WO2002097835A1 - Condensateur electrolytique solide - Google Patents
Condensateur electrolytique solide Download PDFInfo
- Publication number
- WO2002097835A1 WO2002097835A1 PCT/JP2002/005307 JP0205307W WO02097835A1 WO 2002097835 A1 WO2002097835 A1 WO 2002097835A1 JP 0205307 W JP0205307 W JP 0205307W WO 02097835 A1 WO02097835 A1 WO 02097835A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foil
- solid electrolytic
- electrolytic capacitor
- esr
- porosity
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 144
- 239000007787 solid Substances 0.000 title claims abstract description 78
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- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 claims description 12
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- 229930192474 thiophene Natural products 0.000 claims description 6
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- 230000007423 decrease Effects 0.000 abstract description 17
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- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 3
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 3
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 3
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- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 2
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- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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- 125000003342 alkenyl group Chemical group 0.000 description 1
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- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
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- 125000005677 ethinylene group Chemical group [*:2]C#C[*:1] 0.000 description 1
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 description 1
- QFWPJPIVLCBXFJ-UHFFFAOYSA-N glymidine Chemical compound N1=CC(OCCOC)=CN=C1NS(=O)(=O)C1=CC=CC=C1 QFWPJPIVLCBXFJ-UHFFFAOYSA-N 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
- the present invention relates to a solid electrolytic capacitor using a solid electrolyte as an electrolyte.
- VRM voltage control module
- ESR electrolytic capacitor using a solid electrolyte as an electrolyte
- the drive 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.
- a large amount of power must be able to be supplied in a short period of time.
- the solid electrolytic capacitor described above has a larger capacity, smaller size, lower voltage, and even lower ESR characteristics than before. Is required.
- a description of a solid electrolytic capacitor is as follows.
- the valve metal foil such as aluminum, tantalum or niobium is etched to increase its surface area.
- the anode foil on which the anodized film is formed and the valve metal foil such as aluminum, tantalum or niobium are etched to form the cathode foil.
- a separator such as kraft paper, manila paper, glass separator or non-woven fabric made of synthetic fiber such as vinylon or polyester fiber is interposed, and any of the anode foil and the cathode foil can be used.
- the capacitor is formed by winding it with the anode lead terminal and cathode lead terminal attached to the locations.
- a solid electrolyte is formed in this capacitor element, housed in a metal case, and the opening of the metal case is sealed with a sealing resin such as epoxy resin, or sealing rubber is inserted and sealed by crimping. Things.
- the solid electrolytic capacitor having the above configuration uses a solid electrolyte having a low specific resistance of 10 ⁇ -cm or less as compared with a conventional electrolytic solution having a specific resistance of 100 ⁇ -cm order. As described above, these capacitors have excellent ESR characteristics.
- the present invention has been made in order to solve the above-mentioned problem, and has a further improved low ESR in a solid electrolytic capacitor using a solid electrolyte having a low specific resistance. It is intended to provide a solid electrolytic capacitor realizing the above. Disclosure of the invention
- the specific resistance of the electrolytic foil of the capacitor element was reduced by optimizing the porosity of the etching foil used for the electrode foil of the capacitor element. And found that it is possible to further reduce the ESR of the solid electrolytic capacitor.
- an etching foil having a porosity of 51% or less is used as an etching foil used for an anode foil of the capacitor element.
- the anode foil of the present invention can be obtained by forming, ie, anodizing, the etching foil.
- 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 the ESR is reduced, and when the foil thickness is 180 _im or less, the size is reduced. Therefore, the foil thickness is preferably 70 to 180 im.
- an etching foil having a porosity of 44% or less is used as an etching foil used for a cathode foil of the capacitor element.
- Increase the porosity of the etched foil to 4 By setting the content to 4% or less, the resistance of the cathode foil is reduced, and a solid electrolytic capacitor having an unprecedented low ESR characteristic can be realized in combination with an organic semiconductor having a low specific resistance. If the porosity exceeds 44%, the resistance increases and the desired ESR characteristics cannot be obtained. Further, it is preferable that the porosity is 10% or more, since a high capacity can be obtained.
- the thickness of the cathode foil be in the range of 50 to 180 m, because ESR can be further reduced and downsizing can be achieved.
