JP4570790B2 - Electrolytic solution for driving electrolytic capacitors - Google Patents
Electrolytic solution for driving electrolytic capacitors Download PDFInfo
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- JP4570790B2 JP4570790B2 JP2001008859A JP2001008859A JP4570790B2 JP 4570790 B2 JP4570790 B2 JP 4570790B2 JP 2001008859 A JP2001008859 A JP 2001008859A JP 2001008859 A JP2001008859 A JP 2001008859A JP 4570790 B2 JP4570790 B2 JP 4570790B2
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- Prior art keywords
- electrolytic solution
- electrolytic
- hydroxyquinaldine
- water
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- 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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- 239000008151 electrolyte solution Substances 0.000 title claims description 23
- 239000003990 capacitor Substances 0.000 title claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- NBYLBWHHTUWMER-UHFFFAOYSA-N 2-Methylquinolin-8-ol Chemical compound C1=CC=C(O)C2=NC(C)=CC=C21 NBYLBWHHTUWMER-UHFFFAOYSA-N 0.000 claims description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 8
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 8
- 239000005711 Benzoic acid Substances 0.000 claims description 4
- 235000011037 adipic acid Nutrition 0.000 claims description 4
- 239000001361 adipic acid Substances 0.000 claims description 4
- 235000010233 benzoic acid Nutrition 0.000 claims description 4
- RTHVWWAYWFJKFJ-UHFFFAOYSA-N quinolin-2-ylmethanediol Chemical compound C1=CC=CC2=NC(C(O)O)=CC=C21 RTHVWWAYWFJKFJ-UHFFFAOYSA-N 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 235000002639 sodium chloride Nutrition 0.000 claims description 2
- 239000011888 foil Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- -1 primary amine salts Chemical class 0.000 description 3
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- SMUQFGGVLNAIOZ-UHFFFAOYSA-N quinaldine Chemical compound C1=CC=CC2=NC(C)=CC=C21 SMUQFGGVLNAIOZ-UHFFFAOYSA-N 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- LIWAQLJGPBVORC-UHFFFAOYSA-N ethylmethylamine Chemical compound CCNC LIWAQLJGPBVORC-UHFFFAOYSA-N 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- DAZXVJBJRMWXJP-UHFFFAOYSA-N n,n-dimethylethylamine Chemical compound CCN(C)C DAZXVJBJRMWXJP-UHFFFAOYSA-N 0.000 description 1
- GNVRJGIVDSQCOP-UHFFFAOYSA-N n-ethyl-n-methylethanamine Chemical compound CCN(C)CC GNVRJGIVDSQCOP-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- YBRBMKDOPFTVDT-UHFFFAOYSA-N tert-butylamine Chemical compound CC(C)(C)N YBRBMKDOPFTVDT-UHFFFAOYSA-N 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- SEACXNRNJAXIBM-UHFFFAOYSA-N triethyl(methyl)azanium Chemical compound CC[N+](C)(CC)CC SEACXNRNJAXIBM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、電解コンデンサの駆動用電解液（以下、電解液と称す）に関するものであり、特に比抵抗が低く、高温での信頼性を改善した電解液に関するものである。
【０００２】
【従来の技術】
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拡大し、その表面を陽極酸化した陽極箔と、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セパレータを介在させて巻回した構造の素子に電解液を含浸後、ケースに収納し、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電極箔が使用されるようになり、コンデンサのｔａｎδが高くなっていることから、比抵抗の低い電解液が常に要求されている。従来、コストが安く、比抵抗の低い電解液としては、エチレングリコールを主溶媒としてこれに水を加え、さらに溶質としてアジピン酸、安息香酸等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、市場要求に応えるには、さらに電解液の低比抵抗化を図る必要があり、そのためには溶質濃度を高くするか、水を多量に添加しなければならない。ところが、溶質濃度を高くすると溶質が析出し、また水分を多量に添加した場合、高温下において電解液中の水分が電極箔と水和反応を起こしてガスが発生し、電解コンデンサの内圧を上昇させるため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、上記課題を解決するため、電解液に８−ヒドロキシキナルジンを添加することで、高温下で水と電極箔との水和反応を抑制し、低比抵抗で高温での信頼性に優れた電解液を提供するものである。すなわち、エチレングリコールと水とを混合した溶媒に、アジピン酸、安息香酸およびそれらの塩のうち少なくとも１種の溶質と、８−ヒドロキシキナルジン（化２）または少なくとも８位にヒドロキシ基を有するジヒドロキナルジンを添加し、該８−ヒドロキシキナルジンまたは少なくとも８位にヒドロキシ基を有するジヒドロキナルジンの添加量が、０．０１〜３．０ｗｔ％であり、水の混合量が、１０．０〜５０．０ｗｔ％であることを特徴とする電解コンデンサの駆動用電解液である。
【０００５】
【化２】
