WO2004040605A1 - 電解コンデンサ用電解液及び電解コンデンサ、並びに有機オニウムのテトラフルオロアルミン酸塩の製造方法 - Google Patents
電解コンデンサ用電解液及び電解コンデンサ、並びに有機オニウムのテトラフルオロアルミン酸塩の製造方法 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- 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 electrolytic capacitor and an electrolytic solution for an electrolytic capacitor, and particularly to an aluminum electrolytic capacitor and an electrolytic solution for an aluminum electrolytic capacitor.
- the present invention relates to a method for producing a tetrafluoroaluminate salt of an organic oxide.
- Tetrafluoroaluminates of organoaluminum are used as surfactants, phase transfer catalysts, softeners, antistatic agents such as detergents, dispersants such as asphalt, cement, etc .; disinfectants; preservatives; Blocking agent; a useful chemical substance used in a wide range of fields as an anticoagulant, etc., and is particularly useful as an electrolyte for electrochemical devices such as batteries and electrolytic capacitors.
- Aluminum electrolytic capacitors are characterized by having a large capacitance while being small, and are often used for low-frequency filters and bypasses.
- An aluminum electrolytic capacitor generally has a structure in which an anode foil and a cathode foil are wound around a separator that prevents short-circuiting at both ends, and this is housed in a case and sealed (see Fig. 1 and Fig. 1).
- electrolytes having high electrical conductivity are being actively developed.
- quaternary ammonium salts such as phthalic acid and maleic acid (for example, Japanese Patent Application Laid-Open Nos. Sho 62-145, 715 and Sho 62-1-1) may be added to an aprotic solvent such as y-butyrolactone. 4 5 7 13 No. 3) and quaternary amidini
- a salt eg, WO 95 / 155,572 pamphlet, Japanese Unexamined Patent Publication No. 9-283339
- these electrolytes do not have sufficient ion mobility and the chemical conversion of anode aluminum is insufficient, so that they can generally be used only for capacitors with a rated voltage of 35 V or less. Absent.
- an electrolytic capacitor using this electrolytic solution has a problem that it is difficult to maintain characteristics such as high electrical conductivity, thermal stability, and withstand voltage, which are initially possessed, for a long period of time.
- an electrolytic capacitor using this electrolytic solution has a problem that when a DC voltage is applied to the electrolytic capacitor, a current that often flows after a certain time, that is, a leakage current is large.
- the present inventors have studied by focusing on the moisture in the electrolytic solution.
- the water in the electrolyte is obtained by dissolving an electrolyte such as a quaternary ammonium salt such as phthalic acid and maleic acid in a non-protonic polar solvent such as ⁇ -petit mouth lactone.
- an electrolyte such as a quaternary ammonium salt such as phthalic acid and maleic acid
- a non-protonic polar solvent such as ⁇ -petit mouth lactone.
- Conventional aluminum electrolytic capacitors for use have not been regarded as a problem. For example, even if the electrolyte contained about 3% by weight of water, there was no practical problem. .
- an organic aluminum tetrafluoroaluminate useful as an electrolyte for an electrochemical device a method of reacting an organic aluminum compound with a pyridin-hydrogen fluoride complex (for example, refer to Journalofthe American Chemicalsociety, 1999, Vol. 115, p. 3028), a method of reacting an organoadium tetrafluoroaluminate with an amine compound (eg, Journa 1 of the American Chemical Sci. Ociety, 19993, 115, p.
- a method for synthesizing a polyfluorometallate salt of an organic polymer a method of synthesizing a hydrofluoric acid of a polyfluorometalate and a halogen salt of an organic polymer (for example, Journ alfofOrg anicc Chemistry, 1971, 36 vol.
- ice oxide salts of organoaluminum see, for example, Journa 1 of the Chemical Society, Perkins Pransactions 2, 1978, vol. 3, vol. 254,
- alkali carbonates of organoayuum For example, see Japanese Patent Publication No. 7-11613
- a quaternary ammonium fluoride and hydrogen fluoride are used to synthesize a quaternary ammonium fluoride hydrofluoride salt, and then trifluoride.
- a method of reacting boron for example,
- the present invention and the like provide an organic tetrafluoroaluminate characterized by first reacting hydrogen fluoride, an organic aluminum and aluminum trifluoride.
- a method for producing a salt was invented (Japanese Patent Application No. 2002-129291).
- the gist of the present invention is an aluminum electrolytic capacitor comprising an anode, a cathode made of aluminum, and an electrolytic solution containing an fluorinated anion salt, and heated at 125 ° C. for 50 hours.
- an aluminum electrolytic capacitor comprising an anode, a cathode made of aluminum, and an electrolytic solution containing an fluorinated anion salt, and heated at 125 ° C. for 50 hours.
- XPS X-ray photoelectron spectroscopy
- the gist of the present invention includes a tetrafluoroaluminate salt of a quaternary cyclic amidinium represented by the following formula (1) and a solvent, and is represented by the following formulas (2) to (4).
- An electrolytic solution for an electrolytic capacitor characterized in that the total amount of the compounds is 0.6% by weight or less, and an electrolytic capacitor using the same.
- 1 ⁇ to 1 3 are each independently represents an alkyl group optionally having, location cycloalkyl group which may have a substituent, ⁇ which may have a substituent Li one Represents an aralkyl group which may have a substituent or a substituent,
- X represents an alkylene group which may have a substituent or an arylene group which may have a substituent, or
- any two selected from R 3 and X is bonded to each other, may form a ring, parentheses ring has a nitrogen atom other than the nitrogen atom shown in formula (1) You can.
- RU to R 13 each independently represent a hydrogen atom, an alkyl group which may have a substituent, a cycloalkyl group which may have a substituent, or a substituent which may have a substituent.
- X 1 represents an aryl group or an aralkyl group which may have a substituent;
- X 1 represents an alkylene group which may have a substituent or an arylene group which may have a substituent; or
- any two selected from 1 1 to! ⁇ 13 and X 1 may be bonded to each other to form a ring, and the parenthesis ring is a nitrogen atom other than the nitrogen atom shown in the formula (2). May have atoms, and
- the amino group may be protonated to form a salt.
- R 22 and R 23 each independently represent a hydrogen atom, an alkyl group which may have a substituent, a cycloalkyl group which may have a substituent, and an aryl which may have a substituent A group or an aralkyl group which may have a substituent
- X 2 represents an alkylene group which may have a substituent or an arylene group which may have a substituent, or
- Any two members selected from R 22 , R 23 and X 2 may be bonded to each other to form a ring, and the parenthesis ring has a nitrogen atom other than the nitrogen atom shown in the formula (3). May be doing, and
- the amidine group may be protonated to form a salt.
- R 3 ⁇ R 33 and R 34 each independently represent an alkyl group which may have a substituent, a cycloalkyl group which may have a substituent, or a group which may have a substituent.
- X represents a aryl group or an aralkyl group which may have a substituent
- X 3 represents an alkylene group which may have a substituent or an arylene group which may have a substituent, or Any two members selected from R 3 ⁇ R 33 and X 3 may combine with each other to form a ring, and the parenthesized ring is a nitrogen atom other than the nitrogen atom shown in the formula (4). May have children. )
- the gist of the present invention is to provide (i) hydrogen fluoride and Z or caustic hydrofluoric acid, (ii) an organic aluminum salt, and (iii) an aluminum compound (excluding aluminum trifluoride) and / or
- the present invention relates to a method for producing tetrafluoroaluminate of an organic material, characterized by reacting metal aluminum, and an electrolytic solution for an electrolytic capacitor and an electrolytic capacitor using the same.
- FIG. 1 is a schematic view of a wound type element of an electrolytic capacitor, wherein reference numeral 1 denotes an anode foil, reference numeral 2 denotes a cathode foil, reference numeral 3 denotes a separator, and reference numeral 4 denotes a lead wire.
- FIG. 2 is a cross-sectional view of the electrolytic capacitor.
- Reference numeral 5 denotes a sealing material
- reference numeral 6 denotes an outer case.
- FIG. 3 shows A 12 p spectra of the cathodes of Example 3 and Comparative Example 2.
- the present invention provides an aluminum electrolytic capacitor comprising an anode, a cathode made of aluminum, and an electrolytic solution containing an onium salt of a fluorine-containing anion, wherein the concentration of water in the electrolytic solution is 1% by weight.
- the present invention relates to an aluminum electrolytic capacitor characterized by the following.
- the basic configuration of an aluminum electrolytic capacitor is the same as that of a conventionally known aluminum electrolytic capacitor.
- An anode and a cathode are housed in a case via a separator impregnated with an electrolytic solution.
- an aluminum oxide film layer formed on the surface of aluminum is used.
- aluminum aluminum having a purity of 99.9% or more is usually used.
- the aluminum oxide film layer is formed by chemically treating aluminum in an acidic solution. The surface of the aluminum oxide film is treated by electrochemical etching.Then, the chemical treatment is performed in an aqueous solution of ammonium adipic acid boric acid or phosphoric acid. Can be formed.
- the thickness of the anode is usually 50 to 500 win. ⁇
- Aluminum or an aluminum alloy is used as the cathode.
- Aluminum having a purity of 99.9% or more is used, and aluminum alloy having an aluminum content of about 99% is used.
