EP0000965A1 - Cathode foil for electrolytic capacitors - Google Patents
Cathode foil for electrolytic capacitors Download PDFInfo
- Publication number
- EP0000965A1 EP0000965A1 EP78200123A EP78200123A EP0000965A1 EP 0000965 A1 EP0000965 A1 EP 0000965A1 EP 78200123 A EP78200123 A EP 78200123A EP 78200123 A EP78200123 A EP 78200123A EP 0000965 A1 EP0000965 A1 EP 0000965A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- foil
- cathode foil
- content
- etching
- weight
- 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.)
- Granted
Links
- 239000011888 foil Substances 0.000 title claims abstract description 36
- 239000003990 capacitor Substances 0.000 title claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 239000000956 alloy Substances 0.000 claims abstract description 3
- 239000010949 copper Substances 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 2
- -1 aluminium-manganese Chemical compound 0.000 claims description 2
- 229910018131 Al-Mn Inorganic materials 0.000 abstract 1
- 229910018461 Al—Mn Inorganic materials 0.000 abstract 1
- 238000005530 etching Methods 0.000 description 13
- 239000011572 manganese Substances 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000005030 aluminium foil Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- OTRAYOBSWCVTIN-UHFFFAOYSA-N OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N Chemical compound OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N OTRAYOBSWCVTIN-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
Definitions
- the invention relates to aluminium foil for electrolytic capacitors and to cathode foil in particular and to electrolytic capacitor manufactured with this foil.
- An electrolytic aluminium foil capacitor consists of an anode foil of aluminium provided with a dielectric aluminium oxide skin obtained by anodic oxidation and an etched cathode foil of aluminium which are rolled together with a so-called separator of an insulating material to form a wound body.
- the wound body is impregnated with an electrolyte liquid and encapsulated.
- the desired capacitance is concentrated on as small a surface area as possible, which means that the metal surface area to be oxidized (forming) must be as large as possible.
- the surface of the aluminium foil obtained by rolling is subjected to an etching operation. Etching is usually performed electrolytically.
- the surface area of the cathode foil, which is encapsulated in normal capacitors in a non-formed state is also enlarged and that in the order of magnitude of the anode foil.
- Aluminium of a very high purity, namely A1 99.99% is usually used for the anode foil.
- cathode foil consisting of an aluminium-manganese alloy having a manganese content of 0.2 to 2 weight % is used in an advantageous manner. Besides the fact that this foil has a high capacitance value after etching, so that after assembly with a formed anode foil it furnishes a capacitor having a high CV value, it has, prior to etching, a high impact strength and so the foil suffers less damage when handled prior to, during and after the etching operation compared to foil to which no manganese is added.
- the cathode foil according to the invention is therefore characterized in that it has next to a manganese content of between 0.2 and 2 weught % a copper content of between 0.15 and 5.3 weight %.
- the Mn is between 0.5 and 1.5 %, Cu between 0.15 and 0.5 and Ti between 0.05 and 0.25 weight %.
- the foil according to the invention has a 20 to 30 % higher capacitance after etching with a given number of Coulombs/cm and, furthermore, an impact strength after etching with a given number of Coulombs/cm 2 which is approximately a factor of 2 higher.
- Both foils having a thickness of 60 / um were electrolytically etched in an aqueous solution of 250 g/l NaCl at different numbers of Coulombs/cm 2 .
- the capacitance values were measured in a liquid consisting of a 5% solution of ammonium- pentaborate in water (resistivity 100 ⁇ .cm) versus a silver-plated counter electrode. The impact strength after etching was determined.
- Foils were produced which, starting from A1-99.99%, contained 1% Mn and increasing quantities of Cu from 0 to 0.4%. Etching and capacitance measurement were performed as described in example 1.
- Figure 2 shows the values of the capacitance (C in /uF/cm ) versus the Cu-content (in weight %).
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Conductive Materials (AREA)
- ing And Chemical Polishing (AREA)
Abstract
Improved cathode foil of an Al-Mn alloy for electrolytical capacitors with which a higher capacitance value and, in accordance with a further elaboration, a higher impact strength of the foil is obtained. To this end the foil has next to 0.2-2 weight % of Mn a Cu-content between 0.15 and 5.3% and preferably a Ti-content between 0.03 and 0.5%.
Description
- The invention relates to aluminium foil for electrolytic capacitors and to cathode foil in particular and to electrolytic capacitor manufactured with this foil.
- An electrolytic aluminium foil capacitor consists of an anode foil of aluminium provided with a dielectric aluminium oxide skin obtained by anodic oxidation and an etched cathode foil of aluminium which are rolled together with a so-called separator of an insulating material to form a wound body. The wound body is impregnated with an electrolyte liquid and encapsulated.
