WO2020137675A1 - アルミニウム電解コンデンサ用セパレータ及びアルミニウム電解コンデンサ - Google Patents
アルミニウム電解コンデンサ用セパレータ及びアルミニウム電解コンデンサ Download PDFInfo
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- WO2020137675A1 WO2020137675A1 PCT/JP2019/049319 JP2019049319W WO2020137675A1 WO 2020137675 A1 WO2020137675 A1 WO 2020137675A1 JP 2019049319 W JP2019049319 W JP 2019049319W WO 2020137675 A1 WO2020137675 A1 WO 2020137675A1
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- WIPO (PCT)
- Prior art keywords
- separator
- electrolytic capacitor
- aluminum electrolytic
- capacitor
- conductive polymer
- Prior art date
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- 239000003990 capacitor Substances 0.000 title claims abstract description 120
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 36
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 40
- 239000008151 electrolyte solution Substances 0.000 claims abstract description 14
- 239000010406 cathode material Substances 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 6
- 238000005470 impregnation Methods 0.000 claims description 34
- 239000007787 solid Substances 0.000 description 35
- 239000000835 fiber Substances 0.000 description 34
- 229920003043 Cellulose fiber Polymers 0.000 description 18
- 239000011888 foil Substances 0.000 description 16
- 230000014759 maintenance of location Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 229920000742 Cotton Polymers 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 229920002994 synthetic fiber Polymers 0.000 description 7
- 239000012209 synthetic fiber Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
- 229920002972 Acrylic fiber Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000004815 dispersion polymer Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 244000198134 Agave sisalana Species 0.000 description 3
- 235000011624 Agave sisalana Nutrition 0.000 description 3
- 240000000907 Musa textilis Species 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000002612 dispersion medium Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- KXTSPQCZQYDUGX-UHFFFAOYSA-N 1h-imidazol-1-ium;phthalate Chemical compound [NH2+]1C=CN=C1.[NH2+]1C=CN=C1.[O-]C(=O)C1=CC=CC=C1C([O-])=O KXTSPQCZQYDUGX-UHFFFAOYSA-N 0.000 description 2
- 240000000491 Corchorus aestuans Species 0.000 description 2
- 235000011777 Corchorus aestuans Nutrition 0.000 description 2
- 235000010862 Corchorus capsularis Nutrition 0.000 description 2
- 240000000797 Hibiscus cannabinus Species 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 229920006231 aramid fiber Polymers 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 150000004693 imidazolium salts Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229920006012 semi-aromatic polyamide Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241000218631 Coniferophyta Species 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004816 paper chromatography Methods 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005728 strengthening Methods 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
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
- H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
-
- 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
- H01G9/02—Diaphragms; Separators
-
- 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
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
-
- 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
- H01G9/15—Solid electrolytic capacitors
- H01G9/151—Solid electrolytic capacitors with wound foil electrodes
-
- 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
- H01G9/145—Liquid electrolytic capacitors
-
- 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
- H01G9/15—Solid electrolytic capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Definitions
- the present invention relates to an aluminum electrolytic capacitor separator interposed between a pair of electrodes, and an aluminum electrolytic capacitor using the aluminum electrolytic capacitor separator.
- Aluminum electrolytic capacitors are used in many fields such as automobile electrical components and electronic devices.
- an aluminum solid electrolytic capacitor using a conductive polymer as a cathode material hereinafter referred to as a solid electrolytic capacitor
- a conductive polymer hybrid aluminum electrolytic capacitor using both a conductive polymer and an electrolytic solution In the following, a hybrid electrolytic capacitor
- ESR equivalent series resistance
- a solid electrolytic capacitor is wound with a separator interposed between an anode aluminum foil and a cathode aluminum foil, impregnated with a polymer solution of a conductive polymer, and contains a conductive polymer obtained by polymerization. It is manufactured by inserting the element into a case and then sealing the element.
- a separator was interposed between the anode aluminum foil and the cathode aluminum foil, the separator was wound, the conductive polymer dispersion was impregnated, and the element containing the conductive polymer obtained by drying was inserted into a case. It is made by sealing later.