- ESR is suitable because it can obtain characteristics equal to or higher than that of the TCNQ complex and further improves the heat resistance of the capacitor.
- 3,4-ethylenedioxythiophene having good reactivity and electric properties is preferable.
- A is alkylene or polyalkylene, and when at least one of X is S, A is alkylene, polyoxyalkylene, substituted alkylene, substituted polyoxyalkylene
- the substituent is an alkyl group, an alkenyl group, or an alkoxy group.
- 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. Further, in order to form a dielectric film, a chemical conversion is performed in a chemical conversion solution composed of a phosphoric acid aqueous solution or the like, thereby producing an anode foil.
- 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 solid electrolytic capacitor is reduced.
- the porosity is reduced to increase the conductive portion of the electrode foil to reduce the ESR, the state of the etching pit such as the depth dimension and the area ratio is reduced. Regardless, for example, even when 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 volume 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 xm or more, preferably 90; m or more, the resistance component of the anode foil is reduced and the ESR is reduced, and 180 or less, preferably 150; In this case, the volume efficiency of the capacitor is improved and the size can be reduced. Therefore, the foil thickness is preferably 70 to 180 ⁇ ] 11, and more preferably 90 to 150 zm.
- the aluminum foil is roughened by AC or chemical etching similarly to the anode foil, and the porosity is reduced to 44% or less, preferably 35% or less, and more preferably 26% or less, to produce a cathode foil. I do.
- the resistance of the cathode foil is reduced, and the ESR of the solid electrolytic capacitor is reduced.
- the porosity is 10% or more, since the etching area increases and a small capacity can be obtained.
- the thickness of the cathode foil is in the range of 50 to 180 m, preferably 70 to 150 m, and more preferably 7 Q to 100 m, the ESR can be reduced by one layer and the size can be reduced. It is preferable because it is possible.
- the resistance value per unit area of the electrode foil that is, The ESR of the capacitor can be further reduced by optimizing the resistance between the end faces of the square electrode foil (hereinafter referred to as “foil resistivity”) and the foil width and foil area.
- the electrode foil used in the present invention has a foil resistivity of 0.15 to 0.6 m ⁇ , more preferably 0.17 to 0.45 ⁇ .
- the foil width is 3 to 16 mm, preferably 5 to 14 mm. Below this range, even if the foil resistivity is reduced, the contribution of the electrolyte resistance increases and the ESR does not decrease. Beyond this range, the ESR reduction rate decreases, and the longer the capacitor element length, the lower the impregnation of the organic semiconductor and the lower the retention of electrolyte, resulting in an increase in ESR.
- the foil area needs to be 300 mm 2 or more, preferably 500 mm 2 or more. Below this range, the area of the electrode foil and electrolyte is small and the resistance does not decrease, so the ESR does not decrease. Since the solid electrolytic capacitor of the present invention uses a capacitor element formed by winding an electrode foil through a separator, a long electrode foil can be used. This provides a sufficient foil area and reduces ESR.
- an etched foil is used for the cathode foil, and an anode foil having an oxide film formed on the surface by further energizing the etched foil in a chemical solution composed of a phosphoric acid aqueous solution or the like is used. Therefore, such an electrode foil is composed of an unetched aluminum part (hereinafter referred to as residual core), an etched part, and in the case of an anode foil, an oxide film part.
- the thickness of the residual core is 50 to: L 70 wm, More preferably, the foil resistivity can be set to 0.15 to 0.6 ⁇ , and more preferably to 0.17 to 0.45mQ, by setting it to 60 to 15 Om.
- the remnant core thickness is preferably 100 / xm or less.
- a conductive polymer is used as the organic semiconductor, properties equivalent to or better than those of the ESI TCNQ complex can be obtained.
- a thiophene dielectric polymer represented by (I-Dani 1) is preferable as the conductive polymer because the heat resistance of the capacitor is improved. Among them, 3,4-ethylenedioxythiophene having good reactivity and electric properties is preferable.
- the foil width and foil length of the electrode foil must not be as small as possible, but the porosity is reduced by using a conductive polymer with low specific resistance.
- the low specific resistance characteristics of the conductive polymer can be maximized, and a low level that has never existed before can be achieved.
- This is a solid electrolytic capacitor with ESR characteristics.