- It is important that the desired capacitance is concentrated on as small a surface area as possible, which means that the metal surface area to be oxidized (forming) must be as large as possible. To this end the surface of the aluminium foil obtained by rolling is subjected to an etching operation. Etching is usually performed electrolytically. To obtain a high capacitance per unit of surface area it is important that the surface area of the cathode foil, which is encapsulated in normal capacitors in a non-formed state, is also enlarged and that in the order of magnitude of the anode foil.
- Aluminium of a very high purity, namely A1 99.99% is usually used for the anode foil.
- According to US Specification 3,899,723 cathode foil consisting of an aluminium-manganese alloy having a manganese content of 0.2 to 2 weight % is used in an advantageous manner. Besides the fact that this foil has a high capacitance value after etching, so that after assembly with a formed anode foil it furnishes a capacitor having a high CV value, it has, prior to etching, a high impact strength and so the foil suffers less damage when handled prior to, during and after the etching operation compared to foil to which no manganese is added. The specification of this type of alloy having 0.9-1.4% Mn in accordance with the DIN standard 1725, page 1, stipulates the following maximum values for contaminations:
- However, the effects aimed at did not appear to be quite optimal and it was therefore an object of the invention to obtain a further increase in the capacitance value and a still higher impact strength of the foil after etching.
- The cathode foil according to the invention is therefore characterized in that it has next to a manganese content of between 0.2 and 2 weught % a copper content of between 0.15 and 5.3 weight %.
- In accordance with a further elaboration of the invention an increase in the impact strength in particular is obtained if furthermore the titanium content of the cathode foil is between 0.03 and 0.5 weight %.
- Preferably the Mn is between 0.5 and 1.5 %, Cu between 0.15 and 0.5 and Ti between 0.05 and 0.25 weight %.
- Compared to the foil in accordance with the above-mentioned US Patent Specification 3,899,723 the foil according to the invention has a 20 to 30 % higher capacitance after etching with a given number of Coulombs/cm and, furthermore, an impact strength after etching with a given number of Coulombs/cm2 which is approximately a factor of 2 higher.
- The latter fact enables an increased through-etching of the foil so that an additional increase of the capacitance is possible, or the choice of a thinner foil as a starting material.
- By way of non-limitative example there now follows a comparison between foil in accordance with the above-mentioned DIN specification (1) and foil according to the invention (2).The relevant compositions in % by weight are:
- Both foils, having a thickness of 60/um were electrolytically etched in an aqueous solution of 250 g/l NaCl at different numbers of Coulombs/cm2.
- The capacitance values were measured in a liquid consisting of a 5% solution of ammonium- pentaborate in water (resistivity 100Ω.cm) versus a silver-plated counter electrode. The impact strength after etching was determined.
- In Figure 1 of the accompanying drawing the capacitance measured (C in /uF/cm ) and the impact strength δ measured (in mJ/15 mm foil width) of the two foils (1) and (2) are plotted versus the number of etching Coulombs Q per cm2.
- The pronounced improvement achieved by the measure according to the invention, particularly in the practically suitable range of etching charges between 10 and 50 Coulombs/cm2 is very spectacular. When using the cathode foil according to the invention together with anode foil, a spacer and an electrolyte solution in a complete electrolytical capacitor the capacitance value per volume will be found to be correspondingly higher.
- Foils were produced which, starting from A1-99.99%, contained 1% Mn and increasing quantities of Cu from 0 to 0.4%. Etching and capacitance measurement were performed as described in example 1. Figure 2 shows the values of the capacitance (C in /uF/cm ) versus the Cu-content (in weight %).
Claims (4)
1. A cathode foil of aluminium for electrolytical capacitors consisting of an aluminium-manganese alloy having a Mn-content between 0.2 and 2 weight %, characterized in that furthermore the alloy has a copper content of between 0.15 and 5.3 weight %.
2. A cathode foil as claimed in Claim 1, characterized in that the titanium content thereof is between 0.03 and 0.5 weight %.
3. A cathode foil as claimed in Claim 2, characterized in that the copper content thereof is between 0.03 and 0.5 and the titanium content between 0.05 and 0.25.
