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Electrolysis solution and electrolytic capacitor using the same

A technology of electrolyte and electrolyte, which is applied in the direction of electrolytic capacitors, capacitors, circuits, etc., and can solve problems such as open circuits of capacitors

Inactive Publication Date: 2008-10-22
SANYO CHEM IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in electrolytic capacitors using conventional electrolyte solutions, the heat of a solder reflow furnace (for example, 260°C) causes decarboxylation of carboxylic acid anions, so there is a problem of open circuits in the capacitors.

Method used

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  • Electrolysis solution and electrolytic capacitor using the same
  • Electrolysis solution and electrolytic capacitor using the same
  • Electrolysis solution and electrolytic capacitor using the same

Examples

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Effect test

manufacture example 1

[0078] [Manufacture of 1,2,3,4-tetramethylimidazolinium 4-methylphthalate (A-1)]

[0079] In a 1 L stirred autoclave made of SUS, 270.0 g of dimethyl carbonate and 98-0 g of 1,2,4-trimethylimidazoline were filled and reacted at a reaction temperature of 130° C. for 24 hours. After the reaction, the autoclave was cooled, and the reaction solution was analyzed by liquid chromatography. The conversion rate of 1,2,4-trimethylimidazoline was 95.0%. Unreacted materials and by-product methanol produced during the reaction were distilled off to obtain 180 g of 1,2,3,4-tetramethylimidazolinium methyl carbonate (a-1). Next, 30.0 g of the obtained 1,2,3,4-tetramethylimidazolinium methyl carbonate was dissolved in 200.0 g of methanol, and 78.6 g of 4-methylphthalic acid was slowly added, and the reaction was violent, resulting in carbon dioxide gas. Deaeration was performed at 80° C. / 20 mmHg to remove methanol to obtain 48.0 g of 1,2,3,4-tetramethylimidazolinium·4-methylphthalate (A-1)....

manufacture example 2

[0081] [Manufacture of 1,2,3,4-tetramethylimidazolinium 4-ethylphthalate (A-2)]

[0082] Except that 84.7 g of 4-ethylphthalic acid was used instead of 78.6 g of 4-methylphthalic acid, the same procedure as in Production Example 1 was carried out to obtain 1,2,3,4-tetramethylimidazolinium 4- 50.2 g of ethyl phthalate (A-2).

manufacture example 3

[0084] [Manufacture of 1,2,3,4-tetramethylimidazolinium 4-methoxyphthalate (A-3)]

[0085] Except that 85.6 g of 4-methoxyphthalic acid was used instead of 78.6 g of 4-methylphthalic acid, 1,2,3,4-tetramethylimidazolinium 4 was obtained in the same manner as in Production Example 1. - 50.5 g of methoxyphthalate (A-3).

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Abstract

This invention provides an electrolyte anion having a high decomposition temperature that can suppress decarboxylation of an electrolyte anion in an electrolysis solution for an electrolytic capacitor in a lead-free solder reflow process and can prevent valve opening of the capacitor. The electrolysis solution comprises, as an electrolyte, a salt (A) comprising an onium cation (a) and a polycarboxylic acid (b) anion and is characterized in that the charge of the proton part in the carboxyl group in the polycarboxylic acid (b) calculated by the AM1 method in a quantum mechanical calculation software CAChe is not more than 0.243. A polycarboxylic acid (b) represented by general formula (1) is particularly preferred. In the Chemical formula (1), R<1> to R<4>, which may be the same or different, represent hydrogen, a functional group or an optionally functional group-containing hydrocarbon group having 1 to 3 carbon atoms, provided that at least one of R<1> to R<4> represents an electron donating group.

Description

technical field [0001] The present invention relates to an electrolytic solution for electrolytic capacitors and an electrolytic capacitor using the same. Background technique [0002] Conventionally, as an electrolytic solution for electrolytic capacitors, electrolytes such as ammonium salts of carboxylic acids typified by maleic acid and citraconic acid dissolved in γ-butyrolactone or ethylene glycol are known (e.g. Patent Document 1), an electrolytic solution in which a quaternized carboxylate salt of a compound having an alkyl-substituted amidine group is dissolved in γ-butyrolactone or ethylene glycol (for example, Patent Document 2), and the like. [0003] In recent years, lead-free soldering has been promoted in order to reduce the amount of environmentally hazardous substances used. In order to cope with this lead-free soldering, it is necessary to increase the temperature in the reflow process to 260°C. However, in electrolytic capacitors using conventional electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035
CPCH01G9/035
Inventor 黑田慎介笹田信也本田一光滨田景子
Owner SANYO CHEM IND LTD
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