JPH0797544B2 - Electrolytic capacitor, electrode foil used therefor, and method for treating the same - Google Patents
Electrolytic capacitor, electrode foil used therefor, and method for treating the sameInfo
- Publication number
- JPH0797544B2 JPH0797544B2 JP2108247A JP10824790A JPH0797544B2 JP H0797544 B2 JPH0797544 B2 JP H0797544B2 JP 2108247 A JP2108247 A JP 2108247A JP 10824790 A JP10824790 A JP 10824790A JP H0797544 B2 JPH0797544 B2 JP H0797544B2
- Authority
- JP
- Japan
- Prior art keywords
- foil
- electrolytic capacitor
- treating
- electrode foil
- cathode
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は電解コンデンサおよびこれに用いる電極箔およ
びその処理方法に関する。TECHNICAL FIELD The present invention relates to an electrolytic capacitor, an electrode foil used for the same, and a method for treating the electrode foil.
（従来の技術） 電解コンデンサ用電極箔は陽極箔と陰極箔とから成る。(Prior Art) An electrode foil for an electrolytic capacitor comprises an anode foil and a cathode foil.
一般に陽極箔はアルミニウム箔を電気化学的あるいは化
学的に表面を粗面化した後、電解液中に浸漬して陽極酸
化し、箔表面に誘電体となる酸化アルミニウム皮膜を形
成したものが用いられる。In general, the anode foil is formed by electrochemically or chemically roughening the surface of an aluminum foil and then immersing it in an electrolytic solution for anodic oxidation to form an aluminum oxide film as a dielectric on the foil surface. .
また、陰極箔はアルミニウム箔を電気化学的あるいは化
学的に表面を粗面化した後、表面の水和防止処理等をし
て形成される。The cathode foil is formed by electrochemically or chemically roughening the surface of the aluminum foil and then subjecting the surface to hydration prevention treatment.
電解コンデンサは前記陽極箔と陰極箔とをセパレータを
挟んで巻回し、電解液を含浸した後、アルミニウム等の
金属ケースに密封して構成される。The electrolytic capacitor is constructed by winding the anode foil and the cathode foil with a separator sandwiched between them, impregnating them with an electrolytic solution, and then sealing them in a metal case such as aluminum.
（発明が解決しようとする課題） 電解コンデンサの主な特性のうちの一つの高温での寿命
試験における静電容量変化率がある。これは、85℃とか
105℃といった高温雰囲気中で負荷または無負荷試験を
実施した際の試験前後の容量変化を示す特性である。(Problems to be Solved by the Invention) One of the main characteristics of electrolytic capacitors is the rate of change in capacitance in a life test at high temperature. This is 85 degrees Celsius
It is a characteristic that shows the capacity change before and after the test when a load or no load test is performed in a high temperature atmosphere of 105 ° C.
近来は、電解コンデンサの小型化に伴って使用される電
極箔もエッチング倍率が高倍率のものになってきてい
る。電極箔が高倍率になると箔表面のエッチング構造が
微細になり実効表面積が増大するので、空気や駆動用電
解液といった環境において酸化されやすくなり、上記の
寿命試験において静電容量の変化が大きかった。In recent years, with the downsizing of electrolytic capacitors, the electrode foils used have been increased in etching magnification. When the electrode foil has a high magnification, the etching structure on the foil surface becomes finer and the effective surface area increases, so it is easily oxidized in the environment such as air and driving electrolyte, and the change in capacitance was large in the above life test. .
特に、陰極箔は表面にほとんど皮膜が形成されていない
ので、容量減少を起こしやすかった。In particular, since the cathode foil has almost no film formed on its surface, the capacity was likely to decrease.
本発明は上述の問題点に鑑みてなされたものであり、容
量減少を抑制して高温寿命特性の安定した電解コンデン
サを提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an electrolytic capacitor that suppresses capacity reduction and has stable high-temperature life characteristics.
（課題を解決するための手段） 上記目的による本発明では、エッチングが施され表面が
粗面化された陰極箔の箔表面に、ケイ素を付着させたこ
とを特徴とする。ケイ素の付着量は1mg/m2以上であるこ
とが好ましい。(Means for Solving the Problem) The present invention according to the above object is characterized in that silicon is attached to the foil surface of the cathode foil which has been subjected to etching to roughen the surface. The amount of silicon deposited is preferably 1 mg / m 2 or more.
