CN115410827A - Solid electrolyte electrolytic capacitor - Google Patents
Solid electrolyte electrolytic capacitor Download PDFInfo
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- CN115410827A CN115410827A CN202110595169.6A CN202110595169A CN115410827A CN 115410827 A CN115410827 A CN 115410827A CN 202110595169 A CN202110595169 A CN 202110595169A CN 115410827 A CN115410827 A CN 115410827A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 62
- 239000007784 solid electrolyte Substances 0.000 title claims abstract description 17
- 239000003792 electrolyte Substances 0.000 claims abstract description 73
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 67
- 239000000178 monomer Substances 0.000 claims abstract description 14
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims abstract description 4
- 239000000654 additive Substances 0.000 claims description 30
- 230000000996 additive effect Effects 0.000 claims description 30
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical class [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 13
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 12
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 claims description 7
- 229940092714 benzenesulfonic acid Drugs 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- -1 sulfonic acid anion Chemical class 0.000 claims description 4
- MIOPJNTWMNEORI-GMSGAONNSA-N (S)-camphorsulfonic acid Chemical compound C1C[C@@]2(CS(O)(=O)=O)C(=O)C[C@@H]1C2(C)C MIOPJNTWMNEORI-GMSGAONNSA-N 0.000 claims description 3
- LDMOEFOXLIZJOW-UHFFFAOYSA-N 1-dodecanesulfonic acid Chemical compound CCCCCCCCCCCCS(O)(=O)=O LDMOEFOXLIZJOW-UHFFFAOYSA-N 0.000 claims description 3
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052735 hafnium Inorganic materials 0.000 claims description 3
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 239000010955 niobium Substances 0.000 claims description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 abstract 1
- 239000011888 foil Substances 0.000 description 16
- 230000015556 catabolic process Effects 0.000 description 15
- 239000000203 mixture Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- FYMCOOOLDFPFPN-UHFFFAOYSA-K iron(3+);4-methylbenzenesulfonate Chemical compound [Fe+3].CC1=CC=C(S([O-])(=O)=O)C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1 FYMCOOOLDFPFPN-UHFFFAOYSA-K 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 description 2
- 229940077388 benzenesulfonate Drugs 0.000 description 2
- FDOCOSUCHDHMCW-UHFFFAOYSA-K benzenesulfonate iron(3+) Chemical compound [Fe+3].[O-]S(=O)(=O)c1ccccc1.[O-]S(=O)(=O)c1ccccc1.[O-]S(=O)(=O)c1ccccc1 FDOCOSUCHDHMCW-UHFFFAOYSA-K 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- GGHPFIYIFKEQCM-UHFFFAOYSA-L iron(2+);naphthalene-1-sulfonate Chemical compound [Fe+2].C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1.C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 GGHPFIYIFKEQCM-UHFFFAOYSA-L 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002322 conducting polymer Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WHRAZOIDGKIQEA-UHFFFAOYSA-L iron(2+);4-methylbenzenesulfonate Chemical compound [Fe+2].CC1=CC=C(S([O-])(=O)=O)C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1 WHRAZOIDGKIQEA-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
- H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
Abstract
In order to overcome the defect of poor voltage resistance of the existing solid electrolyte, the invention provides a solid electrolyte electrolytic capacitor, which comprises an anode, a cathode, an isolation layer and an electrolyte; the electrolyte includes a conductive polymer; the conductive polymer comprises a first repeating unit having the following general monomer structure:
Description
Technical Field
The invention relates to the field of electrolytic capacitors, in particular to a solid electrolyte electrolytic capacitor.
Background
As one of the most common electronic components, capacitors are widely used in various electronic products. The solid electrolytic capacitor is a new capacitor developed from the liquid electrolytic capacitor. Compared with electrolyte, the solid electrolyte has the advantages of high conductivity, difficult volatilization at high temperature, nonflammability, good stability at high and low temperatures and the like. Therefore, the solid electrolytic capacitor has advantages of low equivalent series resistance, long service life, high upper limit of operating temperature, good high and low temperature characteristics, and the like. And through research and development for many years, poly (3, 4-ethylenedioxythiophene) (PEDOT) is the mainstream electrolyte of the current solid electrolyte electrolytic capacitor due to the excellent characteristics of high conductivity and the like.