- the hybrid electrolytic capacitor is manufactured by further impregnating an element containing a conductive polymer with an electrolytic solution, inserting the element into a case, and then sealing the element.
- the conduction mechanism of a normal aluminum electrolytic capacitor that uses only an electrolytic solution is ionic conduction, but the conduction mechanism of a solid electrolytic capacitor containing a conductive polymer or a hybrid electrolytic capacitor is electronic conduction. Therefore, the solid electrolytic capacitor and the hybrid electrolytic capacitor have higher responsiveness and lower ESR than ordinary aluminum electrolytic capacitors.
- Separators used in solid electrolytic capacitors and hybrid electrolytic capacitors are required to separate the electrodes from each other to prevent a short circuit defect and to hold a conductive polymer.
- a separator for a solid electrolytic capacitor and a hybrid electrolytic capacitor for example, the techniques described in Patent Documents 1 to 3 have been disclosed so far.
- the separator described in Patent Document 1 is a separator containing a fiber made of a semi-aromatic polyamide resin, which has a good familiarity with a conductive polymer. By using this separator, the electrolyte retention is improved, The ESR characteristic of the solid electrolytic capacitor can be improved.
- the separator of Patent Document 2 is a separator containing a non-fibrillated organic fiber and a fibrillated polymer and having a high water absorption rate, and a technique for reducing the ESR of a solid electrolytic capacitor is disclosed by using this separator.
- the separator of Patent Document 3 is a separator with an improved compression impregnation rate of the separator. By using this separator, the ESR of the solid electrolytic capacitor can be reduced and the capacitance can be improved.
- the separator of Patent Document 1 is a separator containing a fiber made of a semi-aromatic polyamide resin and having a good compatibility with a conductive polymer. By using this separator, the electrolyte retention property is improved, and solid electrolytic The ESR characteristic of the capacitor can be improved.
- the separator of Patent Document 2 is a separator containing a non-fibrillated organic fiber and a fibrillated polymer and having a high water absorption rate, and a technique for reducing the ESR of a solid electrolytic capacitor is disclosed by using this separator.
- the separator of Patent Document 3 is a separator with an improved compression impregnation rate of the separator. By using this separator, the ESR of the solid electrolytic capacitor can be reduced and the capacitance can be improved.
- Patent Document 2 and Patent Document 3 Conventional separators having a high water absorption rate, such as Patent Document 2 and Patent Document 3, have good absorption of a conductive polymer polymerization liquid or a dispersion solvent or dispersion medium, but impregnation of the conductive polymer itself. Was not always good. This is because when the electrode foil and the separator are wound to try to impregnate the polymer or the dispersion of the conductive polymer, the solvent or the dispersion of the polymer of the conductive polymer is dispersed, as in paper chromatography. This is because the solute or dispersoid may not be impregnated even if the medium is impregnated.
- the present invention has been made in view of the above problems, and improves the uniformity of the conductive polymer of a solid electrolytic capacitor or a hybrid electrolytic capacitor, and achieves a further reduction in ESR of the capacitor. It is intended to provide an electrolytic capacitor.
- the separator for an aluminum electrolytic capacitor of the present invention has, for example, the following configuration. That is, an aluminum electrolytic capacitor separator interposed between a pair of electrodes, the bottom surface of an element obtained by winding with the separator interposed between the pair of electrodes is immersed in an electrolytic solution for an impregnation speed of 50 seconds.
- the separator for an aluminum electrolytic capacitor is characterized below.
- an aluminum electrolytic capacitor having a pair of electrodes and a separator interposed between the pair of electrodes, wherein the separator is used.
- An aluminum electrolytic capacitor is characterized in that a conductive polymer is used as a cathode material in the pair of electrodes.
- the separator of this embodiment is a separator having an impregnation speed of 50 seconds or less.
