WO2022071223A1 - 電解コンデンサおよびその製造方法 - Google Patents
電解コンデンサおよびその製造方法 Download PDFInfo
- Publication number
- WO2022071223A1 WO2022071223A1 PCT/JP2021/035384 JP2021035384W WO2022071223A1 WO 2022071223 A1 WO2022071223 A1 WO 2022071223A1 JP 2021035384 W JP2021035384 W JP 2021035384W WO 2022071223 A1 WO2022071223 A1 WO 2022071223A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- separator
- electrolytic capacitor
- metal oxide
- acid
- electrolyte
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
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
- H01G9/02—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
- H01G9/025—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
- H01G9/022—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
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
-
- 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
-
- 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
-
- 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
-
- 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
Definitions
- This disclosure relates to electrolytic capacitors and their manufacturing methods.
- Electrolytic capacitors are used in various fields. In recent years, electrolytic capacitors have been required to have high reliability, and in particular, to have little deterioration at high temperatures.
- Patent Document 1 International Publication No. 2015/033566 describes the anode including the anode, the cathode facing the anode, the separator base material, and the conductive polymer adhered to the separator base material.
- the first surface layer has a first region not covered with the conductive polymer
- the second surface layer has the second surface layer including the second surface facing the cathode body.
- a power storage device having a second region covered with a conductive polymer.
- Patent Document 2 Japanese Unexamined Patent Publication No. 2007-149733 states that "in a wound electrolytic capacitor made of an anode foil, a separator, and a cathode material, a separator having a conductive thin film formed on one side is used as the cathode material.
- Patent Document 2 states, "In the present invention, by forming a conductive thin film on one side of the separator, the present invention functions as a separator and a cathode, so that the conventional cathode foil can be unnecessary, and the anode foil, the separator, and the like can be used.
- the cathode foil and the separator can be configured as the anode foil, the separator, and the single-sided conductive separator, and the thickness per winding can be reduced. Therefore, the size is smaller than that of the conventional wound electrolytic capacitor. It is possible to plan.
- one of the objects of the present disclosure is to provide an electrolytic capacitor whose characteristics are not deteriorated even at a high temperature.
- the electrolytic capacitor includes an anode, a dielectric layer formed on the anode, a cathode, a separator and an electrolyte disposed between the dielectric layer and the cathode, and the separator. At least a part of the above is coated with a conductive metal oxide.
- the manufacturing method is a method for manufacturing an electrolytic capacitor including an anode, a dielectric layer formed on the anode, a cathode body, a separator, and an electrolyte, and is between the dielectric layer and the cathode body.
- the step (i) of forming a condenser element by arranging the anode, the cathode, the separator, and the electrolyte so that the separator and the electrolyte are arranged is included, and at least a part of the separator is included. It is coated with a conductive metal oxide.
- the electrolytic capacitor according to the present embodiment includes an anode body, a dielectric layer formed on the anode body, a cathode body, and a separator and an electrolyte arranged between the dielectric layer and the cathode body. At least part of the separator is coated with a conductive metal oxide.
- the metal oxide may be referred to as "metal oxide (M)" below.
- an electrolytic capacitor with less deterioration at high temperature can be obtained by using a separator coated with a metal oxide (M).
- M metal oxide
- the strength and heat resistance of the separator can be increased. Therefore, according to the electrolytic capacitor of the present disclosure, it is possible to prevent the electrode plate spacing between the anode body and the cathode body from becoming narrow due to deterioration of the separator due to heat. As a result, it is possible to suppress deterioration of characteristics due to heat (decrease in withstand voltage, increase in leakage current, etc.).
- the metal oxide (M) may be attached to the separator in a particulate state or may be attached to the separator in a layered state.
- the metal oxide (M) contains an oxide of at least one element selected from the group consisting of indium, tin, antimony, and zinc.
- the metal oxide (M) include indium tin oxide (ITO), zinc oxide (ZnO), antimony-doped tin oxide (ATO) and the like.
- the separator may contain synthetic fibers or may be made of synthetic fibers. Synthetic fibers are preferable because they have high heat resistance. In addition, synthetic fibers are preferable because they have high resistance in the step of forming the metal oxide (M). Examples of synthetic fiber materials include polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, vinylon, nylon, aromatic polyamide (aramid), polyimide, polyamideimide, polyetherimide and the like. Among these, aromatic polyamides and nylons are preferable because they have high heat resistance. Alternatively, the separator may contain natural fibers or may be made of natural fibers. Examples of natural fiber materials include cellulose and the like.
- the air permeability (air permeability resistance) of the separator may be in the range of 1.0 to 200 seconds / 100 mL (for example, the range of 1.5 to 100 seconds / 100 mL). Within this range, the metal oxide (M) can be uniformly formed on the fiber surface inside the separator, and the conductivity inside the separator can be enhanced.
- the air permeability can be measured by, for example, a B-type tester (Garley densometer) in accordance with the section of "21.2 Air permeability B method (Garley test method)" defined in JIS C2300. ..