- the surface of the aluminum may be expanded by etching. Above all, aluminum having a purity of 99.9% and excellent in hydration resistance is preferable.
- the thickness of the cathode is usually 20 to 200111.
- the separator examples include paper such as manila paper and kraft paper, and nonwoven fabrics such as glass fiber, polypropylene, polyethylene, and polyphenylene sulfide. Among them, paper, particularly, manila paper is preferable.
- the electrolytic solution is mainly composed of a fluorine-containing anion salt and a solvent that dissolves the salt.
- M represents an element selected from the group consisting of B, Al, P, Nb, Sb and Ta.
- n a number of 4 or 6 determined by the number of charges of M.
- ayuon represented by the formula (a) include tetrafluoroborate ion, tetrafluoroaluminate ion, hexafluorophosphate ion, hexafluoro mouth niobate ion, and hexafnoroleroantimonate. And a tantalate ion of hexofenole mouth.
- tetrafluoroaluminate ion (A 1 is preferable) since an electroconductive solution having high electric conductivity, excellent thermal stability, and high withstand voltage can be obtained.
- the fluorinated anion may be used alone or in combination of two or more.
- Tet rough Ruo lower Rumin acid ions and other fluorine-containing Anion as Anion proportion of tetrafurfuryl O lower Rumin ion in the fluorine-containing Ayuon is preferably 5-1 0 0 mole 0/0 , more preferably 3 0-1 0 0 mole 0/0, particularly preferably 5 0-1 0 0 mol 0/0.
- the quaternary ammonium salt, the quaternary phosphonium salt, the quaternary imidazolium salt, and the quaternary ammonium salt include the quaternary ammonium salt, the ammonium salt, and the like.
- Trimethylphenylammonium Trimethylphenylammonium, tetraphenylammonium and the like.
- morpholinium such as ⁇ , ⁇ -getyl morpholinium.
- Pyridium such as ⁇ -methylpyridinium, ⁇ -ethylpyridinium, ⁇ - ⁇ -propylpyridinium, ⁇ -isopropylpyridinium, and ⁇ - ⁇ -butylpyridinium .
- Examples include tetramethylphosphonium, triethylmethylphosphonium, and tetraethylphosphonium.
- ammonium salt of ammonium salt examples include trimethylamine, ethyldimethylamine, dimethylmethylamine, triethylamine, pyridine, picoline, pyrimidine, pyridazine, N-methylimidazole, 1,5-diazabicyclo [4.3.0].
- Nonene-5,1,8-diazabicyclo such as dendine-7; getylamine, diisopropylamine, isobutylamine, di-2-ethynolehexynoleamine, pyrrolidine, pyridine Secondary amines such as lysine, monorephorin, hexamethyleneimine; primary amines such as ethylamine, n-propylamine, isopropylamine, t-butylamine, sec-butylamine, 2-ethylhexylamine; 3-methoxypropylamine Has an ether group such as min, 3-ethoxypropylamine And ammonia; Amin that. For ammonia, ⁇ Nmoniumuion is NH 4 +.
- quaternary oxide is preferable, a quaternary amidinium is more preferable, and a quaternary amidinium is most preferable because the obtained electrolytic solution has high electric conductivity and can suppress corrosion of aluminum of the cathode.
- quaternary imidazolium is preferable.
- quaternary imidazoliniums preferred is 1-ethyl-1,2,3-dimethylimidazole.
- Dazolyum is 1,2,3,4-tetramethylimidazolinium.
- the sum of the number of carbon atoms of the quaternary onion ion is preferably from 4 to 12 from the viewpoint of obtaining an electrolytic solution having high electric conductivity.
- the withstand voltage of the electrolytic solution for an electrolytic capacitor tends to increase as the concentration of the fluorinated aion salt in the electrolytic solution decreases, it may be determined according to the desired rated voltage of the capacitor. It may be a concentrated solution of about 0% by weight or a molten salt at room temperature, but is usually at least 5% by weight, preferably at least 10% by weight, usually at most 40% by weight, preferably at most 35% by weight. 0/0 is less than or equal to. If the content of the onium salt of the fluorinated anion is too low, the electric conductivity is low, and if it is too high, the viscosity of the electrolytic solution increases and precipitation tends to occur at low temperatures.
- hydrogen phthalate ion is preferred because an electrolytic solution having high electric conductivity can be obtained and thermal stability is excellent.
- the fluorinated anion salt is mainly used, and the fluorinated anion salt is preferably 5% based on the total weight of the salt. It is preferably at least 0% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, and the proportion of the fluorine-containing anion salt is preferably as high as possible.
- the concentration of the salt other than the fluorinated anion salt is usually 0.1% by weight or more, preferably 1% by weight or more, and usually 2% by weight. 0% by weight or less, preferably 10% by weight or less.
- Solvents for the electrolyte include carbonate, carboxylate, phosphate, nitritole, amide, sulfone, alcohol, ether, sulfoxide, urea, Urethane and the like.
- Examples of the carbonate include chain carbonates such as dimethyl carbonate, ethyl methyl carbonate, getyl carbonate, diphenyl carbonate, and methylphenyl carbonate; ethylene carbonate, propylene carbonate, 2,3-dimethylethylene carbonate, butylene carbonate, vinylene carbonate, and 2-vier. And cyclic carbonates such as ethylene carbonate.
- carboxylic esters examples include aliphatic carboxylic esters such as methyl formate, methyl acetate, methyl propionate, ethyl acetate, propyl acetate, butyl acetate and amyl acetate; aromatic carboxylic esters such as methyl benzoate and ethyl benzoate. And lactones such as y-butyrolactone, ⁇ -butyrolactone, and ⁇ -valero rataton. Of these, ⁇ y—petit mouth rataton is preferred.
- phosphate ester examples include trimethyl phosphate, ethyl dimethyl phosphate, getyl methyl phosphate, and triethyl phosphate.
- nitriles include acetonitrile, propionitrile, methoxyacetonitrile, methoxypropionitrile, glutaronitrile, adiponitrile, 2-methyldartalonitrile, and the like.
- amide examples include N-methylformamide, N-ethylformamide, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidinone and the like.
- snorehon examples include dimethinoles norehon, etinolesmethinoles norehon, ethinoles norephone, sulfolane, 3-methylsulfolane, and 2,4-dimethylsulfolane. Of these, sulfolane and 3-methylsulfolane are preferred.
- the alcohol examples include ethylene glycol, propylene glycol, ethylene glycol monomethyl ether, and ethylene glycol monoethyl ether.
- ethers include ethylene glycol resin methinole ether, ethylene glycol alcohol getyl ether, 1,4-dioxane, 1,3-dioxolan, tetrahydrofuran, 2-methyltetrahydrofuran, 2,6-dimethyltetrahydrofura And tetrahydropyran.
- sulfoxide examples include dimethyl sulfoxide, methylethyl sulfoxide, getyl sulfoxide, and the like.
- Examples of the rare include 1,3-dimethyl-12-imidazolidinone, 1,3-dimethyl-1,3,4,5,6-tetrahydro-12 (1H) -pyrimidinone and the like.
- Examples of urethane include 3-methyl-2-oxazolidinone.
- solvents may be used alone or as a mixture of two or more.
- Y-butyrolactone is preferable because an electrolytic solution having a high electric conductivity can be obtained, excellent characteristics can be exhibited in a wide temperature range, and the electrode material is hardly corroded.
- Sulfolane and 3-methylsulfolane are preferred from the viewpoint of thermal stability. Sulfolane and 3-methylsulfolane may be used in combination with triptyrolactone.
- a low-impedance, high-withstand-voltage electrolytic capacitor that guarantees operation at a usage environment temperature of 110 to 150 ° C. for 100 hours or more can be obtained.
- An aluminum electrolytic capacitor usually contains an element formed by winding or laminating a foil-like anode and a foil-like cathode via a separator impregnated with an electrolyte in an outer case. It is manufactured by inserting a sealing body into the part, drawing the end of the outer case, and sealing it.
- an aluminum or resin case can be used as the outer case.
- An aluminum case that is easy to seal and is inexpensive is preferable.
- Rubber such as butyl rubber and Teflon (R) rubber can be used as the sealing body.
- butyl rubber raw rubber consisting of a copolymer of isobutylene and isoprene, reinforcing materials such as carbon black, fillers such as clay, talc, calcium carbonate, processing aids such as stearic acid and zinc oxide, vulcanizing agents After adding and kneading, a rubber elastic body rolled and molded can be used.
- Vulcanizing agents include alkylphenol formalin resin; dicumylperoxide, 1,1-di- (t-butylperoxy) -1,3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5- Peroxides such as di- (t-butylperoxy) hexane; quinoids such as p-quinonedioxime and ⁇ , ⁇ '-dibenzoylquinonedioxime; Can be.
- the gas permeates through the rubber to some extent, so that the solvent evaporates from the inside of the capacitor to the atmosphere in a high-temperature environment, and from the air in a high-temperature, high-humidity environment. Water enters inside. Under these harsh environments, capacitors may undergo undesirable changes in characteristics, such as a decrease in capacitance, so the surface of the rubber sealing body must be sealed with Teflon to reduce the permeability of solvent vapor. It is preferable to coat with a resin such as (R) or stick a plate such as bakelite. Since the sealing body contains moisture depending on the material, it is preferable to store the sealing body in a dry state, or to use a sealing body that does not generate water.
