METHOD FOR PRODUCING ELECTRODE FOR ALUMINUM ELECTROLYTIC CAPACITOR

WIPO Patent Application WO/2018/092445

A1

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.

SHIMIZU YUTA (JP)
KATANO MASAHIKO (JP)
YOSHIDA YUYA (JP)
TAIRA TOSHIFUMI (JP)
SONE SHINYA (JP)

PCT/JP2017/035950

May 24, 2018

October 03, 2017

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NIPPON LIGHT METAL CO (JP)

H01G9/04; C25D11/04; C25D11/12; C25D11/16

JP2014057000A	2014-03-27
JPH02216811A	1990-08-29
JPS576250B2	1982-02-04

NAGATA, IZAYA: "Chapter 1.2.2, Chapter 5.1.4 [Passage]", ALUMINUM ELECTROLYTIC CAPACITOR WITH LIQUID ELECTROLYTE CATHODE, 24 February 1997 (1997-02-24), pages 4 - 5 , 266-272, XP009515024
See also references of EP 3544036A4

KAWAI Toru et al. (JP)

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