of the aluminum electrode foil. If the electrode foil for ordinary aluminum electrolytic capacitors is...

AI Technical Summary

Problems solved by technology

If the electrode foil for ordinary aluminum electrolytic capacitors is used directly in solid aluminum electrolytic capacitors, it will have the defects of low capacity lead-out rate and high temperature resistance