Compared with a liquid electrolytic capacitor, the solid electrolytic capacitor is easy to have a breakdown failure phenomenon in work due to the lack of the capability of oxidizing and repairing the dielectric layer of the electrolyte, so that the breakdown voltage of the solid electrolytic capacitor is an important parameter for measuring the reliability of the capacitor. The breakdown voltage of a capacitor is generally strongly dependent on the materials used in the preparation of the capacitor, such as the voltage resistance of the positive electrode material (anode foil), the insulating properties of the separator, and the voltage resistance of the solid electrolyte. However, in order to obtain a higher breakdown voltage, it is often disadvantageous to miniaturize the capacitor size by increasing the withstand voltage of the anode foil, and is also uneconomical; and the improvement of the insulation of the diaphragm can greatly increase the equivalent series resistance of the capacitor, so that the two methods are rarely used in practical production.
The prepared capacitor can be used for evaluating the voltage-resistant capability of the electrolyte by using a conversion coefficient (the ratio of the voltage-resistant voltage of the anode foil to the breakdown voltage of the capacitor), and when the conversion coefficient is less than 1.5, the electrolyte voltage-resistant capability is relatively excellent. The PEDOT doped sulfonic acid compound group is used as the electrolyte in the prior art, and is often only suitable for capacitors prepared by anode foil with the withstand voltage of less than 30V, so that the provision of the electrolyte with excellent withstand voltage capability and higher withstand voltage of the anode foil is extremely important.
Disclosure of Invention
The invention aims at the defect of poor voltage resistance of the solid electrolyte in the prior art, and provides an electrolyte suitable for an anode foil with the voltage resistance of 32-85V (inclusive) and a solid electrolyte electrolytic capacitor with high working voltage and low equivalent series resistance.
The purpose of the invention is realized by the following technical scheme: a solid electrolyte electrolytic capacitor includes an anode, a cathode, a separator and an electrolyte; the electrolyte includes a conductive polymer; the conductive polymer comprises a first repeating unit having the following general monomer structure:
wherein R is C1-C4 alkyl;
the mole proportion of the first repeating unit is greater than or equal to 28% based on the total mole number of the conductive polymer as 100%;
the voltage resistance of the anode is 32V-85V.
Optionally, the conductive polymer further comprises a second repeating unit having the following general monomer structure:
optionally, the molar ratio of the first repeating unit is greater than or equal to 28%, based on 100% of the total molar number of the first repeating unit and the second repeating unit.
Optionally, the molar ratio of the first repeating unit is greater than or equal to 45%, based on 100% of the total molar number of the first repeating unit and the second repeating unit.
Optionally, the electrolyte further comprises an additive, and the additive is selected from at least one of sulfonic acid anion compounds.
Optionally, the additive is selected from at least one of p-toluenesulfonic acid, dodecylsulfonic acid, naphthalenesulfonic acid, camphorsulfonic acid, styrenesulfonic acid, benzenesulfonic acid, and iron and ferrous salts thereof.
Optionally, the mass of the conductive polymer is 20% to 40% based on 100% of the total mass of the electrolyte.
Optionally, the mass of the conductive polymer is 25 to 35% based on 100% of the total mass of the electrolyte.
Optionally, the anode is made of a valve metal selected from at least one of aluminum, tantalum, titanium, niobium, zirconium, hafnium, vanadium, molybdenum, and tungsten.
Compared with the prior art, the electrolyte has excellent voltage resistance by adding the first repeating unit with the content of more than or equal to 28%, and simultaneously combines with the anode foil with the voltage resistance of 32V-85V, so that the prepared electrolytic capacitor has higher breakdown voltage and low equivalent series resistance.
Detailed Description
The present invention will be described in further detail with reference to examples, but the method of carrying out the present invention is not limited thereto.
The embodiment discloses a solid electrolyte electrolytic capacitor, which comprises an anode, a cathode, an isolating layer and an electrolyte; the electrolyte includes a conductive polymer; the conductive polymer comprises a first repeating unit having the following general monomer structure:
wherein R is C1-C4 alkyl;
the molar proportion of the first repeating unit is greater than or equal to 28 percent based on the total molar number of the conductive polymer as 100 percent;
the voltage resistance of the anode is 32V-85V.
