WO2002097834A1 - Electrolytic capacitor and electrolytic capacitor-use electrode foil used therefor - Google Patents
Electrolytic capacitor and electrolytic capacitor-use electrode foil used therefor Download PDFInfo
- Publication number
- WO2002097834A1 WO2002097834A1 PCT/JP2002/005306 JP0205306W WO02097834A1 WO 2002097834 A1 WO2002097834 A1 WO 2002097834A1 JP 0205306 W JP0205306 W JP 0205306W WO 02097834 A1 WO02097834 A1 WO 02097834A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foil
- acid
- electrolytic capacitor
- porosity
- water
- Prior art date
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- 239000011888 foil Substances 0.000 title claims abstract description 176
- 239000003990 capacitor Substances 0.000 title claims abstract description 110
- 238000005530 etching Methods 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002904 solvent Substances 0.000 claims abstract description 23
- 150000004696 coordination complex Chemical class 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 28
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical group [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 23
- 238000004804 winding Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 26
- -1 phosphoric acid ions Chemical class 0.000 abstract description 23
- 239000003792 electrolyte Substances 0.000 abstract description 19
- 230000007423 decrease Effects 0.000 abstract description 11
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 10
- 239000007787 solid Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract 1
- 238000000804 electron spin resonance spectroscopy Methods 0.000 description 46
- 239000008151 electrolyte solution Substances 0.000 description 29
- 150000001875 compounds Chemical class 0.000 description 23
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- 238000006243 chemical reaction Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
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- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
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- 238000000926 separation method Methods 0.000 description 3
- 159000000000 sodium salts Chemical class 0.000 description 3
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- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 2
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- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
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- 235000019293 ammonium adipate Nutrition 0.000 description 2
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- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- OSBSFAARYOCBHB-UHFFFAOYSA-N tetrapropylammonium Chemical compound CCC[N+](CCC)(CCC)CCC OSBSFAARYOCBHB-UHFFFAOYSA-N 0.000 description 1
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- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 description 1
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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
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
-
- 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
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
Definitions
- Electrolytic capacitor and electrode foil for electrolytic capacitor used therefor
- the present invention relates to an electrolytic capacitor and an electrode foil for an electrolytic capacitor used therefor.
- An aluminum electrolytic capacitor generally has the following configuration. That is, the high-purity aluminum foil formed in a belt shape is chemically or electrochemically etched to expand the surface, and the expanded aluminum foil is placed in a chemical solution such as an aqueous solution of ammonium borate.
- An anode foil having an oxide film layer formed on the surface of an aluminum foil by a chemical conversion treatment, and a cathode foil having a high-purity aluminum foil subjected to a surface expansion treatment are wound through a separator to form a capacitor element. Then, the capacitor element is impregnated with a driving electrolyte and is housed in a metal bottomed cylindrical outer case. Furthermore, a sealing body made of elastic rubber is stored at the opening end of the outer case, and the opening end of the outer case is sealed by drawing to form an aluminum electrolytic capacitor.
- VRM voltage control module
- the driving frequency of microprocessors has been remarkably increased, and the power consumption has increased accordingly.
- it is required to increase the power supplied from a capacitor to prevent a voltage drop.
- it must be able to supply a large amount of power in a short period of time.
- the above-mentioned solid electrolytic capacitors are required to have higher capacitance, smaller size, lower voltage, and even lower ESR characteristics than before. Is done. Therefore, there is an attempt to further reduce the specific resistance of the electrolytic solution by including a large amount of water in the electrolytic solution.However, despite the low specific resistance of the electrolyte in such an electrolytic capacitor, the effect of reducing the ESR of the capacitor is still low. There was a problem that it was not sufficient, and the neglected characteristics were not good.
- the present invention has been made in order to solve the above-described problems, and provides an electrolytic capacitor having low ESR and an electrode foil for an electrolytic capacitor used therefor. Disclosure of the invention
- a capacitor and a water in which phosphate ions are bonded to a water-soluble metal complex are mainly contained in a capacitor element having a positive electrode foil using an etching foil having a porosity of 51% or less.
- a solvent as a component. That is, an etching foil having a porosity of 51% or less can be formed, that is, anodized to obtain the anode foil of the present invention.
- the resistance of the anode foil decreases, and when combined with a low-resistivity electrolytic solution using a water-based solvent, an electrolytic capacitor with unprecedented low ESR characteristics is realized.