- the density of the separator may be substantially the same for the entire separator, or may differ depending on the location of the separator.
- the density of the part of the separator on the anode side and the density of the part of the separator on the cathode side may be different.
- the density of the anode-side portion of the separator is higher than the density of the cathode-side portion of the separator.
- the density of the anode-side portion of the separator is lower than the density of the cathode-side portion of the separator.
- high density can be replaced by low porosity, and low density can be replaced by high porosity. The lower the density, the easier it is for the metal oxide (M) to permeate the inside of the separator when the metal oxide (M) is formed.
- Separators having different densities depending on the location may be formed by a known method or commercially available ones may be used.
- the electrolyte may contain an electrolytic solution and a conductive polymer.
- the conductive polymer can further reduce the electrical resistance between the anode body and the cathode body. Examples of the electrolytic solution and the conductive polymer will be described later.
- the electrolyte does not contain a conductive polymer and may be composed of an electrolytic solution.
- a separator coated with a conductive metal oxide (M) is used. Therefore, according to the electrolytic capacitor according to the present disclosure, it is possible to achieve good characteristics (for example, low ESR) without a conductive polymer.
- a conductive polymer it is usually necessary to use an electrolytic solution in which dedoping does not easily occur in order to avoid dedoping from the conductive polymer.
- the conductive polymer is not used, there are less restrictions on the electrolytic solution. For example, when a conductive polymer is not used, it becomes easy to use an electrolytic solution having a pH close to neutral or an electrolytic solution having a high concentration of an electrolyte salt.
- the electrolyte is composed of an electrolytic solution that does not contain a conductive polymer
- a separator high-density separator
- the metal oxide (M) can be formed more uniformly on the fiber surface inside the separator, and the conductivity inside the separator can be enhanced.
- the porosity of a separator having a low porosity may be in the range of 20% to 80% (for example, in the range of 40% to 70%).
- the cathode body preferably contains a metal foil.
- An example of the metal leaf will be described later.
- the metal foil By including the metal foil in the cathode body, it is possible to reduce the ESR and increase the capacity.
- the contact resistance between the separator and the cathode body since at least a part of the separator is coated with the metal oxide (M), the contact resistance between the separator and the cathode body (from another viewpoint, the contact resistance between the electrolyte and the cathode body) is particularly high. Can be reduced.
- a conductive layer containing at least one element selected from the group consisting of carbon, titanium, and nickel may be formed on the separator side of the surface of the cathode body. According to this configuration, the adhesion between the separator and the cathode body can be improved, and the contact resistance between the two can be particularly reduced. As a result, it is possible to reduce ESR.
- These conductive layers may be formed by using a paste containing particles of these materials (for example, graphite particles or metal particles), or may be formed by a dry process (vapor deposition, sputtering, etc.).
- the amount of the metal oxide (M) that covers the portion of the separator on the cathode body side may be larger than the amount of the metal oxide (M) that covers the portion of the separator on the anode body side. According to this configuration, the contact resistance between the separator and the cathode body can be particularly reduced.
- the amount of the metal oxide (M) covering the separator may be substantially uniform in the thickness direction of the separator, or may be substantially uniform over the entire separator. By coating the entire separator with the metal oxide (M), ESR and the like can be particularly reduced.
- a metal foil having a dielectric layer formed on the surface thereof may be used as the anode body.
- the type of metal constituting the metal foil is not particularly limited.
- metals constituting the metal leaf include alloys of valvular metals such as aluminum, tantalum, niobium, titanium, and valvular metals because of the ease of formation of the dielectric layer. ..
- a preferred example is aluminum and aluminum alloys.
- the surface of the anode is roughened (porous). In that case, a dielectric layer is formed on at least a part of the surface (roughened surface) of the porous portion. The electrolyte is in contact with the dielectric layer.
- a metal foil may be used for the cathode body.
- the type of metal constituting the metal foil is not particularly limited.
- the metals constituting the metal leaf include a metal having a valve action, such as aluminum, tantalum, niobium, and titanium, and an alloy of the metal having a valve action.
- a preferred example is aluminum and aluminum alloys.
- the surface of the cathode body may be provided with a chemical conversion film, or may be provided with a metal (dissimilar metal) or non-metal film different from the metal constituting the cathode body.
- the dissimilar metal and the non-metal include a metal such as titanium and a non-metal such as carbon.
- separator As the separator, a sheet-like material that can be impregnated with an electrolyte can be used, and for example, a sheet-like material that has insulating properties and can be impregnated with an electrolyte may be used.
- the separator may be a woven fabric, a non-woven fabric, or a porous membrane. In any case, the separator has voids. Examples of separator materials include cellulose, polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, vinylon, nylon, aromatic polyamide, polyimide, polyamideimide, polyetherimide, rayon, and glass.
- the electrolyte of the electrolytic capacitors of the present disclosure typically comprises a non-aqueous solvent.
