JP3625234B2 - Electrolytic solution for driving electrolytic capacitors - Google Patents
Electrolytic solution for driving electrolytic capacitors Download PDFInfo
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- JP3625234B2 JP3625234B2 JP01263196A JP1263196A JP3625234B2 JP 3625234 B2 JP3625234 B2 JP 3625234B2 JP 01263196 A JP01263196 A JP 01263196A JP 1263196 A JP1263196 A JP 1263196A JP 3625234 B2 JP3625234 B2 JP 3625234B2
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- JP
- Japan
- Prior art keywords
- electrolytic
- electrolytic solution
- driving
- solution
- capacitors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【０００１】
【産業上の利用分野】
本発明は電解コンデンサの駆動用電解液（以下単に電解液と称する）の改良に関するものであり、優れた電導度を有し高温で安定な電解液に関するものである。
【０００２】
【従来の技術】
一般に電解コンデンサは高純度アルミニウム箔をエッチングして表面積を増大させ、その表面を陽極酸化して誘電体化した陽極箔と、この陽極箔と対向するエッチングされた陰極箔との間に隔離紙を介在させて巻回した構造の素子に電解液を含浸させ、ケ−スに収納し、封口体により封口してなるものである。
このような電解コンデンサにおいては電解液の特性が電解コンデンサの性能を決定する大きな要因となる。
特に近年の電解コンデンサの小型化に伴い、エッチング倍率の高いものが使用されるようになり、コンデンサの抵抗率が大きくなっていることから、これに用いる電解液としては比抵抗の小さいものが常に要求される。
従来の電解液の中でコストも安く、比抵抗の低いものとしてはエチレングリコ−ルを主溶媒としてこれに水を加え、さらに電解質としてアジピン酸、安息香酸等のカルボン酸のアンモニウム塩を溶解したものが使用されている。
【０００３】
【発明が解決しようとする課題】
しかし、このような電解液は比抵抗を低下させることはできるものの水の添加量が多い為、高温下では電解液中の水が電極箔と水和反応してガスを発生させ、電解コンデンサの内圧を上昇させるので１０５℃以上での使用は困難であった。
【０００４】
【課題を解決するための手段】
本発明は、上述の課題を解決するためエチレングリコ−ルと１０〜２０ｗｔ．％の水とを混合した溶媒にアジピン酸、安息香酸のうち少なくとも１種類の有機カルボン酸またはその塩を溶質として溶解させたものにＬ−ロイシンを０．０１〜３．０ｗｔ．％添加したことを特徴とする。
【０００５】
【作用】
Ｌ−ロイシンを添加することによって水の添加量が増加しても１０５℃の高温下において電解液中の水と電極箔との水和反応が抑制され、ガス発生が抑えられる。
【０００６】
Ｌ−ロイシンの添加量を種々検討した結果、０．０１〜３．０ｗｔ．％の範囲内で良好であった。０．０１ｗｔ．％未満では抑制効果は現れず、３．０ｗｔ．％を超えると耐圧が低下してしまう。
【０００７】
水の添加量は１０〜２０ｗｔ．％の範囲であり、１０ｗｔ．％未満では比抵抗が低くならず、２０ｗｔ．％を超えるとＬ−ロイシンによる上記の効果が現れなくなる。
【実施例】
以下、本発明の実施例について説明する。
表１に本発明に係わる電解液（試料記号ａ，ｂ，ｃ，ｄ，ｅ，ｆ，ｇ，ｈ，ｉ，ｊ）と比較のための従来の電解液（試料記号Ａ，Ｂ，Ｃ，Ｄ）のそれぞれの電解液の組成比、及び同電解液の３０℃における比抵抗を示す。
【０００８】
【表１】
また、表２に上記電解液を各々用いてアルミニウム電解コンデンサを各５０ケ作製し、１０５℃中で１０００時間負荷試験を行った結果を示す。コンデンサ試料は何れも定格１０Ｖ４７００μＦのアルミニウム電解コンデンサである。
【００１０】
【表２】
従来の電解液（Ａ，Ｂ，Ｃ，Ｄ）を使用したアルミニウム電解コンデンサはガス発生が多く、短時間で防爆弁が作動してしまった。本発明に係わる電解液（試料記号ａ，ｂ，ｃ，ｄ，ｅ，ｆ，ｇ，ｈ，ｉ，ｊ）を使用したアルミニウム電解コンデンサは１０５℃１０００時間後でも安定した特性を示している。
【００１２】
【発明の効果】
以上のように本発明ではＬ−ロイシンを添加することにより水の添加量が多くなっても高温下での安定性に優れた比抵抗の低い電解液が得られる。よって低コストで電解コンデンサの特性改善並びに信頼性向上をはかることができ、工業的ならびに実用的価値の大なるものである。[0001]
[Industrial application fields]
The present invention relates to an improvement in an electrolytic solution for driving an electrolytic capacitor (hereinafter simply referred to as an electrolytic solution), and relates to an electrolytic solution having excellent conductivity and stable at a high temperature.
