CN104409215A - Electrode for aluminium electrolytic capacitor and preparing method for electrode - Google Patents
Electrode for aluminium electrolytic capacitor and preparing method for electrode Download PDFInfo
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- CN104409215A CN104409215A CN201410715339.XA CN201410715339A CN104409215A CN 104409215 A CN104409215 A CN 104409215A CN 201410715339 A CN201410715339 A CN 201410715339A CN 104409215 A CN104409215 A CN 104409215A
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Abstract
The invention provides a preparing method of an electrode material for an aluminium electrolytic capacitor. The preparing method comprises the following steps of firstly, preparing a slurry composition comprising powder of at least one of aluminum or aluminum alloy, bonded resin and solvent by mixing; secondly, coating at least one surface of a substrate with the slurry composition to prepare a film; thirdly, sintering the film; fourthly, performing etching treatment on the sintered film. The average particle size D50 of aluminum powder used by the preparing method disclosed by the invention is 1-50[mu]m; the prepared electrode material for the aluminium electrolytic capacitor has high electrostatic capacity at working voltage.
Description
Technical field
The present invention relates to a kind of electrode material, particularly relate to a kind of aluminium electrolytic capacitor electrode material.The invention still further relates to the manufacture method of this aluminium electrolytic capacitor electrode material.
Background technology
Aluminium electrolytic capacitor has a wide range of applications.Such as, in the household electrical appliance such as mobile phone, TV and to be used in the storage battery of the power supply of hybrid vehicle or wind power generation plant medium.Therefore, the large static capacity requiring aluminium electrolytic capacitor to have to adapt with its purposes, the characteristic of high working voltage.Existing aluminium electrolytic capacitor, the thickness of aluminium foil is 150-350 μm, on the level and smooth surface of aluminium foil, with the aluminium powder of 10-200 μm or alumina powder sinter layer.
But existing aluminium electrolytic capacitor electrode material, adhere to aluminium powder, Al alloy powder or alumina powder by electroplating and/or be deposited on aluminium foil, then form the method for sinter layer, its product does not have desired high working voltage.And, needing to increase the thickness of powder bed in order to improve static capacity, the powder of small particle diameter certainly will be adopted like this, otherwise be difficult to sintering.Therefore, the aluminium powder used as raw material or the average grain diameter D of powder of aluminium alloy
50between 2-6 μm, words that particle diameter is excessive or cause being difficult to reach desired high static capacity.
Therefore, how utilizing the powder such as the larger aluminium powder of average grain diameter to obtain the electrode material of high power capacity, thus reduce production cost, is current problem demanding prompt solution.
Summary of the invention
For solving the aforementioned problems in the prior, the present invention relates to a kind of manufacture method of aluminium electrolytic capacitor electrode, step comprises:
(1) paste compound of the powder of at least one comprising aluminum or aluminum alloy, binding resin and solvent is mixed with; In paste compound, by weight percentage, containing the powder 40-50% of at least one of aluminum or aluminum alloy, binding resin 10-20%, solvent 30-50%;
(2) coating materials feed composition prepares film at least one surface of a substrate;
(3) film is sintered;
(4) etch processes is carried out to the film through sintering.
In the inventive solutions, in the technique of etch processes, after carrying out chemical etching process by acid solution or alkaline solution, then carry out DC electrolysis etching or alternating current electrolysis etching.
Specifically, this manufacture method is first mixed with the powder of at least one comprising aluminum or aluminum alloy, the paste compound containing binding resin and solvent, then is coated in by composition on a surface of base material, forms film.The purity of preferred aluminium powder or Al alloy powder is more than 99.8%, and aluminium alloy can comprise a kind or 2 kinds of the elements such as Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti, V, Ga, Ni, B, Zr, and the content of these elements is by weight between 30-250ppm.The average grain diameter D of powder
50between 1-50 μm, preferably between 10-35 μm.The shape of powder is not limit, and can be spherical, sheet, threadiness etc., preferably spherical powder.Powder can be produced by spray drying process, also can be to be produced by mechanical crushing, other method such as chemical synthesis as sol-gal process.
In paste compound, except aluminium powder or Al alloy powder, also containing binding resin and solvent.Binding resin can be vistanex, vinyl acetate resin, vinyl chloride resin, vinyl chloride vinyl acetate copolymer resin, vinyl alcohol resin, butyral resin, polyvinyl fluoride, acrylic resin, mylar, polyurethane resin, epoxy resin, urea resin, phenolic resins, the synthetic resin such as acrylonitrile resin also can be tar, rosin, the natural resins such as beeswax.Volatilize completely when heating and do not stay or leave little residue to the requirement of binding resin.Solvent can be water, also can be the organic solvents such as ethanol, toluene, ester.