- the impregnation rate in the present embodiment means that the bottom surface of an element having a diameter of 6 mm and a height of 18 mm obtained by winding an anode foil and a cathode foil with a separator interposed therebetween is immersed in an electrolytic solution, and an LCR meter is used to measure 120 Hz. The time required for the capacitance measured at 20°C to reach 90% or more of the rated capacitance.
- % ⁇ -butyrolactone solution was used to measure the time until the capacitance reached 90% or more of the rated capacitance.
- the width and thickness of the anode foil and cathode foil are not particularly limited.
- the electrolyte used in the electrolytic solution is not limited to the imidazolium phthalate salt, and may be an imidazolium salt modified with an ethyl group or a methyl group, an imidazolium salt having a double bond cleaved, or other divalent salts. Carboxylates may be used.
- the impregnation speed of the present embodiment is not the impregnation property of the separator alone, but is the direct measurement of the impregnation property after forming the element, and the impregnation property in the actual manufacturing process of the capacitor can be directly measured. ..
- the impregnation property and holding property of the conductive polymer can be improved and the ESR of the capacitor can be reduced. If the impregnation rate exceeds 50 seconds, the impregnation property is poor, and the amount of the conductive polymer retained may be biased inside the capacitor element, and the ESR may not be reduced.
- the electrolytic solution may drop in the direction of gravity and the capacitance may decrease. The higher the impregnation rate, the better, but it is difficult to set it to less than 5 seconds, considering the handleability of the separator, and the lower limit is about 5 seconds.
- the separator of the present embodiment is not particularly limited as to the fiber used for the separator as long as it satisfies the above impregnation rate and has sufficient strength and chemical resistance as a separator for a solid electrolytic capacitor or a hybrid electrolytic capacitor. .. Fibers used in the separator of the present embodiment include, for example, cellulose fibers and synthetic fibers.
- Cellulose fibers include natural cellulose fibers and regenerated cellulose fibers, which can be used without particular limitation. Moreover, the thing which refine
- Synthetic fibers include nylon fibers, polyester fibers, acrylic fibers, and aramid fibers, and these can be used without particular limitation. Further, the fibers may be fibrillated fibers or non-fibrillated fibers, and these fibers may be used in combination. Among these, nylon fibers are preferable from the viewpoint of affinity with the polymerization liquid or dispersion of the conductive polymer.
- Cellulosic fiber has good affinity with the polymer solution of the conductive polymer and the solvent of the dispersion, the impregnation speed is high, and the retention of the polymer solution and the dispersion of the conductive polymer is easy to increase.
- Synthetic fibers can easily form a bulky sheet and can increase the impregnation speed.
- synthetic fibers since synthetic fibers have better chemical resistance than cellulose, they do not hinder the polymerization of the conductive polymer and are less deteriorated by the conductive polymer polymerization liquid or dispersion.
- the impregnation rate of the separator can be satisfied.
- the cellulose fiber is not limited to the above-mentioned average fiber length or synthetic fiber that is not fibrillated.
- even cellulose fibers having an average fiber length of 0.4 mm and fibrillated synthetic fibers may be used by reducing the content of these fibers in the separator.
- the thickness and density of the separator of this embodiment are not particularly limited.
- the thickness is generally 20 to 100 ⁇ m, and the density is generally 0.20 to 0.60 g/cm 3 in consideration of strength and handleability during use.
- the separator employs a wet non-woven fabric formed by a papermaking method.
- the paper-making form of the separator is not particularly limited as long as the impregnation rate can be satisfied, and a paper-making form such as a fourdrinier paper, a short-net paper making, a cylinder paper making can be used, and a plurality of layers formed by these paper-making methods are combined. It may be one.
- additives such as a dispersant, a defoaming agent, and a paper strengthening agent may be added as long as the content of impurities is such that it does not affect the capacitor separator. Further, after the paper layer is formed, paper strength enhancing processing, lyophilic processing, calendar processing, embossing processing and the like may be performed.
- the separator having the above structure is used as the separator, the separator is interposed between the pair of electrodes, and the conductive polymer is used as the cathode material.
