CN112582181B - Electrolyte for low-voltage aluminum electrolytic capacitor with high hydration resistance and preparation method - Google Patents
Electrolyte for low-voltage aluminum electrolytic capacitor with high hydration resistance and preparation method Download PDFInfo
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- CN112582181B CN112582181B CN202011250103.5A CN202011250103A CN112582181B CN 112582181 B CN112582181 B CN 112582181B CN 202011250103 A CN202011250103 A CN 202011250103A CN 112582181 B CN112582181 B CN 112582181B
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 107
- 239000003990 capacitor Substances 0.000 title claims abstract description 100
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 72
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 230000036571 hydration Effects 0.000 title claims abstract description 36
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 55
- 230000000996 additive effect Effects 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 33
- 239000011737 fluorine Substances 0.000 claims abstract description 33
- 239000002904 solvent Substances 0.000 claims abstract description 28
- -1 dicarboxylic acid ammonium salt Chemical class 0.000 claims abstract description 16
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 11
- KWIPUXXIFQQMKN-UHFFFAOYSA-N 2-azaniumyl-3-(4-cyanophenyl)propanoate Chemical compound OC(=O)C(N)CC1=CC=C(C#N)C=C1 KWIPUXXIFQQMKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229940090948 ammonium benzoate Drugs 0.000 claims abstract description 10
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 claims abstract description 10
- CKKXWJDFFQPBQL-UAIGNFCESA-N diazanium;(z)-but-2-enedioate Chemical compound [NH4+].[NH4+].[O-]C(=O)\C=C/C([O-])=O CKKXWJDFFQPBQL-UAIGNFCESA-N 0.000 claims abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 53
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 48
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 45
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 36
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 32
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 32
- 239000011259 mixed solution Substances 0.000 claims description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims description 20
- 239000001257 hydrogen Substances 0.000 claims description 20
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 14
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 claims description 12
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 12
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- OTLNPYWUJOZPPA-UHFFFAOYSA-N 4-nitrobenzoic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1 OTLNPYWUJOZPPA-UHFFFAOYSA-N 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 10
- 150000001990 dicarboxylic acid derivatives Chemical class 0.000 claims description 10
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 10
- JKTYGPATCNUWKN-UHFFFAOYSA-N 4-nitrobenzyl alcohol Chemical compound OCC1=CC=C([N+]([O-])=O)C=C1 JKTYGPATCNUWKN-UHFFFAOYSA-N 0.000 claims description 9
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 9
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 9
- 150000003863 ammonium salts Chemical class 0.000 claims description 9
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 9
- BTJIUGUIPKRLHP-UHFFFAOYSA-N 4-nitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1 BTJIUGUIPKRLHP-UHFFFAOYSA-N 0.000 claims description 7
- 238000009835 boiling Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 6
- 239000005725 8-Hydroxyquinoline Substances 0.000 claims description 6
- JDRJCBXXDRYVJC-UHFFFAOYSA-N OP(O)O.N.N.N Chemical compound OP(O)O.N.N.N JDRJCBXXDRYVJC-UHFFFAOYSA-N 0.000 claims description 6
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 claims description 6
- 229960003540 oxyquinoline Drugs 0.000 claims description 6
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 claims description 6
- AMMWFYKTZVIRFN-UHFFFAOYSA-N sodium 3-hydroxy-4-[(1-hydroxynaphthalen-2-yl)diazenyl]-7-nitronaphthalene-1-sulfonic acid Chemical compound [Na+].C1=CC=CC2=C(O)C(N=NC3=C4C=CC(=CC4=C(C=C3O)S(O)(=O)=O)[N+]([O-])=O)=CC=C21 AMMWFYKTZVIRFN-UHFFFAOYSA-N 0.000 claims description 6
- ARKIFHPFTHVKDT-UHFFFAOYSA-N 1-(3-nitrophenyl)ethanone Chemical compound CC(=O)C1=CC=CC([N+]([O-])=O)=C1 ARKIFHPFTHVKDT-UHFFFAOYSA-N 0.000 claims description 5
- UFBJCMHMOXMLKC-UHFFFAOYSA-N 2,4-dinitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O UFBJCMHMOXMLKC-UHFFFAOYSA-N 0.000 claims description 5
- CFBYEGUGFPZCNF-UHFFFAOYSA-N 2-nitroanisole Chemical compound COC1=CC=CC=C1[N+]([O-])=O CFBYEGUGFPZCNF-UHFFFAOYSA-N 0.000 claims description 5
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 5
- CFAHHNGTTHBTNN-UHFFFAOYSA-N [N+](=O)([O-])C1=C(C=CC=C1)[N+](=O)[O-].C1(C=CC(C=C1)=O)=O Chemical compound [N+](=O)([O-])C1=C(C=CC=C1)[N+](=O)[O-].C1(C=CC(C=C1)=O)=O CFAHHNGTTHBTNN-UHFFFAOYSA-N 0.000 claims description 5
