Method for producing electrode for aluminum electrolytic capacitor
US11094472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2017 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Oct 3, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/151
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a method for producing an electrode for an electrolytic capacitor, the method comprising: a hydration step in which an aluminum electrode is immersed in a hydration treatment solution having a temperature of 80° C. or higher; and a chemical conversion step in which the aluminum electrode is subjected to chemical conversion treatment up to a formation voltage of at least 400 V. The hydration treatment solution contains a hydration inhibitor. The thickness of a hydrated film formed in the hydration step satisfies the following condition, 0.6≤t2/t1≤1, wherein t1 is the average thickness of the hydrated film formed in a depth range of up to 100 μm from the surface of the aluminum electrode, and t2 is the average thickness s of the hydrated film formed in a deep portion at least 100 μm from the surface of the aluminum electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.