EP0000965B1 - Cathode foil for electrolytic capacitors - Google Patents

Cathode foil for electrolytic capacitors Download PDF

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Publication number
EP0000965B1
EP0000965B1 EP78200123A EP78200123A EP0000965B1 EP 0000965 B1 EP0000965 B1 EP 0000965B1 EP 78200123 A EP78200123 A EP 78200123A EP 78200123 A EP78200123 A EP 78200123A EP 0000965 B1 EP0000965 B1 EP 0000965B1
Authority
EP
European Patent Office
Prior art keywords
foil
cathode foil
weight
etching
aluminium
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
Application number
EP78200123A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000965A1 (en
Inventor
Arend Van Herwijnen
Pieter Marten Vogel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0000965A1 publication Critical patent/EP0000965A1/en
Application granted granted Critical
Publication of EP0000965B1 publication Critical patent/EP0000965B1/en
Expired legal-status Critical Current

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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 AI 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 weight % 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 2 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 ⁇ m were electrolytically etched in an aqueous solution of 250 g/I NaCI 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 Q.cm) versus a silver-plated counter electrode. The impact strength after etching was determined.
  • Foils were produced which, starting from Al - 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 ⁇ F/cm 2 ) versus the Cu-content (in weight %).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Conductive Materials (AREA)
  • ing And Chemical Polishing (AREA)
EP78200123A 1977-08-22 1978-07-31 Cathode foil for electrolytic capacitors Expired EP0000965B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7709231A NL7709231A (nl) 1977-08-22 1977-08-22 Kathodefolie voor elektrolytische condensatoren.
NL7709231 1977-08-22

Publications (2)

Publication Number Publication Date
EP0000965A1 EP0000965A1 (en) 1979-03-07
EP0000965B1 true 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 (it)
EP (1) EP0000965B1 (it)
JP (1) JPS5443564A (it)
AT (1) AT365856B (it)
CA (1) CA1107538A (it)
DE (1) DE2860139D1 (it)
IT (1) IT1160599B (it)
NL (1) NL7709231A (it)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164434A (en) * 1977-11-02 1979-08-14 Swiss Aluminium Ltd. Aluminum alloy capacitor foil and method of making
CH645135A5 (de) * 1979-03-27 1984-09-14 Showa Aluminium Co Ltd Aluminiumlegierungsfolie zur verwendung als kathodenfolie in elektrolytkondensatoren und verfahren zu deren herstellung.
EP0049115B1 (en) * 1980-09-30 1989-05-10 Showa Aluminum Kabushiki Kaisha Aluminium alloy foil for cathode of electrolytic capacitors
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 (ja) * 1987-10-16 1988-06-27 昭和アルミニウム株式会社 電解コンデンサ陰極用アルミニウム合金箔
DE4430634A1 (de) 1994-08-29 1996-03-07 Hoechst Ag Verfahren zur Herstellung thermostabiler, farbneutraler, antimonfreier Polyester und die danach herstellbaren Produkte

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB945700A (en) * 1961-08-22 1964-01-08 Alusuisse Aluminium foil
US3498765A (en) * 1966-09-06 1970-03-03 Aluminum Co Of America Capacitor foil composed of alloys of aluminum and cadmium or indium
DE1955396B2 (de) * 1968-11-05 1971-09-30 Elektrolytkondensator und verfahren zu seiner herstellung
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
US3899723A (en) * 1971-01-21 1975-08-12 Alusuisse Cathode foil for electrolytic condensers
JPS5857897B2 (ja) * 1975-11-08 1983-12-22 松下電器産業株式会社 コタイデンカイコンデンサ
US4121949A (en) * 1976-04-30 1978-10-24 P. R. Mallory & Co. Inc. Method of making a cathode electrode for an electrolytic capacitor

Also Published As

Publication number Publication date
IT1160599B (it) 1987-03-11
ATA607678A (de) 1981-06-15
AT365856B (de) 1982-02-25
IT7868931A0 (it) 1978-08-18
CA1107538A (en) 1981-08-25
NL7709231A (nl) 1979-02-26
DE2860139D1 (en) 1980-12-11
JPS5443564A (en) 1979-04-06
US4245276A (en) 1981-01-13
EP0000965A1 (en) 1979-03-07

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