- GJYJYFHBOBUTBY-UHFFFAOYSA-N alpha-camphorene Chemical compound CC(C)=CCCC(=C)C1CCC(CCC=C(C)C)=CC1 GJYJYFHBOBUTBY-UHFFFAOYSA-N 0.000 claims description 5
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 5
- 239000005922 Phosphane Substances 0.000 claims description 4
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 claims description 4
- 229910000064 phosphane Inorganic materials 0.000 claims description 4
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 4
- 150000003904 phospholipids Chemical class 0.000 claims description 4
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 2
- 239000002516 radical scavenger Substances 0.000 claims description 2
- 238000004078 waterproofing Methods 0.000 claims 1
- 239000010407 anodic oxide Substances 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 abstract 1
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 14
- 239000001741 Ammonium adipate Substances 0.000 description 14
- 235000019293 ammonium adipate Nutrition 0.000 description 14
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 239000005711 Benzoic acid Substances 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 235000010233 benzoic acid Nutrition 0.000 description 4
- FQMYEKRVNAZKOD-UHFFFAOYSA-N diazanium;2,2,3,3-tetrafluorobutanedioate Chemical compound [NH4+].[NH4+].[O-]C(=O)C(F)(F)C(F)(F)C([O-])=O FQMYEKRVNAZKOD-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- NHJPVZLSLOHJDM-UHFFFAOYSA-N azane;butanedioic acid Chemical compound [NH4+].[NH4+].[O-]C(=O)CCC([O-])=O NHJPVZLSLOHJDM-UHFFFAOYSA-N 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- ZTVZLYBCZNMWCF-UHFFFAOYSA-N homocystine Chemical group [O-]C(=O)C([NH3+])CCSSCCC([NH3+])C([O-])=O ZTVZLYBCZNMWCF-UHFFFAOYSA-N 0.000 description 2
- HEQBUZNAOJCRSL-UHFFFAOYSA-N iron(ii) chromite Chemical compound [O-2].[O-2].[O-2].[Cr+3].[Fe+3] HEQBUZNAOJCRSL-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- YUDUFRYTKFGQCL-UHFFFAOYSA-N 2,2,3,3-tetrafluorobutanedioic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(O)=O YUDUFRYTKFGQCL-UHFFFAOYSA-N 0.000 description 1
- RSEBUVRVKCANEP-UHFFFAOYSA-N 2-pyrroline Chemical compound C1CC=CN1 RSEBUVRVKCANEP-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- ZIYVHBGGAOATLY-UHFFFAOYSA-N methylmalonic acid Chemical compound OC(=O)C(C)C(O)=O ZIYVHBGGAOATLY-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- ZVJHJDDKYZXRJI-UHFFFAOYSA-N pyrroline Natural products C1CC=NC1 ZVJHJDDKYZXRJI-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding 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
- H01G9/145—Liquid electrolytic capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
An electrolyte for a low-voltage aluminum electrolytic capacitor with high hydration resistance and a preparation method thereof, which comprises 5 to 25 percent of main solute, 0.01 to 5 percent of auxiliary solute containing fluorine, 60 to 90 percent of solvent and 0.03 to 15 percent of additive by mass percent. The main solute is one or more of ammonium formate, ammonium benzoate, ammonium maleate, dicarboxylic acid with 4-6 carbon atoms, dicarboxylic acid ammonium salt, branched dicarboxylic acid and branched dicarboxylic acid ammonium salt. The electrolyte can inhibit the generation of the hydrated oxide of the anode under the working voltage of 2-160V; and the oxidation efficiency is high, the repair of the anodic oxide film of the aluminum electrolytic capacitor is facilitated, and the self-healing characteristic of the aluminum electrolytic capacitor can be improved. On the basis of improving the hydration resistance of the anode of the electrolytic capacitor, the electric conductivity of the electrolyte can be improved by introducing water into the electrolyte, and the repairing performance of an anode oxide film of the aluminum electrolytic capacitor is improved, so that the frequency characteristic is improved, and the loss and the leakage current are reduced.
Description
Technical Field
The invention belongs to the field of aluminum electrolytic capacitors, and particularly relates to electrolyte for a low-voltage aluminum electrolytic capacitor with high hydration resistance and a preparation method thereof.
Background
The aluminum electrolytic capacitor is used as a traditional energy storage device, has the functions of rectification, filtering, bypass, coupling, energy storage and the like in a circuit, has the characteristics of large specific capacity per unit volume, high working electric field strength, self-healing characteristic and low price, is widely applied to the fields of household appliances, automotive electronics, industrial control, aerospace, military and the like, and is an indispensable discrete electronic component in the circuit. With the continuous development of the electronic industry, the performance requirements on the aluminum electrolytic capacitor are higher and higher, and the aluminum electrolytic capacitor is promoted to develop towards miniaturization, long service life and the like.