- a resin such as (R)
- stick a plate such as bakelite
- the aluminum electrolytic capacitor of the present invention may have a hermetic seal structure and a structure hermetically sealed in a resin case (for example, described in JP-A-8-148384).
- a capacitor with a hermetic seal structure or a structure hermetically sealed in a resin case shows stable characteristics even under the above-mentioned harsh environment because the gas permeation amount is extremely small.
- the shape of the aluminum electrolytic capacitor of the present invention is not particularly limited, and may be any shape such as a cylindrical shape, an elliptical shape, a square shape, and a chip type.
- the aluminum electrolytic capacitor of the present invention is characterized in that the concentration of water in the electrolytic solution in the capacitor is 1% by weight or less.
- the concentration of water in the electrolytic solution in the capacitor is preferably 0.8% by weight or less, and more preferably 0.7% by weight or less. The lower the concentration of water, the better, but it is practically difficult to lower the water concentration below 10 ppm, and there is no advantage in reducing the water concentration.
- a dried anode and cathode It is preferable to use a dried anode and cathode. Usually, water having a surface adhesion of 100 ppm or less, preferably 100 ppm or less is used.
- the water content of the separator varies depending on the material, but it is usually about 2% by weight to absorb the moisture in the atmosphere, and about 8% by weight when the humidity in the atmosphere is high. Therefore, it is preferable to dry the separator to remove adhering water before using the separator in manufacturing a capacitor. Usually, drying is performed so that the water content is 1000 ppm or less, preferably 500 ppm, and more preferably 100 ppm or less.
- the electrolyte used for assembling the cooking capacitor usually has a water content of 5000 ppm or less, preferably 1000 ppm or less, and particularly preferably 100 ppm or less.
- the electrolyte used for preparing the electrolyte solution usually has a water content of 1000 ppm or less, preferably 500 ppm or less, more preferably 100 ppm or less.
- the raw materials for electrolyte synthesis and various solvents used in the synthesis process such as methanol and acetonitrile, often contain water. Therefore, in order to reduce the water content of the electrolyte, it is necessary to reduce the water content of the solvent used in the synthesis of the electrolyte, a dehydrating agent such as molecular sieve or alumina, or a synthetic raw material from which water has been removed by treatment such as azeotropic distillation. Can be used.
- electrolytes with reduced water content may be carried into the capacitor due to the incorporation or adhesion of atmospheric moisture, so they may be stored in a dry state, or dried beforehand, It is preferably used for preparing a liquid.
- the solvent used for preparing the electrolytic solution is usually 5000 ppm or less, preferably lOOOppm or less, more preferably 100 ppm or less. Moisture in the solvent is a major factor in determining the amount of water in the obtained electrolyte.
- the amount of moisture in the atmosphere during the assembly of the capacitor is preferably 50% or less, particularly 10% or less, in order to prevent moisture from entering the capacitor.
- an electrolytic solution using an onium salt containing a fluorinated anion as an electrolyte has an electric conductivity of 5 to 3 OmS / cm at 25 ° C, a withstand voltage of 100 to 250 V at 125 ° C, and a conventional non-containing It is characterized by having both high electrical conductivity and high withstand voltage as compared with fluorine anion-based electrolytes.
- an electrolyte system using a quaternary amidinium salt of tetrafluoroaluminic acid as an electrolyte and ⁇ -petit mouth ratataton as a solvent has an extremely excellent electric conductivity of 20 m SZ cm or more and a withstand voltage of 150 V or more.
- the aluminum electrolytic capacitor using this electrolyte has low impedance, high withstand voltage, and excellent thermal stability.
- this electrolyte is affected by water If the amount of water contained in the electrolytic solution in the capacitor is too high, the leakage current of the capacitor will increase, the life characteristics such as equivalent series resistance (ESR) will decrease, and the capacitor will swell due to gas generation. Problems arise. On the other hand, in the aluminum electrolytic capacitor of the present invention, such a problem is solved by suppressing the concentration of water.
- the present invention relates to an aluminum electrolytic capacitor comprising an anode, a cathode made of aluminum, and an electrolytic solution containing an onium salt of a fluorine-containing aun, which was heated at 125 ° C. for 50 hours.
- an aluminum electrolytic capacitor comprising an anode, a cathode made of aluminum, and an electrolytic solution containing an onium salt of a fluorine-containing aun, which was heated at 125 ° C. for 50 hours.
- XPS X-ray photoelectron spectroscopy
- the basic configuration of the aluminum electrolytic capacitor, the anode, the cathode, the separator, the electrolytic solution, and the production of the aluminum electrolytic capacitor are as described in the first embodiment.
- the cathode is a surface treatment such as aluminum and aluminum-copper alloys with excellent corrosion resistance, such as aluminum and aluminum-copper alloy with purity of 99.9%, and anodic oxidation and titanium deposition, etc., in terms of suppressing fluorination of the cathode surface. And the like are particularly preferred.
- the electroconducting solution contains dinitro compounds such as p-nitrobenzoic acid, p-nitrophenol, and m- nitroacetophenone in the electrolyte.
- a compound that suppresses fluorination of the cathode such as acidic ester phosphate such as monobutyl phosphate, dibutyl phosphate, dioctyl phosphate, and monooctyl phosphonate.
- the water content of the electro-mechanical solution is small.
- the water content is 500 ppm or less.
- the water content is preferably 100 ppm or less, particularly preferably 100 ppm or less.
- the concentration of water in the electrolytic solution in the capacitor is preferably 1% by weight or less.
- the water content in the atmosphere at the time of assembling the capacitor is preferably 50% or less, particularly 10% or less, in order to prevent moisture from entering the capacitor. In the atmosphere The lower the water content, the better.
- the surface of the cathode of the capacitor is subjected to X-ray photoelectron spectroscopy (hereinafter referred to as “XPS”).
- XPS X-ray photoelectron spectroscopy
- Electrolyte containing fluorinated aeon-containing electrolyte as an electrolyte has an electric conductivity of 5 to 30 mS / cm at 25 ° C and a withstand voltage of 100 to 250 V at 125 ° C. It is characterized by having both high electrical conductivity and high dielectric strength compared to electrolyte.
- an electrolysis solution using a quaternary amidinium salt of tetrafluoroaluminic acid as an electrolyte and y-butyrolactone as a solvent has extremely excellent properties of an electric conductivity of 2 OmSZcrn or more and a withstand voltage of 150 V or more.
- an aluminum electrolytic capacitor using this electroconducting liquid has low impedance, high withstand voltage, and excellent thermal stability.
- the reaction between the fluorinated anion-containing salt and the aluminum foil of the negative electrode of the capacitor is likely to occur, and as a result, the surface of the negative electrode forms an A1-F bond.
- This causes problems such as deterioration of life characteristics such as equivalent series resistance (ESR) and swelling of the capacitor due to gas generation.
- ESR equivalent series resistance
- such a problem does not occur because the fluorination of the cathode is prevented by regulating the moisture in the electrolyte, adding an auxiliary agent, and selecting the material of the cathode. No.
- the electrolytic solution for an electrolytic capacitor of the present invention contains a tetrafluoroaluminate represented by the formula (1).
- Examples of the cycloalkyl group include cycloalkyl groups having 3 to 8 carbon atoms, preferably 5 to 7 carbon atoms, such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
- aryl group examples include aryl groups having 6 to 14 carbon atoms, preferably 6 to 10 carbon atoms, such as a phenyl group, a trinole group, and a naphthyl group.
- Aralkyl groups include benzyl, phenethyl, naphthylmethyl, etc.
- And 11 preferably an aralkyl group having 7 to 8 carbon atoms.
- alkyl group, cycloalkyl group, aryl group and aralkyl group may have a substituent.
- substituents include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, and an n- An alkyl group having 1 to 6 carbon atoms such as a butyl group, an n-pentyl group and an n-hexyl group; a cycloalkyl group having a carbon number of 3 to 6 such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group or a cyclohexyl group; C6-C10 aryl groups such as phenyl, tolyl and naphthyl; C7-C11 aralkyl such as benzyl, phenethyl and naphthylmethyl; methoxy and ethoxy An alkoxy group having 1 to 6 carbon atom
- Examples of the substituent represented by X include an alkylene group having 1 to 4 carbon atoms, preferably 2 to 3 carbon atoms, such as a methylene group, an ethylene group, a trimethylene group, and a tetramethylene group; a 1,2-phenylene group And an arylene group having 6 to 14 carbon atoms, such as a 2,3-naphthylene group, preferably having 6 carbon atoms.
- alkylene groups and arylene groups may have a substituent.
- substituents include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an n-pentyl group, n-alkyl group having 1 to 12 carbon atoms such as hexyl group; cycloalkyl group having 3 to 14 carbon atoms such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group and adamantyl group; phenyl group Aralkyl groups having 6 to 10 carbon atoms, such as benzene, trinole, naphthyl, etc .; aralkyl groups having 7 to 11 carbons, such as benzyl, 1-phenylethyl, 2-phenyl-, 2-naphthylmethyl, etc.