- the electrode foil used in the present invention has a foil resistivity of 0.27 to 0.7 ⁇ , more preferably 0.34 to 0.55 ⁇ .
- the foil width is 1.5-4 mm, preferably 2-3 mm. Below this range, even if the foil resistivity is reduced, the contribution of the electrolyte resistance increases and the ESR does not decrease. Beyond this range, the ESR reduction rate will decrease, and the height of the capacitor will increase, exceeding the allowable range for surface mount type.
- the foil area needs to be 15 Omm 2 or more, preferably 20 Omm 2 or more. Below this range, the area of the electrode foil and electrolyte is small and the resistance does not decrease, so the ESR does not decrease. Since the solid 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. This provides a sufficient foil area and reduces ESR.
- the residual core thickness is preferably 40 to 100 m, more preferably An electrode foil of 50 to 80 m can be used.
- the polymer When a thiophene dielectric polymer represented by the following formula (1) is used as the conductive polymer, the polymer has a low specific resistance of 0.1 ⁇ ⁇ cm or less. It is suitable because the ESR of the capacitor decreases and the heat resistance of the capacitor improves. Among them, 3,4-ethylenedioxythiophene having good reactivity and electric properties is preferable.
- a chemical conversion film of 0.1 to 10 V, preferably 0.3 to 5 V on the cathode foil it is preferable to form 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 or titanium is formed on the surface of the cathode foil since the capacitance increases.
- a chemical conversion film is formed on the cathode foil, and a layer made of the above-mentioned low oxidizing metal or metal compound is formed on the chemical conversion film.
- anode lead-out terminal and the cathode lead-out terminal to the above anode foil and cathode foil, and wind them through a separator. Then, a voltage is applied in a chemical conversion solution to repair the dielectric oxide film damaged in the previous process.
- the effect of the present invention can be obtained 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.
- separator a nonwoven fabric made of synthetic fiber such as manila paper, kraft paper, glass separator, or vinylon or polyester, or a porous separator can be used.
- the extraction terminal is attached to the electrode foil
- the electrode foil of the present invention with an increased conductive portion is used, the contact resistance at the junction between the electrode foil and the extraction terminal is reduced, and the ESR of the solid electrolytic capacitor is further reduced. I do.
- TCNQ complex is placed in a cylindrical metal case made of aluminum and placed on a heated flat heater to melt and liquefy the TCNQ complex.
- the preheated capacitor element is impregnated therein, and the metal case is immersed in cooling water to cool and solidify the TCNQ complex.
- epoxy resin is injected into the case Then, heat and cure in a high-temperature atmosphere, and then apply a heating voltage to perform aging to produce a solid electrolytic capacitor.
- the capacitor element When using poly (3,4-ethylenedioxythiophene) (PEDT) which is a polymer of 3,4-ethylenedioxythiophene (EDT) as the solid electrolyte, the capacitor element It is immersed in a mixed solution prepared by mixing EDT, an oxidizing agent, and a predetermined solvent to cause a polymerization reaction of EDT in the capacitor element to form a solid electrolyte layer composed of PEDT. Then, this capacitor element is inserted into a metal case, a sealing rubber is inserted into the opening end, and the opening is crimped to complete the solid electrolytic capacitor.
- PEDT poly (3,4-ethylenedioxythiophene)
- EDT 3,4-ethylenedioxythiophene
- an EDT monomer can be used, but a monomer solution in which EDT and a volatile solvent are mixed at a volume ratio of 1: 0 to 1: 3 can also be used.
- the volatile solvent include hydrocarbons such as pentane, ethers such as tetrahydrofuran, esters such as ethyl formate, ketones such as acetone, alcohols such as methanol, and nitrogen compounds such as acetonitrile. Among them, methanol, ethanol, acetone and the like are preferable.
- an aqueous solution of ferric paratoluenesulfonate, periodic acid or iodic acid dissolved in butanol can be used, and the concentration of the oxidizing agent in the solvent is preferably 40 to 55 wt%. Better. Below this range, the ESR increases, and beyond this range, the capacitance decreases.
- the mixing ratio of EDT to the oxidizing agent is preferably in the range of 1: 0.9 to 1: 2.2 by weight, and preferably in the range of 1: 1.3 to 1: 2.0. It is more preferred. Outside this range, the ESR rises.