The electrolyte of the conventional low-voltage aluminum electrolytic capacitor has high water content, and during the storage and working processes of the capacitor, the water in the electrolyte can cause the surface of the anode foil to form hydrated oxide. With the increase of the service life of the electrolytic capacitor, the increase of the hydrated oxide on the surface of the anode can lead parameters such as the capacity of the capacitor to be rapidly deteriorated, and finally the capacitor is failed, thus being unable to adapt to the development trend of long service life of the electrolytic capacitor in the future.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide an electrolyte for a low-voltage aluminum electrolytic capacitor with high hydration resistance and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises, by mass, 5-25% of a main solute, 0.01-5% of a fluorine-containing auxiliary solute, 60-90% of a solvent and 0.03-15% of an additive.
In a further improvement of the invention, the main solute is one or more of ammonium formate, ammonium benzoate, ammonium maleate, a dicarboxylic acid having 4 to 6 carbon atoms, an ammonium salt of a dicarboxylic acid, a branched dicarboxylic acid and an ammonium salt of a branched dicarboxylic acid.
The further improvement of the invention is that the fluorine-containing auxiliary solute is one or more of perfluoro dicarboxylic acid with the carbon number of 4-6, ammonium salt of perfluoro dicarboxylic acid, perfluoro dicarboxylic acid with branched chain and ammonium salt of perfluoro dicarboxylic acid with branched chain.
The invention is further improved in that the solvent comprises water and organic matters, and the mass percentage of the water in the electrolyte is 10-70%.
In a further improvement of the invention, the organic material is one or more of ethylene glycol, N-dimethylformamide, gamma-butyrolactone, N-butanol, diethylene glycol, propylene glycol and glycerol.
The invention has the further improvement that the additive comprises a waterproof agent, a hydrogen eliminating agent and an additive, wherein the mass percent of the waterproof agent in the electrolyte is 0.01-10%, the mass percent of the hydrogen eliminating agent in the electrolyte is 0.01-10%, and the mass percent of the additive in the waterproof agent in the electrolyte is 0.01-10%.
The invention is further improved in that the waterproof agent is one or more of phosphoric acid, ammonium dihydrogen phosphate, phosphorous acid, hypophosphorous acid, ammonium phosphite, ammonium hypophosphite, phosphane, phospholipid, phosphotungstic acid and ammonium phosphotungstate.
The invention is further improved in that the hydrogen eliminating agent is one or more of resorcinol, p-nitrobenzoic acid, p-nitrobenzyl alcohol, m-nitroacetophenone, p-nitrophenol, o-nitroanisole, p-benzoquinone dinitrobenzene and dinitrophenol.
The invention has the further improvement that the additive is one or more of triethylamine, triethanolamine, formamide, succinoxime, chrome black T, o-phenanthroline and 8-hydroxyquinoline;
a preparation method of electrolyte for a low-voltage aluminum electrolytic capacitor with high hydration resistance comprises the following steps:
the method comprises the following steps: weighing 5-25% of main solute, 0.01-5% of auxiliary solute containing fluorine, 60-90% of solvent and 0.03-15% of additive according to mass percentage;
step two: adding a main solute and a fluorine-containing auxiliary solute into a solvent at 50-90 ℃, and stirring until the main solute and the fluorine-containing auxiliary solute are uniformly mixed to obtain a mixed solution;
step three: adding the additive into the mixed solution obtained in the second step at 85-90 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step four: and boiling the mixed solution obtained in the third step at 90-120 ℃ for 30-120min, and cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
Compared with the prior art, the invention has the following technical effects:
because the invention adopts the auxiliary solute containing fluorine, the prepared electrolyte can continuously provide the electrochemical capacity for repairing the anode dielectric oxide film of the electrolytic capacitor under the working voltage of 2-160V, has high oxidation efficiency and can improve the self-healing characteristic of the aluminum electrolytic capacitor; in the working process of the electrolyte, the auxiliary solute containing fluorine is attached to the surface of the anode of the capacitor, so that water and other oxygen-containing substances can be prevented from migrating into the auxiliary solute, the generation of anode hydrous oxide can be inhibited, and the inner layer components of the anodic oxide film can be protected.
Furthermore, in the working electrolyte, the additives comprise a waterproof agent, a hydrogen scavenger and an additive. The waterproof agent can also improve the water resistance of the anode, but the waterproof agent is generally phosphoric acid and derivatives thereof, and phosphoric acid solvents have a certain corrosion effect on a medium oxide film on the surface of the anode, so that the performance of the capacitor is reduced. Therefore, the electrolyte can reduce the dosage of the phosphoric acid waterproof agent and reduce the corrosion to the anode dielectric film. The electrolyte in the invention assists the synergistic effect of the solute and the waterproof agent, so that the hydration resistance of the anode of the electrolytic capacitor is greatly enhanced.
Furthermore, in the working electrolyte, the additive is one or more of triethylamine, triethanolamine, formamide, succinoxime, chrome black T, o-phenanthroline and 8-hydroxyquinoline, the pH value of the additive can be adjusted, and a metal complex in the additive can inhibit the formation of alumina precipitates in the electrolyte, so that the electrolyte is protected.