アジピン酸、安息香酸の塩としては、アンモニウム塩の他、メチルアミン、エチルアミン、ｔ−ブチルアミン等の１級アミン塩、ジメチルアミン、エチルメチルアミン、ジエチルアミン等の２級アミン塩、トリメチルアミン、ジエチルメチルアミン、エチルジメチルアミン、トリエチルアミン等の３級アミン塩、テトラメチルアンモニウム、トリエチルメチルアンモニウム、テトラエチルアンモニウム等の４級アンモニウム塩等を例示することができる。
【０００９】
【発明の実施の形態】
電解液中の８−ヒドロキシキナルジンが電極箔表面に吸着するため、１０５℃の高温下で電解液中の水と電極箔との水和が反応抑制され、水の添加量が増加してもガス発生を抑えることができる。また溶質の増量を必要としないので、溶質の析出や耐電圧を低下させることもない。また、少なくとも８位にヒドロキシ基を有するジヒドロキシキナルジンも８−ヒドロキシキナルジンと同様の効果を有する。
【００１０】
【実施例】
以下、本発明の実施例を具体的に説明する。表１の組成で電解液を調合し、３０℃における比抵抗を測定した。
【００１１】
【表１】
表１の電解液を使用して、定格６．３Ｖ−６８００μＦ（φ１２．５×２５ｍｍＬ）のアルミニウム電解コンデンサを各１０個作製し、静電容量、ｔａｎδ、漏れ電流の初期特性および高温負荷試験（１０５℃中において定格電圧を１０００時間印加）後の静電容量変化率、ｔａｎδ、漏れ電流、外観を調査した結果を表２に示す。
【００１３】
【表２】
従来例１〜２と比較例１〜３と実施例１〜１５とを比較すると、８−ヒドロキシキナルジンを添加した実施例１〜１３と、少なくとも８位にヒドロキシ基を有するジヒドロキナルジンを添加した実施例１４〜１５を電解液としたアルミニウム電解コンデンサは、１０５℃１０００時間後においても安定した特性を示したが、従来例は短時間で防爆弁が作動した。
【００１５】
８−ヒドロキシキナルジンまたは少なくとも８位にヒドロキシ基を有するジヒドロキシキナルジンの添加量は、０．０１〜３．０ｗｔ％の範囲が好ましい。０．０１ｗｔ％未満では８−ヒドロキシキナルジンまたはジヒドロキナルジンの効果が充分に得られず、３．０ｗｔ％を超えると高温負荷試験で容量変化率やｔａｎδが悪化し問題である。
【００１６】
電解液に添加する水の混合量は、１０．０〜５０．０ｗｔ％の範囲が好ましい。１０．０ｗｔ％未満では電解液の比抵抗が低くならず、５０．０ｗｔ％を超えると８−ヒドロキシキナルジンまたはジヒドロキナルジンの効果が充分得られない問題がある。
【００１７】
【発明の効果】
上記のように本発明の電解液は、低比抵抗化のために多量の水を混合しても、８−ヒドロキシキナルジンまたは少なくとも８位にヒドロキシ基を有するジヒドロキナルジンを添加することによって、高温下の安定性に優れ、比抵抗が低い電解液が得られるため、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図ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrolytic solution for driving an electrolytic capacitor (hereinafter referred to as an electrolytic solution), and particularly to an electrolytic solution having a low specific resistance and improved reliability at high temperatures.
[0002]
[Prior art]
The electrolytic capacitor was wound by etching a high-purity aluminum foil to increase the surface area, and interposing a separator between the anode foil whose surface was anodized and the etched cathode foil facing the anode foil. The element having the structure is impregnated with an electrolytic solution, then 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, with the recent miniaturization of electrolytic capacitors, electrode foils with high etching magnification are used, and the tan δ of the capacitors is high, so that an electrolyte solution with a low specific resistance is always required. Conventionally, as an electrolytic solution having a low cost and a low specific resistance, an electrolytic solution in which ethylene glycol is used as a main solvent and water is added thereto, and ammonium salts such as adipic acid and benzoic acid are dissolved as solutes has been used.
[0003]
[Problems to be solved by the invention]
However, in order to meet market demands, it is necessary to further reduce the specific resistance of the electrolytic solution. To that end, it is necessary to increase the solute concentration or to add a large amount of water. However, when the solute concentration is increased, the solute precipitates, and when a large amount of water is added, the water in the electrolyte undergoes a hydration reaction with the electrode foil at high temperatures, generating gas and increasing the internal pressure of the electrolytic capacitor. Therefore, 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 suppresses the hydration reaction between water and the electrode foil at high temperature by adding 8-hydroxyquinaldine to the electrolytic solution, and has low specific resistance and reliability at high temperature. The present invention provides an excellent electrolyte solution. That is, in a solvent in which ethylene glycol and water are mixed, at least one solute of adipic acid, benzoic acid and salts thereof, 8-hydroxyquinaldine (Chemical Formula 2) or dihydro having a hydroxy group at least at the 8-position Quinaldine is added , and the amount of 8-hydroxyquinaldine or dihydroquinaldine having a hydroxy group at least at the 8-position is 0.01 to 3.0 wt%, and the amount of water mixed is 10.0 to An electrolytic solution for driving an electrolytic capacitor characterized by being 50.0 wt% .