- the reasons are considered as follows. That is, if the amount of the oxidizing agent relative to the monomer is too large, the amount of the relatively impregnated monomer decreases, so that the amount of PEDT formed decreases and the ESR increases. On the other hand, if the amount of oxidizing agent is too small, Insufficient oxidizing agents are needed to polymerize one, reducing the amount of PEDT formed and increasing the ESR.
- Polymerizable monomers other than EDT described herein can be used.
- the polymerizable monomer any of aniline, pyrrole, furan, acetylene or a derivative thereof, which can be oxidized and polymerized by a predetermined oxidizing agent to form a conductive polymer, can be applied.
- the capacitor element When manganese dioxide is used as the inorganic electrolyte as the solid electrolyte, the capacitor element is immersed in an aqueous manganese nitrate solution and then heat-treated at 300 to 400 ° C. Then, a voltage is applied again in the chemical conversion solution, and the dielectric film damaged during the heat treatment is repaired. This manganese nitrate aqueous solution immersion, heat treatment and repair formation are repeated several times. Finally, heat treatment is performed at 400 to 500 ° C, and restoration formation is performed again.
- the capacitor element formed with manganese dioxide as a solid electrolyte in this way is housed in an outer case, and epoxy resin is injected, heated and cured, and sealed to form a solid electrolytic capacitor. Also, lead dioxide or the like can be used as such an inorganic electrolyte.
- the aluminum foil is roughened by AC etching, and further subjected to a chemical conversion to form a dielectric oxide film, thereby producing the anode foil of the present invention. Also, the aluminum foil is roughened by AC etching, and a chemical conversion film is formed on the surface to produce a cathode foil. A separator made of manila paper is interposed between the anode foil and the cathode foil, and the anode lead-out terminal and cathode lead-out terminal are attached and wound at arbitrary locations. Then, a voltage is applied in the chemical conversion solution to repair and form the dielectric oxide film damaged by the winding.
- a TCNQ complex was placed on a cylindrical metal case made of aluminum.
- the TCNQ complex is melted and liquefied by placing the body and placing it on a flat heater heated to about 280 ° C.
- the capacitor element preheated to about 300 ° C is impregnated therein, and the metal case is immediately immersed in cooling water to cool and solidify the TCNQ complex.
- a required amount of epoxy resin is poured into the case, and the resin is cured by heating in a high-temperature atmosphere. Thereafter, a rated voltage is applied between the terminals at 125 ° C for 1 hour to perform aging.
- L solid electrolytic capacitor is applied between the terminals at 125 ° C for 1 hour to perform aging.
- the thickness of the anode foil is 100 m
- the porosity after etching is 26%
- the thickness of the cathode foil is 85 m
- the thickness of the anode foil is 85 m.
- Example 11 was performed using a foil having a porosity of 19%.
- Example 1 A foil with a thickness of 100 ⁇ m and a porosity of 46% after etching was used as the anode foil, and a foil with a thickness of 50 urn and a porosity of 39% after etching was used as the cathode foil.
- Example 1 and Example 2 were used.
- a solid electrolytic capacitor was produced by the same method 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. 1 to 3.
- Example 1-4 A foil with a thickness of 100 im and a porosity of 52% after etching was used as the anode foil, and a foil with a thickness of 75 m and a porosity of 22% after etching was used as the cathode foil.
- Example 1-4 was performed.
- the anode foil has a thickness of 100 m and the porosity after etching is 52% .
- the cathode foil has a thickness of 50 urn and the porosity after etching is 39%.
- the conventional example was used by using the foil.
- Table 1 shows the comparison between the foil resistance of the anode foil and the ESR of the solid electrolytic capacitors according to Examples 11 to 11 and the conventional example.
- Examples 1 and 2, 1'-3 using the anode foil of the present invention, and Examples 1 to 4 using the cathode foil of the present invention have lower ESR than the conventional example. Is decreasing. Furthermore, in Example 1-1 using an anode foil having a porosity of 26% and a cathode foil having a porosity of 19%, the porosity was reduced to 5.8 ⁇ , and an unprecedented low ESR was realized. Further, in Example 13 using an anode foil having a porosity of 33%, ESR was reduced as compared with Example 1_2 using an anode foil having a porosity of 46%.