Furthermore, compared with the characteristic that the electrolyte for the conventional low-voltage aluminum electrolytic capacitor contains almost no water, the electrolyte for the low-voltage aluminum electrolytic capacitor disclosed by the invention contains 10-70% of water by mass fraction. Because the electrolyte has stronger hydration resistance, the water in the electrolyte is difficult to cause the anode of the electrolytic capacitor to form hydrated oxide, and the components of the anodic oxide film can not be influenced. The electrolyte contains a certain content of water, so that the conductivity of the electrolyte is improved, and the repairing performance of the capacitor anode can be enhanced by the characteristic, so that the frequency characteristic of the capacitor is improved, the loss and the leakage current as well as the resistance value of the series resistor of the equivalent circuit are reduced, and the quality of the capacitor is improved; the introduction of water into the electrolyte can reduce the consumption of other solvents in the electrolyte and reduce the cost.
Furthermore, the electrolyte in the invention assists the synergistic effect of the solute, the solvent and the additive, and can improve the repair characteristic of the anode of the electrolytic capacitor and enhance the hydration resistance. Compared with the conventional medium and high voltage aluminum electrolytic capacitor, the service life of the medium and high voltage aluminum electrolytic capacitor using the electrolyte can be prolonged by more than 1 time. The introduction of water into the electrolyte can reduce production costs.
Furthermore, the oxidation efficiency is high because the chemical properties of the perfluorinated dicarboxylic acid, the ammonium salt of the perfluorinated dicarboxylic acid, the branched perfluorinated dicarboxylic acid and the branched ammonium salt of the perfluorinated dicarboxylic acid are similar to those of the dicarboxylic acid, the ammonium salt of the dicarboxylic acid, the branched perfluorinated dicarboxylic acid and the branched ammonium salt of the perfluorinated dicarboxylic acid.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the following embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention to be disclosed. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The working voltage of the aluminum electrolytic capacitor suitable for the electrolyte is 2-160V, and the specification of the capacitor is the same as that of a general electrolytic capacitor in the working voltage range.
The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises, by mass, 5-25% of a main solute, 0.01-5% of a fluorine-containing auxiliary solute, 60-90% of a solvent and 0.03-15% of an additive.
Wherein the main solute is one or more of ammonium formate, ammonium benzoate, ammonium maleate, dicarboxylic acid with 4-6 carbon atoms, dicarboxylic acid ammonium salt, branched dicarboxylic acid and branched dicarboxylic acid ammonium salt. Preferably, the main solute is one or more of ammonium adipate, ammonium formate and ammonium benzoate.
The fluorine-containing auxiliary solute is one or more of perfluorinated dicarboxylic acid with the carbon atom number of 4-6, perfluorinated dicarboxylic acid ammonium salt, perfluorinated dicarboxylic acid with a branched chain and perfluorinated dicarboxylic acid ammonium salt with a branched chain.
The solvent comprises water and organic matters, and the mass percent of the water in the electrolyte is 10-70%. The organic matter is one or more of ethylene glycol, N-N-dimethylformamide, gamma-butyrolactone, N-butanol, diethylene glycol, propylene glycol and glycerol.
The additive comprises a waterproof agent, a hydrogen eliminating agent and an additive. The mass percent of the waterproof agent in the electrolyte is 0.01-10%, the mass percent of the hydrogen eliminating agent in the electrolyte is 0.01-10%, and the mass percent of the waterproof agent in the electrolyte is 0.01-10%.
The waterproof agent is one or more of phosphoric acid, ammonium dihydrogen phosphate, phosphorous acid, hypophosphorous acid, ammonium phosphite, ammonium hypophosphite, phosphane, phospholipid, phosphotungstic acid and ammonium phosphotungstate.
The hydrogen eliminating agent is one or more of resorcinol, p-nitrobenzoic acid, p-nitrobenzyl alcohol, m-nitroacetophenone, p-nitrophenol, o-nitroanisole, p-benzoquinone dinitrobenzene and dinitrophenol.
The additive is one or more of triethylamine, triethanolamine, formamide, succinoxime, chrome black T, o-phenanthroline and 8-hydroxyquinoline.
The preparation method of the electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following steps:
the method comprises the following steps: weighing 5-25% of main solute, 0.01-5% of auxiliary solute containing fluorine, 60-90% of solvent and 0.03-15% of additive according to mass percentage;
step two: adding a main solute and a fluorine-containing auxiliary solute into a solvent at 50-90 ℃, stirring until the main solute and the fluorine-containing auxiliary solute are uniformly mixed and all components are completely dissolved to obtain a mixed solution;
step three: adding the additive into the mixed solution obtained in the second step at 85-90 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step four: and (4) boiling the mixed solution obtained in the third step at 90-120 ℃ for 30-120 min. And cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
During the use of an electrolytic capacitor, it is generally considered that when the capacity drops below 80% of the initial capacity, the capacitor fails, i.e., the time taken for the capacity of the capacitor to drop by 20% is the life of the capacitor.