電極箔の処理方法としては、エッチングを施して表面を
粗面化した陰極箔をケイ酸を含む水溶液中に浸漬処理し
た後、熱処理を行うことを特徴とする。この水溶液はケ
イ酸のアルカリ金属塩が利用できるが、特にケイ酸ナト
リウムまたはケイ酸カリウムが望ましい。熱処理温度と
しては200℃以上が好適である。A method of treating the electrode foil is characterized in that the cathode foil having its surface roughened by etching is immersed in an aqueous solution containing silicic acid and then heat-treated. Although an alkali metal salt of silicic acid can be used in this aqueous solution, sodium silicate or potassium silicate is particularly preferable. The heat treatment temperature is preferably 200 ° C. or higher.
（作用） 電解コンデンサの寿命試験における容量減少の原因とし
ては、主として陰極箔が電解液と反応して箔表面に水和
皮膜が形成されるためと考えられる。本発明によれば、
エッチングが施され表面が粗面化された陰極箔表面に薄
いケイ素含有皮膜を形成するため、電解液中での水和反
応が抑制される。(Function) It is considered that the cause of the capacity decrease in the life test of the electrolytic capacitor is mainly that the cathode foil reacts with the electrolytic solution to form a hydrated film on the foil surface. According to the invention,
Since a thin silicon-containing film is formed on the surface of the cathode foil which has been roughened by etching, the hydration reaction in the electrolytic solution is suppressed.
（実施例） 以下、実施例に基づいて本発明を詳細に説明する。(Examples) Hereinafter, the present invention will be described in detail based on Examples.
〔実施例１〕 市販の50μｍ厚陰極用エッチド箔を用い、1wt％ケイ酸
ナトリウム水溶液中に90℃５分間浸漬した後水洗し、続
いて500℃１分の熱処理を行った。次に、この陰極箔と
市販の90μｍ厚6.3WV用陽極箔とをセパレータを挟んで
巻回し、エチレングリコール−純水−アジピン酸アンモ
ニウム系の電解液を含浸して6.3V330μＦのコンデンサ
を作製した。Example 1 Using a commercially available etched foil for a cathode having a thickness of 50 μm, it was immersed in a 1 wt% sodium silicate aqueous solution at 90 ° C. for 5 minutes, washed with water, and then heat-treated at 500 ° C. for 1 minute. Next, this cathode foil and a commercially available anode foil for 6.3 WV with a thickness of 90 μm were wound with a separator sandwiched between them, and impregnated with an ethylene glycol-pure water-ammonium adipate-based electrolytic solution to produce a 6.3 V 330 μF capacitor.
〔実施例２〕 市販の50μｍ厚陰極用エッチド箔を用い、0.5wt％ケイ
酸ナトリウム水溶液中に90℃２分間浸漬した後、500℃
１分間の熱処理を行った。次に、この陰極箔を用いて実
施例１と同様にして6.3V330μＦのコンデンサを作製し
た。[Example 2] Using a commercially available etched foil for a cathode having a thickness of 50 µm, it was immersed in a 0.5 wt% sodium silicate aqueous solution at 90 ° C for 2 minutes, and then at 500 ° C.
Heat treatment was performed for 1 minute. Then, using this cathode foil, a 6.3V 330 μF capacitor was manufactured in the same manner as in Example 1.
市販の50μｍ厚陰極用エッチド箔をそのまま使用して実
施例１と同様に6.3V330μＦのコンデンサを作製した。A commercially available 50 μm thick cathode-use etched foil was used as it was, and a 6.3V 330 μF capacitor was prepared in the same manner as in Example 1.
作製した6.3V330μＦのコンデンサについて、105℃、10
00時間の負荷および無負荷試験を実施した結果を第１表
に示した。また、第１図には負荷試験中の容量変化の経
過を示した。本発明による実施例１および２は従来例に
比較して、容量減少が著しく少なく、また、Tanδ変化
も少なく良好な特性であった。About the manufactured 6.3V 330μF capacitor, 105 ℃, 10
Table 1 shows the results of carrying out a load and no load test for 00 hours. Further, FIG. 1 shows the progress of capacity change during the load test. In Examples 1 and 2 according to the present invention, the capacity was remarkably reduced as compared with the conventional example, and the Tan δ change was also small, and the characteristics were good.