The solid electrolytic capacitor has the advantages that the conducting polymer in the electrolyte contains the first repeating unit with the mole number of more than or equal to 28%, the voltage resistance of the electrolyte is excellent, meanwhile, the prepared electrolytic capacitor has higher breakdown voltage by combining with the anode foil with the withstand voltage of 32V-85V, the conversion coefficient (the ratio of the withstand voltage of the anode foil to the breakdown voltage of the capacitor) is less than 1.5, and meanwhile, the capacitor has lower equivalent series resistance.
In some embodiments, the conductive polymer further comprises a second repeat unit having the following general monomer structure:
in some embodiments, in order to obtain a smaller equivalent series resistance of the electrolytic capacitor, the conductive polymer is preferably composed of the first repeating unit and the second repeating unit. The second repeating unit has no side chain group, and the molecular chain of the conductive polymer contained in the second repeating unit is more regular and is beneficial to electron transmission, so that the conductive polymer formed by the second repeating unit has higher conductivity and can obtain smaller equivalent series resistance.
In some embodiments, the molar ratio of the first repeating unit is greater than or equal to 28% based on 100% of the total molar number of the first repeating unit and the second repeating unit, and when the ratio of the first repeating unit is less than 28%, the electrolyte withstand voltage cannot be applied to a capacitor having an anode foil withstand voltage of 32 to 85V.
In a more preferred embodiment, the mole fraction of the first recurring unit is greater than or equal to 45%, based on 100% total moles of the first recurring unit and the second recurring unit.
In some embodiments, the electrolyte further comprises an additive selected from at least one of sulfonic acid anion-based compounds. The additive may improve the conductivity of the conductive polymer.
In some embodiments, the additive is selected from at least one of p-toluenesulfonic acid, dodecylsulfonic acid, naphthalenesulfonic acid, camphorsulfonic acid, styrenesulfonic acid, benzenesulfonic acid, and its ferric and ferrous salts.
In some embodiments, the conductive polymer is present in a proportion of 20% to 40% by mass, based on 100% by mass of the total electrolyte.
The relationship between the conductivity of the electrolyte and the content of the additive varies as a function of the parabolic shape, and when the content of the additive is too low or too high, the conductivity of the electrolyte is reduced. Therefore, the electrolyte according to the present invention includes a conductive polymer composed of the first repeating unit and the second repeating unit in an amount of 20 to 40% by mass of the electrolyte.
Preferably, in some embodiments, the conductive polymer is 25 to 35% by mass.
In some embodiments, the anode is comprised of a valve metal selected from at least one of aluminum, tantalum, titanium, niobium, zirconium, hafnium, vanadium, molybdenum, tungsten.
The valve metal is subjected to porous treatment before anodic oxidation to enlarge the specific surface area of the valve metal, so that the valve metal can be adsorbed in a reaction solution for polymerization reaction.
The present invention is further illustrated by the following examples.
Example 1
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode voltage resistance is 32V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit and a second repeating unit, R in a monomer structural general formula of the first repeating unit is a methyl group, the molar ratio of the first repeating unit in the conductive polymer is 50%, the conductive polymer accounts for 30% of the mass fraction of the electrolyte, and the additive is a mixture of ferric p-toluenesulfonate and ferrous p-toluenesulfonate.
Example 2
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode withstand voltage is 45V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit and a second repeating unit, R in a monomer structural general formula of the first repeating unit is an ethyl group, the molar ratio of the first repeating unit in the conductive polymer is 35%, the conductive polymer accounts for 40% of the mass fraction of the electrolyte, and the additive is a mixture of ferric p-toluenesulfonate and ferrous p-toluenesulfonate.
Example 3
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode voltage resistance is 45V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit, R in a monomer structural general formula of the first repeating unit is a propyl group, the molar ratio of the first repeating unit in the conductive polymer is 80%, the conductive polymer accounts for 35% of the mass fraction of the electrolyte, and the additive is a mixture of iron p-toluenesulfonate and ferrous p-toluenesulfonate.
Example 4
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode withstand voltage is 51V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit and a second repeating unit, R in a monomer structural general formula of the first repeating unit is an ethyl group, the molar ratio of the first repeating unit in the conductive polymer is 50%, the conductive polymer accounts for 30% of the mass fraction of an electrolyte, and an additive is a mixture of ferric p-toluenesulfonate and ferrous p-toluenesulfonate.