- the foil resistance is reduced from 23 ⁇ / m to 75 ⁇ ; L53 3 ⁇ / m. It can be seen that the conductive portion of the electrode foil has increased and the resistance has decreased.
- a capacitor element was formed in the same manner as in Example 1-1, and this capacitor element was impregnated with an electrolytic solution having a low specific resistance characteristic. Capacitor was formed.
- the electrolyte used was 75 parts of arptyrolactone and 25 parts of ethyl phthalate-dimethyl-imidazolinium.
- the obtained ESR shows a high value of 52 ⁇ , and even if the electrode foil of the present invention is used, the effect of the present invention cannot be obtained unless a solid electrolyte having low specific resistance is used as the electrolyte. found.
- a solid electrolyte As a separator, a nonwoven fabric made of vinylon fiber was used, a layer made of titanium nitride was formed on the chemical conversion film on the cathode foil, and the rest of the capacitor element was formed in the same manner as in Example 1 for repair formation. . Then, a solid electrolyte was formed as follows. A butanol solution of EDT and 45% of ferric paratoluenesulfonate was poured into a container having a forceps shape so that the weight ratio thereof was 1: 0.8 to prepare a mixed solution. Then, the capacitor element was immersed in the mixed solution for 10 seconds. Then, the mixture was heated at 120 ° C.
- Example 2 shows the same results as Example 1 and the effect of the present invention is clear.
- Example 3 The solid electrolytic capacitors prepared in the same manner as in Example 1 were referred to as Examples 3-1 and 3-2 and Conventional Example 3-1.
- the solid electrolytic capacitors prepared in the same manner as in Example 2 were used in Examples 3-3. 3 to 6, Conventional Example 3 to 1.
- Table 3 shows the porosity and foil thickness of the electrode foil used, and the ESR of these solid electrolytic capacitors.
- Example 3-1 26 100 19 85 TCNQ 17.9 Example 3-2 33 100 39 50 TCNQ 22.2
- Example 3-3 26 100 19 85 PEDT 14.3
- Example 3-4 46 100 39 50 PEDT 17.4
- Example 3-5 33 100 39 50 PEDT 18.3
- Example 3-6 52 100 22 75 PEDT 17.4 Conventional 3-1 52 100 39 50 TCNQ 23.7 Conventional 3-2 52 100 39 50 PEDT 19.7
- Example 3 shows the same results as Examples 1 and 2. Furthermore, Examples 3-1 and 3-3 using an anode foil having a porosity of 26% and a cathode foil having a porosity of 19% exhibited a higher ESR than the conventional examples 3-1 and 3-2. In each case, 5.8 m ⁇ and 5.4 mQ are also reduced, and the effect of the present invention is great. In Example 3-3 using pEDT as the solid electrolyte, the amount was reduced by 3.6 ⁇ compared to Example 3-1 using the TCNQ complex, which is unprecedented as a chip-type solid electrolytic capacitor. Low ESR characteristics are realized.
- the peak temperature of the solid electrolytic capacitors of Examples 3-3 to 3-6 using PED II as the solid electrolyte was 250. Conducted a lead-free reflow test for C, with no change in capacitance and ESR, supporting lead-free reflow It became clear that it was.
- Example 4 shows the same results as Example 1 and the effect of the present invention is clear.
- the present invention is not limited to the above embodiment, but includes etching conditions, Manufacturing conditions of the solid electrolytic capacitor such as formation conditions can be appropriately selected.
- the present invention can be applied not only to a wound type solid electrolytic capacitor but also to a laminated type.
- the aluminum foil is roughened by AC etching, and further subjected to a chemical conversion to form a dielectric oxide film, thereby producing the anode foil of the present invention. Also, the aluminum foil is roughened by AC etching, and a chemical conversion film is formed on the surface to produce a cathode foil.
- An anode lead-out terminal and a cathode lead-out terminal are attached to arbitrary places, and wound around the anode foil and the cathode foil through a separator made of manila paper. Then, a voltage is applied in the chemical conversion solution to repair and form the dielectric oxide film damaged by the winding.
- the TCNQ complex is placed in a cylindrical metal case made of aluminum and placed on a flat heater heated to about 280 ⁇ to melt the TCNQ complex.