- the electrolyte may contain an electrolytic solution (non-aqueous electrolytic solution) containing a non-aqueous solvent and a basic component dissolved in the non-aqueous solvent, or may be composed of the electrolytic solution. That is, the electrolyte of the electrolytic capacitor of the present disclosure may contain a liquid component.
- the liquid component (non-aqueous solvent or electrolytic solution) contained in the electrolyte may be referred to as “liquid component (L)”.
- the liquid component (L) may be a component that is liquid at room temperature (25 ° C.) or may be a component that is liquid at the temperature at which the electrolytic capacitor is used. ..
- the non-aqueous solvent contained in the electrolyte may be an organic solvent or an ionic liquid.
- non-aqueous solvents include polyhydric alcohols such as ethylene glycol and propylene glycol, cyclic sulfones such as sulfolane (SL), lactones such as ⁇ -butyrolactone ( ⁇ BL), N-methylacetamide, N, N-. Includes dimethylformamides, amides such as N-methyl-2-pyrrolidone, esters such as methyl acetate, carbonate compounds such as propylene carbonate, ethers such as 1,4-dioxane, ketones such as methylethylketone, and formaldehyde. ..
- a polymer solvent may be used as the non-aqueous solvent.
- the polymer solvent include polyalkylene glycols, derivatives of polyalkylene glycols, compounds in which at least one hydroxyl group in a polyhydric alcohol is replaced with polyalkylene glycol (including a derivative), and the like.
- examples of polymer solvents include polyethylene glycol (PEG), polyethylene glycol glyceryl ether, polyethylene glycol diglyceryl ether, polyethylene glycol sorbitol ether, polypropylene glycol, polypropylene glycol glyceryl ether, polypropylene glycol diglyceryl ether, and the like.
- Polyethylene glycol sorbitol ether, polybutylene glycol and the like are included.
- the polymer solvent further include a copolymer of ethylene glycol-propylene glycol, a copolymer of ethylene glycol-butylene glycol, a copolymer of propylene glycol-butylene glycol and the like.
- the non-aqueous solvent one type may be used alone, or two or more types may be mixed and used.
- the electrolyte may contain a non-aqueous solvent and a base component (base) dissolved in the non-aqueous solvent. Further, the electrolyte may contain a non-aqueous solvent and a base component and / or an acid component (acid) dissolved in the non-aqueous solvent.
- polycarboxylic acid and monocarboxylic acid can be used as the acid component.
- polycarboxylic acids include aliphatic polycarboxylic acids ([saturated polycarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebatic acid, 1).
- 6-Decandicarboxylic acid 5,6-decandicarboxylic acid]; [unsaturated polycarboxylic acid, eg maleic acid, fumaric acid, icotanic acid]), aromatic polycarboxylic acid (eg, phthalic acid, isophthalic acid, terephthalic acid) , Trimellitic acid, pyromellitic acid), alicyclic polycarboxylic acid (for example, cyclohexane-1,2-dicarboxylic acid, cyclohexene-1,2-dicarboxylic acid, etc.).
- aromatic polycarboxylic acid eg, phthalic acid, isophthalic acid, terephthalic acid
- Trimellitic acid pyromellitic acid
- alicyclic polycarboxylic acid for example, cyclohexane-1,2-dicarboxylic acid, cyclohexene-1,2-dicarboxylic acid, etc.
- Examples of the monocarboxylic acid are aliphatic monocarboxylic acids (1 to 30 carbon atoms) ([saturated monocarboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, etc. Caprilic acid, pelargonic acid, lauric acid, myristic acid, stearic acid, behenic acid]; Acids, naphthoic acids), oxycarboxylic acids (eg salicylic acid, mandelic acid, resorcinic acid).
- saturated monocarboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, etc.
- maleic acid, phthalic acid, benzoic acid, pyromellitic acid, and resorcinic acid are thermally stable and are preferably used.
- Inorganic acid and / or organic acid may be used as the acid component.
- typical inorganic acids include phosphoric acid, phosphite, hypophosphoric acid, boric acid, borofluoric acid, boric acid tetrafluoride, and phosphoric acid hexafluoride.
- Examples of typical organic acids include alkane sulfonic acid such as methane sulfonic acid, alkanol sulfonic acid such as phenol sulfonic acid and cresol sulfonic acid, benzene sulfonic acid, naphthalene sulfonic acid, alkyl phosphoric acid ester, benzene sulfonic acid and naphthalene sulfonic acid.
- alkane sulfonic acid such as methane sulfonic acid
- alkanol sulfonic acid such as phenol sulfonic acid and cresol sulfonic acid
- benzene sulfonic acid naphthalene sulfonic acid
- alkyl phosphoric acid ester alkyl phosphoric acid ester
- benzene sulfonic acid and naphthalene sulfonic acid can be mentioned.
- the basic component may be a compound having an alkyl-substituted amidine group, and may be, for example, an imidazole compound, a benzoimidazole compound, an alicyclic amidine compound (pyrimidine compound, an imidazoline compound) or the like.
- a quaternary salt of a compound having an alkyl-substituted amidine group may be used.
