WO2002052593A1 - Procede de fabrication d'un condensateur electrolytique - Google Patents
Procede de fabrication d'un condensateur electrolytique Download PDFInfo
- Publication number
- WO2002052593A1 WO2002052593A1 PCT/JP2001/011616 JP0111616W WO02052593A1 WO 2002052593 A1 WO2002052593 A1 WO 2002052593A1 JP 0111616 W JP0111616 W JP 0111616W WO 02052593 A1 WO02052593 A1 WO 02052593A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chemical conversion
- niobium
- electrolytic capacitor
- capacitance
- temperature
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 53
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000010955 niobium Substances 0.000 claims abstract description 29
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000007711 solidification Methods 0.000 claims abstract 2
- 230000008023 solidification Effects 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 claims description 45
- 239000000243 solution Substances 0.000 claims description 30
- 239000007864 aqueous solution Substances 0.000 claims description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 9
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 239000001361 adipic acid Substances 0.000 claims description 3
- 235000011037 adipic acid Nutrition 0.000 claims description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004327 boric acid Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000005476 soldering Methods 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000011541 reaction mixture Substances 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 20
- 238000012360 testing method Methods 0.000 description 17
- 229910052715 tantalum Inorganic materials 0.000 description 14
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 14
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000011888 foil Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 5
- 239000001741 Ammonium adipate Substances 0.000 description 5
- 235000019293 ammonium adipate Nutrition 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000010405 anode material Substances 0.000 description 4
- 238000007739 conversion coating Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000004455 differential thermal analysis Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- RHDUVDHGVHBHCL-UHFFFAOYSA-N niobium tantalum Chemical compound [Nb].[Ta] RHDUVDHGVHBHCL-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000414 polyfuran Polymers 0.000 description 1
- -1 polyparaphenylene Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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
- H01G9/0029—Processes of manufacture
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/26—Anodisation of refractory metals or alloys based thereon
Definitions
- the present invention relates to a method for manufacturing an electrolytic capacitor using niobium as a material for an anode body.
- an oxide film (chemical conversion film) of the anode material is formed on the surface of the anode body by an anodic oxidation method (chemical conversion method), and the chemical conversion film serves as a dielectric layer of the electrolytic capacitor.
- -Op is a metal whose chemical properties are very similar to those of tantalum. It has a lower specific gravity than tantalum, has a large amount of crustal reserves (about 10 times that of tantalum), has a low unit cost of kg, and has a low There have been many advantages, such as a large relative dielectric constant, and attempts have been made to use it as an anode material for electrolytic capacitors.However, as far as the inventor of the present application knows, it has yet to be commercialized. Not in.
- the niobium conversion coating is extremely unstable as a dielectric, and in particular, exhibits a irreversible change in characteristics that is sensitive to heat load. Specifically, the short-term solder heat of about 200 ° C to about 260 ° C and several seconds to several tens of seconds causes the chemical conversion film to deteriorate and deteriorate, and the capacitance to change irreversibly greatly. This is because of the shortcomings.
- Japanese Patent Application Laid-Open No. H11-329920 discloses the location of this problem and one solution.
- the method for producing a niobium electrolytic capacitor according to the present invention is characterized in that the temperature of the chemical conversion solution in the step of forming a chemical conversion film on the niobium anode body is set to a temperature equal to or higher than the freezing point of the chemical conversion solution and equal to or lower than about 40 ° C. More preferably, the temperature of the chemical conversion solution in the step of forming a chemical conversion film on the anode body is set to about 25 ° C. or less.
- Capacitance change due to heat load is improved to almost 1/3 of the conventional method.
- the niobium electrolytic capacitor manufactured according to one embodiment of the present invention is in close contact with the entire surface of a niobium sintered element as an anode body, and is provided with a chemical conversion coating layer, a cathode electrolyte layer, a cathode extraction layer, an outer shell resin layer, and the like. Are sequentially formed.
- the anode niobium foil having the chemical conversion film and the opposite cathode foil may be wound up through a separator, impregnated with the cathode electrolyte, and hermetically sealed in an outer case.
- cathode electrolyte materials include inorganic oxide semiconductors such as manganese dioxide, organic semiconductors such as TCNQ complex salts, conductive polymers such as polythiophene, polypyrrole, polyaniline, polyfuran, polyacetylene, and polyparaphenylene, and various electrolytes.
- An electrolytic solution or the like dissolved in a solvent can be used.
- an aqueous solution containing, as a solute, at least one acid selected from phosphoric acid, nitric acid, sulfuric acid, adipic acid, boric acid and salts thereof, or a salt thereof is used. It can be used as a liquid.