実施例１および２については、処理を行った陰極箔のSi
の付着量も示しておいた。Si付着量に関しては実験の結
果1mg/m2以上の場合に効果が現われることがわかった。For Examples 1 and 2, the treated cathode foil Si
The attached amount of is also shown. As for the Si deposition amount, it was found that the effect appears when the result is 1 mg / m 2 or more.
第２図は実施例１において熱処理温度を変化させた場合
の105℃、1000時間寿命試験後の容量変化率を示す図で
ある。熱処理温度は高い程効果が大きく、200℃以上が
好適である。FIG. 2 is a diagram showing the rate of change in capacity after a 1000-hour life test at 105 ° C. when the heat treatment temperature was changed in Example 1. The higher the heat treatment temperature, the greater the effect, and a temperature of 200 ° C. or higher is suitable.
第３図は実施例１においてケイ酸ナトリウムの濃度を変
化させた場合のコンデンサの容量変化率を示す図であ
る。ケイ酸ナトリウムの濃度は0.1wt％以上が良い。FIG. 3 is a graph showing the capacitance change rate of the capacitor when the concentration of sodium silicate was changed in Example 1. The concentration of sodium silicate should be 0.1 wt% or more.
第４図は実施例１においてケイ酸ナトリウム水溶液の温
度を変化させた場合のコンデンサの容量変化率を示す図
であり、温度が低いと効果が少なくなるので、処理温度
は50℃以上であることが望ましい。FIG. 4 is a diagram showing the capacity change rate of the capacitor when the temperature of the aqueous sodium silicate solution was changed in Example 1, and the effect decreases when the temperature is low, so the treatment temperature should be 50 ° C. or higher. Is desirable.
以上、本発明につき好適な実施例をあげて種々説明した
が、本発明はこの実施例に限定されるものではなく、発
明の精神を逸脱しない範囲内で多くの改変を施し得るの
はもちろんのことである。 Although the present invention has been variously described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.
（発明の効果） 以上述べたように、本発明によれば容量減少およびTan
δ変化の少ない電解コンデンサを得ることができるの
で、長寿命化、高信頼性化に大いに寄与できる。(Effects of the Invention) As described above, according to the present invention, capacity reduction and Tan
Since it is possible to obtain an electrolytic capacitor with a small δ change, it is possible to greatly contribute to a longer life and higher reliability.
第１図は105℃負荷試験における容量変化を示す図、第
２図は熱処理温度と容量変化率との関係を示す図、第３
図はケイ酸ナトリウム濃度と容量変化率との関係を示す
図、第４図はケイ酸ナトリウム水溶液の温度と容量変化
を示す図である。FIG. 1 is a diagram showing the capacity change in the 105 ° C. load test, FIG. 2 is a diagram showing the relationship between the heat treatment temperature and the capacity change rate, and FIG.
FIG. 4 is a diagram showing the relationship between sodium silicate concentration and capacity change rate, and FIG. 4 is a diagram showing temperature and capacity change of an aqueous sodium silicate solution.
Claims (7)
極箔の箔表面に、ケイ素を付着させたことを特徴とする
電解コンデンサ。1. An electrolytic capacitor characterized in that silicon is adhered to a foil surface of a cathode foil which has been etched and roughened.
ある請求項１記載の電解コンデンサ。2. The electrolytic capacitor according to claim 1, wherein the amount of silicon deposited on the surface of the cathode foil is 1 mg / m 2 or more.
極箔の箔表面に、ケイ素を付着させたことを特徴とする
電解コンデンサ用電極箔。3. An electrode foil for an electrolytic capacitor, characterized in that silicon is adhered to the foil surface of a cathode foil which has been subjected to etching to roughen the surface.
ある請求項３記載の電解コンデンサ用電極箔4. The electrode foil for an electrolytic capacitor according to claim 3, wherein the amount of silicon deposited on the surface of the cathode foil is 1 mg / m 2 or more.
箔をケイ酸を含む水溶液中に浸漬処理した後、熱処理を
行うことを特徴とする電解コンデンサ用電極箔の処理方
法。5. A method for treating an electrode foil for an electrolytic capacitor, which comprises subjecting a cathode foil having a surface roughened by etching to an immersion in an aqueous solution containing silicic acid, and then performing a heat treatment.