- examples of such a base component include an imidazole compound, a benzimidazole compound, and an alicyclic amidine compound (pyrimidine compound, imidazoline compound) quaternized with an alkyl group having 1 to 11 carbon atoms or an arylalkyl group. Will be.
- a tertiary amine may be used as a base component.
- tertiary amines include trialkylamines (trimethylamine, dimethylethylamine, methyldiethylamine, triethylamine, dimethyl-n-propylamine, dimethylisopropylamine, methylethyln-propylamine, methylethylisopropylamine, diethyl-n- Propylamine, diethylisopropylamine, tri-n-propylamine, triisopropylamine, tri-n-butylamine, tri-tert-butylamine, etc.), phenyl group-containing amines (dimethylphenylamine, methylethylphenylamine, diethylphenylamine, etc.) ).
- trialkylamines are preferable from the viewpoint of increasing the conductivity of the electrolyte, and it is more preferable to contain at least one selected from the group consisting of trimethylamine, dimethylethylamine, methyldiethylamine and triethylamine.
- a secondary amine such as dialkylamines, a primary amine such as monoalkylamine, or ammonia may be used.
- the liquid component (L) may contain a salt of an acid component and a base component.
- the salt may be an inorganic salt and / or an organic salt.
- An organic salt is a salt in which at least one of an anion and a cation contains an organic substance. Examples of the organic salt include trimethylamine maleate, triethylamine borodisalicylate, ethyldimethylamine phthalate, mono1,2,3,4-tetramethylimidazolinium phthalate, and mono 1,3-dimethyl-2-phthalate. Ethylimidazolinium or the like may be used.
- the amount of the base component in the electrolytic solution may be 0.1% by mass or more and 20% by mass or less.
- the amount of the base component is 0.1% by mass or more, it is particularly important to use conductive particles. Further, by setting the amount of the base component to 20% by mass or less, it becomes easy to dissolve the base component in the electrolytic solution.
- a low ESR can be achieved by using an electrolyte containing a conductive polymer doped with a dopant.
- an electrolyte containing a dopant-doped conductive polymer and the liquid component (L) is used, the initial ESR is low, but the ESR may increase over time. From the viewpoint of suppressing such an increase in ESR, an electrolyte containing no conductive polymer may be used. Alternatively, an electrolytic solution in which dedopant is less likely to occur may be used. To realize these, it is preferable to use a separator coated with a metal oxide (M).
- the electrolyte may contain a conductive polymer in addition to the liquid component (L) (for example, an electrolytic solution).
- conductive polymers include polypyrrole, polythiophene, polyfuran, polyaniline, polyacetylene, and derivatives thereof.
- the derivatives include polymers based on polypyrrole, polythiophene, polyfuran, polyaniline, and polyacetylene.
- the derivative of polythiophene includes poly (3,4-ethylenedioxythiophene) and the like.
- These conductive polymers may be used alone or in combination of two or more.
- the conductive polymer may be a copolymer of two or more kinds of monomers.
- the weight average molecular weight of the conductive polymer is not particularly limited, and may be in the range of, for example, 1000 to 100,000.
- a preferred example of the conductive polymer is poly (3,4-ethylenedioxythiophene) (PEDOT).
- the conductive polymer may be doped with a dopant. From the viewpoint of suppressing dedoping from the conductive polymer, it is preferable to use a polymer dopant as the dopant.
- a polymer dopant examples include polyvinyl sulfonic acid, polystyrene sulfonic acid, polyallyl sulfonic acid, polyacrylic sulfonic acid, polymethacrylic sulfonic acid, poly (2-acrylamide-2-methylpropanesulfonic acid), polyisoprene sulfonic acid, Includes polyacrylic acid and the like. These may be used alone or in combination of two or more. These may be contained in the electrolyte in the form of salts.
- a preferred example of the dopant is polystyrene sulfonic acid (PSS).
- the dopant may be a dopant containing an acidic group or a polymer dopant containing an acidic group.
- acidic groups include sulfonic acid groups, carboxyl groups and the like.
- the polymer dopant containing an acidic group is a polymer (polymer) in which at least a part of the constituent units contains an acidic group. Examples of such polymeric dopants include the polymeric dopants described above.
- the weight average molecular weight of the dopant is not particularly limited. From the viewpoint of facilitating the formation of a homogeneous electrolyte, the weight average molecular weight of the dopant may be in the range of 1000 to 100,000.
- the dopant may be polystyrene sulfonic acid
- the conductive polymer may be poly (3,4-ethylenedioxythiophene). That is, the electrolyte may contain polystyrene sulfonic acid-doped poly (3,4-ethylenedioxythiophene).
- the pH of the liquid component (L) may be set to less than 7 or 5 or less (for example, in the range of 2 to 4.5) in order to suppress the dedoping of the dopant. May be good.