- the porosity exceeds 51%, the resistance increases and the desired ESR characteristics cannot be obtained. Further, it is preferable that the porosity is 20% or more, since a high capacity can be obtained.
- the porosity of the etching foil refers to a value calculated by dividing the pore volume of the etching foil by the apparent etching foil volume.
- the foil thickness of the anode foil is 70 m or more, the resistance component of the anode foil is reduced and ESR is reduced, and when it is 150 m or less, miniaturization can be achieved. Therefore, the foil thickness is preferably 70 to 150 m.
- the electrolytic capacitor of the present invention in a capacitor element provided with a cathode foil using an etching foil having a porosity of 44% or less, a conjugate in which phosphate ions are bonded to a water-soluble metal complex and water. Contains a solvent as a main component.
- the porosity of the etching foil By controlling the porosity of the etching foil to 44% or less, the conductive portion of the cathode foil increases, the resistance of the anode foil decreases, and a low ratio using a solvent containing water as a main component is obtained.
- the electrolytic solution of resistance it is possible to realize an electrolytic capacitor with unprecedented low ESR characteristics, but if the porosity exceeds 44%, the resistance increases and the desired ESR characteristics are obtained.
- the porosity is 10% or more, a high capacity can be obtained, which is preferable.
- the thickness of the cathode foil be in the range of 50 to 100 m, because the ESR can be further reduced and the size can be reduced.
- the electrode foil of the capacitor is long and the resistance due to the electrode foil itself is essentially large, so that the ESR reduction effect of the entire capacitor is extremely large. Become.
- the metal complex is an aluminum complex
- the content of water in the solvent is 35 to 10 Owt%, because ESR of the electrolytic capacitor is reduced.
- the aluminum foil is roughened by AC etching in an etching solution consisting of hydrochloric acid aqueous solution, etc., and the porosity is reduced to 51% or less.
- a chemical conversion is performed in a chemical conversion solution composed of a phosphoric acid aqueous solution or the like, and an anode foil is prepared.
- the porosity of the etching foil is set to 51% or less, preferably 43% or less, and more preferably 37% or less, the conductive portion of the anode foil increases and the resistance decreases. ESR of electrolytic capacitor is reduced.
- the porosity is reduced to increase the conductive portion of the electrode foil to reduce the ESR, the depth of the etching pit, the area ratio, and the like are reduced. Regardless, even if the etching pits on both sides of the etching foil have different depths, the effect of the present invention is not reduced. Further, in order to secure the maximum capacity capacity efficiency, it is preferable that the porosity is 20% or more, since the etching area increases and a high capacity can be obtained.
- the foil thickness of the anode foil is 70 m or more, more preferably 90 m or more, the resistance component of the anode foil is reduced to reduce ESR, and when it is 150 or less, the volumetric efficiency of the capacitor is improved. Therefore, the foil thickness is preferably 70 to 150 ⁇ m and more preferably 90 to 150 tm because the size can be reduced. Also, the aluminum foil is roughened by AC etching or chemical etching in the same manner as the anode foil, and the porosity is reduced to 44% or less, preferably 35% or less, and more preferably 26% or less, to prepare the cathode foil. By doing so, the resistance of the cathode foil is reduced and the ESR of the electrolytic capacitor is reduced.
- the porosity is 10% or more, since the etching area increases and a high capacity can be obtained.
- the thickness of the cathode foil is in the range of 50 to 100 m, and more preferably in the range of 70 to 100 m, the ESR can be reduced by one layer and the size can be reduced, which is preferable.
- the ESR of the capacitor can be further reduced by optimizing the resistance value of the square electrode foil, that is, the resistance value between the end faces of the square electrode foil (hereinafter referred to as “foil resistance ratio”) and the foil width and foil area. it can.
- the electrode foil used in the present invention has a foil resistivity of 0.4 to 0.79 ⁇ , more preferably 0.5 to 0.60 ⁇ .
- the resistance of the electrode foil is reduced, and the ESR is reduced. Below this range, the ESR reduction effect is small, and beyond this range, the ESR reduction rate decreases.
- the foil width is 8 to 25 mm, preferably 12 to 25 mm. Below this range, even if the foil resistivity decreases, the contribution of the resistance of the electrolyte increases, and the ESR does not decrease. Exceeding this range will reduce the ESR reduction rate, making it unsuitable for small products.