The following are specific examples.
Example 1
The electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following components in percentage by mass: 10% of ammonium adipate, 5% of ammonium octafluoro adipate, 65% of ethylene glycol, 10% of water, 2% of benzoic acid, 2% of phosphoric acid, 2% of p-nitrobenzoic acid, 2% of triethylamine and 2% of diethylene glycol.
Example 2
The electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following components in percentage by mass: 10.99% of ammonium adipate, 0.01% of ammonium octafluoro adipate, 5% of octafluoro adipate, 70% of water, 5% of ammonium benzoate, 5% of phosphoric acid, 1% of p-nitrophenol, 1% of triethylamine, 1% of triethanolamine and 1% of diethylene glycol.
Example 3
The electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following components in percentage by mass: 20% of ammonium adipate, 5% of ammonium maleate, 3% of ammonium octafluoro adipate, 2% of octafluoro adipate, 15% of ethylene glycol, 45% of water, 3% of ammonium formate, 2% of ammonium dihydrogen phosphate, 2% of p-nitrobenzyl alcohol, 1% of butanedioxime, T1% of chrome black and 1% of diethylene glycol.
Example 4
Preparing the electrolyte for the low-voltage aluminum electrolytic capacitor according to the following mass percentages: 10% of ammonium adipate, 5% of ammonium tetrafluorosuccinate, 55% of ethylene glycol, 20% of water, 2% of benzoic acid, 2% of phosphoric acid, 2% of p-nitrobenzoic acid, 2% of triethylamine and 2% of diethylene glycol.
Example 5
Preparing the electrolyte for the low-voltage aluminum electrolytic capacitor according to the following mass percentages: 10.9 percent of ammonium adipate, 0.1 percent of ammonium tetrafluorosuccinate, 5 percent of tetrafluorosuccinic acid, 70 percent of water, 5 percent of ammonium benzoate, 5 percent of phosphoric acid, 1 percent of p-nitrobenzoic acid, 2 percent of triethylamine and 1 percent of triethanolamine.
Example 6
Preparing the electrolyte for the low-voltage aluminum electrolytic capacitor according to the following mass percentages: 15% of ammonium adipate, 1% of ammonium tetrafluorosuccinate, 2% of isotetrafluorosuccinate, 10% of ethylene glycol, 50% of water, 10% of ammonium formate, 2% of ammonium dihydrogen phosphate, 2% of p-nitrobenzyl alcohol, 2% of triethylamine, 2% of triethanolamine, 1% of diethylene glycol and 1% of butanedioxime.
Comparative example 1
The electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following components in percentage by mass: 15% of ammonium adipate, 65% of ethylene glycol, 10% of water, 2% of benzoic acid, 2% of phosphoric acid, 2% of p-nitrobenzoic acid, 2% of triethylamine and 2% of diethylene glycol.
Comparative example 2
The electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following components in percentage by mass: 5% of adipic acid, 11% of ammonium adipate, 70% of water, 5% of ammonium benzoate, 5% of phosphoric acid, 1% of p-nitrophenol, 1% of triethylamine, 1% of triethanolamine and 1% of diethylene glycol.
Comparative example 3
The electrolyte for the low-voltage aluminum electrolytic capacitor comprises the following components in percentage by mass: 23% of ammonium adipate, 5% of ammonium maleate, 2% of adipic acid, 15% of ethylene glycol, 45% of water, 3% of ammonium formate, 2% of ammonium dihydrogen phosphate, 2% of p-nitrobenzyl alcohol, 1% of butanedioxime, T1% of chrome black and 1% of diethylene glycol.
Comparative example 4
Preparing the electrolyte for the low-voltage aluminum electrolytic capacitor according to the following mass percentages: 10% of ammonium adipate, 5% of ammonium succinate, 55% of ethylene glycol, 20% of water, 2% of benzoic acid, 2% of phosphoric acid, 2% of p-nitrobenzoic acid, 2% of triethylamine and 2% of diethylene glycol.
Comparative example 5
Preparing the electrolyte for the low-voltage aluminum electrolytic capacitor according to the following mass percentages: 5% of succinic acid, 0.1% of ammonium succinate, 10.9% of ammonium adipate, 70% of water, 5% of ammonium benzoate, 5% of phosphoric acid, 1% of p-nitrobenzoic acid, 2% of triethylamine and 1% of triethanolamine.
Comparative example 6
Preparing the electrolyte for the low-voltage aluminum electrolytic capacitor according to the following mass percentages: 2% of succinic acid, 1% of ammonium succinate, 2% of ammonium isosuccinate, 15% of ammonium adipate, 10% of ethylene glycol, 50% of water, 10% of ammonium formate, 2% of ammonium dihydrogen phosphate, 2% of p-nitrobenzyl alcohol, 2% of triethylamine, 2% of triethanolamine, 1% of diethylene glycol and 1% of butanedioxime.