- the method of the present disclosure for manufacturing an electrolytic capacitor will be described below. According to this manufacturing method, the electrolytic capacitor according to the present disclosure can be manufactured. Since the matters described about the electrolytic capacitor according to the present disclosure can be applied to the following manufacturing method, duplicate description may be omitted. For example, since the components of the capacitor element and the like have been described above, overlapping description may be omitted. Further, the matters described in the following manufacturing method can be applied to the above-mentioned electrolytic capacitor.
- the manufacturing method according to the present disclosure is a manufacturing method of an electrolytic capacitor including an anode, a dielectric layer formed on the anode, a cathode body, a separator, and an electrolyte.
- This manufacturing method includes a step (i) of forming a capacitor element by arranging an anode, a cathode, a separator, and an electrolyte so that a separator and an electrolyte are arranged between the dielectric layer and the cathode. ..
- a conductive metal oxide (M) As described above, at least a part of the separator is coated with a conductive metal oxide (M).
- the step (i) is not particularly limited, and a known method may be applied.
- An example of the step (i) is a step (ia) of arranging the anode, the cathode body, and the separator so that the separator is arranged between the dielectric layer and the cathode body, and an electrolyte in the separator. It may include the step (i-b) of impregnation. In step (i-b), the electrolyte is placed between the dielectric layer and the cathode body.
- the foil-shaped anode body, the foil-shaped cathode body, and the separator are laminated so that the separator is arranged between the anode body and the cathode body on which the dielectric layer is formed. Or it is done by winding. That is, the capacitor element may be a laminated type or a wound type.
- the step (i-b) may be performed by immersing the structure (laminated body, wound body, etc.) formed in the step (ia) in an electrolyte (for example, an electrolytic solution).
- an electrolyte for example, an electrolytic solution.
- the structure formed in step (ia) is added to the dispersion liquid in which the conductive polymer (and the dopant if necessary) is dispersed.
- the step (ib) may be performed by immersing.
- the dispersion medium of the dispersion liquid is not particularly limited, and a known dispersion medium may be used.
- an aqueous liquid containing water may be used, or water may be used.
- the dipping step (impregnation step of step (i-b)) may be performed only once or may be performed a plurality of times.
- a heat treatment step may be performed after the dipping step.
- the step of impregnating the separator with the liquid component (L) may be performed.
- the impregnation method is not particularly limited, and a known method may be used.
- a structure (laminated body, wound body, etc.) on which a conductive polymer is arranged may be immersed in a non-aqueous solvent (or electrolytic solution).
- the manufacturing method according to the present disclosure may include the step (a) and the step (b) in this order before the step (i).
- the step (a) is a step of coating at least a part of the sheet to be a separator by cutting with the metal oxide (M).
- Step (b) is a step of forming a separator by cutting a sheet.
- the step (a) is not particularly limited, and a known method may be used.
- a dry process sputtering method, vapor deposition method, etc.
- a wet process process using a treatment liquid
- those methods may be used.
- the amount of the metal oxide (M) adhering to one surface of the separator is determined by the amount of the metal oxide adhering to the other surface of the separator (M). It is easy to make more than the amount of M).
- Examples of the wet process include a gravure method, a slot die method, a bank coating method, an inkjet method, and a dipping method.
- a wet process it is possible to coat the entire separator with the metal oxide (M).
- the entire separator is coated with the metal oxide (M) in a substantially uniform coverage.
- the metal oxide (M) can be unevenly distributed even in a wet process.
- the production method according to the present disclosure may include a step of crystallizing the metal oxide (M) after the step (a) (for example, between the step (a) and the step (b)).
- a step of crystallizing the metal oxide (M) for example, indium tin oxide
- crystallization can be performed, for example, by heat-treating the sheet coated with the metal oxide (M) by the step (a).
- the heat treatment conditions are selected according to the type of metal oxide (M). For example, when the metal oxide (M) is indium tin oxide, the heat treatment may be performed at a temperature in the range of 150 to 300 ° C. for 1 to 60 minutes.
- the sheet may be coated with the metal oxide (M) between the roll for feeding the sheet and the roll for winding the sheet.
- the metal oxide (M) can be efficiently adhered to the sheet.
- a so-called role-to-role method can be applied to this method.
- the coating with the metal oxide (M) may be performed by a dry process or a wet process. In the dry process, coating with metal oxide (M) is usually performed in the decompression chamber. In that case, a roll for feeding the sheet and a roll for winding the sheet may be arranged in the decompression chamber.
- the capacitor element formed in step (i) is connected to leads, sealed with a sealing resin, and sealed in a case as necessary. In this way, the electrolytic capacitor is manufactured.
- the electrolytic capacitor of the present disclosure is not limited to the following figures.
- the above-mentioned components can be applied to the components of the electrolytic capacitor of the example described below. Further, the components of the electrolytic capacitor of the example described below can be changed based on the above description. Further, the matters described below may be applied to the above-described embodiment.
- FIG. 1 schematically shows a cross section of an example of the electrolytic capacitor 100 of the first embodiment.
- FIG. 2 shows a schematic view of a part of the capacitor element 10 included in the electrolytic capacitor 100 shown in FIG. 1 in an expanded manner.