- the foil area needs to be 1500 mm 2 or more, preferably 2500 mm 2 , and more preferably 5000 mm 2 or more. Below this range, the ESR does not decrease because the area of the electrode foil and electrolyte is small and the resistance value does not decrease. Since the electrolytic capacitor of the present invention uses a capacitor element formed by winding an electrode foil via a separator, a long electrode foil can be used. By this, ten A small foil area can be obtained, and ESR is reduced.
- the residual core thickness is 35 to 65 m, and more preferably Preferably, a 45 to 55 m electrode foil can be used.
- the cathode foil uses an etching foil
- the anode foil uses an etching foil that is further energized in a chemical solution such as a phosphoric acid aqueous solution to form an oxide film on the surface.
- a chemical solution such as a phosphoric acid aqueous solution to form an oxide film on the surface.
- an electrode foil is composed of an unetched aluminum portion (hereinafter referred to as residual core), an etched portion, and, in the case of an anode foil, an oxide film portion.
- residual core unetched aluminum portion
- the foil resistivity can be 0.4 to 0.79 ⁇ , more preferably 0.5 to 0.6 ⁇ .
- a chemical conversion film of 0.1 to 10 V, preferably 0.3 to 5 V on the cathode foil because ESR is reduced and high-temperature life characteristics are improved.
- a layer made of a metal compound or a metal having low oxidizability such as titanium nitride / titanium on the surface of the cathode foil because the capacitance increases.
- An electrode lead-out means is connected to each of the above anode foil and cathode foil, and wound through a separator.
- the effect of the present invention can be obtained by using the anode foil of the present invention and the conventional cathode foil described above, and the conventional anode foil and the cathode foil of the present invention.
- the maximum effect can be obtained by using both.
- separation paper manila paper, kraft paper, glass separation paper, or the like
- a nonwoven fabric made of synthetic fiber such as vinylon or polyester, or a porous separation paper can be used as the separation paper.
- the electrode drawing means When connecting the electrode drawing means to the electrode foil, if the electrode foil having the increased conductive portion of the present invention is used, the contact resistance at the junction between the electrode foil and the electrode drawing means is reduced, and the electrolytic capacitor is not used. The ESR of the sensor is further reduced.
- the capacitor element thus formed is impregnated with an electrolytic solution using the solvent containing water as a main component of the present invention, housed in a metal case having a low cylindrical shape, and a sealing rubber is attached to an opening end. Then, it is sealed by caulking.
- the content of water in the solvent is from 35 to 100 wt%, and is preferably from 35 to 75 wt% at 75 wt% or less, since the low-temperature characteristics are good.
- a conjugate in which a phosphate ion is bonded to a water-soluble metal complex is contained in the capacitor element.
- This water-soluble conjugate is composed of a chelating agent, a compound capable of forming metal ions in an aqueous solution (hereinafter referred to as a metal-forming compound) and a compound capable of forming phosphate ions (hereinafter referred to as a phosphate-forming compound). And can be obtained by dissolving in That is, in this solution, the metal formed in the solution by the chelating agent and the metal-forming compound is chelated to form a water-soluble metal complex.
- a phosphate in which a phosphate-forming compound is formed in solution reacts with the water-soluble metal complex to form a conjugate in which ion phosphate is bonded to the water-soluble metal complex (hereinafter, a water-soluble conjugate).
- the solvent used here may be any solvent that dissolves the chelating agent, the metal-forming compound, and the phosphoric acid-forming compound, and among them, water, ethylene glycol, aptyrolactone and the like are preferable.
- the water-soluble conjugate thus formed can be added to the electrolytic solution and contained in the capacitor element.
- the water-soluble composite may be attached to the electrode foil or separator by coating or the like, and may be contained in the capacitor element.
- a water-soluble conjugate can be contained in the capacitor element.
- a water-soluble binder is formed by a reaction similar to the reaction in the solvent as described above, and the electrolytic solution is impregnated into the capacitor element so that the water-soluble binder is contained in the capacitor element.
- the electrode foil is made of aluminum
- aluminum ions dissolve from the electrode foil, so that phosphate ions are added to the water-soluble aluminum complex without adding a metal-forming compound. This is preferable because a bonded conjugate can be formed.
- the water-soluble conjugate thus contained gradually releases phosphate ions into the electrolytic solution, and maintains an appropriate amount of phosphate ions in the electrolytic solution over a long period of time. And, by the phosphate ions held in this proper amount, the leaving characteristics are favorably maintained.