- the capacitor element preheated to about 300 ° C is impregnated therein, and the metal case is immediately immersed in cooling water to cool and solidify the TCNQ complex.
- a required amount of epoxy resin was injected into the case, heat-cured in a high-temperature atmosphere, and then a rated voltage was applied between the terminals at 125 ° C for 1 hour to perform aging to obtain a solid electrolytic capacitor.
- Example 1-1-1 to 1-3 The foil resistivity, foil width, foil area of the anode foil and cathode foil used in Examples 1-1 to 1-3 and Comparative Examples 11 to 1 to 4 of the solid electrolytic capacitor thus formed,
- the residual core thickness and the ESR of each solid electrolytic capacitor are shown in (Table 5).
- the foil thickness of Example 1-1-1 to 1-3 was 110 m, 115 m and 140 m, respectively. (Table 5)
- the solid electrolytic capacitors of Examples 1-1 to 13 of the present invention have a low ESR of 6 ⁇ ⁇ or less, which indicates the effect of the present invention.
- the foil area was 1950 mm 2 , which was larger than that in Examples 1-1 to 11 in 8.1. It has a high value of mQ.
- one 2 foil width is 3mm or less, the foil resistivity 0. 2 2 Paiiotaomega Example 1 one 1-1 one 3 lower than, further foil surface areas of the 2 1 0 0 mm 2 embodiment Example 11:!
- Comparative Example 1 An electrolytic capacitor impregnated with an electrolytic solution having low specific resistance characteristics was prepared as (1) 5, and an electrolytic capacitor formed with manganese dioxide was formed as Comparative Example 1-6.
- the electrolyte used in Comparative Examples 1 to 5 was 75 parts of arptyrolactone and 25 parts of ethyl phthalate-dimethyl-imidazolinium.
- the obtained ESR shows high values of 52 ⁇ and 17 mQ, respectively, and even if the electrode foil of the present invention is used, the effect of the present invention can be obtained unless an organic semiconductor having low resistivity is used as an electrolyte. Turned out to be impossible.
- an embodiment using PEDT as an organic semiconductor will be described.
- a separator a nonwoven fabric made of vinylon fiber was used, a layer made of titanium nitride was formed on the chemical conversion film on the cathode foil, and the rest of the capacitor element was formed in the same manner as in Example 1 for repair formation.
- an organic semiconductor was formed as follows. A butanol solution of EDT and 45% of ferric paratoluenesulfonate was poured into a container having a forceps shape so that the weight ratio thereof was 1: 0.8 to prepare a mixed solution. Then, the capacitor element was immersed in the mixed solution for 10 seconds. Then, heating was performed at 120 ° C.
- Table 6 shows the foil resistivity, foil width, foil area, core thickness, and ESR of each solid electrolytic capacitor of the electrode foils of the example and the comparative example used here.
- the foil thickness was 115 m, 110 m, and 135 m, respectively.
- Foil resistivity Foil width Foil area ESR
- Example 2-2 0.40 11 1800 65 3.5
- Example 2 shows the same results as Example 1 and the effect of the present invention is clear.
- PEDT electrospray spray sputtering
- a nonwoven fabric made of vinylon fiber was used as a temporary separation.
- the cathode foil was formed with a layer made of titanium nitride on a chemical conversion film. Was done.
- a solid electrolyte was formed as follows. A butanol solution of EDT and 45% ferric paratoluenesulfonate was poured into a cup-shaped container so that the weight ratio thereof was 1: 0.8, and the mixture was subjected to air conditioning. Then, the capacitor element was immersed in the mixed solution for 10 seconds. Then, heating was performed at 120 ° C.
- the solid electrolytic capacitors of Examples 1 to 3 of the present invention have a low ESR of 15 ⁇ or less, which indicates the effect of the present invention.
- Comparative Examples foil resistivity 0. 7 ⁇ than 1 despite Hakumen product is greater than 3 3 5 mm 2 as in Example 1 to 3 becomes 1 7 Paiiotaomega a high value .
- the following comparative examples foil width 1. 5 mm 2 is lower than Examples 1 3 and foil resistivity 0. 3 1 ⁇ , further foil area 3 6 0 mm 2 Example 1-3 Despite being larger, it shows a high value of 20 ⁇ .