The aluminum electrolytic capacitor is manufactured, and the specifications are 6.3V-100 mu F4 mm x 7mm, 100V-220 mu F13 mm x 21mm, 160V-47 mu F13 mm x 21mm, 25V-100 mu F6 mm x 7mm and 50V-100 mu F6 mm x 12 mm. The manufacturing method of the aluminum electrolytic capacitor comprises the following steps:
the method comprises the following steps: putting the cut electrolytic paper into an electrolyte for an electrolytic capacitor (the electrolyte prepared by the embodiment and the comparative example in the invention) for 10-60s to obtain electrolytic paper impregnated with the electrolyte;
step two: winding or folding the electrolytic paper impregnated with the electrolyte, the anode foil and the extraction electrode foil obtained in the step one into a core package;
step three: and (5) putting the core cladding obtained in the step two into a shell and packaging to obtain the electrolytic capacitor.
The electrolytic capacitor samples were subjected to a life load test at 85 ℃, 5 samples were put into each capacitor of examples or comparative examples in each specification test to obtain initial characteristics and life test results of the aluminum electrolytic capacitor, the time required for the capacity change of the capacitor to be 20% was recorded, and after removing abnormal values, the average values were determined, and the results are shown in tables 1 to 5:
TABLE 1 Performance of aluminum electrolytic capacitor with specification of 6.3V-100 μ F4 mm x 7mm
TABLE 2 Performance of aluminum electrolytic capacitor with specification of 100V-220 μ F13 mm x 21mm
TABLE 3 Performance of 160V-47 μ F13 mm by 21mm aluminum electrolytic capacitor
TABLE 4 Performance of 25V-100 μ F6 mm by 7mm aluminum electrolytic capacitor
TABLE 5 Performance of 50V-100 μ F6 mm by 12mm aluminum electrolytic capacitor
As can be seen from tables 1 to 5, the electrolyte prepared by the invention can improve the service life of the capacitor by more than 1 time compared with the existing electrolyte.
The starting materials and the components of the starting materials used in examples 7 to 12 are specified in Table 4.
Table 4 raw materials and mass percentages used in examples 7-12
Example 13
The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises 5% of main solute, 5% of auxiliary solute containing fluorine, 80% of solvent and 10% of additive by mass percent.
The main solute is ammonium formate.
The fluorine-containing auxiliary solute is ammonium octafluoro adipate.
The solvent comprises water and organic matters, and the mass percent of the water in the electrolyte is 10%.
The organic substance is ethylene glycol.
The additive comprises a waterproof agent, a hydrogen eliminating agent and an additive, wherein the mass percent of the waterproof agent in the electrolyte is 3%, the mass percent of the hydrogen eliminating agent in the electrolyte is 2%, and the mass percent of the additive in the waterproof agent in the electrolyte is 5%.
The waterproof agent is phosphoric acid.
The hydrogen eliminating agent is resorcinol.
The additive is triethylamine;
the preparation method of the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises the following steps:
the method comprises the following steps: adding the main solute and the fluorine-containing auxiliary solute into the solvent at 50 ℃, and stirring until the main solute and the fluorine-containing auxiliary solute are uniformly mixed to obtain a mixed solution;
step two: adding an additive into the mixed solution obtained in the step one at 90 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step three: and (4) boiling the mixed solution obtained in the step two at 120 ℃ for 40min, and cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
Example 14
The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises 5% of main solute, 0.01% of auxiliary solute containing fluorine, 90% of solvent and 4.99% of additive in percentage by mass.
The main solute is ammonium benzoate.
The fluorine-containing auxiliary solute is octafluoro adipic acid.
The solvent comprises water and organic matters, and the mass percent of the water in the electrolyte is 70%.
The organic substance is N-N-dimethylformamide.
The additive comprises a waterproof agent, a hydrogen eliminating agent and an additive, wherein the mass percent of the waterproof agent in the electrolyte is 1%, the mass percent of the hydrogen eliminating agent in the electrolyte is 2%, and the mass percent of the additive in the waterproof agent in the electrolyte is 1.99%.
The waterproof agent is a mixture of ammonium dihydrogen phosphate and phosphorous acid.
The dehydrogenating agent is a mixture of p-nitrobenzoic acid and p-nitrobenzyl alcohol.
The additive is a mixture of triethanolamine and formamide;
the preparation method of the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises the following steps:
the method comprises the following steps: adding the main solute and the fluorine-containing auxiliary solute into the solvent at 90 ℃, and stirring until the main solute and the fluorine-containing auxiliary solute are uniformly mixed to obtain a mixed solution;
step two: adding an additive into the mixed solution obtained in the step one at 90 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step three: and (4) boiling the mixed solution obtained in the step two at 100 ℃ for 50min, and cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
Example 15
The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises 20% of main solute, 5% of auxiliary solute containing fluorine, 60% of solvent and 15% of additive in percentage by mass.