Example 5
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode voltage resistance is 51V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer consists of a first repeating unit and a second repeating unit, wherein R in a monomer structural general formula of the first repeating unit is an ethyl group, the molar ratio of the first repeating unit in the conductive polymer is 28%, the conductive polymer accounts for 25% of the mass fraction of the electrolyte, and the additive is a mixture of iron naphthalenesulfonate, ferrous naphthalenesulfonate and benzenesulfonic acid.
Example 6
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode voltage resistance is 65V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit and a second repeating unit, R in a monomer structural general formula of the first repeating unit is an ethyl group, the molar ratio of the first repeating unit in the conductive polymer is 100%, the conductive polymer accounts for 35% of the mass fraction of the electrolyte, and the additive is a mixture of ferric p-toluenesulfonate and ferrous p-toluenesulfonate.
Example 7
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode withstand voltage is 85V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit, R in a monomer structural general formula of the first repeating unit is a butyl group, the molar ratio of the first repeating unit in the conductive polymer is 45%, the conductive polymer accounts for 35% of the mass fraction of the electrolyte, and the additive is a mixture of ferric benzene sulfonate, ferrous benzene sulfonate and benzene sulfonic acid.
Example 8
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode withstand voltage is 51V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit and a second repeating unit, R in a monomer structural general formula of the first repeating unit is a methyl group, the molar ratio of the first repeating unit in the conductive polymer is 50%, the conductive polymer accounts for 27% of the mass fraction of the electrolyte, and the additive is a mixture of iron naphthalenesulfonate, ferrous naphthalenesulfonate and benzenesulfonic acid.
Comparative example 1
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode voltage resistance is 51V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer consists of a second repeating unit, the conductive polymer accounts for 35% of the mass of the electrolyte, and the additive is a mixture of ferric p-toluenesulfonate and ferrous p-toluenesulfonate.
Comparative example 2
A solid-state aluminum electrolytic capacitor comprises an anode, a cathode, an isolating layer and an electrolyte, wherein the isolating layer and the electrolyte are positioned between the anode and the cathode, the anode withstand voltage is 24V, and the electrolyte consists of a conductive polymer and an additive; the conductive polymer is composed of a first repeating unit, R in the first repeating unit is a butyl group, the conductive polymer accounts for 35% of the mass of the electrolyte, and the additive is a mixture of ferric benzene sulfonate, ferrous benzene sulfonate and benzene sulfonic acid.
The above examples and comparative examples were designed to have a capacity of 100 microfarads, and the capacity, loss tangent, equivalent series resistance, leakage current, breakdown voltage, and the like of the capacitor were tested to compare the differences in the performance.
The experimental data of the above examples and comparative examples are filled in table 1:
TABLE 1
And (4) performance testing:
the test equipment can adopt a Changzhou homologous TH2829C model automatic element analyzer to test the following electrical property parameters:
cap: capacity (120 Hz frequency)
DF loss tangent (120 Hz frequency)
ESR equivalent series resistance (100 KHz frequency)
Breakdown voltage: the capacitor is connected with a direct current power supply, the voltage is boosted until the capacitor breaks down, and the highest voltage is the breakdown voltage.
The capacitors of the above examples and comparative examples were subjected to relevant performance tests, and the data are shown in table 2:
TABLE 2
The conductive polymers of the capacitors of examples 1-8 each contained 28% or more of the first repeating units in terms of molar ratio, while the anode foil withstand voltage was in the range of 32 to 85V, and the data in Table 1 show that the capacitors of examples 1-8 each had a ratio of the anode foil withstand voltage to the breakdown voltage of less than 1.5, indicating that the electrolytic capacitors had a higher withstand voltage; while the ESR was measured to be within an acceptable range (less than 25m Ω).
While comparative example 1, in which the first repeating unit was not added, had a breakdown voltage of only 19V, which was much lower than those of examples 1 to 8, and the anode foil of comparative example 1 had a ratio of the withstand voltage to the breakdown voltage of 2.68, which was much greater than 1.5, indicating that the solid electrolyte of the first repeating unit can be suitably used for an anode foil having a withstand voltage of 32 to 85V, thereby improving the withstand voltage capability of the electrolytic capacitor.