- a compound represented by formula is 1 ⁇ to 1 3 and any two of which are selected from X bonded to each other, may form a ring, this ring is shown in (1) May have a nitrogen atom other than the two nitrogen atoms
- Specific examples of the compound represented by the formula include quaternary imidazolinium, quaternary tetrahydropyridinium, and quaternary amidium tetrafluoroaluminate having a functional group such as a hydroxyl group or an alkoxy group. Salts.
- quaternary imidazolinium the quaternary tetrahydroxypyridinium, and the quaternary amidium having a functional group such as a hydroxyl group or an alkoxy group are as described in the first embodiment.
- quaternary imidazolinium is preferable because it has a high electric conductivity of the obtained electrolytic solution and can suppress corrosion of aluminum of the cathode, and among them, 1.1-ethyl-1,2,3-dimethylimidazoline is preferable. Rimum, 1,2,3,4-tetramethylimidazolinium are more preferred.
- the molecular weight of the compound of the formula (1) is usually 99 or more and 281 or less, and particularly preferably 113 or more and 141 or less.
- alkyl group represented by the formula 11 to! ⁇ 3 a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an n-pentyl group, an n-pentyl group
- alkyl group having 1 to 12 carbon atoms such as a hexyl group, and particularly an alkyl group having 1 to 4 carbon atoms.
- Examples of the cycloalkyl group include a cycloalkyl group having 3 to 12 carbon atoms, particularly 5 to 7 carbon atoms, such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
- Examples of the arylene group include aryl groups having 6 to 14 carbon atoms, particularly 6 to 10 carbon atoms, such as phenyl, tolyl, and naphthyl.
- Examples of the aralkyl group include aralkyl groups having 7 to 11 carbon atoms, particularly 7 to 9 carbon atoms, such as benzyl group, 1-phenylethyl group and 2-naphthylmethyl group.
- alkyl group, cycloalkyl group, aryl group and aralkyl group may have a substituent.
- the strong substituent include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, and an n-propyl group.
- Alkyl group having 1 to 6 carbon atoms such as butyl group, n-pentyl group and n-hexyl group; and 3 to 6 carbon atoms such as propyl group, cyclobutyl group, pentyl group and cyclohexyl group.
- Cycloalkyl group carbon number 6 to of phenyl group, tolyl group, naphthyl group and the like: aryl group of L0; aralkyl group of carbon number 7 to 11 of benzyl group, phenethyl group and naphthylmethyl group;
- a C 1-6 alkoxy group such as a ethoxy group, an ethoxy group, an n -propoxy group and an i-propoxy group; Examples include a xyl group, an amino group, a nitro group, a cyano group, a carboxyl group, a formyl group, and a carboel group.
- Examples of the substituent represented by X 1 include an alkylene group having 1 to 4 carbon atoms, such as a methylene group, an ethylene group, a trimethylene group, and a tetramethylene group, and particularly, an alkylene group having 2 to 3 carbon atoms; And arylene groups having 6 to 14 carbon atoms, particularly 6 arylene groups such as 2,2,3-naphthylene group.
- alkylene groups and arylene groups may have a substituent, and examples of the substituent include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and an n-pentyl group.
- An alkyl group having 1 to 12 carbon atoms such as n-hexyl group; cycloalkyl group having 3 to 14 carbon atoms such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group and adamantyl group; Aryl groups having 6 to 10 carbon atoms, such as benzyl, tolyl, and naphthyl; aralkyl having 7 to 11 carbons, such as benzyl, 1-phenylethyl, 2-phenylethyl, and 2-naphthylmethyl; Groups: hydroxy, amino, nitro, cyano, carboxyl, and formyl groups.
- any two selected from R 11 to R 13 and X 1 may be bonded to each other to form a ring, and this ring is represented by ( 2) shown in equation
- It may have a nitrogen atom other than two nitrogen atoms.
- N-methyl-N- (2-methylaminoethyl) formamide N-ethyl-N- (2-methylaminoethyl) formamide, N- (2-methylaminoethyl) N-methyl Formamide, N-ethyl-N- (2-ethylaminoethyl) Formamide, N-methyl-N— (2-n-propylaminoethyl) Formamide, N— (2-methylaminoamino) 1-ethyl-N-propynolehonolemamide, N-butyl-1-N- (2-methylaminoethyl) formamide, N- (2-n-butylaminolethyl) N-methyl-1-formamid N, N-methyl-N- (1-Methyl-1-methylaminoethyl) formamide, N-methyl-N— (2-methyl-1-methylaminoethyl) formamide, N-methyl-N— (2-phenylaminoeth
- N-ethyl-N- (2-methylaminoethyl) propionamide N- (2-ethylaminoethyl) 1-N-methyl-1-propionamide, N-methyl—N— (2-methylaminoethyl) propionamide, N-methyl-1-N—
- N- (2-methylaminoethyl) pentanoamide N-methyl-1-N— (2-methylaminoethyl) hexanoamide, N-methyl-1-N— (2-methylaminoethyl) heptanoamide, N-methyl-1-N — (2-Methylamino-ethyl) otanoamide, N-methyl-N- (2-methylamino-ethyl) dodecanoamide, N-methyl-N- (2-methylamino-ethyl) hexadecanoamide, N-Petyl N- (2-ethylamino-ethyl) -butylamide, N- (2-butylamino-ethyl) -aliphatic amide such as N-isobutylamide;
- Aromatic amides such as N-methyl-N- (2-methylamino-ethyl) benzamide, N-methyl-N- (2-methylamino-ethyl) phenylacetamide; N— (3 —Methylamino-propyl) 1-tetramethylene imine-2-one,
- N-methyl-N- (2-methylaminoethyl)-(2-hydroxypropion) amide N- (2-hydroxyethyl) -N- (2-methyl Aminoethyl) acetoamide
- N— (2- (n-butane-1-3-one-ylamino) monoethyl 1) N-methyl-acetamide
- N-Ethyl-1-N- (2-methylaminoethyl) formamide N— (2-Ethylaminoethyl) N-methyl-1-formamide, N-Ethyl-1-N— (2-Ethylaminoethyl) formamide , N-methyl-1-N- (1-methyl-1-methylaminoethyl) formamide, N-methyl-1-N— (2-methyl-12-methylaminoethyl) formamide, N-methyl-1-N— (2-phenylamino-1 Ethyl) formamide, N- (2-methylaminoethyl) 1-N-phenyl-formamide, N-benzyl-1-N- (2-methylamino-ethyl) formamide, N— (2-benzylamino) Formyl) Formamide such as 1N-methyl-formamide;
- 2-Aminoethyl) acetoamide N-methyl-N- (2-methylaminoethyl) acetoamide, N- (2-methyl-2-methylaminoethyl) acetoamide, N-ethyl-N- (2-methylamino) 1-ethyl) acetoamide, N— (2-ethylaminoethyl) 100-methyl-1-acetamide, ⁇ -methyl- ⁇ — (1-methyl-1-2-methylaminoethyl) acetoamide, ⁇ -methyl-1 ⁇ — (2-methyl
- Aromatic amides such as N-methyl-N- (2-methylamino-ethyl) benzamide and N-methyl-N- (2-methylamino-ethyl) benzylamide are typical impurities.
- the alkyl groups represented by R 22 and R 23 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an n-pentyl group, and an n-hexyl Examples thereof include an alkyl group having 1 to 12 carbon atoms, particularly an alkyl group having 1 to 4 carbon atoms.
- Cycloalkyl groups include cyclopropyl, cyclobutyl, cyclo Examples thereof include a cycloalkyl group having 3 to 12 carbon atoms, particularly 5 to 7 carbon atoms, such as a pentyl group and a cyclohexyl group.
- aryl group examples include aryl groups having 6 to 14 carbon atoms, particularly 6 to 10 carbon atoms, such as a phenyl group, a tolyl group, and a naphthyl group.
- aralkyl group examples include aralkyl groups having 7 to 11 carbon atoms, such as benzyl group, 1-phenylethyl group, and 2-naphthylmethyl group, and particularly 7 to 9 carbon atoms.
- An arylene group having 6 to 14 carbon atoms such as a 1,2-phenylene group and a 2,3-naphthylene group, and particularly 6 arylene groups may be mentioned.
- any two selected from R 22 , R 23 and X 2 may be bonded to each other to form a ring, and the ring is represented by the formula (3) May have a nitrogen atom other than the two nitrogen atoms.
- Amidine groups may be protonated.
- 2-methylimidazoline 1,2-dimethylimidazoline, 2,4-dimethylimidazoline, 1-ethyl-1-2-methylimidazoline, 1,2,4-trimethinole imidazoline, 2-ethylimidazoline, 2-ethyl-1-1-methyl Imidazoline, 1, 2-getyl imidazoline, 3-methyl-2-n-n-decyl imidazoline,
- Typical impurities represented by the formula (3) are 1-ethyl-2-methylimidazoline, 1,2,4-trimethylimidazoline, 2,4-dimethylimidazoline, and 2-imidazoline.
- Examples of the aryl group include an aryl group having 6 to 14 carbon atoms, particularly 6 to 10 carbon atoms, such as a phenyl group, a trinole group, and a naphthyl group.
- Examples of the aralkyl group include aralkyl groups having 7 to 11 carbon atoms, particularly 7 to 9 carbon atoms, such as benzyl group, 1-phenylethyl group and 2-naphthylmethyl group. These alkyl group, cycloalkyl group, aryl group and aralkyl group may have a substituent.