[0005]
[Chemical 2]
As salts of adipic acid and benzoic acid, ammonium salts, primary amine salts such as methylamine, ethylamine and t-butylamine, secondary amine salts such as dimethylamine, ethylmethylamine and diethylamine, trimethylamine and diethylmethylamine And tertiary amine salts such as ethyldimethylamine and triethylamine, and quaternary ammonium salts such as tetramethylammonium, triethylmethylammonium and tetraethylammonium.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Since 8-hydroxyquinaldine in the electrolytic solution is adsorbed on the surface of the electrode foil, the hydration of the water in the electrolytic solution and the electrode foil is suppressed at a high temperature of 105 ° C. Even if the amount of water added increases. Gas generation can be suppressed. Further, since no increase in the amount of solute is required, solute precipitation and withstand voltage are not reduced. Further, dihydroxyquinaldine having a hydroxy group at least at the 8-position has the same effect as 8-hydroxyquinaldine.
[0010]
【Example】
Examples of the present invention will be specifically described below. An electrolyte solution was prepared with the composition shown in Table 1, and the specific resistance at 30 ° C. was measured.
[0011]
[Table 1]
Using the electrolytic solution of Table 1, 10 aluminum electrolytic capacitors rated 6.3V-6800μF (φ12.5 × 25mmL) each were prepared, and the initial characteristics of electrostatic capacity, tan δ, leakage current and high temperature load test ( Table 2 shows the results of investigating the capacitance change rate, tan δ, leakage current, and appearance after applying the rated voltage at 105 ° C. for 1000 hours.
[0013]
[Table 2]
When comparing Conventional Examples 1-2, Comparative Examples 1-3, and Examples 1-15, Examples 1-13, to which 8-hydroxyquinaldine was added, and dihydroquinaldine having a hydroxy group at least at the 8-position were added. The aluminum electrolytic capacitors using Examples 14 to 15 as the electrolytic solution showed stable characteristics even after 1000 hours at 105 ° C., but the explosion-proof valve operated in a short time in the conventional example.
[0015]
The addition amount of 8-hydroxyquinaldine or dihydroxyquinaldine having a hydroxy group at least at the 8-position is preferably in the range of 0.01 to 3.0 wt%. If it is less than 0.01 wt%, the effect of 8-hydroxyquinaldine or dihydroquinaldine cannot be sufficiently obtained, and if it exceeds 3.0 wt%, the capacity change rate and tan δ are deteriorated in a high temperature load test.
[0016]
The amount of water added to the electrolytic solution is preferably in the range of 10.0 to 50.0 wt%. If the amount is less than 10.0 wt%, the specific resistance of the electrolytic solution is not lowered. If the amount exceeds 50.0 wt%, the effect of 8-hydroxyquinaldine or dihydroquinaldine cannot be sufficiently obtained.
[0017]
【The invention's effect】
As described above, the electrolytic solution of the present invention can be obtained by adding 8-hydroxyquinaldine or dihydroquinaldine having a hydroxy group at least at the 8-position, even if a large amount of water is mixed to reduce the specific resistance. Since an electrolytic solution having excellent stability under high temperature and low specific resistance can be obtained, it is possible to improve the characteristics and reliability of the electrolytic capacitor at low cost.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001008859A JP4570790B2 (en) | 2001-01-17 | 2001-01-17 | Electrolytic solution for driving electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001008859A JP4570790B2 (en) | 2001-01-17 | 2001-01-17 | Electrolytic solution for driving electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002217066A JP2002217066A (en) | 2002-08-02 |
| JP4570790B2 true JP4570790B2 (en) | 2010-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001008859A Expired - Fee Related JP4570790B2 (en) | 2001-01-17 | 2001-01-17 | Electrolytic solution for driving electrolytic capacitors |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62171905A (en) * | 1986-01-22 | 1987-07-28 | バスフ アクチェン ゲゼルシャフト | Manufacture of free hydroxylamine aqueous solution |
| JPH02219210A (en) * | 1989-02-20 | 1990-08-31 | Sanyo Electric Co Ltd | Electrolyte for driving electrolyte capacitor |
| JP2000182896A (en) * | 1998-12-14 | 2000-06-30 | Nichicon Corp | Electrolyte solution for driving aluminum electrolytic capacitors |
-
2001
- 2001-01-17 JP JP2001008859A patent/JP4570790B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62171905A (en) * | 1986-01-22 | 1987-07-28 | バスフ アクチェン ゲゼルシャフト | Manufacture of free hydroxylamine aqueous solution |
| JPH02219210A (en) * | 1989-02-20 | 1990-08-31 | Sanyo Electric Co Ltd | Electrolyte for driving electrolyte capacitor |
| JP2000182896A (en) * | 1998-12-14 | 2000-06-30 | Nichicon Corp | Electrolyte solution for driving aluminum electrolytic capacitors |
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| Publication number | Publication date |
|---|---|
| JP2002217066A (en) | 2002-08-02 |
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