- the density of the absolutely dried separator was measured by the method specified in the B method of "JIS C 2300-2 "Cellulose paper for electrical use-Part 2: Test method” 7.0A density”.
- [Impregnation speed] The bottom surface of a device having a diameter of 6 mm and a height of 18 mm obtained by winding an anode foil having a width of 15 mm and a thickness of 100 ⁇ m and a cathode foil having a width of 15 mm and a thickness of 50 ⁇ m with a separator having a width of 18 mm wound between 1-ethyl-2,3.
- the average fiber length is measured according to JIS P 8226-2 "Pulp-Method of measuring fiber length by optical automatic analysis method-Part 2: Non-polarization method” light method”), according to Kajaani Fiberlab Ver. 4 is a value of the length load average fiber length of the contour length (center line fiber length) measured by using No. 4 (manufactured by Metso Automation).
- ESR ESR of the manufactured capacitor was measured using an LCR meter under the conditions of a temperature of 20° C. and a frequency of 100 kHz.
- Capacitance The capacitance of the produced capacitor was measured using an LCR meter under the conditions of a temperature of 20° C. and a frequency of 120 Hz.
- Capacity maintenance rate The capacity retention rate was measured only for the hybrid electrolytic capacitor. The capacitance after centrifuging the hybrid electrolytic capacitor using a centrifuge at a centrifugal acceleration of 1000 G for 5 minutes was divided by the capacitance before centrifuging, and the percentage was determined.
- hybrid electrolytic capacitor For the hybrid electrolytic capacitor, a hybrid electrolytic capacitor having a rated voltage of 80 V, a diameter of 8.0 mm and a height of 10.0 mm was produced in the same manner as the solid electrolytic capacitor except that the electrolytic solution was impregnated before the case was inserted.
- various concrete examples, comparative examples, and conventional examples of the solid electrolytic capacitor and the hybrid electrolytic capacitor according to the embodiment of the present invention will be described in detail.
- Example 1 15% by mass of cotton linter pulp, 25% by mass of jute pulp, and 35% by mass of nylon fiber were mixed to form a cylinder paper to obtain a separator of Example 1.
- the average fiber length of the cellulose fibers of this separator was 1.2 mm, the thickness was 60 ⁇ m, the density was 0.55 g/cm 3 , and the impregnation speed was 49 seconds.
- Example 2 30% by mass of mercerized bamboo pulp, 15% by mass of sisal hemp pulp, and 55% by mass of nylon fiber were mixed to form a cylinder, and a separator of Example 2 was obtained.
- the average fiber length of the cellulose fibers of this separator was 1.3 mm, the thickness was 20 ⁇ m, the density was 0.40 g/cm 3 , and the impregnation speed was 38 seconds.
- Example 3 30% by mass of cotton pulp, 30% by mass of beaten solvent-spun rayon fiber, and 40% by mass of unbeaten rayon fiber having a fiber length of 4 mm were mixed to form a cylinder, and a separator of Example 3 was obtained.
- the average fiber length of the cellulose fibers of this separator was 2.4 mm, the thickness was 90 ⁇ m, the density was 0.35 g/cm 3 , and the impregnation speed was 12 seconds.
- Example 4 10% by mass of cotton pulp, 10% by mass of kenaf pulp, and 80% by mass of acrylic fiber were mixed to form a cylinder, and a separator of Example 4 was obtained.
- the average fiber length of the cellulose fibers of this separator was 1.1 mm, the thickness was 40 ⁇ m, the density was 0.22 g/cm 3 , and the impregnation speed was 5 seconds.
- a solid electrolytic capacitor and a hybrid electrolytic capacitor were produced as aluminum electrolytic capacitors produced using the separators of the above-mentioned respective examples, reference examples, comparative examples, and conventional examples.
- Example 1 The solid electrolytic capacitor using the separator of Example 1 had a capacitance of 48 ⁇ F and an ESR of 26 m ⁇ .
