EP1277218A1 - Betriebselektrolyt mit korrosionsinhibitor für aluminium-elektrolytkondensator - Google Patents
Betriebselektrolyt mit korrosionsinhibitor für aluminium-elektrolytkondensatorInfo
- Publication number
- EP1277218A1 EP1277218A1 EP01929259A EP01929259A EP1277218A1 EP 1277218 A1 EP1277218 A1 EP 1277218A1 EP 01929259 A EP01929259 A EP 01929259A EP 01929259 A EP01929259 A EP 01929259A EP 1277218 A1 EP1277218 A1 EP 1277218A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- inhibitor
- operating electrolyte
- operating
- electrolyte according
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
Definitions
- the invention relates to an operating electrolyte for an aluminum electrolytic capacitor, based on glycol / boric acid / borate, containing at least traces of water, in which an inhibitor is contained as an additive to suppress a corrosive attack on the aluminum oxide layer of the capacitor.
- An aluminum electrolytic capacitor consists of two aluminum foils as electrodes, between which a separator, which is forced with an operating electrolyte, is arranged.
- An oxide layer is applied as a dielectric on the aluminum foil serving as the anode.
- a paper is usually used as the separator.
- the operating electrolyte is selected so that it has sufficient ionic conductivity, at least over the operating temperature interval, sufficient temperature resistance, resistance to electrolysis at the operating voltage and, in particular, chemical stability, so that during the operation of the electrolytic capacitor, no degassing occurs due to chemical degradation processes, which impermeability of the capacitor.
- compositions for operating electrolytes based on ethylene glycol are known from US Pat. No. 4,469,610.
- Boric acid, ammonium borate, long-chain dicarboxylic acids and salts of long-chain dicarboxylic acids are used as the conductive salts dissolved therein.
- the electrolyte contains an increasing proportion of water which arises when the boric acid is esterified with the glycol. This water leads, particularly at higher temperatures within the electrolytic capacitor, to a corrosive attack on the dielectric aluminum oxide takes place, which damages the dielectric and leads to gas evolution.
- corrosion inhibitors ie substances which suppress the corrosive attack of water on the aluminum oxide layer of the anode foil
- phosphoric acid and salts of phosphorus-containing acids serve as inhibitors.
- Other electrolytes do not use the glycol / boric acid system to prevent water from forming.
- the operating electrolyte based on glycol / boric acid is preferred due to its good forming properties of the anodic oxide and its self-extinguishing properties.
- the protective complex layer which the inhibitor forms over the anode oxide layer does not lead to a deterioration in the electrical characteristics of the electrolytic capacitor.
- attacks on the anode oxide of the capacitor were observed with complex-forming substances, which led to the reduced dielectric strength mentioned due to an increased risk of electrical breakdown.
- the suspected complexation by the inhibitor in the operating electrolyte according to the invention leads to a protective action and not to removal or thinning of the oxide.
- a further improved protective effect is obtained if the inhibitor has, in addition to the acid group mentioned, at least one further functional group which can act as an electron donor or complexing agent and therefore comprises a heteroatom with a free electron pair, an aromatic group or one of the acid groups already mentioned.
- Inhibitors based on amino acids or amino acid derivatives have particularly preferred or particularly good properties.
- Corrosion-stable or corrosion-suppressing operating electrolytes can also have an alkyldiphosphonic acid or its derivative as an inhibitor.
- the acid esters of diphosphonic acid are particularly suitable as derivatives, in particular those in which the phosphonic acid group is esterified with alkyl alcohols.
- An operating electrolyte according to the invention reacts weakly acidic and has a pH between 5 and 8.
- a common composition for an operating electrolyte according to the invention comprises approximately 20 to 40 percent by weight ammonium borate and / or boric acid, dissolved in ethylene glycol. 5 to 20 mmol / kg inhibitor are added to this solution as an additive. Other additives customary for operating electrolytes are also possible, for example to stabilize the solution.
- water-containing glycol / water mixtures are mixed with 10 mmol / kg of the respective inhibitor substance.
- the lower water content corresponds to the usual water content of a known operating electrolyte based on glycol / borate, while the higher water content is known to have a particularly strong corrosive effect on the anode oxide layer.
- No boric acid or borate was added to ensure a specific water content in the test mixtures that was constant over the entire measurement period.
- hot storage tests were carried out at 85 ° C. Thereby overlay the anode foil pieces with applied anode oxide with the test solutions and store them at the stated temperature of 85 ° C. for 8 or 70 hours. The hot storage is carried out in a sample cell, with the ethylene glycol / water mixture being overlaid with n-pentadecane to prevent water evaporation and thus to ensure a constant water content over the test period.
- the tested anode foils are then removed from the test solution, rinsed with water and checked for roughness.
- the roughness is taken as a measure of the strength of the corrosive attack on the anode foil.
- An examination of the surface with the aid of an atomic force microscope, a so-called AFM recording, is used to determine the roughness. The roughness determined is compared to that of an untreated anode foil.
- a test solution without inhibitor serves as a comparison value for the effectiveness of the inhibitors tested.
- the roughness is specified as the mean height deviation of the measuring needle scanning over the surface, which arises from the arith eti see the mean deviation of the needle from the rest position.