- the electrolytic capacitor 100 includes a capacitor element 10, a bottomed case 11 that houses the capacitor element 10, a sealing member 12 that closes the opening of the bottomed case 11, and a seat that covers the sealing member 12. It includes a plate 13, lead wires 14A and 14B derived from the sealing member 12 and penetrating the seat plate 13, and lead tabs 15A and 15B connecting the lead wires 14A and 14B and the electrodes of the capacitor element 10.
- the capacitor element 10 is housed in the bottomed case 11. The vicinity of the open end of the bottomed case 11 is drawn inward, and the open end of the bottomed case 11 is curled so as to crimp the sealing member 12.
- the capacitor element 10 has a foil-shaped anode body 21 having a dielectric layer (not shown) formed on its surface, a foil-shaped cathode body 22, and a separator arranged between them. 23 and an electrolyte (not shown).
- the anode body 21 and the cathode body 22 are wound with a separator 23 arranged between them.
- the outermost circumference of the winding body is fixed by the winding stop tape 24.
- FIG. 2 shows a partially unfolded state before fixing the outermost circumference of the winding body.
- at least a part of the separator 23 is coated with the metal oxide (M).
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
本発明の新規な特徴を添付の請求の範囲に記述するが、本発明は、構成および内容の両方に関し、本発明の他の目的および特徴と併せ、図面を照合した以下の詳細な説明によりさらによく理解されるであろう。
本実施形態に係る電解コンデンサは、陽極体と、陽極体上に形成された誘電体層と、陰極体と、誘電体層と陰極体との間に配されたセパレータおよび電解質とを含む。セパレータの少なくとも一部は、導電性を有する金属酸化物で被覆されている。当該金属酸化物を、以下では「金属酸化物(M)」と称する場合がある。
陽極体には、表面に誘電体層が形成された金属箔を用いてもよい。金属箔を構成する金属の種類は特に限定されない。誘電体層の形成が容易である点から、金属箔を構成する金属の例には、アルミニウム、タンタル、ニオブ、チタンなどの、弁作用を有する金属、および弁作用を有する金属の合金が含まれる。好ましい一例は、アルミニウムおよびアルミニウム合金である。通常、陽極体の表面は粗面化(多孔質化)されている。その場合、多孔質部分の表面(粗面化された表面)の少なくとも一部には誘電体層が形成される。電解質は、誘電体層と接触している。
陰極体には、金属箔を用いてもよい。金属箔を構成する金属の種類は特に限定されない。金属箔を構成する金属の例には、アルミニウム、タンタル、ニオブ、チタンなどの、弁作用を有する金属、および弁作用を有する金属の合金が含まれる。好ましい一例は、アルミニウムおよびアルミニウム合金である。陰極体の表面には、化成皮膜が設けられていてもよく、陰極体を構成する金属とは異なる金属(異種金属)や非金属の被膜が設けられていてもよい。異種金属や非金属としては、例えば、チタンのような金属やカーボンのような非金属などを挙げることができる。
セパレータには、電解質が含浸されうるシート状物を用いることができ、例えば、絶縁性を有し且つ電解質が含浸されうるシート状物を用いてもよい。セパレータは、織布であってもよいし、不織布であってもよいし、多孔質膜であってもよい。いずれにしてもセパレータは、空隙を有する。セパレータの材料の例には、セルロース、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリフェニレンサルファイド、ビニロン、ナイロン、芳香族ポリアミド、ポリイミド、ポリアミドイミド、ポリエーテルイミド、レーヨン、およびガラスなどが含まれる。
本開示の電解コンデンサの電解質は、典型的には、非水溶媒を含む。電解質は、非水溶媒と非水溶媒に溶解された塩基成分とを含む電解液(非水電解液)を含んでもよく、当該電解液によって構成されていてもよい。すなわち、本開示の電解コンデンサの電解質は、液状成分を含んでもよい。以下では、電解質に含まれる液状成分(非水溶媒または電解液)を、「液状成分(L)」と称する場合がある。なお、この明細書において、液状成分(L)は、室温(25℃)において液体状である成分であってもよいし、電解コンデンサの使用時の温度において液体状である成分であってもよい。
電解コンデンサを製造するための本開示の方法について、以下に説明する。この製造方法によれば、本開示に係る電解コンデンサを製造できる。なお、本開示に係る電解コンデンサについて説明した事項は以下の製造方法に適用できるため、重複する説明を省略する場合がある。例えば、コンデンサ素子の構成要素などについては上述したため、重複する説明を省略する場合がある。また、以下の製造方法で説明する事項は、上述した電解コンデンサに適用できる。
実施形態1では、本開示に係る電解コンデンサの一例について説明する。この電解コンデンサは、第1のコンデンサ素子を含む電解コンデンサである。図1は、実施形態1の電解コンデンサ100の一例の断面を模式的に示す。図2は、図1に示した電解コンデンサ100に含まれるコンデンサ素子10の一部を展開した概略図を示す。
本発明を現時点での好ましい実施態様に関して説明したが、そのような開示を限定的に解釈してはならない。種々の変形および改変は、上記開示を読むことによって本発明に属する技術分野における当業者には間違いなく明らかになるであろう。したがって、添付の請求の範囲は、本発明の真の精神および範囲から逸脱することなく、すべての変形および改変を包含する、と解釈されるべきものである。
21 陽極体