- Example 2 The solid electrolytic capacitor using the separator of Example 2 had an electrostatic capacity of 47 ⁇ F and ESR of 26 m ⁇ .
- the hybrid electrolytic capacitor using the separator of Example 2 had an electrostatic capacity of 40 ⁇ F, a volume retention rate of 93%, and an ESR of 33 m ⁇ .
- Example 3 The solid electrolytic capacitor using the separator of Example 3 had an electrostatic capacity of 45 ⁇ F and an ESR of 28 m ⁇ .
- Example 4 The solid electrolytic capacitor using the separator of Example 4 had an electrostatic capacity of 44 ⁇ F and ESR of 29 m ⁇ .
- the hybrid electrolytic capacitor using the separator of Example 4 had an electrostatic capacity of 36 ⁇ F, a volume retention rate of 96%, and an ESR of 36 m ⁇ .
- the solid electrolytic capacitor using the separator of the comparative example had a capacitance of 38 ⁇ F and an ESR of 40 m ⁇ .
- the hybrid electrolytic capacitor using the separator of the comparative example had a capacitance of 28 ⁇ F, a volume retention rate of 80%, and an ESR of 45 m ⁇ .
- the solid electrolytic capacitor using the separator of Conventional Example 1 had an electrostatic capacity of 40 ⁇ F and ESR of 37 m ⁇ .
- the hybrid electrolytic capacitor using the separator of Conventional Example 1 had an electrostatic capacity of 29 ⁇ F, a volume retention rate of 82%, and an ESR of 40 m ⁇ .
- the solid electrolytic capacitor using the separator of Conventional Example 2 had an electrostatic capacity of 55 ⁇ F and ESR of 33 m ⁇ .
- the hybrid electrolytic capacitor using the separator of Conventional Example 2 had an electrostatic capacity of 32 ⁇ F, a volume retention rate of 86%, and an ESR of 32 m ⁇ .
- the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of each example have an electrostatic capacity improved by 10% or more and an ESR reduced by 10% or more as compared with the conventional solid electrolytic capacitor and the hybrid electrolytic capacitor. There is. In addition, the capacity retention rate of the hybrid electrolytic capacitors of the respective examples is as good as 90% or more. From the comparison of each example, reference example, comparative example, and each conventional example, by setting the impregnation speed of the separator within 50 seconds, the capacitance and ESR of the solid electrolytic capacitor and the hybrid electrolytic capacitor are improved, and the hybrid electrolytic The capacity retention rate of the capacitor can also be improved.
- the conductive polymer is impregnated at a high rate, the retention is high, and the retention does not decrease with time. Before or before drying the conductive polymer dispersion, it is possible to suppress uneven distribution of the amount of liquid held inside the capacitor element and reduce the ESR of the capacitor.
- this separator when used in a hybrid electrolytic capacitor, the electrolytic solution retainability is good, and since the retainability does not decrease over time, it occurs when the electrolytic solution falls in the direction of gravity when the hybrid electrolytic capacitor is used. Also, the decrease in capacitance can be suppressed.