- Comparative Example 3 having a foil area of 150 mm 2 or less the foil resistivity was 0.3 2
- the ESR is as large as 19 ⁇ although it is smaller than ⁇ and Examples 1-3.
- Comparative Examples 4 and 5 capacitor elements were formed in the same manner as in Example 1, and a TCNQ complex and manganese dioxide were formed as solid electrolytes on the capacitor elements, respectively.
- the obtained ESR shows high values of 17 ⁇ and 61 mQ, respectively, and even if the electrode foil of the present invention is used, the effect of the present invention cannot be obtained unless a conductive polymer having low specific resistance is used as an electrolyte. It has been found.
- the porosity after etching of an anode foil used for a capacitor element is 51% or less
- the porosity after etching of a cathode foil is By setting the porosity to 44% or less, a solid electrolytic capacitor with unprecedented low ESR characteristics can be realized.
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- Chemical Kinetics & Catalysis (AREA)
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP02730812A EP1398805B1 (en) | 2001-05-31 | 2002-05-30 | Solid electrolytic capacitor |
US10/479,651 US7099144B2 (en) | 2001-05-31 | 2002-05-30 | Solid electrolytic capacitor |
US11/294,903 US7149075B2 (en) | 2001-05-31 | 2005-12-05 | Solid electrolytic capacitor |
Applications Claiming Priority (6)
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JP2001165940A JP2002359159A (ja) | 2001-05-31 | 2001-05-31 | 固体電解コンデンサ |
JP2001-165940 | 2001-05-31 | ||
JP2001244530A JP2003059768A (ja) | 2001-08-10 | 2001-08-10 | 固体電解コンデンサ |
JP2001-244529 | 2001-08-10 | ||
JP2001244529A JP2003059776A (ja) | 2001-08-10 | 2001-08-10 | 固体電解コンデンサ |
JP2001-244530 | 2001-08-10 |
Related Child Applications (1)
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US11/294,903 Division US7149075B2 (en) | 2001-05-31 | 2005-12-05 | Solid electrolytic capacitor |
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WO2002097835A1 true WO2002097835A1 (fr) | 2002-12-05 |
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PCT/JP2002/005307 WO2002097835A1 (fr) | 2001-05-31 | 2002-05-30 | Condensateur electrolytique solide |
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US (2) | US7099144B2 (ja) |
EP (1) | EP1398805B1 (ja) |
CN (1) | CN100423144C (ja) |
WO (1) | WO2002097835A1 (ja) |
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CN100474467C (zh) * | 2001-05-31 | 2009-04-01 | 日本贵弥功株式会社 | 电解电容器及电解电容器用的电极箔 |
WO2002097835A1 (fr) * | 2001-05-31 | 2002-12-05 | Nippon Chemi-Con Corporation | Condensateur electrolytique solide |
US7361568B2 (en) * | 2005-12-21 | 2008-04-22 | Motorola, Inc. | Embedded capacitors and methods for their fabrication and connection |
CN101840790B (zh) * | 2010-05-31 | 2012-09-05 | 福建国光电子科技股份有限公司 | 固体铝电解电容器制造过程中铝箔的处理方法 |
CN102270535B (zh) * | 2011-05-13 | 2013-10-23 | 株洲宏达电子有限公司 | 一种两步法pedt阴极片式钽电解电容器制造方法 |
CN103578773B (zh) * | 2013-11-07 | 2016-07-06 | 深圳新宙邦科技股份有限公司 | 一种电容器阴极箔和电容器及其制备方法 |
KR20180078874A (ko) * | 2016-12-30 | 2018-07-10 | 주식회사 동진쎄미켐 | 3,4-에틸렌디옥시티오펜을 포함하는 전해질, 이를 포함하는 전해 캐패시터 및 전자재료 소재 |
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WO2000019468A1 (fr) | 1998-09-30 | 2000-04-06 | Nippon Chemi-Con Corporation | Condensateur a electrolyte solide et procede de fabrication |
WO2000060620A1 (en) | 1999-04-06 | 2000-10-12 | Showa Denko K. K. | Solid electrolytic capacitor and method for producing the same |