The main solute is ammonium maleate.
The fluorine-containing auxiliary solute is a mixture of ammonium octafluoro adipate and octafluoro adipic acid.
The solvent comprises water and organic matters, and the mass percent of the water in the electrolyte is 40%.
The organic substance is a mixture of n-butanol, diethylene glycol, propylene glycol and glycerol.
The additive comprises a waterproof agent, a hydrogen eliminating agent and an additive, wherein the mass percent of the waterproof agent in the electrolyte is 1%, the mass percent of the hydrogen eliminating agent in the electrolyte is 10%, and the mass percent of the additive in the waterproof agent in the electrolyte is 4%.
The waterproof agent is a mixture of ammonium phosphite, ammonium hypophosphite, phosphane, phospholipid, phosphotungstic acid and ammonium phosphotungstate.
The dehydrogenating agent is a mixture of p-nitrophenol, o-nitroanisole, p-benzoquinone dinitrobenzene and dinitrophenol.
The additive is a mixture of butanedioxime, chrome black T, o-phenanthroline and 8-hydroxyquinoline;
the preparation method of the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises the following steps:
the method comprises the following steps: adding the main solute and the fluorine-containing auxiliary solute into the solvent at 70 ℃, and stirring until the main solute and the fluorine-containing auxiliary solute are uniformly mixed to obtain a mixed solution;
step two: adding an additive into the mixed solution obtained in the step one at 85 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step three: and (4) boiling the mixed solution obtained in the step two at 110 ℃ for 40min, and cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
Example 16
The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises, by mass, 10% of a main solute, 3% of a fluorine-containing auxiliary solute, 86.97% of a solvent and 0.03% of an additive.
The main solute is ammonium adipate.
The fluorine-containing auxiliary solute is ammonium tetrafluorosuccinate.
The solvent comprises water and organic matters, and the mass percentage of the water in the electrolyte is 20%.
The organic substance is diethylene glycol.
The additive comprises a waterproof agent, a hydrogen eliminating agent and an additive, wherein the mass percent of the waterproof agent in the electrolyte is 0.01%, the mass percent of the hydrogen eliminating agent in the electrolyte is 0.01%, and the mass percent of the additive in the electrolyte is 0.01%.
The waterproof agent is ammonium phosphite.
The dehydrogenation agent is m-nitroacetophenone.
The additive is o-non-pyrroline;
the preparation method of the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance comprises the following steps:
the method comprises the following steps: adding the main solute and the auxiliary solute containing fluorine into the solvent at 50-90 ℃, and stirring until the main solute and the auxiliary solute are uniformly mixed to obtain a mixed solution;
step two: adding an additive into the mixed solution obtained in the step one at 85-90 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step three: and (4) boiling the mixed solution obtained in the step two at 100 ℃ for 50min, and cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
The additive in the invention is a waterproof agent, a hydrogen eliminating agent or an additive. The waterproof agent is one or more of phosphoric acid, ammonium dihydrogen phosphate, phosphorous acid, hypophosphorous acid, ammonium phosphite and ammonium hypophosphite; the hydrogen eliminating agent is one or more of resorcinol, p-nitrobenzoic acid, p-nitrobenzyl alcohol, m-nitroacetophenone, p-nitrophenol, o-nitroanisole, p-benzoquinone dinitrobenzene and dinitrophenol; the additive is one or more of triethylamine, triethanolamine, formamide, succinoxime, chrome black T, o-phenanthroline and 8-hydroxyquinoline. The additive can achieve the aims of reducing corrosion to an anode dielectric film, adjusting pH and inhibiting the generation of alumina precipitate.
The electrolyte can inhibit the generation of the hydrated oxide of the anode under the working voltage of 2-160V; and the oxidation efficiency is high, the repair of the anodic oxide film of the aluminum electrolytic capacitor is facilitated, and the self-healing characteristic of the aluminum electrolytic capacitor can be improved. On the basis of improving the hydration resistance of the anode of the electrolytic capacitor, the electric conductivity of the electrolyte can be improved by introducing water into the electrolyte, and the repairing performance of an anode oxide film of the aluminum electrolytic capacitor is improved, so that the frequency characteristic is improved, and the loss and the leakage current are reduced; the introduction of water into the electrolyte can also reduce the dosage of other organic solvents and reduce the cost. The additive of the invention can play the roles of inhibiting the generation of anode hydrous oxide, adjusting pH and inhibiting the generation of alumina precipitate. The synergistic effect of the components in the electrolyte can greatly improve the service life of the low-voltage aluminum electrolytic capacitor. Compared with a medium-high voltage aluminum electrolytic capacitor using conventional electrolyte, the service life of the low-voltage aluminum electrolytic capacitor using the electrolyte can be prolonged by more than 1 time.