- Examples of a strong substituent include a methyl group, an ethyl group, an n-propyl group, an i-propyl group and an n-propyl group.
- Alkyl groups having 1 to 6 carbon atoms such as butyl group, n-pentyl group, n-hexyl group; and 3 to 3 carbon atoms such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group and the like.
- methylene group, ethylene group, trimethylene group, having 1 to 4 carbon atoms such as tetramethylene group, especially an alkylene group having 2 to 3 carbon atoms; 1, 2-phenylene group And arylene groups having 6 to 14 carbon atoms, particularly 6 arylene groups such as 2,3, -naphthylene group.
- alkylene groups and arylene groups may have a substituent.
- substituents include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an n-pentyl group, C1-C12 alkyl group such as n-hexyl group; cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, A cycloalkyl group having 3 to 14 carbon atoms such as a damantyl group; an aryl group having 6 to 10 carbon atoms such as a phenyl group, a trinole group, and a naphthyl group; a benzyl group, a 1-phenylethyl group, a 2-phenylethyl group, and a 2-phenyl group An aralkyl group having 7 to 11 carbon atoms such as a naphthy
- any two members selected from R 31 , R 33 and X 3 may be bonded to each other to form a ring.
- It may have a nitrogen atom other than the two nitrogen atoms shown in the formula.
- Typical examples of the impurity compound represented by the formula (4) are 1-ethyl-2-methoxycarbonylmethyl-3-methylimidazolidinum and 2-methoxycarbonylmethylmethyl.
- 1,3,4-trimethylimidazolinium have a relatively low molecular weight and therefore have a higher molar concentration when compared at the same weight concentration, and tend to increase the leakage current of the capacitor.
- the molecular weight of the cation of the compound of the formula (4) present in the electrolytic solution is usually 170 or more and 470 or less, but often 180 or more and 290 or less.
- the present invention is characterized in that the total amount of the compounds represented by the formulas (2) to (4) in the electrolytic solution is 0.6% by weight or less. If the total amount of the compounds represented by the formulas (2) to (4) exceeds 0.6% by weight, the leakage current of the obtained capacitor increases.
- the total amount of these compounds is preferably at most 0.5% by weight, particularly preferably at most 0.4% by weight.
- the lower limit is not particularly limited, and it is considered that these compounds are most preferably not contained.
- the total amount of the compounds of the formulas (2) to (4) can be easily obtained by analyzing the electrolytic solution.
- Methods for quantitative analysis of impurities include liquid chromatography, ion chromatography, gas chromatography, capillary electrophoresis, GC / MS,
- the cation moiety of the salt of the formula (1) is usually an alkyl carbonate synthesized by an alkylation reaction of the cyclic amidine compound represented by the formula (3) with a dialkyl carbonate. It is synthesized using an alkyl cyclic amidinium as an intermediate material.
- the cyclic amidine compound represented by the formula (3) or the alkylalkyl carbonate cyclic amidinium undergoes a hydrolysis reaction by water to produce a compound represented by the formula (2). Further, a compound represented by the formula (4) is produced as a side reaction.
- the cation portion of the salt of the formula (1) is represented by the formulas (2) to (4).
- the indicated compound is accompanied.
- the compounds of the formulas (2) to (4) are often mixed in about 0.8% by weight as the concentration in the electrolyte.
- a raw material having a low moisture content may be used, or an inert gas atmosphere may be used.
- the method include a method of suppressing the hydrolysis reaction by performing the reaction below, and a method of controlling the reaction temperature to suppress the reaction by-producing the carbonyl compound.
- a method of synthesizing the salt represented by the formula (1) and removing impurities by recrystallization may be employed. Among them, the latter recrystallization method is preferable since the highest purity electrolytic solution can be obtained.
- the withstand voltage of the electrolytic solution for electrolytic capacitors tends to increase as the concentration of the salt represented by the formula (1) decreases, it is determined by the desired rated voltage of the capacitor. It may be a concentrated solution of about 50% by weight or a molten salt at room temperature, but is usually at least 5% by weight, preferably at least 10% by weight, usually at most 40% by weight, Preferably 35 weight. / 0 or less. If the content of the salt represented by the formula (1) is too low, the electric conductivity is low. If the content is too high, the viscosity of the electrolyte increases, and precipitation tends to occur at low temperatures.
- the tetrafluoroaluminate ion portion in the salt represented by the formula (1) may contain a salt in which another anion is replaced.
- Specific examples of such anions include, for example, a fluorine-containing inorganic ion, tetrafluoroborate ion, hexafenoleophosphate ion, hexafluoroarsenate ion, hexaforenoantimonate ion, and hexafluoroenomonate ion.
- Fluorine-containing inorganic ions such as funoroloebobate ion and hexafenoleolotantalate ion; carboxylic acids such as hydrogen phthalate ion, hydrogen maleate ion, salicylate ion, benzoate ion and adipate ion
- Sulfonic acid ions such as benzenesnolephonic acid, tonoleensnolephonic acid, dodecinolevene sulfonic acid ion, trifluoromethane sulfonic acid ion, perfluorobutane sulfonic acid; borate ion, phosphate ion
- Inorganic oxoacid ions such as bis (trifluoromethanesulfonyl) imide ion, bis (pentafluoroethanesulfonyl) imide ion, tris (trifluoromethanesulfonyl) meth
- the concentration of the salt other than the salt represented by the formula (1) is usually 20% by weight or less, preferably 10% by weight. It is as follows.
- the concentration of the salt other than the salt represented by the formula (1) is usually 20% by weight. / 0 or less, preferably 10% by weight or less.
- the solvent for the electrolytic solution include carbonate, carboxylate, phosphate, etril, amide, sulfone, alcohol, ether, sulfoxide, urea, and urethane. The solvent is as described in the first embodiment.
- the water content in the solvent is a major factor affecting the water content in the obtained electrolyte solution. The water content is usually 500 ppm or less, preferably 100 ppm or less, more preferably 100 ppm or less. Used.
- Examples of the electrolytic capacitor using the electrolytic solution according to the present invention include an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, and a niobium electrolytic capacitor.
- the basic structure of the aluminum electrolytic capacitor, the anode, the cathode, the separator, and the fabrication of the aluminum electrolytic capacitor are as described in the first embodiment.
- the cathode foil a foil obtained by forming a thin film of titanium nitride on the surface of an etched aluminum foil (for example, described in Japanese Patent Application Laid-Open No. Hei 9-198654) may be used.
- the present invention provides (i) hydrogen fluoride and / or ky hydrofluoric acid, (ii) an organic aluminum salt, and (iii) an aluminum compound (provided that aluminum trifluoride And a method for producing an organic tetrafluoroaluminate, characterized by reacting Z or metallic aluminum.
- One of the raw materials in the production method of the present invention is an organoaluminum salt, which is preferably represented by formulas (5) to (7):
- Q represents an organic atom
- R represents a hydrogen atom or an alkyl group having 10 or less carbon atoms
- X represents a halogen atom
- Examples of the alkyl group having 10 or less carbon atoms defined by R include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group, and an n- Octyl group, n-decyl group and the like.
- Examples of the halogen atom defined by X include a fluorine atom, a chlorine atom, and a bromine atom.
- a reaction for introducing a halogen is involved, but in the production method of the present invention, since it is reacted with hydrogen fluoride and / or hydrofluoric acid, bothersome. It is industrially advantageous that there is no reaction step for introducing halogen. In this regard, it is preferable to use an organic salt containing no halogen atom.
- the organic atom in the present invention is a general term for a compound containing an element having a lone pair of electrons (nitrogen, phosphorus, etc.), which is formed by coordinating a proton or another cation to these lone pair of electrons.
- an element having a lone pair of electrons nitrogen, phosphorus, etc.
- those represented by the following formula (8) are preferably used.
- 1 ⁇ to 1 4 are each independently a hydrogen atom, which may have a substituent alkyl group, which may have a substituent cycloalkyl group which may have a substituent Ariru Represents an aralkyl group which may have a group or a substituent, but two or more of ⁇ to do not simultaneously represent a hydrogen atom, or
- Ri to R 4 may be partially or entirely bonded to each other to form a ring, and when forming such a ring, a nitrogen atom may be present on the constituting ring; and A is nitrogen Represents an atom or a phosphorus atom.
- the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group and a cyclohexyl group.
- the aralkyl group include aralkyl groups having 7 to 20 carbon atoms, such as benzyl, phenethyl, and naphthylmethyl groups, and more preferably aralkyl groups having 7 to 11 carbon atoms. Groups.
- alkyl group, cycloalkyl group, aryl group and aralkyl group may have a substituent, such as a hydroxyl group, an amino group, a nitro group, a cyano group, a carboxyl group, a formyl group and the like. Is mentioned.
- organic monomer represented by the above formula (8) include a quaternary ammonium, a quaternary phosphonium, a quaternary imidazole, a quaternary cyclic amidinium, and an ammonium.
- organic salt an organic salt And a coordination compound such as water / methanol.
- Examples of the quaternary ammonium include the ions of the tetraalkyl ammonium, the aromatic-substituted ammonium, the aliphatic cyclic ammonium, and the nitrogen-containing heterocyclic aromatic compound described in the first embodiment.