- a-hydroxycarboxylic acids such as citric acid, tartaric acid, dalconic acid, malic acid, lactic acid, glycolic acid, a-hydroxybutyric acid, hydroxymalonic acid, a-methylmalic acid, dihydroxytartaric acid, areresorcylic acid, —Aromatic hydroxycarboxylic acids such as resorcylic acid, trihydroxybenzoic acid, hydroxyphthalic acid, dihydroxyphthalic acid, phenoltricarboxylic acid, adrintricarbonic acid, and eriochrome cyanine R; sulfocarboxylic acids such as sulfosalicylic acid; dicyandiamide; Guanidines, galactose, sugars such as glucose, lignins such as lignosulfonate, and ethylenediaminetetraacetic acid (EDTA), tri-triacetate (NTA), glycol ether di
- the metal-forming compound examples include a metal and a metal compound.
- a metal that forms a complex with a chelating agent such as aluminum, iron, copper, nickel, manganese, zinc, calcium, magnesium, barium, lead, titanium, niobium, and tantalum can be used.
- a chelating agent such as aluminum, iron, copper, nickel, manganese, zinc, calcium, magnesium, barium, lead, titanium, niobium, and tantalum
- compounds that generate metal ions in a solvent such as oxides, hydroxides, chlorides, and metal salts such as sulfates and carbonates can be used. Of these, aluminum is preferred.
- Examples of the phosphoric acid-forming compound include a phosphorus compound represented by the general formula (Chemical Formula 1), a salt thereof, a condensate thereof, and a salt of the condensate thereof. (Formula 1)
- R 2 is —H, —OH, —R 3 , — ⁇ R 4 : R 3 and R 4 are alkyl, aryl, phenyl, and ether groups)
- Examples of these phosphoric acid-generating compounds include the following. Orthophosphoric acid, phosphorous acid, hypophosphorous acid, and salts thereof, and these salts include ammonium salts, aluminum salts, sodium salts, calcium salts, and potassium salts. Orthophosphoric acid and its salts decompose in aqueous solution to produce phosphate ions. Phosphorous acid, hypophosphorous acid, and salts thereof decompose in an aqueous solution to generate phosphite ions and hypophosphite ions, and then oxidize to phosphate ions.
- phosphoric acid compounds such as ethyl phosphate, getyl phosphate, butyl phosphate, dibutyl phosphate, etc .
- phosphonic acid compounds such as 1-hydroxyethylidene-1,1-diphosphonic acid, aminotrimethylenephosphonic acid, phenylphosphonic acid, etc.
- phosphinic acid compounds such as methylphosphinic acid and butyl phosphinate are exemplified.
- the following condensed phosphoric acids or salts thereof can be mentioned.
- Linear condensed phosphoric acid such as pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, etc.
- cyclic condensed phosphoric acid such as metaphosphoric acid, hexametaphosphoric acid, or a combination of such chained and cyclic condensed phosphoric acid It is.
- salts of these condensed phosphoric acids ammonium salts, aluminum salts, sodium salts, calcium salts, potassium salts and the like can be used.
- phosphoric acid-generating compounds that generate phosphate ions in an aqueous solution or generate phosphite ions and hypophosphite ions, and then oxidize to phosphate ions.
- orthophosphoric acid or a salt thereof a condensed phosphoric acid, or a phosphoric acid compound which easily generates a phosphate ion is preferable.
- a linear condensed phosphoric acid such as orthophosphoric acid, pyrophosphoric acid, or tripolyphosphoric acid, which generates a large amount of phosphate ions relatively quickly with respect to the amount added, or a salt thereof is preferable.
- the effect of the present invention can be obtained as long as the substance generates phosphate ions in an aqueous solution.
- solute contained in the electrolyte quaternary ammonium salts, amine salts, quaternary ammonium salts, and cyclic amidine compounds, which are usually used in electrolytic solutions for electrolytic capacitors and have an anionic component as a conjugate base of an acid. Salts.
- Primary amines methylamine, ethylamine, propylamine, butylamine, ethylenediamine, etc.
- secondary amines dimethylamine, getylamine, dipropylamine, methylethylamine, diphenylamine, etc.
- amines constituting the amine salt Trimethylamine, triethylamine, tripropylamine, triphenylamine,
- the quaternary ammonium constituting the quaternary ammonium salt includes tetraalkylammonium (tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, methyltriethylammonium). , Dimethylethylammonium, etc.), and pyridium (1 -methylpyridium, 1-ethylpyridium, 1,3-getylpyridium, etc.).