酸カリウムである請求項５記載の電解コンデンサ用電極
箔の処理方法。6. The method for treating an electrode foil for an electrolytic capacitor according to claim 5, wherein the aqueous solution is sodium silicate or potassium silicate.
５または請求項６記載の電解コンデンサ用電極箔の処理
方法。7. The method for treating an electrode foil for an electrolytic capacitor according to claim 5, wherein the heat treatment temperature is 200 ° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2108247A JPH0797544B2 (en) | 1990-04-24 | 1990-04-24 | Electrolytic capacitor, electrode foil used therefor, and method for treating the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2108247A JPH0797544B2 (en) | 1990-04-24 | 1990-04-24 | Electrolytic capacitor, electrode foil used therefor, and method for treating the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH046817A JPH046817A (en) | 1992-01-10 |
| JPH0797544B2 true JPH0797544B2 (en) | 1995-10-18 |
Family
ID=14479818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2108247A Expired - Lifetime JPH0797544B2 (en) | 1990-04-24 | 1990-04-24 | Electrolytic capacitor, electrode foil used therefor, and method for treating the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0797544B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111690972A (en) * | 2019-03-06 | 2020-09-22 | 苏州鱼得水电气科技有限公司 | Processing technology of high-temperature-resistant ceramic oxide film |
| CN115246692B (en) * | 2021-04-25 | 2023-08-08 | 中国石油化工股份有限公司 | Treatment method of adipic acid production process wastewater |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2631488B2 (en) * | 1988-02-23 | 1997-07-16 | 三菱アルミニウム株式会社 | Electrolytic capacitor electrode foil |
-
1990
- 1990-04-24 JP JP2108247A patent/JPH0797544B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH046817A (en) | 1992-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4572649B2 (en) | Method for producing electrode foil for electrolytic capacitor | |
| JPH03201522A (en) | Electrolytic capacitor, electrode foil therefor and treatment of the foil | |
| JPH0797544B2 (en) | Electrolytic capacitor, electrode foil used therefor, and method for treating the same | |
| JP2663541B2 (en) | Method for producing electrode foil for aluminum electrolytic capacitor | |
| JP3853432B2 (en) | Method for producing electrode foil for aluminum electrolytic capacitor | |
| JP4163022B2 (en) | Manufacturing method of etching foil for electrolytic capacitor | |
| JPS5825218A (en) | Method of producing low voltage electrolytic condenser electrode foil | |
| JP3480311B2 (en) | Method for producing electrode foil for aluminum electrolytic capacitor | |
| JP3976534B2 (en) | Anode foil for aluminum electrolytic capacitor and chemical conversion method thereof | |
| JP4338444B2 (en) | Manufacturing method of etching foil for electrolytic capacitor | |
| JP3248251B2 (en) | Method for producing electrode foil for aluminum electrolytic capacitor | |
| JP4213996B2 (en) | Manufacturing method of solid electrolytic capacitor | |
| JPH0777180B2 (en) | Method for manufacturing solid electrolytic capacitor | |
| JPH0337855B2 (en) | ||
| JPH09246108A (en) | Manufacture of electrode foil for aluminum electrolytic capacitor | |
| JPH07272985A (en) | Manufacturing method for anode foil for aluminum electrolytic capacitor | |
| JP3313133B2 (en) | Manufacturing method of cathode foil for electrolytic capacitor | |
| JP3453984B2 (en) | Manufacturing method of etching foil for aluminum electrolytic capacitor | |
| JPH04364019A (en) | Fabrication of electrolytic capacitor electrode foil | |
| JPH11354387A (en) | Manufacture of electrode foil for aluminum electrolytic capacitor | |
| JPH04279017A (en) | Manufacture of electrode foil for aluminum electrolytic capacitor | |
| JPH0653084A (en) | Manufacture of electrode foil for aluminum electrolytic capacitor | |
| JPH06104147A (en) | Manufacture of aluminum anode foil for low-voltage electrolytic capacitor | |
| JP2738160B2 (en) | Method for producing electrode foil for aluminum electrolytic capacitor | |
| JP3722466B2 (en) | Aluminum foil for electrolytic capacitors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101018 Year of fee payment: 15 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101018 Year of fee payment: 15 |