- the freezing point of these solutions is about 0 ° C. (or about 0 ° C. or slightly lowered temperature), although it varies slightly depending on the type and concentration of the solute.
- Example 1 A porous element was prepared by molding and sintering 60 mg of niobium fine powder with a CV product of 130,000 / F VZ g together with an embedded niobium wire. It was immersed to form a chemical conversion film at a chemical conversion voltage of 40V.
- the power supply conditions during the formation were as follows: a constant current of 5 mA was applied to each sintered element, and after reaching 40 V, the constant voltage was maintained for 4 hours.
- the bias voltage was set in Comparative Example E (65 ° C formation) and Comparative Example F (90 ° C formation) according to the prior art. Since the capacitance reduction rate by changing the voltage from 1.5 V to 10 V exceeds 30%, it is expected that it will be very difficult for circuit designers to use in practical use.
- Examples A to D formation temperature of 40 ° C. or less
- Examples A and B formation temperature 15 (° C or lower)
- the rate of decrease in capacitance is reduced to about 10%.
- This value is slightly larger than the value of 0.5% to 1% for tantalum electrolytic capacitors and aluminum electrolytic capacitors, but almost equal to the ⁇ W5R characteristic '', which is superior in bias characteristics among multilayer ceramic capacitors. Has been improved to a practical level.
- Example 2 The same tests and measurements as in Example 1 were performed under the same conditions as in Example 1 except that a 0.05% aqueous nitric acid solution was used as the chemical conversion solution. The results are shown in Table 2 (Examples G to I). [Table 2
- Example 1 50 mg of niobium fine powder with a CV product of 120,000 ⁇ FV / g was molded together with an embedded niobium wire ⁇ Used using a sintered porous element and a 0.03% sulfuric acid aqueous solution as a chemical conversion solution '' Under the same conditions as in Example 1, the same tests and measurements as in Example 1 were performed. The results are shown in Table 3 (Example I).
- Example 4 CV product 120,000 ⁇ FV / g Niobium fine powder 50 mg molded together with embedded niobium wire Using a porous element sintered and using 0.24% ammonium adipate aqueous solution as a chemical conversion liquid Under the same conditions as in Example 1, the same tests and measurements as in Example 1 were performed. The results are shown in Table 4 (Example K).
- a dense and stable chemical conversion film is formed on the surface of the niobium anode body, and the capacitance change due to heat load And the dependence of the capacitance on the bias voltage is also improved.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Powder Metallurgy (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-396466 | 2000-12-27 | ||
JP2000396466A JP4544736B2 (ja) | 2000-12-27 | 2000-12-27 | 電解コンデンサの製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002052593A1 true WO2002052593A1 (fr) | 2002-07-04 |
Family
ID=18861746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/011616 WO2002052593A1 (fr) | 2000-12-27 | 2001-12-27 | Procede de fabrication d'un condensateur electrolytique |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP4544736B2 (ja) |
WO (1) | WO2002052593A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006108173A (ja) * | 2004-09-30 | 2006-04-20 | Sanyo Electric Co Ltd | 固体電解コンデンサおよびその製造方法 |
JP5411156B2 (ja) | 2008-10-29 | 2014-02-12 | 昭和電工株式会社 | コンデンサ素子の製造方法 |
JPWO2011013375A1 (ja) | 2009-07-29 | 2013-01-07 | 昭和電工株式会社 | 固体電解コンデンサの製造方法 |
CN105849837B (zh) * | 2013-12-27 | 2018-05-04 | 昭和电工株式会社 | 钨电容器用阳极体 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57113211A (en) * | 1981-01-06 | 1982-07-14 | Tokyo Shibaura Electric Co | Method of producing niobium electrolytic condenser |
JP2000188243A (ja) * | 1998-12-22 | 2000-07-04 | Showa Denko Kk | コンデンサ |
-
2000
- 2000-12-27 JP JP2000396466A patent/JP4544736B2/ja not_active Expired - Lifetime
-
2001
- 2001-12-27 WO PCT/JP2001/011616 patent/WO2002052593A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57113211A (en) * | 1981-01-06 | 1982-07-14 | Tokyo Shibaura Electric Co | Method of producing niobium electrolytic condenser |
JP2000188243A (ja) * | 1998-12-22 | 2000-07-04 | Showa Denko Kk | コンデンサ |
Also Published As
Publication number | Publication date |
---|---|
JP4544736B2 (ja) | 2010-09-15 |
JP2002198266A (ja) | 2002-07-12 |
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