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Abstract
Description
ハイブリッド電解コンデンサは、導電性高分子を含有した素子に、更に電解液を含浸させ、ケースに挿入した後に封口することで作製される。
これまでに、固体電解コンデンサ及びハイブリッド電解コンデンサ用セパレータとして、例えば、特許文献1乃至3に記載された技術が開示されている。
特許文献1に記載のセパレータは、半芳香族ポリアミド樹脂からなる繊維を含有した、導電性高分子との馴染みが良好なセパレータであり、このセパレータを用いることで、電解質の保持性が向上し、固体電解コンデンサのESR特性を改良できる。
また、特許文献1のような導電性高分子となじみの良いセパレータの場合、溶媒(分散媒)と溶質(分散質)の分離は起き難いが、高粘度の液体である導電性高分子の重合液や分散体の含浸自体が困難であり、コンデンサ素子内部の導電性高分子の偏りが起こる場合があるためである。
即ち、一対の電極の間に介在するアルミニウム電解コンデンサ用セパレータであって、前記一対の電極間に前記セパレータを介在させて巻回して得た素子の底面を電解液に浸した含浸速度が50秒以下であることを特徴とするアルミニウム電解コンデンサ用セパレータとする。
前記一対の電極における陰極材料として導電性高分子を用いることを特徴とするアルミニウム電解コンデンサとする。
本実施の形態例のセパレータは、含浸速度が50秒以下のセパレータである。本実施の形態における含浸速度とは、陽極箔と陰極箔とにセパレータを介在させて巻回して得た直径6mm高さ18mmの素子の底面を、電解液に浸し、LCRメーターを使用し、120Hz、20℃で測定した静電容量が、定格静電容量の90%以上になるまでの時間を指す。
含浸速度が50秒を超過した場合、含浸性が悪く、コンデンサ素子内部で導電性高分子の保持量の偏りが起き、ESRの低減ができない場合がある。また、ハイブリッド電解コンデンサに使用した場合、電解液の保持性が低いため、ハイブリッド電解コンデンサの使用時に、電解液が重力方向に落下し、静電容量が減少する場合がある。
含浸速度は、速いほどよいが、セパレータの取扱性等を考慮すると、5秒未満とすることは困難であり、5秒程度が下限となる。
本実施の形態例のセパレータに用いる繊維として、例えばセルロース繊維と合成繊維とを挙げることができる。
しかしながら、上記した本実施の形態例の含浸速度範囲を満足できれば、上記平均繊維長のセルロース繊維や、フィブリル化していない合成繊維に限定されるものではない。例えば、平均繊維長0.4mmのセルロース繊維や、フィブリル化合成繊維であっても、セパレータ中のこれら繊維の含有量を少なくする等により使用してもよい。
更に、紙層形成後に紙力増強加工、親液加工、カレンダ加工、エンボス加工等の加工を施してもよい。
本実施の形態のセパレータおよびアルミニウム電解コンデンサの各特性の具体的な測定は、以下の条件および方法で行った。
〔厚さ〕
「JIS C 2300-2 『電気用セルロース紙-第2部:試験方法』 5.1 厚さ」に規定された、「5.1.1 測定器および測定方法 a外側マイクロメータを用いる場合」のマイクロメータを用いて、「5.1.3 紙を折り重ねて厚さを測る場合」の10枚に折り重ねる方法で、セパレータの厚さを測定した。
「JIS C 2300-2 『電気用セルロース紙-第2部:試験方法』 7.0A 密度」のB法に規定された方法で、絶乾状態のセパレータの密度を測定した。
〔含浸速度〕
幅15mm厚さ100μmの陽極箔と幅15mm厚さ50μmの陰極箔とに幅18mmのセパレータを介在させて巻回して得た直径6mm高さ18mmの素子の底面を、1-エチル-2,3-ジメチル-4,5-ジヒドロイミダソリウム=水素=フタラートの25質量%γ-ブチロラクトン溶液に3mm浸し、LCRメーターを用いて、120Hz、20℃で測定した静電容量が、定格静電容量の90%以上になるまでの時間を測定した。
平均繊維長は、JIS P 8226-2『パルプ-光学的自動分析法による繊維長測定方法 第2部:非偏光法』(ISO16065-2『Pulps-Determination of Fibre length by automated optical analysis-Part2:Unpolarized light method』)に準じて、Kajaani Fiberlab Ver.4(Metso Automation社製)を用いて測定したContour length(中心線繊維長)の長さ荷重平均繊維長の値である。
作製したコンデンサのESRは、温度20℃、周波数100kHzの条件にてLCRメーターを用いて測定した。
〔静電容量〕
作製したコンデンサの静電容量は、温度20℃、周波数120Hzの条件にてLCRメーターを用いて測定した。
容量維持率は、ハイブリッド電解コンデンサについてのみ測定した。
ハイブリッド電解コンデンサを、遠心分離機を用いて遠心加速度1000Gで5分間遠心分離した後の静電容量を、遠心分離前の静電容量で除し、百分率でもとめた。