- the operating electrolyte is therefore ideally suited for use in aluminum electrolytic capacitors.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10020928A DE10020928C2 (de) | 2000-04-28 | 2000-04-28 | Betriebselektrolyt mit Korrosionsinhibitor für Aluminium-Elektrolytkondensator |
| DE10020928 | 2000-04-28 | ||
| PCT/DE2001/001135 WO2001084573A1 (de) | 2000-04-28 | 2001-03-23 | Betriebselektrolyt mit korrosionsinhibitor für aluminium-elektrolytkondensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1277218A1 true EP1277218A1 (de) | 2003-01-22 |
Family
ID=7640266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01929259A Withdrawn EP1277218A1 (de) | 2000-04-28 | 2001-03-23 | Betriebselektrolyt mit korrosionsinhibitor für aluminium-elektrolytkondensator |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6942819B2 (de) |
| EP (1) | EP1277218A1 (de) |
| CN (1) | CN1426591A (de) |
| DE (1) | DE10020928C2 (de) |
| WO (1) | WO2001084573A1 (de) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7807300B2 (en) * | 2006-01-31 | 2010-10-05 | Medtronic, Inc. | Resistance-stabilizing additives for electrolyte |
| US20040161671A1 (en) * | 2003-02-13 | 2004-08-19 | Medtronic, Inc. | Liquid electrolyte for an electrochemical cell |
| WO2005106598A1 (ja) * | 2004-04-28 | 2005-11-10 | Canon Kabushiki Kaisha | トナー |
| US20070176151A1 (en) * | 2006-01-31 | 2007-08-02 | Kaimin Chen | Electrolyte additive for performance stability of batteries |
| US7480130B2 (en) | 2006-03-09 | 2009-01-20 | Avx Corporation | Wet electrolytic capacitor |
| US7511943B2 (en) | 2006-03-09 | 2009-03-31 | Avx Corporation | Wet electrolytic capacitor containing a cathode coating |
| CN101114544B (zh) * | 2006-07-29 | 2010-12-29 | 广西师范大学 | 一种宽温高压铝电解电容器用工作电解液及其制备方法 |
| CN101452768B (zh) * | 2006-11-08 | 2011-08-24 | 东莞万利信新材料元件有限公司 | 一种抑制电解电容器铝箔氧化膜和水反应的处理工艺的检验方法 |
| US7649730B2 (en) | 2007-03-20 | 2010-01-19 | Avx Corporation | Wet electrolytic capacitor containing a plurality of thin powder-formed anodes |
| US7554792B2 (en) | 2007-03-20 | 2009-06-30 | Avx Corporation | Cathode coating for a wet electrolytic capacitor |
| US7460356B2 (en) | 2007-03-20 | 2008-12-02 | Avx Corporation | Neutral electrolyte for a wet electrolytic capacitor |
| CN101688845B (zh) * | 2007-03-30 | 2013-10-16 | Socpra科学工程研究与应用产品市场化公司 | 监测和/或控制在医疗过程中使用的粘合剂的固化的方法和装置 |
| US8223473B2 (en) | 2009-03-23 | 2012-07-17 | Avx Corporation | Electrolytic capacitor containing a liquid electrolyte |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3030800A1 (de) | 1980-08-14 | 1982-02-25 | Siemens AG, 1000 Berlin und 8000 München | Elektrolytkondensator |
| US4469610A (en) * | 1983-07-18 | 1984-09-04 | Nippon Chemi-Con Corporation | Electrolyte for an electrolytic capacitor |
| DE3734185A1 (de) * | 1987-10-09 | 1989-04-27 | Henkel Kgaa | Dicarbonsaeuremono-2(dodecyl(2-hydroxyethyl)-amino)ethylester, deren salze und deren verwendung als korrosionsinhibitor in waessrigen systemen |
| JPH01168016A (ja) | 1987-12-23 | 1989-07-03 | Matsushita Electric Ind Co Ltd | 電解コンデンサ駆動用電解液 |
| DE3824447A1 (de) * | 1988-07-19 | 1990-01-25 | Henkel KGaA, 4000 Düsseldorf | Alkylglykol-bis (dicarbonsaeuremonoester), deren salze und deren verwendung als korrosionsinhibitor in waessrigen systemen |
| JPH05152165A (ja) | 1991-11-29 | 1993-06-18 | Hitachi Aic Inc | 電解コンデンサ用電解液 |
| JPH07211589A (ja) | 1994-01-14 | 1995-08-11 | Hitachi Aic Inc | 電解コンデンサ用電解液 |
-
2000
- 2000-04-28 DE DE10020928A patent/DE10020928C2/de not_active Expired - Fee Related
-
2001
- 2001-03-23 US US10/258,833 patent/US6942819B2/en not_active Expired - Fee Related
- 2001-03-23 WO PCT/DE2001/001135 patent/WO2001084573A1/de not_active Ceased
- 2001-03-23 EP EP01929259A patent/EP1277218A1/de not_active Withdrawn
- 2001-03-23 CN CN01808716.7A patent/CN1426591A/zh active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0184573A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20040004806A1 (en) | 2004-01-08 |
| US6942819B2 (en) | 2005-09-13 |
| CN1426591A (zh) | 2003-06-25 |
| DE10020928C2 (de) | 2002-05-02 |
| DE10020928A1 (de) | 2001-11-08 |
| WO2001084573A1 (de) | 2001-11-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20021007 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MAGNUSSEN, OLAF Inventor name: EBEL, THOMAS Inventor name: LAUTERBORN, STEFAN Inventor name: STIPPICH, FRANK Inventor name: BEHM, JUERGEN |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: EPCOS AG |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20060509 |