JP2656076B2 - Electrolytic solution for driving electrolytic capacitor and electrolytic capacitor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrolytic solution for driving an electrolytic capacitor and an electrolytic capacitor.

2. Description of the Related Art Conventionally, as an electrolytic solution for driving an electrolytic capacitor, a solute containing a quaternary ammonium salt of an alicyclic carboxylic acid such as 1,2-cyclohexanedicarboxylic acid or 1,1-cyclopentanedicarboxylic acid has been used. JP-A-62-145716) is known.

However, these have insufficient specific conductivity.

Means for Solving the Problems The present inventors have intensively studied for the purpose of an electrolytic solution having a high specific conductivity, and as a result, have reached the present invention.

That is, the present invention provides bicyclo [2.2.1] hepta-2
-An electrolytic capacitor drive characterized in that an acid of ene-2,3-dicarboxylic acid and / or bicyclo [2.2.1] hepta-2,5-diene-2,3-dicarboxylic acid and / or a salt thereof is used as a solute. Electrolyte.

Action In the present invention, bicyclo [2.2.1] hepta-2-ene-2,3-dicarboxylic acid and / or bicyclo [2.2.
1] Examples of salts of hepta-2,5-diene-2,3-dicarboxylic acid include ammonium salts, primary amines ｛C1-18 alkylamines (eg, methylamine, ethylamine, propylamine, butylamine, etc.), aromatic amines ( Salts such as aniline and naphthylamine), cyclohexylamine and the like, secondary amines dialkylamines (such as dimethylamine, diethylamine, dipropylamine, dibutylamine, methylethylamine, methylstearylamine and the like), arylalkylamines (such as N- Salts such as methylaniline), morpholine, etc., tertiary amines, trialkylamines (eg,
Tributylamine, etc.), salts of aryldialkylamines (such as dimethylaniline), quaternary ammonium tetraalkyl (the alkyl group usually has 1 to 12 carbon atoms)
Ammonium (tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, methyltriethylammonium,
Ethyltrimethylammonium, etc.), aryltrialkylammonium (such as phenyltrimethylammonium), cyclohexyltrialkylammonium (such as cyclohexyltrimethylammonium), arylalkyltrialkylammonium (such as benzyltrimethylammonium) and N, N-dialkylpiperidinium (N, (N-dimethylpiperidium and the like) and mixtures thereof.

Of these, tertiary amines and quaternary ammonium salts are preferred, and quaternary ammonium salts are more preferred.

The molar ratio of bicyclo [2.2.1] hept-2-ene-2,3-dicarboxylic acid and / or bicyclo [2.2.1] hept-2,5-diene-2,3-dicarboxylic acid to quaternary ammonium Is usually 0.5 to 1.5, preferably 0.8 to 1.2.

In the above, the molar ratio is bicyclo [2.2.1] hepta-
Related to the specific conductivity of the electrolyte containing a salt of 2,5-diene-2,3-dicarboxylic acid and quaternary ammonium, 0.5 to 1.5
Outside the range, the specific conductivity decreases. The specific conductivity increases at a molar ratio of 0.8 to 1.2 and reaches a maximum at 1.0.

Specific examples of the salt in the present invention include a salt with tetraethylammonium hydroxide.

Such salts are, for example, bicyclo [2.2.1] hepta-
2-ene-2,3-dicarboxylic acid or bicyclo [2.2.
1] It is easily synthesized by the reaction of hepta-2,5-diene-2,3-dicarboxylic acid with tetraethylammonium hydroxide.

The electrolytic solution of the present invention comprises an acid and / or salt and a solvent (usually an organic solvent). Examples of the organic solvent include alcohols; monohydric alcohols (such as butyl alcohol, diacetone alcohol, benzyl alcohol, and amino alcohol); dihydric alcohols (such as ethylene glycol, propylene glycol, diethylene glycol, and hexylene glycol); and trihydric alcohols (Glycerin, 8-methylpentane-1,3,5-triol, etc.); hexitol, etc., ethers, monoethers (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol) Phenyl ether, etc.); diethers (ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol di Chirueteru, diethylene glycol diethyl ether)
Amides, formamides (N-methylformamide, N, N-dimethylformamide, N-ethylformamide, N, N-diethylformamide, etc.); acetamides (N-methylacetamide, N, N-dimethylacetamide, N-ethylacetamide, N, N-diethylacetamide, etc.); propionamides (N, N-dimethylpropionamide, etc.); hexamethylphosphorylamide, etc., oxazolidinones (N-methyl-2-oxazolidinone, N-ethyl-) 2-oxazolidinone, 3,5-dimethyl-2-oxazolidinone, etc.), lactones (γ-
Butyrolactone, α-acetyl-γ-butyrolactone,
β-butyrolactone, γ-valerolactone, δ-valerolactone, etc.), nitriles (acetonitrile, acrylonitrile, etc.), dimethylsulfoxide, sulfolane, 1,3-dimethyl-2-imidazolidinone, 2-pyrrolidone and two or more of these. And mixtures thereof. Of these, amides and γ-butyrolactone are preferred.

Water may be contained in the electrolyte of the present invention, if necessary. Its content is usually 10% or less based on the weight of the electrolyte.

In the electrolytic solution of the present invention, the acid of bicyclo [2.2.1] hept-2-ene-2,3-dicarboxylic acid and / or the acid of bicyclo [2.2.1] hept-2,5-diene-2,3-dicarboxylic acid The content of and / or a salt thereof is usually 1 to 50%, preferably 5 to 30% based on the weight of the electrolytic solution. If it is less than 1%, the specific conductivity of the electrolytic solution will not increase, and if it is more than 50%, the solubility will be poor.

The electrolytic solution of the present invention is essentially bicyclo (2.2.1)
Hept-2-ene-2,3-dicarboxylic acid and / or bicyclo [2.2.1] Hepta-2,5-diene-2,3-dicarboxylic acid and / or a salt thereof, and a solvent,
Various additives can be added for the purpose of reducing leakage current and absorbing hydrogen gas. Examples of the additive include a phosphoric acid derivative and a nitro compound.

EXAMPLES Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited thereto.

Table 1 shows the electrolyte compositions of Examples 1 and 2 of the present invention and Comparative Examples 1 and 2, and their specific conductivities at 30 ° C.

Effect of the Invention Since the electrolytic solution of the present invention has a higher specific conductivity than that of the related art, the loss of the electrolytic capacitor can be reduced by using the electrolytic solution of the present invention.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yukari Washio 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Keiji Mori 1006 Kazama Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inside the company (72) Noriyuki Shio 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Yoshiki Kuwae 5-6 Nakiyama Nishiyama, Yawata City, Kyoto (72) Inventor Kazushi Shiono Kyoto 7-3 Tsuji-cho, Goyo, Sengakuji, Higashiyama-ku, Kyoto-shi (72) Inventor Takaaki Kino 22-13, Kitano-sho, Gogasho, Uji-shi, Kyoto (56) References JP-A-61-116815 (JP, A)

Claims (2)

(57) [Claims] (1) Bicyclo [2.2.1] hept-2-ene-2,3
-An electrolytic solution for driving an electrolytic capacitor, characterized by using an acid of dicarboxylic acid and / or bicyclo [2.2.1] hepta-2,5-diene-2,3-dicarboxylic acid and / or a salt thereof as a solute. 2. An electrolytic capacitor comprising a capacitor element impregnated with the electrolytic solution for driving an electrolytic capacitor according to claim 1.