22 陰極体
23 セパレータ
100 電解コンデンサ
Claims (11)
- 陽極体と、
前記陽極体上に形成された誘電体層と、
陰極体と、
前記誘電体層と前記陰極体との間に配されたセパレータおよび電解質とを含み、
前記セパレータの少なくとも一部は、導電性を有する金属酸化物で被覆されている、電解コンデンサ。 - 前記金属酸化物は、インジウム、スズ、アンチモン、および亜鉛からなる群より選択される少なくとも1つの元素の酸化物を含む、請求項1に記載の電解コンデンサ。
- 前記セパレータは合成繊維を含む、請求項1または2に記載の電解コンデンサ。
- 前記電解質は、電解液と導電性高分子とを含む、請求項1~3のいずれか1項に記載の電解コンデンサ。
- 前記陰極体は金属箔を含む、請求項1~4のいずれか1項に記載の電解コンデンサ。
- 前記陰極体の表面のうち、前記セパレータ側には、カーボン、チタン、およびニッケルからなる群より選択される少なくとも1つの元素を含む導電層が形成されている、請求項1~5のいずれか1項に記載の電解コンデンサ。
- 前記セパレータのうち前記陰極体側の部分を被覆する前記金属酸化物の量は、前記セパレータのうち前記陽極体側の部分を被覆する前記金属酸化物の量よりも多い、請求項1~6のいずれか1項に記載の電解コンデンサ。
- 陽極体、前記陽極体上に形成された誘電体層、陰極体、セパレータ、および電解質を含む電解コンデンサの製造方法であって、
前記誘電体層と前記陰極体との間に前記セパレータおよび前記電解質が配置されるように前記陽極体、前記陰極体、前記セパレータ、および前記電解質を配置することによってコンデンサ素子を形成する工程(i)を含み、
前記セパレータの少なくとも一部は、導電性を有する金属酸化物で被覆されている、電解コンデンサの製造方法。 - 前記工程(i)の前に、
切断によって前記セパレータとなるシートの少なくとも一部を前記金属酸化物で被覆する工程(a)と、
前記シートを切断することによって前記セパレータを形成する工程(b)とを含む、請求項8に記載の製造方法。 - 前記工程(a)の後に、前記金属酸化物を結晶化させる工程を含む、請求項9に記載の製造方法。
- 前記工程(a)において、
前記シートを送り出すロールと前記シートを巻き取るロールとの間で前記シートの少なくとも一部が前記金属酸化物で被覆される、請求項9または10に記載の製造方法。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202180066425.0A CN116235268A (zh) | 2020-09-29 | 2021-09-27 | 电解电容器及其制造方法 |
| JP2022553952A JP7796336B2 (ja) | 2020-09-29 | 2021-09-27 | 電解コンデンサおよびその製造方法 |
| US18/247,068 US12293878B2 (en) | 2020-09-29 | 2021-09-27 | Electrolytic capacitor and production method therefor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-163505 | 2020-09-29 | ||
| JP2020163505 | 2020-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022071223A1 true WO2022071223A1 (ja) | 2022-04-07 |
Family
ID=80951643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2021/035384 Ceased WO2022071223A1 (ja) | 2020-09-29 | 2021-09-27 | 電解コンデンサおよびその製造方法 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12293878B2 (ja) |
| JP (1) | JP7796336B2 (ja) |
| CN (1) | CN116235268A (ja) |
| WO (1) | WO2022071223A1 (ja) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005294505A (ja) * | 2004-03-31 | 2005-10-20 | Nippon Chemicon Corp | 固体電解コンデンサの製造方法 |
| WO2015033566A1 (ja) * | 2013-09-09 | 2015-03-12 | パナソニックIpマネジメント株式会社 | 蓄電デバイスおよびその製造方法およびセパレータ |
| JP2017027950A (ja) * | 2016-09-23 | 2017-02-02 | 株式会社Gsユアサ | 蓄電素子 |
| JP2017168696A (ja) * | 2016-03-17 | 2017-09-21 | 三菱製紙株式会社 | 固体電解コンデンサ用セパレータ及びそれを用いてなる固体電解コンデンサ |
| JP2019192436A (ja) * | 2018-04-23 | 2019-10-31 | トヨタ自動車株式会社 | 燃料電池セパレータ |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61156716A (ja) * | 1984-12-27 | 1986-07-16 | 日本ケミコン株式会社 | 電解コンデンサ |
| JP3440473B2 (ja) * | 1992-04-21 | 2003-08-25 | 松下電器産業株式会社 | 積層型電解コンデンサ及びその製造法 |
| JP3443927B2 (ja) * | 1994-04-14 | 2003-09-08 | 松下電器産業株式会社 | 電解コンデンサ及びその製造方法 |
| US6967828B2 (en) * | 2003-05-30 | 2005-11-22 | Medtronic, Inc. | Capacitors including metalized separators |
| JP2007149733A (ja) | 2005-11-24 | 2007-06-14 | Nichicon Corp | 電解コンデンサ |
| KR101766738B1 (ko) * | 2011-02-18 | 2017-08-09 | 스미토모덴키고교가부시키가이샤 | 3차원 그물 형상 알루미늄 다공체를 이용한 집전체 및 당해 집전체를 이용한 전극, 당해 전극을 이용한 비수 전해질 전지, 비수 전해액을 이용한 커패시터 및 리튬 이온 커패시터, 그리고 전극의 제조 방법 |
| WO2016103616A1 (ja) * | 2014-12-25 | 2016-06-30 | パナソニックIpマネジメント株式会社 | 電解コンデンサの製造方法 |
| WO2016174806A1 (ja) * | 2015-04-28 | 2016-11-03 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