陽極箔と陰極箔とにセパレータを介在させて巻回し、再化成処理後、コンデンサ素子に導電性高分子分散体を含浸後乾燥させ、ケースに挿入、封口して、定格電圧50V、直径8.0mm、高さ10.0mmの固体電解コンデンサを作製した。
以下、本発明にかかる一発明の実施の形態における固体電解コンデンサ及びハイブリッド電解コンデンサの具体的な各種実施例、比較例、従来例について、詳細に説明する。
コットンリンターパルプ15質量%と、ジュートパルプ25質量%、ナイロン繊維35質量%を混合し円網抄紙し、実施例1のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は1.2mm、厚さは60μm、密度は0.55g/cm3、含浸速度は49秒であった。
マーセル化竹パルプ30質量%と、サイザル麻パルプ15質量%、ナイロン繊維55質量%を混合して円網抄紙し、実施例2のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は1.3mm、厚さは20μm、密度は0.40g/cm3、含浸速度は38秒であった。
コットンパルプ30質量%と、叩解溶剤紡糸レーヨン繊維30質量%、繊維長4mmの未叩解レーヨン繊維40質量%を混合して円網抄紙し、実施例3のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は2.4mm、厚さは90μm、密度は0.35g/cm3、含浸速度は12秒であった。
コットンパルプ10質量%と、ケナフパルプ10質量%、アクリル繊維80質量%を混合して円網抄紙し、実施例4のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は1.1mm、厚さは40μm、密度は0.22g/cm3、含浸速度は5秒であった。
コットンパルプ20質量%と、ポリエステル繊維40質量%、アクリル繊維40質量%を混合して円網抄紙し、参考例のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は1.4mm、厚さは40μm、密度は0.17g/cm3、含浸速度は2秒であった。
マニラ麻パルプ60質量%と、サイザル麻パルプ40質量%を混合して円網抄紙し、比較例のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は2.3mm、厚さは30μm、密度は0.65g/cm3、含浸速度は55秒であった。
特許文献2の実施例3を参考に、コットンパルプ5質量%と、フィブリル化アラミド繊維30質量%、ポリエステル繊維65質量%を混合して円網抄紙し、従来例1のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は0.4mm、厚さは45μm、密度は0.38g/cm3、含浸速度は61秒であった。
特許文献3の実施例7を参考に、コットンパルプ30質量%と、マニラ麻パルプ30質量%、フィブリル化アクリル繊維40質量%を混合して円網抄紙し、従来例2のセパレータを得た。
このセパレータのセルロース繊維の平均繊維長は2.1mm、厚さは35μm、密度は0.28g/cm3、含浸速度は54秒であった。
〔実施例1〕
実施例1のセパレータを用いた固体電解コンデンサは、静電容量48μF、ESR26mΩであった。実施例1のセパレータを用いたハイブリッド電解コンデンサは、静電容量40μF、容積維持率91%、ESR32mΩであった。
実施例2のセパレータを用いた固体電解コンデンサは、静電容量47μF、ESR26mΩであった。実施例2のセパレータを用いたハイブリッド電解コンデンサは、静電容量40μF、容積維持率93%、ESR33mΩであった。
実施例3のセパレータを用いた固体電解コンデンサは、静電容量45μF、ESR28mΩであった。実施例3のセパレータを用いたハイブリッド電解コンデンサは、静電容量37μF、容積維持率95%、ESR35mΩであった。
実施例4のセパレータを用いた固体電解コンデンサは、静電容量44μF、ESR29mΩであった。実施例4のセパレータを用いたハイブリッド電解コンデンサは、静電容量36μF、容積維持率96%、ESR36mΩであった。
参考例のセパレータを用いてコンデンサ素子を作製しようとしたが、強度が弱く、素子作製時にセパレータの破断が多発したため、固体電解コンデンサ及びハイブレッド電解コンデンサ共にコンデンサ素子を作製できなかった。
比較例のセパレータを用いた固体電解コンデンサは、静電容量38μF、ESR40mΩであった。比較例のセパレータを用いたハイブリッド電解コンデンサは、静電容量28μF、容積維持率80%、ESR45mΩであった。
従来例1のセパレータを用いた固体電解コンデンサは、静電容量40μF、ESR37mΩであった。従来例1のセパレータを用いたハイブリッド電解コンデンサは、静電容量29μF、容積維持率82%、ESR40mΩであった。
従来例2のセパレータを用いた固体電解コンデンサは、静電容量55μF、ESR33mΩであった。従来例2のセパレータを用いたハイブリッド電解コンデンサは、静電容量32μF、容積維持率86%、ESR32mΩであった。