Claims (8)
1. The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance is characterized by comprising 5-25% of a main solute, 0.01-5% of a fluorine-containing auxiliary solute, 60-90% of a solvent and 0.03-15% of an additive by mass percent;
the main solute is one or more of ammonium formate, ammonium benzoate, ammonium maleate, dicarboxylic acid with 4-6 carbon atoms and dicarboxylic acid ammonium salt;
the fluorine-containing auxiliary solute is one or more of perfluorinated dicarboxylic acid with the carbon atom number of 4-6 and ammonium salt of perfluorinated dicarboxylic acid.
2. The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance as claimed in claim 1, wherein the solvent comprises water and organic matters, and the mass percent of the water in the electrolyte is 10-70%.
3. The electrolyte for a low-voltage aluminum electrolytic capacitor with high hydration resistance according to claim 2, wherein the organic substance is one or more of ethylene glycol, N-dimethylformamide, γ -butyrolactone, N-butanol, diethylene glycol, propylene glycol and glycerol.
4. The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance as claimed in claim 1, wherein the additive comprises 0.01-10% by mass of the water-proof agent, 0.01-10% by mass of the hydrogen eliminating agent and 0.01-10% by mass of the additive.
5. The electrolyte for a low-voltage aluminum electrolytic capacitor with high hydration resistance as claimed in claim 4, wherein the water-proofing agent is one or more of phosphoric acid, ammonium dihydrogen phosphate, phosphorous acid, hypophosphorous acid, ammonium phosphite, ammonium hypophosphite, phosphane, phospholipid, phosphotungstic acid and ammonium phosphotungstate.
6. The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance as claimed in claim 4, wherein the hydrogen scavenger is one or more of resorcinol, p-nitrobenzoic acid, p-nitrobenzyl alcohol, m-nitroacetophenone, p-nitrophenol, o-nitroanisole, p-benzoquinone dinitrobenzene and dinitrophenol.
7. The electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance as claimed in claim 4, wherein the additive is one or more of triethylamine, triethanolamine, formamide, succinoxime, chrome black T, o-phenanthroline and 8-hydroxyquinoline.
8. A method for preparing the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance according to claim 1, comprising the steps of:
the method comprises the following steps: weighing 5-25% of main solute, 0.01-5% of auxiliary solute containing fluorine, 60-90% of solvent and 0.03-15% of additive according to mass percentage;
step two: adding a main solute and a fluorine-containing auxiliary solute into a solvent at 50-90 ℃, and stirring until the main solute and the fluorine-containing auxiliary solute are uniformly mixed to obtain a mixed solution;
step three: adding the additive into the mixed solution obtained in the second step at 85-90 ℃, and stirring until the mixture is uniformly mixed to obtain a mixed solution;
step four: and boiling the mixed solution obtained in the third step at 90-120 ℃ for 30-120min, and cooling to obtain the electrolyte for the low-voltage aluminum electrolytic capacitor with high hydration resistance.
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| JP2003173935A (en) * | 2001-09-28 | 2003-06-20 | Sanyo Chem Ind Ltd | Electrolyte solution for electrochemical capacitor and electrochemical capacitor using the same |
| CN1529892A (en) * | 2001-09-26 | 2004-09-15 | 如碧空株式会社 | Electrolyte solution for driving electrolytic capacitor and electrolytic capacitor |
| CN104134544A (en) * | 2014-07-25 | 2014-11-05 | 宁国市裕华电器有限公司 | Electrolyte of high-frequency ripple-resistant aluminum electrolytic capacitor |
| CN105977027A (en) * | 2016-08-04 | 2016-09-28 | 湖南柯立凯科技开发有限公司 | Electrolyte for aluminum electrolytic capacitor |
| CN107230550A (en) * | 2017-06-01 | 2017-10-03 | 合肥尚强电气科技有限公司 | High-performance flame-retardant electrolyte and preparation method thereof |
| CN111149183A (en) * | 2017-09-29 | 2020-05-12 | 松下知识产权经营株式会社 | Electrolytic capacitor |
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| CN1529892A (en) * | 2001-09-26 | 2004-09-15 | 如碧空株式会社 | Electrolyte solution for driving electrolytic capacitor and electrolytic capacitor |
| JP2003173935A (en) * | 2001-09-28 | 2003-06-20 | Sanyo Chem Ind Ltd | Electrolyte solution for electrochemical capacitor and electrochemical capacitor using the same |
| CN104134544A (en) * | 2014-07-25 | 2014-11-05 | 宁国市裕华电器有限公司 | Electrolyte of high-frequency ripple-resistant aluminum electrolytic capacitor |
| CN105977027A (en) * | 2016-08-04 | 2016-09-28 | 湖南柯立凯科技开发有限公司 | Electrolyte for aluminum electrolytic capacitor |
| CN107230550A (en) * | 2017-06-01 | 2017-10-03 | 合肥尚强电气科技有限公司 | High-performance flame-retardant electrolyte and preparation method thereof |
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