- Examples of the cation constituting the quaternary salt of the cyclic amidine compound include cations obtained by quaternizing the following compounds.
- imidazole monocyclic compounds imidazole homologs such as 1-methylimidazole, 1,2-dimethylimidazole, 1,4-dimethyl-2-ethylimidazole, 1-phenylimidazole, and 1-methyl-2- Oxyalkyl derivatives such as oxymethylimidazole and 1-methyl-2-oxoshethylimidazole, 1-methyl-4 (5) -nitroimidazole, 1,2-dimethyl-5 (4) -nitro and iminoimidazole, etc.
- imidazole monocyclic compounds imidazole homologs such as 1-methylimidazole, 1,2-dimethylimidazole, 1,4-dimethyl-2-ethylimidazole, 1-phenylimidazole, and 1-methyl-2- Oxyalkyl derivatives such as oxymethylimidazole and 1-methyl-2-oxoshethylimidazole, 1-methyl-4 (5) -nitroimidazole, 1,2-dimethyl-5 (4)
- benzimidazole (1-methylbenzimidazole, 1-methyl-2-benzylbenzimidazole, etc.)
- 2- Compounds having an imidazoline ring (1-methylimidazoline, 1,2-dimethylimidazoline, 1,2,4-trimethylimidazoline, 1,4-dimethyl-2-ethyl imidazoline, 1-methyl-2-phenylimidazoline, etc.
- tetrahydro Compounds having pyrimidine ring (1-methyl-1,4,5,6-tetrahydropyrimidine, 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine, 1,8-diazabicyclo [5.4.0 Ndene-7, 1,5-diazabicyclo [4.3.0] nonene-5) and the like.
- the anion component includes adipic acid, dartaric acid, succinic acid, benzoic acid, isophthalic acid, phthalic acid, terephthalic acid, maleic acid, toluic acid, enanthic acid, malonic acid, formic acid, and 1,6-decanedicarboxylic acid
- Decane dicarboxylic acids such as 5,5,6-decane dicarboxylic acid, octane dicarboxylic acids such as 1,7-octane dicarboxylic acid, organic acids such as azelanic acid and sebacic acid, or boric acid, boric acid and polyhydric alcohol.
- conjugate bases of inorganic acids such as phosphoric acid, carbonic acid, and silicic acid.
- organic carboxylic acids such as decanedicarboxylic acid, octanedicarboxylic acid, azelaic acid, sebacic acid, adipic acid, glutaric acid, succinic acid, benzoic acid, isophthalic acid and formic acid, or boric acid, boric acid Is a multivalent alcohol complex compound of
- adipic acid or a salt thereof When at least one of adipic acid or a salt thereof is used as a solute, the ESR is further reduced.
- the content of adipic acid or a salt thereof in the electrolytic solution is 5 to 23 wt%, preferably 8 to 18 wt%. Above this range, the specific resistance decreases, and below this range, the low-temperature characteristics are good.
- the content of the other solutes is about 5 to 23% by weight, preferably 8 to 18% by weight of the whole electrolyte.
- formic acid or a salt thereof as a solute.
- Their content is 3 to 15% by weight, preferably 6 to 12% by weight in the electrolytic solution. Below this range, the effect of reducing ESR is small, and beyond this range, blistering and valve opening occur due to gas generation.
- 3-15 wt% of organic acids or ESR decreases when salt is added.
- the organic acid include the above-mentioned adipic acid and glutaric acid. Of these, adipic acid is preferred.
- a solvent containing water as a main component is used.
- a protic polar solvent as a secondary solvent, a protic polar solvent, an aprotic polar solvent, water, and a mixture thereof are used.
- Protic polar solvents include monohydric alcohols (methanol, ethanol, propanol, butanol, hexanol, cyclohexanol, cyclopentanol, benzyl alcohol, etc.), polyhydric alcohols and oxyalcohol compounds (Eg, ethylene glycol, propylene glycol, glycerin, methyl sorb, ethyl sorb, 1,3-butanediol, methoxypropylene glycol, etc.).
- Amide-based polar solvents include monohydric alcohols (methanol, ethanol, propanol, butanol, hexanol, cyclohexanol, cyclopentanol, benzyl alcohol, etc.
- nitrophenol nitrobenzoic acid, nitroacetophenone, nitrobenzyl alcohol, 2- (nitrophenoxy) ethanol, nitrooasol, nitrophenol, nitrotoluene,
- An aromatic nitro compound such as dinitrobenzene can be added.