4. An electrolytical foil capacitor in which the cathode consists of etched foil as claimed in Claim 1, 2 or 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7709231 | 1977-08-22 | ||
| NL7709231A NL7709231A (en) | 1977-08-22 | 1977-08-22 | CATHODEFOIL FOR ELECTROLYTIC CAPACITORS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0000965A1 true EP0000965A1 (en) | 1979-03-07 |
| EP0000965B1 EP0000965B1 (en) | 1980-09-03 |
Family
ID=19829045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP78200123A Expired EP0000965B1 (en) | 1977-08-22 | 1978-07-31 | Cathode foil for electrolytic capacitors |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4245276A (en) |
| EP (1) | EP0000965B1 (en) |
| JP (1) | JPS5443564A (en) |
| AT (1) | AT365856B (en) |
| CA (1) | CA1107538A (en) |
| DE (1) | DE2860139D1 (en) |
| IT (1) | IT1160599B (en) |
| NL (1) | NL7709231A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2408203A1 (en) * | 1977-11-02 | 1979-06-01 | Alusuisse | ALLIE ALUMINUM ELECTROLYTIC CAPACITOR SHEET |
| FR2452773A1 (en) * | 1979-03-27 | 1980-10-24 | Showa Aluminium Co Ltd | ALUMINUM ALLOY SHEETS FOR THE MANUFACTURE OF ELECTROLYTIC CAPACITOR CATHODES |
| EP0049115A2 (en) * | 1980-09-30 | 1982-04-07 | Showa Aluminum Kabushiki Kaisha | Aluminium alloy foil for cathode of electrolytic capacitors |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760832A (en) * | 1980-09-30 | 1982-04-13 | Showa Aluminium Co Ltd | Aluminum alloy foil for electrolytic condenser cathode |
| US4530230A (en) * | 1983-11-14 | 1985-07-23 | Aluminum Company Of America | Foil rolling method and apparatus |
| JPS63153811A (en) * | 1987-10-16 | 1988-06-27 | 昭和アルミニウム株式会社 | Aluminum alloy foil for electrolytic capacitor cathode |
| DE4430634A1 (en) | 1994-08-29 | 1996-03-07 | Hoechst Ag | Process for the production of thermally stable, color-neutral, antimony-free polyester and the products which can be produced thereafter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB945700A (en) * | 1961-08-22 | 1964-01-08 | Alusuisse | Aluminium foil |
| US3899723A (en) * | 1971-01-21 | 1975-08-12 | Alusuisse | Cathode foil for electrolytic condensers |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3498765A (en) * | 1966-09-06 | 1970-03-03 | Aluminum Co Of America | Capacitor foil composed of alloys of aluminum and cadmium or indium |
| DE1955396B2 (en) * | 1968-11-05 | 1971-09-30 | ELECTROLYTE CAPACITOR AND METHOD FOR MANUFACTURING IT | |
| US3742369A (en) * | 1969-03-13 | 1973-06-26 | R Douglass | Capacitor with fibered valve metal anode |
| US3665260A (en) * | 1970-06-01 | 1972-05-23 | Trw Inc | Alloy capacitor porous anodes |
| JPS5857897B2 (en) * | 1975-11-08 | 1983-12-22 | 松下電器産業株式会社 | Kotai Denkai Capacitor |
| US4121949A (en) * | 1976-04-30 | 1978-10-24 | P. R. Mallory & Co. Inc. | Method of making a cathode electrode for an electrolytic capacitor |
-
1977
- 1977-08-22 NL NL7709231A patent/NL7709231A/en not_active Application Discontinuation
-
1978
- 1978-07-31 DE DE7878200123T patent/DE2860139D1/en not_active Expired
- 1978-07-31 EP EP78200123A patent/EP0000965B1/en not_active Expired
- 1978-08-04 US US05/930,916 patent/US4245276A/en not_active Expired - Lifetime
- 1978-08-18 CA CA309,614A patent/CA1107538A/en not_active Expired
- 1978-08-18 IT IT68931/78A patent/IT1160599B/en active
- 1978-08-19 JP JP10137478A patent/JPS5443564A/en active Pending
- 1978-08-21 AT AT0607678A patent/AT365856B/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB945700A (en) * | 1961-08-22 | 1964-01-08 | Alusuisse | Aluminium foil |
| US3899723A (en) * | 1971-01-21 | 1975-08-12 | Alusuisse | Cathode foil for electrolytic condensers |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2408203A1 (en) * | 1977-11-02 | 1979-06-01 | Alusuisse | ALLIE ALUMINUM ELECTROLYTIC CAPACITOR SHEET |
| FR2452773A1 (en) * | 1979-03-27 | 1980-10-24 | Showa Aluminium Co Ltd | ALUMINUM ALLOY SHEETS FOR THE MANUFACTURE OF ELECTROLYTIC CAPACITOR CATHODES |
| EP0049115A2 (en) * | 1980-09-30 | 1982-04-07 | Showa Aluminum Kabushiki Kaisha | Aluminium alloy foil for cathode of electrolytic capacitors |
| EP0049115A3 (en) * | 1980-09-30 | 1984-03-28 | Showa Aluminium Corporation | Aluminium alloy foil for cathode of electrolytic capacitors |
| US4800133A (en) * | 1980-09-30 | 1989-01-24 | Showa Aluminum Corporation | Aluminum alloy foil for cathode of electrolytic capacitors |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5443564A (en) | 1979-04-06 |
| EP0000965B1 (en) | 1980-09-03 |
| ATA607678A (en) | 1981-06-15 |
| US4245276A (en) | 1981-01-13 |
| CA1107538A (en) | 1981-08-25 |
| IT7868931A0 (en) | 1978-08-18 |
| DE2860139D1 (en) | 1980-12-11 |
| AT365856B (en) | 1982-02-25 |
| NL7709231A (en) | 1979-02-26 |
| IT1160599B (en) | 1987-03-11 |
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