[0002]
[Prior art]
In general, an electrolytic capacitor etches high-purity aluminum foil to increase the surface area, and a separator paper is placed between the anode foil whose surface is anodized and made into a dielectric, and the etched cathode foil facing the anode foil. An element wound with an intervening structure is impregnated with an electrolytic solution, housed in a case, and sealed with a sealing body.
In such an electrolytic capacitor, the characteristics of the electrolytic solution are a major factor that determines the performance of the electrolytic capacitor.
In particular, along with the recent miniaturization of electrolytic capacitors, the one with high etching magnification has been used, and the resistivity of the capacitor has increased. Therefore, as the electrolytic solution used for this, one having a low specific resistance is always used. Required.
Among the conventional electrolytes, the cost is low and the specific resistance is low, ethylene glycol is the main solvent, water is added to it, and the ammonium salt of carboxylic acid such as adipic acid or benzoic acid is dissolved as the electrolyte. Things are used.
[0003]
[Problems to be solved by the invention]
However, although such an electrolytic solution can reduce the specific resistance, the amount of water added is large. Therefore, at high temperatures, the water in the electrolytic solution hydrates with the electrode foil to generate gas, and the electrolytic capacitor Since the internal pressure was raised, it was difficult to use at 105 ° C. or higher.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has ethylene glycol and 10 to 20 wt. % L-leucine in a solution in which at least one organic carboxylic acid or a salt thereof among adipic acid and benzoic acid is dissolved as a solute in a solvent mixed with 1% water. % Addition.
[0005]
[Action]
Even if the amount of water added is increased by adding L-leucine, the hydration reaction between the water in the electrolyte and the electrode foil is suppressed at a high temperature of 105 ° C., and gas generation is suppressed.
[0006]
As a result of various investigations on the amount of L-leucine added, 0.01 to 3.0 wt. % Within the range. 0.01 wt. If it is less than 5%, no inhibitory effect appears, and 3.0 wt. If it exceeds 50%, the pressure resistance will decrease.
[0007]
The amount of water added is 10 to 20 wt. %, 10 wt. If it is less than%, the specific resistance is not lowered, and 20 wt. When it exceeds%, the above-mentioned effect due to L-leucine does not appear.
【Example】
Examples of the present invention will be described below.
Table 1 shows an electrolytic solution according to the present invention (sample symbols a, b, c, d, e, f, g, h, i, j) and a conventional electrolytic solution for comparison (sample symbols A, B, C, The composition ratio of each electrolyte solution of D) and the specific resistance at 30 ° C. of the electrolyte solution are shown.
[0008]
[Table 1]
Table 2 shows the results of 50 aluminum electrolytic capacitors each produced using the above electrolytes and subjected to a load test at 105 ° C. for 1000 hours. All the capacitor samples are aluminum electrolytic capacitors rated at 10V4700 μF.
[0010]
[Table 2]
Aluminum electrolytic capacitors using conventional electrolytes (A, B, C, D) generate a lot of gas, and the explosion-proof valve was activated in a short time. An aluminum electrolytic capacitor using the electrolytic solution according to the present invention (sample symbols a, b, c, d, e, f, g, h, i, j) shows stable characteristics even after 1000 hours at 105 ° C.
[0012]
【The invention's effect】
As described above, in the present invention, by adding L-leucine, an electrolytic solution having a low specific resistance and excellent stability at high temperatures can be obtained even when the amount of water added increases. Therefore, the characteristics and reliability of the electrolytic capacitor can be improved at low cost, and the industrial and practical value is great.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01263196A JP3625234B2 (en) | 1996-01-29 | 1996-01-29 | Electrolytic solution for driving electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01263196A JP3625234B2 (en) | 1996-01-29 | 1996-01-29 | Electrolytic solution for driving electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09213577A JPH09213577A (en) | 1997-08-15 |
| JP3625234B2 true JP3625234B2 (en) | 2005-03-02 |
Family
ID=11810733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01263196A Expired - Fee Related JP3625234B2 (en) | 1996-01-29 | 1996-01-29 | Electrolytic solution for driving electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3625234B2 (en) |
-
1996
- 1996-01-29 JP JP01263196A patent/JP3625234B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09213577A (en) | 1997-08-15 |
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