| CN108292566B (zh) * | 2015-11-27 | 2020-05-01 | 松下知识产权经营株式会社 | 电解电容器及其制造方法 |
| CN110621731B (zh) * | 2017-05-26 | 2022-04-08 | 旭化成株式会社 | 聚烯烃微多孔膜、蓄电装置用分隔件及蓄电装置 |
| US11664558B2 (en) * | 2017-10-30 | 2023-05-30 | Arkema Inc. | Lithium ion battery separator |
-
2021
- 2021-09-27 WO PCT/JP2021/035384 patent/WO2022071223A1/ja not_active Ceased
- 2021-09-27 CN CN202180066425.0A patent/CN116235268A/zh active Pending
- 2021-09-27 US US18/247,068 patent/US12293878B2/en active Active
- 2021-09-27 JP JP2022553952A patent/JP7796336B2/ja active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005294505A (ja) * | 2004-03-31 | 2005-10-20 | Nippon Chemicon Corp | 固体電解コンデンサの製造方法 |
| WO2015033566A1 (ja) * | 2013-09-09 | 2015-03-12 | パナソニックIpマネジメント株式会社 | 蓄電デバイスおよびその製造方法およびセパレータ |
| JP2017168696A (ja) * | 2016-03-17 | 2017-09-21 | 三菱製紙株式会社 | 固体電解コンデンサ用セパレータ及びそれを用いてなる固体電解コンデンサ |
| JP2017027950A (ja) * | 2016-09-23 | 2017-02-02 | 株式会社Gsユアサ | 蓄電素子 |
| JP2019192436A (ja) * | 2018-04-23 | 2019-10-31 | トヨタ自動車株式会社 | 燃料電池セパレータ |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7796336B2 (ja) | 2026-01-09 |
| US20230411085A1 (en) | 2023-12-21 |
| JPWO2022071223A1 (ja) | 2022-04-07 |
| CN116235268A (zh) | 2023-06-06 |
| US12293878B2 (en) | 2025-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10431392B2 (en) | Electrical storage device, manufacturing method of the same, and separator | |
| US12073999B2 (en) | Electrolytic capacitor and method for producing same | |
| US20260011508A1 (en) | Electrolytic capacitor and production method therefor | |
| US12183519B2 (en) | Electrolytic capacitor and production method therefor | |
| JP7796336B2 (ja) | 電解コンデンサおよびその製造方法 | |
| US12136525B2 (en) | Electrolytic capacitor and method for producing same | |
| WO2022145451A1 (ja) | 電解コンデンサ | |
| WO2022145452A1 (ja) | 電解コンデンサ | |
| US20250095923A1 (en) | Electrolytic capacitor and method for manufacturing electrolytic capacitor | |
| US20250104926A1 (en) | Electrolytic capacitor and method for producing electrolytic capacitor | |
| US20250182976A1 (en) | Electrolytic capacitor and method for producing electrolytic capacitor | |
| CN120266237A (zh) | 电解电容器的制造方法、电解电容器、第1处理液以及第2处理液 | |
| WO2024181212A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 | |
| WO2025127090A1 (ja) | 電解コンデンサ | |
| WO2024024887A1 (ja) | 電解コンデンサの製造に用いられる分散体、電解コンデンサの製造方法、および電解コンデンサ | |
| WO2025028057A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 | |
| WO2025028069A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 | |
| JP2025152378A (ja) | 電解コンデンサ | |
| JP2025152379A (ja) | 電解コンデンサ | |
| WO2025028055A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 | |
| WO2025028070A1 (ja) | 電解コンデンサ、電解コンデンサの製造方法、および電解コンデンサ用のシート | |
| WO2025028068A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21875525 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 2022553952 Country of ref document: JP Kind code of ref document: A |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 21875525 Country of ref document: EP Kind code of ref document: A1 |
|
| WWG | Wipo information: grant in national office |
Ref document number: 18247068 Country of ref document: US |