各実施例、参考例、比較例、各従来例の比較から、セパレータの含浸速度を50秒以内とすることで、固体電解コンデンサ、及びハイブリッド電解コンデンサの静電容量とESRを改善し、ハイブリッド電解コンデンサの容量維持率も向上できる。
Claims (3)
- 一対の電極の間に介在するアルミニウム電解コンデンサ用セパレータであって、
前記一対の電極間に前記セパレータを介在させて巻回して得た素子の底面を電解液に浸した含浸速度が50秒以下であることを特徴とするアルミニウム電解コンデンサ用セパレータ。 - 一対の電極と、前記一対の電極の間にセパレータを介在させてなるアルミニウム電解コンデンサであって、
請求項1記載のセパレータを用いることを特徴とするアルミニウム電解コンデンサ。 - 前記一対の電極における陰極材料として導電性高分子を用いることを特徴とする請求項2記載のアルミニウム電解コンデンサ。
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KR1020217019443A KR20210105910A (ko) | 2018-12-27 | 2019-12-17 | 알루미늄 전해 콘덴서용 세퍼레이터 및 알루미늄 전해 콘덴서 |
EP19902134.6A EP3905289A4 (en) | 2018-12-27 | 2019-12-17 | SEPARATOR FOR ALUMINUM ELECTROLYTE CAPACITOR AND ALUMINUM ELECTROLYTE CAPACITOR |
BR112021012564-7A BR112021012564A2 (pt) | 2018-12-27 | 2019-12-17 | Separador para capacitor eletrolítico de alumínio, e, capacitor eletrolítico de alumínio |
US17/417,432 US20220230814A1 (en) | 2018-12-27 | 2019-12-17 | Separator for aluminum electrolytic capacitor and aluminum electrolytic capacitor |
CN201980085680.2A CN113228213B (zh) | 2018-12-27 | 2019-12-17 | 铝电解电容器用分隔件及铝电解电容器 |
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KR100722973B1 (ko) * | 2005-11-04 | 2007-05-30 | 삼화전기주식회사 | 전도성 고분자 전해질 조성물을 이용한 고체 전해콘덴서의제조방법 |
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JP6442097B1 (ja) * | 2018-03-29 | 2018-12-19 | ニッポン高度紙工業株式会社 | アルミニウム電解コンデンサ用セパレータおよび該セパレータを用いたアルミニウム電解コンデンサ |
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- 2019-12-17 BR BR112021012564-7A patent/BR112021012564A2/pt not_active Application Discontinuation
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- 2019-12-17 TW TW108146111A patent/TWI828822B/zh active
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- 2019-12-17 KR KR1020217019443A patent/KR20210105910A/ko not_active Application Discontinuation
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EP3905289A1 (en) | 2021-11-03 |
US20220230814A1 (en) | 2022-07-21 |
JP2020107769A (ja) | 2020-07-09 |
KR20210105910A (ko) | 2021-08-27 |
CN113228213B (zh) | 2023-05-02 |
CN113228213A (zh) | 2021-08-06 |
TW202032594A (zh) | 2020-09-01 |
JP6827458B2 (ja) | 2021-02-10 |
BR112021012564A2 (pt) | 2021-09-14 |
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