- non-ionic surfactants polyhydric alcohols and ethylene oxide and / or acid, which can improve the withstand voltage of the electrolyte for the purpose of improving the safety of electrolytic capacitors.
- a polyoxyalkylene polyhydric alcohol ether compound obtained by addition polymerization of propylene chloride and polyvinyl alcohol can also be added.
- boric acid such as mannitol, sorbit, pentaerythritol
- complex compounds of boric acid and polysaccharides such as mannitol, sorbit, pentaerythritol
- colloidal silicic acid added to the electrolytic solution for electrolytic capacitors of the present invention.
- An oxycarboxylic acid compound or the like can be added for the purpose of reducing leakage current.
- the electrolytic capacitor of the present invention formed as described above has low ESR characteristics and good discharge characteristics.
- the aluminum foil is roughened by AC etching, and further subjected to chemical conversion to form a dielectric oxide film, thereby producing the anode foil of the present invention.
- aluminum foil is roughened by AC etching, and a conversion film is formed on the surface to create a cathode foil.
- the anode foil and the cathode foil are wound via a separator to form a capacitor element.
- the electrolytic solution for driving the aluminum electrolytic capacitor is impregnated into the capacitor element configured as described above.
- the capacitor element impregnated with this electrolyte is housed in a bottomed cylindrical aluminum outer case, a butyl rubber sealing body is inserted into the open end of the outer case, and the end of the outer case is squeezed.
- the aluminum electrolytic capacitor is sealed by processing.
- an electrolytic capacitor of 10 ⁇ 20L was prepared.
- the electrolyte used here was prepared as follows. First, 1 part of diethylenetriaminepentaacetic acid, 0.2 part of aluminum oxide, and 1.5 parts of ammonium dihydrogen phosphate are added to 10 parts of water to complete the chelating reaction and the phosphate ion binding reaction. Sex conjugate was made. Next, the aqueous solution of the water-soluble conjugate was added to an electrolyte comprising 50 parts of water, 18 parts of ethylene glycol, 10 parts of ammonium adipate and 8 parts of ammonium formate, and the electrolyte of the present invention was added. Created. (Example 1-1)
- the thickness of the anode foil is
- Example 1-1 was made using 100 rn, a foil having a porosity of 26% after etching, and a foil having a thickness of 85 ⁇ m and a porosity of 19% after etching as a cathode foil.
- a foil having a thickness of 100 im and a porosity of 46% after etching was used as the anode foil, and a foil having a thickness of 50 im and a porosity of 39% after etching was used as the cathode foil.
- An electrolytic capacitor was prepared in the same manner as in Example 1-2, except that a foil having a thickness of 100 m and a porosity of 33% after etching was used as the anode foil. It was set to 3.
- a foil having a thickness of 100 and a porosity of 52% after etching as an anode foil, and a foil having a thickness of 75 ⁇ and a porosity of 22% after etching were used as a cathode foil. 1 to 4.
- Comparative Example 1 Using a foil with a thickness of 100 m and a porosity after etching of 52% as an anode foil, and a foil with a thickness of 50 ⁇ m and a porosity of 39% after etching as a cathode foil, Comparative Example 1 was used.
- Example 2 In the same manner as in Example 1, an electrolytic capacitor having 10 ⁇ ⁇ 12.5 L was prepared. Then, those using the same electrode foils as in Examples 1-1 and 1-3 were referred to as Examples 2-1 and 2-2, and those using the same electrode foil as Comparative Example 1 were referred to as Comparative Example 2. .
- Table 1 shows the comparison between the foil resistance of the anode foil and the ESR of the electrolytic capacitors according to Example 1-1:! ⁇ 1-4 ', 2-1 and 2-2 and Comparative Examples 1 and 2. . (table 1)
- Examples 1-2 and 1-3 using the anode foil of the present invention and Examples 1-4 using the cathode foil of the present invention in the electrolytic capacitor of 10 ⁇ 20 L The ESR is lower than that of Comparative Example 1. Furthermore, in Example 11 using an anode foil having a porosity of 26% and a cathode foil having a porosity of 19%, the porosity was reduced to 8.7 ⁇ , and an unprecedented low ESR was realized. Further, ESR of Example 13 using an anode foil having a porosity of 33% is lower than that of Examples 112 using an anode foil of 46%.