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GB941035A (en) | 1962-08-23 | 1963-11-06 | Telegraph Condenser Co Ltd | Improvements in or relating to capacitors |
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GB1047439A (ja) | 1964-01-31 | 1900-01-01 | ||
GB1338128A (en) * | 1970-09-21 | 1973-11-21 | Matsushita Electric Ind Co Ltd | Solid electrolyte capacitor and method for producing the same |
US3666642A (en) * | 1971-03-19 | 1972-05-30 | Gen Electric | Process of forming aluminum foil |
DE3787119T2 (de) * | 1986-05-20 | 1993-12-23 | Showa Denko Kk | Elektrolytischer Kondensator des Wickeltyps. |
DE68918486T2 (de) * | 1988-03-31 | 1995-05-18 | Matsushita Electric Ind Co Ltd | Festelektrolytkondensator und Verfahren zu seiner Herstellung. |
US5140502A (en) * | 1990-03-12 | 1992-08-18 | Matsushita Electric Industrial Co., Ltd. | Solid electrolytic capacitors and method for manufacturing the same |
DE69127240T2 (de) * | 1990-05-25 | 1998-02-12 | Matsushita Electric Ind Co Ltd | Festelektrolytkondensatoren und ihr Herstellungsverfahren |
DE9017945U1 (ja) * | 1990-09-05 | 1993-02-11 | Siemens Ag, 8000 Muenchen, De | |
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TW330341B (en) | 1996-01-19 | 1998-04-21 | Murada Seisakusho Kk | Metallic thin film and method of manufacturing the same and surface acoustic wave device using the metallic thin film and the same thereof |
EP0833352A4 (en) * | 1996-04-26 | 2005-07-20 | Nippon Chemicon | SOLID ELECTROLYTE CAPACITOR AND ITS MANUFACTURE |
JPH1126320A (ja) * | 1997-07-02 | 1999-01-29 | Matsushita Electric Ind Co Ltd | アルミニウム電解コンデンサ用電極箔およびアルミニウム電解コンデンサ |
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JP3623139B2 (ja) | 1998-12-01 | 2005-02-23 | ルビコン株式会社 | 電解コンデンサ駆動用電解液及びこれを用いた電解コンデンサ |
KR100689254B1 (ko) * | 1999-03-17 | 2007-03-09 | 니폰 케미콘 가부시키가이샤 | 전해콘덴서용 전해액 |
US6426861B1 (en) | 1999-06-22 | 2002-07-30 | Lithium Power Technologies, Inc. | High energy density metallized film capacitors and methods of manufacture thereof |
JP4569729B2 (ja) | 2000-09-21 | 2010-10-27 | 日本ケミコン株式会社 | アルミ電解コンデンサ |
WO2002097835A1 (fr) | 2001-05-31 | 2002-12-05 | Nippon Chemi-Con Corporation | Condensateur electrolytique solide |
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2002
- 2002-05-30 WO PCT/JP2002/005307 patent/WO2002097835A1/ja active Application Filing
- 2002-05-30 US US10/479,651 patent/US7099144B2/en not_active Expired - Lifetime
- 2002-05-30 EP EP02730812A patent/EP1398805B1/en not_active Expired - Lifetime
- 2002-05-30 CN CNB028111435A patent/CN100423144C/zh not_active Expired - Lifetime
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2005
- 2005-12-05 US US11/294,903 patent/US7149075B2/en not_active Expired - Lifetime
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JPS5527457B1 (ja) * | 1970-12-21 | 1980-07-21 | ||
WO2000019468A1 (fr) | 1998-09-30 | 2000-04-06 | Nippon Chemi-Con Corporation | Condensateur a electrolyte solide et procede de fabrication |
WO2000060620A1 (en) | 1999-04-06 | 2000-10-12 | Showa Denko K. K. | Solid electrolytic capacitor and method for producing the same |
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Also Published As
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US20060139851A1 (en) | 2006-06-29 |
US7149075B2 (en) | 2006-12-12 |
US7099144B2 (en) | 2006-08-29 |
US20040156150A1 (en) | 2004-08-12 |
EP1398805A4 (en) | 2007-10-24 |
CN1526148A (zh) | 2004-09-01 |
EP1398805A1 (en) | 2004-03-17 |
CN100423144C (zh) | 2008-10-01 |
EP1398805B1 (en) | 2012-08-29 |
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