- Examples of the quaternary phosphonium and quaternary imidazolyme include the specific examples described in the first embodiment.
- As the quaternary amidinium specific examples of the quaternary imidazole, the quaternary tetrahydropyrimidium, and the quaternary amidium having a hydroxyl group, an ether group and the like described in the first embodiment can be mentioned.
- ammonium examples include trimethylammonium, ethyldimethylammonium, acetylmethylammonium, triethylammonium, pyridinium, N-methylimidazolyum, 1,5-diazabicyclo [4.3. [0] nonane-5,1,8-diazabicyclo [5.4.0] indesenium-17 and the like.
- organic monomers having a total carbon number of 4 to 12 are preferred, and among them, tetraethylammonium, triethylmethylammonium, getyldimethylammonium, ethyltrimethylammonium, and tetramethylammonium N, N-dimethylpyrrolidinium, N-ethyl-N-methyl / pyrrolidinium, 1,3-dimethylimidazolidum, 1,2,3-trimethylimidazolidum, 1-ethyl-3 Methylimidazolime, 1-Ethyl-2,3-dimethylimidazolime, 1,2,3,4-Tetramethylimidazolime, 1,3-Jethylimidazolime, 2-Ethyl-1,3-dimethylimidazolime, 1, 3-Dimethyl 2- ⁇ -propylimidazolym, 1,3-Dimethyl-2- ⁇ -pentylimidazole, 1,3-Dimethyl-2-
- the compound is at least one compound selected from the group consisting of room temperature, 2-phenyl-1,3-dimethylimidazolinium, and 2-benzyl-1,1,3-dimethylimidazolinium, More preferred are 1-ethyl-2,3-dimethylimidazolinium and 1,2,3,4-tetramethylimidazolinium.
- organic salts can be used as they are, or can be used after dissolving in a solvent inert to the reaction.
- the quaternization reaction solution can be used as it is.
- a reaction solution obtained by quaternizing 1-ethyl-2-methylimidazole with dimethyl carbonate can be used as it is.
- Aluminum compounds include aluminum hydroxide, aluminum oxide, aluminum chloride, aluminum acetate, aluminum bromide, aluminum nitrate, aluminum sulfate, aluminum phosphate, aluminum sulfate, aluminum aluminum sulfate, aluminum carbonate, and alumina white. Any material except chemical aluminum can be used.
- aluminum hydroxide, aluminum oxide, metal aluminum, aluminum chloride, and particularly preferably aluminum hydroxide are used.
- aluminum hydroxide examples include sol-type aluminum hydroxide, dried aluminum hydroxide gel, and crystalline aluminum hydroxide (diaspore, boehmite, pseudo-boehmite, gibbsite, bayerite, Nordstrandite, etc.). , Hydroxylation Aluminum oxide or the like can be used. Of these, gibbsite is particularly preferred. As the aluminum oxide, for example, alumina, sol alumina, fused alumina, activated alumina, low soda alumina, and ultrafine aluminum oxide can be used. Still another one of the raw materials in the production method of the present invention is hydrogen fluoride or ky hydrofluoric acid as a fluorine source.
- Solvents usable in the production method of the present invention include, for example, water; methanol, ethanol, and n-prono. Knoll, Isoprono II. Alcohols such as phenol and n-butanol; ketones such as acetone, methylethyl ketone, getyl ketone, and methyl isobutyl ketone; getyl ether, ethyl- n -propyl ether, ethyl-l-isopropyl ether, di-n-propyl Ethers, diisopropyl ether, n-propi-isopropinole ether, dimethoxetane, methoxetoxetane, diethoxytetane, tetrahydrofuran, etc .; ethers such as acetonitrile, propioetrile, etc .; pentanes, hexane, heptane
- the ratio should not exceed 10 mol times, especially 8 mol times, with respect to aluminum of the aluminum source, and usually 3 to 5 mol times. It is preferably 3.5 to 4.5 mole times, particularly preferably 3.8 to 4.2 mole times.
- the organic salt is a fluoride salt In some cases, it may be slightly less than the above, usually 2 to 4 times, preferably 2.5 to 3.5 times, particularly preferably 2.8 to 3.2 times.
- the ratio is not more than 1.7 mol times, especially 1.3 mol times, of the aluminum of the aluminum source. It is 5 to 0.83 mole times, preferably 0.58 to 0.75 mole times, particularly preferably 0.63 to 0.7 mole times.
- the organic salt is a fluoride salt
- the amount may be slightly lower as described above, usually 0.33 to 0.67 mol, preferably 0.42 to 0.58 mol, particularly preferably. Or 0.47 to 0.53 mole times.
- hydrogen fluoride and caffeic hydrofluoric acid can be used together in an optional ratio.
- the excess fluorine is converted into tetrafluoroaluminum. It further binds to the acid and easily produces by-products with excessively advanced fluorination, such as pentafluoroaluminic acid and hexafluoroaluminic acid, and increases the selectivity of the target tetrafluoroaluminate. Lower. Therefore, industrially, when X mole of hydrogen fluoride and y mole of caffeic hydrofluoric acid are used, x + y X6 exceeds 10 mole times of aluminum as aluminum source.
- the aluminum source may be used alone or in combination of two or more.
- the amount of the aluminum source is usually 0.5 to 10 times, preferably 0.8 to 2 times, in terms of a molar ratio of aluminum atom to the organic onium salt. Particularly preferred is 0.9 to 1: I. 2 times, but a 0.9 to 1 time is more excellent in safety.
- aluminum trifluoride can be used in combination with the aluminum compound or metallic aluminum. However, the combined use of a large amount of aluminum trifluoride is contrary to the purpose of the present invention in that aluminum trifluoride is replaced with another aluminum source and a fluorine source.
- aluminum trifluoride when used in combination, it should be used in an amount of 50% or less as aluminum with respect to other aluminum sources. It is preferable to use them together so as to be 25% or less, particularly 10% or less. Note that it is preferable to use trihydrate as aluminum trifluoride.
- the reaction method is, for example, a method in which an organic aluminum salt is added to hydrogen fluoride or ky hydrofluoric acid, and then an aluminum compound is added; hydrogen fluoride or ky hydrofluoric acid is added to the organic oxalate, and then aluminum is added.
- a preferred method is to add an aluminum compound to hydrogen fluoride or ky hydrofluoric acid, and then to add an organic onium salt; to the aluminum compound, add hydrogen fluoride or fluorinated hydrofluoric acid;
- a method of adding an organic aluminum salt a method of adding hydrogen fluoride or calcium hydrofluoric acid and an aluminum compound simultaneously or alternately, and then adding an organic aluminum salt.
- dissolve them in a solvent or Dispersion may be carried out, or a solvent may be charged in the reactor in advance and added thereto.
- the reactor is preferably an acid-resistant reactor that has been subjected to polytetrafluoroethylene lining.
- the reaction temperature is not limited, but the reaction is usually carried out at a temperature of from 120 to 150 ° (preferably from ⁇ 10 to 50 ° C., more preferably from 0 to 25 ° C. In the present invention, the reaction is carried out. Can be carried out twice, in which case the subsequent reaction temperature is preferably set to be equal to or slightly higher than that of the first reaction.
- the reaction pressure is not limited, but is usually carried out at normal pressure.
- the reaction atmosphere is not particularly limited, and may be an air atmosphere, but is preferably performed under an inert gas atmosphere such as nitrogen or argon.
- the salt has high purity. It is used after purification.
- the organic tetrafluoroaluminate obtained by the present invention is useful in the fields of surfactants, electrolytes for electrochemical devices such as batteries and capacitors, phase transfer catalysts, antistatic agents and the like. It is a compound and is particularly useful as an electrolyte for electrochemical devices such as electrolytic capacitors.
- Ion hexafluoro mouth antimonate ion, hexafluoroniobate on, hexafluorotanta Fluorine-containing inorganic ions such as luate ion; hydrogen phthalate ion, hydrogen maleate, salicylate ion, benzoate ion, carboxylate ion such as adipate ion; benzenesulfonic acid ion, toluenesulfonic acid ion; Dodecylbenzene Snorefonate ion, Trinoleolomethanesnolephonate ion, Sulfonate ion such as Nofnoroleolobutane sulfonic acid; Inorganic oxoate ion such as borate ion, phosphate ion, etc .; Honi-imido ion, bis (pentafunoleno-mouth ethanes-norehon
- tetrafluoride of organoaluminum When an aluminate is used in combination with hydrogen phthalate, hydrogen maleate, or the like, it is preferable that tetrafluoroaluminate is mainly used, and tetrafluoroaluminate is used based on the total weight of the salt.
- the salt is preferably at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, and the higher the ratio, the more preferable.
- the concentration of the tetrafluoroaluminate of the organic material is preferably 5 to 40% by weight. / 0 , more preferably 10 to 35 weight. / 0 . This is because if the concentration is too low, the electric conductivity is low, and if the concentration is too high, the viscosity of the electrolytic solution increases, and salt precipitation at low temperatures tends to occur. Generally, the withstand voltage of the electrolytic solution for electrolytic capacitors tends to increase as the concentration decreases, so that the optimum concentration can be determined according to the rated voltage of the desired capacitor.
- the electrolytic solution of the present invention may be a concentrated solution containing 50% or more of a salt, or may be a room temperature molten salt.