- the foil resistance in example 1 is changed from 103 mQZm to 34 to 68 mQ / m, and In Fig. 7, the foil resistance was reduced from 2 13 mQ / m to 70 to 84 mQ / m, and it can be seen that the conductive portion of the electrode foil was increased and the resistance was reduced.
- a capacitor element was formed in the same manner as in Example 1-1, and this capacitor element was impregnated with an electrolytic solution containing a conventional quaternized amidinium salt as a solute to form an electrolytic capacitor.
- the electrolyte used was 75 parts of heptyl lactone and 25 parts of ethyl dimethyl-imidazolinium phthalate.
- the obtained ESR shows a high value of 29 mQ, indicating that the effect of the present invention cannot be obtained even if the electrode foil of the present invention is used without using the embodiment of the present invention containing water as a main component. There was found.
- Examples 1-1 to 1-4, 2-1 and 2-2, and a conventional example using the electrode foil of Comparative Example 1 and using the conventional electrolyte solution without adding the water-soluble binder of the present invention. was subjected to a high-temperature load and no-load test at 105 ° C. for 100 hours. As a result, good values were obtained for the example, but in the conventional example, all valves were opened several hours after the start of the test, and the electrolytic capacitor of the present invention contained a solvent containing water as a main component. Despite this, it was found that the neglected characteristics were good.
- the aluminum foil is roughened by AC etching, and further subjected to chemical conversion to form a dielectric oxide film, thereby producing the anode foil of the present invention.
- aluminum foil is roughened by AC etching, and a conversion film is formed on the surface to create a cathode foil.
- the anode foil and the cathode foil are wound through a separator to form a capacitor element.
- the electrolytic solution for driving the aluminum electrolytic capacitor is impregnated into the capacitor element configured as described above.
- the capacitor element impregnated with this electrolytic solution is housed in a bottomed cylindrical outer case made of aluminum, a butyl rubber sealing body is inserted into the open end of the outer case, and the end of the outer case is drawn. To seal the aluminum electrolytic capacitor.
- the electrolyte used here was prepared as follows. First, in 10 parts of water, 1 part of dimethylenetriaminepentaacetic acid, 0.2 parts of aluminum hydroxide, and 1.5 parts of ammonium dihydrogen phosphate was added to complete the chelation reaction and the phosphate ion binding reaction to prepare a water-soluble conjugate. Next, the aqueous solution of the water-soluble conjugate was added to an electrolytic solution consisting of 50 parts of water, 18 parts of ethylene glycol, 10 parts of ammonium adipate, and 8 parts of ammonium formate to prepare an electrolytic solution of the present invention.
- Table 2 shows the foil resistivity, foil width, foil area, residual core thickness of each electrode foil used here, and their respective ESRs.
- the ESR of the electrolytic capacitors of Examples 1 to 5 of the present invention is as low as 5-7 to 12.8 mQ.
- the foil area of 2500 mm 2 or more Example 3-4 8-9-8. Has a less 4 ⁇ and ⁇ ⁇ , Example 5 on 500 Omm 2 or more indicates a lower value as 5. 7MQ I have. '
- foil resistivity 0. 93Itaiotaomega 1 is foil width 10 mm, despite the foil area is greater than in Example 1 and 270 Omm 2, 13. 9mQ a large value Is shown.
- the foil width is 6 mm is smaller than that of Example 1-3 with the foil resistivity 0. 42Paiiotaomega, also 3900 mm 2 Example 1-3 despite the larger further foil area, 18. 8Paiiotaomega And ESR is big.
- Comparative Example 3 with a foil area of 1200 mm 2 the ESR showed a large value of 17.5 even though the foil resistivity was as low as 0.43 ⁇ .
- Comparative Example 4 a capacitor element was formed in the same manner as in Example 1, and this capacitor element was impregnated with an electrolytic solution containing a conventional quaternized amidinium salt as a solute to form an electrolytic capacitor.
- the electrolyte used was 75 parts of carpirolactone and 25 parts of ethyl phthalate-dimethyl-imidazolinium.
- the obtained ESR shows a high value of 29. ⁇ , and the effect of the present invention cannot be obtained even if the electrode foil of the present invention is used without using the embodiment containing water as a main component. There was found.
- the electrolytic capacitors of Examples 1 to 3 and the electrolytic capacitors using the electrode foils of Examples 1 to 3 and using the conventional electrolytic solution to which the water-soluble binder of the present invention was not added were used at 105 ° C and 1000 ° C.
- Time high temperature load, no load test was performed.
- good values were obtained for the examples.