In contrast, comparative example 2, in which the anode foil has a withstand voltage of only 24V, has a breakdown voltage that is difficult to increase and an equivalent series resistance that is significantly too large even when 100% of the first repeating unit is added, shows that the use of the solid electrolyte including the first repeating unit in combination with the anode foil having a withstand voltage of 32 to 85V in the present application can significantly improve the withstand voltage capability of the electrolytic capacitor, reduce the equivalent series resistance, and widen the use range of the solid electrolyte.
From the results of the above examples and comparative examples, it can be seen that the solid electrolytic capacitor with high operating voltage and low equivalent series resistance can be obtained by the manufacturing method described in the present invention, and has high practical value.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A solid electrolyte electrolytic capacitor comprising an anode, a cathode, a separator and an electrolyte; the electrolyte includes a conductive polymer; the conductive polymer comprises a first repeat unit having the following general monomer structure:
wherein R is C1-C4 alkyl;
the molar proportion of the first repeating unit is greater than or equal to 28 percent based on the total molar number of the conductive polymer as 100 percent;
the voltage resistance of the anode is 32V-85V.
2. A solid state electrolyte as claimed in claim 1An electrolytic capacitor, wherein said conductive polymer further comprises a second repeat unit having the general monomeric structure:
3. the solid electrolytic capacitor as claimed in claim 1 or 2, wherein the molar ratio of the first repeating unit is 28% or more based on 100% of the total molar number of the first repeating unit and the second repeating unit.
4. The solid electrolytic capacitor as claimed in claim 3, wherein the molar ratio of the first repeating unit is 45% or more based on 100% of the total molar amount of the first repeating unit and the second repeating unit.
5. The solid electrolytic capacitor as claimed in claim 1, wherein the electrolyte further comprises an additive selected from at least one of sulfonic acid anion-based compounds.
6. The solid electrolytic capacitor as claimed in claim 5, wherein the additive is at least one selected from the group consisting of p-toluenesulfonic acid, dodecylsulfonic acid, naphthalenesulfonic acid, camphorsulfonic acid, styrenesulfonic acid, benzenesulfonic acid, and iron and ferrous salts thereof.
7. The solid electrolytic capacitor as claimed in claim 1, wherein the conductive polymer is present in a proportion of 20 to 40% by mass based on 100% by mass of the total mass of the electrolyte.
8. The solid electrolytic capacitor as claimed in claim 7, wherein the conductive polymer is present in an amount of 25 to 35% by mass based on 100% by mass of the total mass of the electrolyte.
9. A solid electrolyte electrolytic capacitor as claimed in claim 1, wherein the anode is composed of a valve metal selected from at least one of aluminum, tantalum, titanium, niobium, zirconium, hafnium, vanadium, molybdenum, tungsten.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110595169.6A CN115410827A (en) | 2021-05-28 | 2021-05-28 | Solid electrolyte electrolytic capacitor |
| PCT/CN2022/092114 WO2022247632A1 (en) | 2021-05-28 | 2022-05-11 | Solid electrolyte electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110595169.6A CN115410827A (en) | 2021-05-28 | 2021-05-28 | Solid electrolyte electrolytic capacitor |
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| Publication Number | Publication Date |
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| CN115410827A true CN115410827A (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110595169.6A Pending CN115410827A (en) | 2021-05-28 | 2021-05-28 | Solid electrolyte electrolytic capacitor |
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| Country | Link |
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| CN (1) | CN115410827A (en) |
| WO (1) | WO2022247632A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4925144B2 (en) * | 2009-06-30 | 2012-04-25 | 日本カーリット株式会社 | Manufacturing method of solid electrolytic capacitor |
| JP2011258808A (en) * | 2010-06-10 | 2011-12-22 | Japan Carlit Co Ltd | Method of manufacturing solid electrolytic capacitor |
| US9589738B2 (en) * | 2011-12-19 | 2017-03-07 | Tayca Corporation | Solid electrolyte capacitor and a method for manufacturing the same |
| CN105793939B (en) * | 2014-01-16 | 2018-09-28 | 松下知识产权经营株式会社 | electrolytic capacitor and its manufacturing method |
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- 2021-05-28 CN CN202110595169.6A patent/CN115410827A/en active Pending
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| WO2022247632A1 (en) | 2022-12-01 |
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