- the electrolytic solution of the present invention preferably contains a solvent in an amount of 50% by weight or more from the viewpoint of obtaining an electrolytic solution having more excellent electric conductivity, thermal stability, and withstand voltage.
- the solvent include one or more selected from the group consisting of carbonate, carboxylate, phosphate, nitrile, amide, sulfone, alcohol, and water, and include carbonate, carboxylate, and phosphorus. Acid esters, nitriles, amides, sul Solvents selected from hon and alcohol are preferred because they tend to exhibit stable characteristics over time when used in an electrolytic solution.
- water it is preferable to use it as a part of the solvent in combination with another solvent.
- ester carbonate, ester / potassium olevonate, esternole phosphate, nitrinole, amide, snorehon, and alcohol are as described in the first embodiment.
- a non-aqueous solvent in which the solvent has a relative dielectric constant of 25 or more and 25 ° C), and from the viewpoint of safety I "
- the solvent is preferably a non-aqueous solvent having a flash point of 70 ° C. or higher.
- the solvent has a boiling point of 250 ° C. or higher and a melting point of 60 ° C.
- a solvent having a temperature of about 40 ° C. and a dielectric constant ( ⁇ , 25 ° C.) of 25 or more is contained in an amount of 25% by weight or more based on the total weight of the solvent.
- the solvent contains at least 40% by weight, especially at least 50% by weight of the solvent.
- examples of such a solvent include sulfone, and sulfolane and 3-methylsulfolane are particularly preferable.
- the solvent should have a boiling point of 190 ° C or more, less than 250 ° C, a melting point of 60 to 40 ° C, and a dielectric constant ( ⁇ , 2 (5 ° C) It is preferable that the solvent containing 25 or more is contained in an amount of 25% by weight or more based on the total weight of the solvent. Among them, preferred is such a solvent in an amount of 40% by weight or more, particularly
- Such a solvent include carbonate, carboxylate, phosphate, nitrile, amide and alcohol, and ⁇ -butyrolactone and ethylene glycol are particularly preferred.
- a particularly preferred electrolytic solution is a solvent in which sulfolane is used, and tetrafluoroaluminate or 1,2,3,4-ester of 1-ethyl-1,2,3-dimethylimidazolinium.
- Electrolyte capacitors containing 5 to 40% by weight of tetrafluoroaluminate of tetramethylimidazolyum based on the total weight of the electrolyte Lysis.
- the solvent is ⁇ -petit mouth rataton, and tetrafluoroaluminic acid or 1-ethyl-1,2,3-dimethylimidazolinium salt is used.
- the electrolytic solution of the present invention may contain various additives in addition to the above salts and solvents.
- the purpose of adding additives to the electrolyte solution is wide-ranging, such as improving electrical conductivity, improving thermal stability, suppressing electrode deterioration due to hydration or dissolution, suppressing gas generation, improving withstand voltage, and improving wettability. And the like.
- the content of the additive is not particularly limited,
- It is preferably in the range of 0.1 to 20% by weight, and more preferably in the range of 0.5 to 10% by weight.
- the electrolytic solution of the present invention may be solidified by adding a polymer compound thereto, and used as a so-called gelled electrolytic solution.
- a polymer compound used as a so-called gelled electrolytic solution.
- the polymer used in such a gelling electrolyte include polyethylene oxide, polyacrylotrile, polytetrafluoroethylene, polyvinylidene fluoride, polymethyl methacrylate, and the like. .
- the life of the capacitor is not limited to 1%.
- the effect on life was small.
- capacitors using the electrolyte of the present invention can be used in a high voltage range up to the rated voltage of 10 OV class, and satisfy the requirements of high heat resistance. The effect of moisture content is great.
- the water concentration in the electrolytic solution is preferably 1% by weight / 0 or less, and preferably 0 in consideration of the above-mentioned chemical conversion. 0.1 to 1% by weight, particularly preferably 0.01 to 0.1% by weight.
- the present invention also provides an electrolytic capacitor using the electrolytic solution according to the present invention.
- the electrolytic capacitor include an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, and a niobium electrolytic capacitor.
- a foil obtained by forming a thin film of titanium nitride on the surface of an etched aluminum foil (for example, described in JP-A-9-186054) may be used.
- an aluminum foil with a thickness of 120 ⁇ and a purity of 99.9% is expanded by electrolytic etching, followed by anodizing at a formation voltage of 16 OV to form a dielectric made of aluminum oxide on the surface. And cut to 190 mm x 13.5 mm.
- a separator 3 is placed between the anode foil 1 and the cathode foil 2 where the tab terminal to which the lead wire 4 (soldering wire) is welded is attached by crimping method, and the capacitor is wound. It was fixed with an adhesive tape for stopping.
- the specifications of this capacitor element are a rated voltage of 100 V and a rated capacitance of 55 ⁇ F.
- the amount of water contained in the dehydrated electrolytic solution was measured by a Karl Fischer moisture meter and found to be 10 ppm.
- the capacitor element was placed in a glass sealed container to which a vacuum line was connected, the inside of the container was decompressed to about 100 Pa, dried at 125 for 1 hour, and allowed to cool with the glass sealed container.
- electrolytic solution is impregnated into the capacitor element with a vacuum, and it is introduced into a 10-bar X 2 OmmL outer case (bottomed cylindrical aluminum case) 6 shown in Fig. 2. Then, a sealing logo 5 made of peroxide rubber vulcanized with rubber was inserted, and after caulking, a conversion treatment was performed by applying a voltage of 100 V at 125 ° C for 1 hour to produce an aluminum electrolytic capacitor. did.
- the aluminum electrolytic capacitor was placed in an argon glove box with a dew point of 80 ° C, in which the capacitor was disassembled and the electrolyte was collected from the capacitor element.
- the concentration of water in the electrolyte was measured by a Karl Fischer moisture meter.
- the aluminum electrolytic capacitor was left in a thermostat at 125 ° C for 50 hours. After cooling, the capacitor was disassembled, the cathode foil was taken out, washed with distilled water and acetone, dried, and then sputtered with Ar ions at 2 kV for 2 minutes, and the surface was subjected to XPS analysis. .
- the X-ray photoelectron spectrometer used was E S CA5 700 Ci manufactured by PHI, A 1-Koi as the X-ray source, and the measurement area was 800 zm in diameter.
- the electrical conductivity at 25 ° C of the electrolyte used for assembling the capacitor was measured.
- the leakage current (binary value) when a low voltage of 100 V was applied at room temperature was measured. Perform a no-load test for 100 hours at a temperature of 125 ° C, measure the capacitance at 120 Hz before and after the test, and measure the equivalent series resistance (ESR) at 100 kHz, such as blistering and liquid leakage. was observed. Table 1 summarizes the results.
- An aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the capacitor element was dried under normal pressure, and the cooling of the capacitor element and the manufacture of the aluminum electrolytic capacitor were performed in an atmosphere at a relative humidity of 40%. An evaluation was performed. Table 11 summarizes the results.
- the aluminum electrolytic capacitor of the present invention can be used stably for a long period of time while maintaining advantages such as impedance characteristics 14, thermal stability, and withstand voltage.
- an aluminum foil with a thickness of 120 Vm and a purity of 99.9% is expanded by electrolytic etching, and then oxidized on the surface by anodizing at a formation voltage of 16 OV in an aqueous solution of ammonium adipate.
- An aluminum-made dielectric was cut into a piece of 190 mm ⁇ 13.5 mm and used.
- a thickness of 30 / m and a purity of 99.9% which has been expanded by electrolytic etching and cut into 200 mm x 13.5 mm.
- the electrolyte used was 25 parts by weight of dried 1-ethyl-1,2,3-dimethylimidazolidinum salt of tetrafluoroaluminic acid dissolved in 75 parts by weight of low-moisture grade ⁇ -butyrolactone. Using. The amount of water contained in the electrolytic solution was measured by a Karl Fischer moisture meter and found to be 1000 ppm.
- the obtained capacitor was evaluated in the same manner as in Example 1. The results are summarized in Table 2 and Figure 3. As is clear from FIG. 3, the peak top of A12p was 74.9 eV.
- Example 2 An aluminum alloy was prepared in the same manner as in Example 3, except that water was added to the electrolyte used in Example 3 to reduce the water content to 3% by weight, and the capacitor element was used without drying. An electrolytic capacitor was manufactured (manufactured at an atmosphere humidity of 70% for capacitor assembly). The obtained capacitor was evaluated in the same manner as in Example 1. The results are summarized in Table 2 and Figure 3. As apparent from FIG. 3, the peak top of A12p was 76. O eV. Table 2
- An aluminum electrolytic capacitor was manufactured in the same manner as in Example 3, except that the electrolytic solution used in Comparative Example 2 was the same as the electrolytic solution used in Comparative Example 2 except that 1 part by weight of ⁇ -ditobenzoic acid was added. .
- the obtained aluminum electrolytic capacitor was subjected to the heat treatment and the XPS analysis of the cathode in the same manner as in Example 1. As a result, the peak top of A12p was 74.9 eV.
- Example 3 Same as Example 3 except that the electrolytic solution used in Comparative Example 2 was used as the electrolytic solution, and the aluminum foil that had been anodized at a formation voltage of 5 V in an aqueous solution of ammonium adipate was used as the cathode foil. To produce an aluminum electrolytic capacitor.