- the valves were fully opened within a few hours after the start of the test, and in the electrolytic capacitors of the present invention, water was the main component. Despite containing the solvent described above, it was found that the storage characteristics were good.
- an electrolytic capacitor having an unprecedented low ESR characteristic and an excellent standing characteristic, and an electrode foil for an electrolytic capacitor used therefor.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP02733259A EP1398806A4 (en) | 2001-05-31 | 2002-05-30 | ELECTROLYTIC CAPACITOR AND ELECTRODE SHEET FOR USE IN SUCH CAPACITOR |
US10/479,650 US7054140B2 (en) | 2001-05-31 | 2002-05-30 | Electrolytic capacitor and electrode foil used for electrolytic capacitor |
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JP2001-165939 | 2001-05-31 | ||
JP2001165939A JP2002359165A (ja) | 2001-05-31 | 2001-05-31 | 電解コンデンサおよびそれに用いる電解コンデンサ用電極箔 |
JP2001-244531 | 2001-08-10 | ||
JP2001244531A JP2003059779A (ja) | 2001-08-10 | 2001-08-10 | 電解コンデンサ |
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PCT/JP2002/005306 WO2002097834A1 (en) | 2001-05-31 | 2002-05-30 | Electrolytic capacitor and electrolytic capacitor-use electrode foil used therefor |
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US (1) | US7054140B2 (ja) |
EP (1) | EP1398806A4 (ja) |
CN (1) | CN100474467C (ja) |
TW (1) | TWI221301B (ja) |
WO (1) | WO2002097834A1 (ja) |
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CN1707710B (zh) * | 2005-04-11 | 2011-01-12 | 日丰(清远)电子有限公司 | 铝电解电容器用电解液 |
CN101110298B (zh) * | 2006-12-22 | 2011-11-30 | 东莞市东阳光电容器有限公司 | 电解电容器阳极铝箔的制造方法 |
CN101004976B (zh) * | 2007-01-09 | 2010-05-19 | 东莞市东阳光电容器有限公司 | 电解电容器用电解液 |
TWI447766B (zh) * | 2009-03-31 | 2014-08-01 | Nippon Chemicon | Electrolyte for Aluminum Electrolytic Capacitors and Aluminum Electrolytic Capacitors |
KR102029464B1 (ko) * | 2011-10-21 | 2019-10-17 | 삼성전기주식회사 | 전기 이중층 캐패시터 |
CN103779094A (zh) * | 2014-01-25 | 2014-05-07 | 南通瑞达电子材料有限公司 | 电解电容器工作电解液 |
CN104966619B (zh) * | 2015-07-22 | 2018-11-16 | 湖南艾华集团股份有限公司 | 耐高纹波卷绕式固态电解电容器及生产方法 |
CN106449115A (zh) * | 2016-10-31 | 2017-02-22 | 丰宾电子(深圳)有限公司 | 一种用于充电桩的耐充放电的铝电解电容器及其应用 |
CN107256800B (zh) * | 2017-05-26 | 2020-01-17 | Oppo广东移动通信有限公司 | 电解电容和音频电路 |
JP1595451S (ja) * | 2017-06-20 | 2018-01-22 | ||
CN108048899B (zh) * | 2017-11-29 | 2019-12-24 | 铜陵兴怡金属材料有限公司 | 一种电解电容器用低压阳极箔腐蚀装置 |
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- 2002-05-30 EP EP02733259A patent/EP1398806A4/en not_active Ceased
- 2002-05-30 CN CNB028111427A patent/CN100474467C/zh not_active Expired - Lifetime
- 2002-05-30 US US10/479,650 patent/US7054140B2/en not_active Expired - Lifetime
- 2002-05-30 WO PCT/JP2002/005306 patent/WO2002097834A1/ja active Application Filing
- 2002-05-31 TW TW091111758A patent/TWI221301B/zh not_active IP Right Cessation
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EP1170761A1 (en) | 1999-03-17 | 2002-01-09 | Nippon Chemi-Con Corporation | Electrolyte for electrolytic capacitor |
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Publication number | Publication date |
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EP1398806A1 (en) | 2004-03-17 |
US20040212950A1 (en) | 2004-10-28 |
EP1398806A4 (en) | 2007-10-24 |
CN1513191A (zh) | 2004-07-14 |
TWI221301B (en) | 2004-09-21 |
CN100474467C (zh) | 2009-04-01 |
US7054140B2 (en) | 2006-05-30 |
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