- Example 6 Comparative Examples 3 to 5
- This tetraethylaluminate of 1,2-dimethylimidazolium was dissolved in y-butyrolactone to prepare a 25% concentration electrolytic solution.
- the electrical conductivity was 24.OmS // cm at 25 ° C.
- the amount of water contained in the electrolyte is
- a CE04 type aluminum electrolytic capacitor with a rated voltage of 100 V and a case size of 10 ⁇ X20 L was fabricated using this 25% solution of ⁇ -butyrolactone in tetrafurenoleuroaluminate of 1-ethyl-1,2,3-dimethylimidazolyuium. did.
- the capacitor element is anodized with an aluminum oxide dielectric film formed on the surface by anodizing the etched aluminum foil as an anode, the etched aluminum foil as a cathode, and manila paper as a separator. What was used was used.
- the electrolytic solution was vacuum impregnated, and this was crimped together with a cylindrical aluminum case and a sealing material made of butyl rubber. Finally, the anodic oxide film was repaired by aging under high temperature and high pressure higher than the usage conditions, and an aluminum electrolytic capacitor was fabricated. A DC voltage of 100 V was applied to this capacitor at 25 ° C, and the value of the leakage current after 2 minutes was measured to be 1.2 wA. ⁇
- An electrolytic solution was prepared in the same manner as in Example 1 except that the tetrafluoroaluminate of 1-ethyl-2,3-dimethylimidazolinium was dried and used without recrystallization in Example 6.
- the conductivity of the electrolyte is 22.8 m at 25
- the electrolytic solution prepared in Example 6 N- (2-E chill-aminoethyl) Single N- Mechiruaseto amide 0.8 wt 0/0 0.2% by weight of N-ethyl-1N- (2-methylaminoethyl) acetamide was added.
- the electric conductivity of this electrolyzed solution was 23.8 mSZcm at 25 ° C.
- the amount of water contained in the electrolyte was 0.1% by weight.
- an aluminum electrolytic capacitor was produced in the same manner as in Example 6, and the value of the leakage current was measured to be 1.6 ⁇ A.
- a PFA round bottom flask was charged with 17.06 g (0.40 mol) of hydrofluoric acid (46.9% by weight aqueous solution), and aluminum hydroxide (purity of 95.2% by weight) was placed in an ice bath in the reactor. 0/0) 8. 19 g of (0.100 mol) was added dropwise over 1 5 minutes a suspension was suspended in water 23. 40 g. After stirring at room temperature for another 30 minutes, 58.99 g (0.105 mol) of a solution of 1-ethyl-1,2,3-dimethylimidazolyum methyl carbonate in methanol and dimethyl carbonate (1.ySmolZKg) was added. The mixture was added dropwise and further stirred at 60 ° C for 1 hour.
- the reaction mixture was filtered, and the solids were separated by filtration.
- the solvent was distilled off, and the residue was crystallized from n-butanol to give 1-ethyl-2,3-dimethylimidazolidinum tetrafluoroaluminate white. Crystals were obtained.
- the yield was 22.0 g, and the total yield from the preparation was 96%.
- the tetrafluoroanoleminate of 1,1-dimethylimidazolinium was dissolved in ⁇ -petit mouth lactone to prepare a 25% concentration electrolytic solution.
- the electrical conductivity at 25 was 24.3 mS / cm.
- it was dissolved in y-butyrolactone to prepare a 40% concentration electrolytic solution.
- the electrical conductivity of this electrolyte at 25 ° C. was 29. OmSZ cm.
- the amount of water contained in the electrolyte was 1,600 ppm.
- a CE 04 type aluminum electrolytic capacitor with a rated voltage of 100 V and a case size of 10 ⁇ X 20 L was prepared.
- the capacitor element is anodized by etching an aluminum foil that has been etched, so that a dielectric coating made of aluminum oxide is formed on the surface of the capacitor element as an anode, the etched aluminum foil as a cathode, and manila paper as a separator. The thing which wound these was used.
- the mixture was stirred at 60 ° C for 1 hour.
- the reaction mixture was filtered, and the solids were filtered off.
- the solvent was distilled off, and the residue was crystallized from n-butanol to form white crystals of tetrafluoroaluminate of 1-ethyl-2,3-dimethylimidazolyum. Obtained.
- the yield was 18.2 g, and the total yield from the preparation was 79%.
- a glass round-bottomed flask was charged with 56.5 g (l O Ommol) of a solution of methyl carbonate of 1-ethyl-1,2,3-dimethylimidazolyum in methanol-dimethyl carbonate (1.77 mol / kg).
- Ammonium chloride 3.70 g (100 mm o 1) was charged and stirred at 50 ° C for 5 hours.
- the reaction mixture was filtered, and 13.80 (lOmmol) of ammonium trifluoride trihydrate was added to the filtrate, and the mixture was stirred at 50 ° C for 3 hours.
- the reaction mixture gelled.
- an electrolytic capacitor of the present invention it is possible to provide an electrolytic capacitor having high electric conductivity, excellent heat stability, withstand voltage characteristics, and low leakage current.
- the present invention is used for electrochemical devices such as batteries and electrolytic capacitors. It is possible to synthesize an organic tetrafluoroaluminate useful as various chemicals including an electrolyte to be produced with a high yield.
Abstract
Description
Claims
Priority Applications (5)
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AU2003280692A AU2003280692A1 (en) | 2002-10-31 | 2003-10-31 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
US10/533,234 US7227738B2 (en) | 2002-10-31 | 2003-10-31 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
EP03770097A EP1564768A4 (en) | 2002-10-31 | 2003-10-31 | ELECTROLYTE FOR ELECTROLYTIC CAPACITOR, ELECTROLYTIC CAPACITOR, AND PROCESS FOR PRODUCING ORGANIC ONIUM TETRAFLUOROALUMINATE |
US11/733,838 US7397651B2 (en) | 2002-10-31 | 2007-04-11 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
US11/733,936 US7295424B2 (en) | 2002-10-31 | 2007-04-11 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
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JP2002317860A JP4366917B2 (ja) | 2002-10-31 | 2002-10-31 | アルミニウム電解コンデンサ |
JP2002-317860 | 2002-10-31 | ||
JP2002-322707 | 2002-11-06 | ||
JP2002322707 | 2002-11-06 | ||
JP2002324179A JP4307820B2 (ja) | 2002-11-07 | 2002-11-07 | アルミニウム電解コンデンサ |
JP2002-324179 | 2002-11-07 | ||
JP2002325707A JP4889181B2 (ja) | 2002-11-08 | 2002-11-08 | 電解コンデンサ用電解液及びこれを用いた電解コンデンサ |
JP2002-325707 | 2002-11-08 | ||
JP2003056995A JP4360106B2 (ja) | 2002-11-06 | 2003-03-04 | 有機オニウムのテトラフルオロアルミン酸塩の製造方法、電解コンデンサ用電解液及びそれを用いた電解コンデンサ |
JP2003-56995 | 2003-03-04 |
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US11/733,936 Division US7295424B2 (en) | 2002-10-31 | 2007-04-11 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
US11/733,838 Division US7397651B2 (en) | 2002-10-31 | 2007-04-11 | Electrolyte for electrolytic capacitor, electrolytic capacitor and process for producing tetrafluoroaluminate salt of organic onium |
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2003
- 2003-10-31 US US10/533,234 patent/US7227738B2/en not_active Expired - Lifetime
- 2003-10-31 WO PCT/JP2003/014014 patent/WO2004040605A1/ja active Application Filing
- 2003-10-31 AU AU2003280692A patent/AU2003280692A1/en not_active Abandoned
- 2003-10-31 EP EP03770097A patent/EP1564768A4/en not_active Withdrawn
- 2003-10-31 EP EP11151369A patent/EP2323145A1/en not_active Withdrawn
- 2003-10-31 EP EP11151370A patent/EP2323144A1/en not_active Withdrawn
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2007
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- 2007-04-11 US US11/733,838 patent/US7397651B2/en not_active Expired - Lifetime
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8007680B2 (en) * | 2005-09-29 | 2011-08-30 | Sanyo Chemical Industries, Ltd. | Electrolyte solution for electrochemical device and electrochemical device using same |
US7998360B2 (en) * | 2005-09-30 | 2011-08-16 | Mitsubishi Chemical Corporation | Electrolysis solution for electrolytic capacitor, and electrolytic capacitor |
CN113745007A (zh) * | 2021-08-24 | 2021-12-03 | 西安交通大学 | 一种钽电解电容器阳极箔的电化学腐蚀扩容工艺 |
Also Published As
Publication number | Publication date |
---|---|
US20070188979A1 (en) | 2007-08-16 |
US20070188977A1 (en) | 2007-08-16 |
US7227738B2 (en) | 2007-06-05 |
AU2003280692A1 (en) | 2004-05-25 |
EP1564768A4 (en) | 2006-04-12 |
EP1564768A1 (en) | 2005-08-17 |
US20060007629A1 (en) | 2006-01-12 |
US7397651B2 (en) | 2008-07-08 |
EP2323144A1 (en) | 2011-05-18 |
US7295424B2 (en) | 2007-11-13 |
EP2323145A1 (en) | 2011-05-18 |
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