Base material can be aluminium foil, also can be other metal.Aluminium foil can be that fine aluminium is made, and also can be that aluminium alloy is made, the element that can contain in aluminium alloy comprises at least a kind of Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti, V, Ga, Ni, B, Zr etc.The thickness of aluminium foil is 5-100 μm, preferred 10-50 μm.If necessary, also resin base material can be used, optimization polypropylene resin.
If necessary, the composition such as sintering aid, surfactant can also be added in paste compound, effectively can improve the formation efficiency of film like this.Sintering aid can be silicon dioxide gel etc., and surfactant can be the basic sodium sulfonate of dodecane etc.
Film is formed at least one surface of a substrate.If all film forming words on two surfaces of base material, preferably arrange film symmetrically.The thickness of film is 10-100 μm, preferred 20-57 μm.After the techniques such as calendering, sintering, the gross thickness of sintered body should within 100 μm.Therefore, when two sides overlay film, the thickness of every layer film should within 1/3 of the gross thickness of three-decker.
The method being prepared film by paste compound can be roll-in method, spraying process, infusion process etc., also can adopt silk screen print method.At the scope inner drying film of 70-90 DEG C after having prepared.The sintering process of film is: temperature 560-660 DEG C, time 5-24 hour, and atmosphere can be vacuum, inert atmosphere or oxidizing atmosphere (air atmosphere), reducing atmosphere etc.Preferably vacuum atmosphere or reducing atmosphere.Pressure condition can be normal pressure, pressurization or decompression.And, first the film formed by paste compound is carried out to the removal resin treatment of 5 hours at 100-150 DEG C, then sinter.
Then, etch processes is carried out to the film through sintering.Etch processes can adopt acid solution or alkaline solution to carry out chemical etching, DC electrolysis also can be adopted to etch or alternating current electrolysis etching.Effectively can be increased the surface area of electrode material by etch processes, obtain the aluminium electrolytic capacitor electrode material of high static capacity.Acid solution can be hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid etc., also can be its mixture, the concentration of acid solution depending on the requirement of electrode material and purposes, preferred 1-30%.Correspondingly adjust the temperature and time of etching according to etch depth etc., preferably at 20-90 DEG C, carry out 10-30min.Similarly, the alkaline solution for etching can be NaOH solution, the preferred 1-30% of concentration.The temperature and time of etching preferably carries out 10-30min at 20-90 DEG C.
For DC electrolysis etching and/or alternating current electrolysis etching, electrolyte can be hydrochloric acid, sulfuric acid or the mixed liquor of the two, concentration of hydrochloric acid 0.1-3mol/L, sulfuric acid concentration 0.1-5mol/L, mixed liquid concentration 15-20%.Electrolysis temperature 30-95 DEG C, electrolysis time 10-120 second, electrolysis electricity 1-50C (coulomb)/cm
2, current density 100-1000mA/cm
2.By integrated use chemical etching and electrolytic etching technique, the electrode material under the high voltage of 250-550V with high static capacity can be obtained.
In the inventive solutions, the chemical etching of alkaline solution, can make the oxide layer of the sintered surface of electrode material dissolve, and be conducive to the space expanded between the powder particle of electrode material, final formation has the thin layer of high surface.When using acid solution, not only making surface oxide layer dissolve, and between powder, forming tunnel-shaped pit.When using DC electrolysis etching, contribute to further developing of tunnel-shaped pit.When using alternating current electrolysis etching, what base material and powder bed were formed is spongiform pit.
In the technique of etch processes, after carrying out etch processes by acid solution or alkaline solution, carry out DC electrolysis etching or alternating current electrolysis etching again, under the electrode material obtained both can be used in the high voltage of 250-550V, also under can being used in the low-voltage of 10V, this is because after chemical etching is except oxide layer, electrolytic etching can promote further developing of pit effectively.After an etching step, aluminium electrolytic capacitor electrode material has just been made.
In the inventive solutions, owing to have employed etch process, although the average grain diameter D of the material powders such as aluminium powder
50comparatively large, but still can be made into the aluminium electrolytic capacitor electrode material with high static capacity.Have employed the aluminium electrolytic capacitor of electrode material of the present invention, there is high static capacity, and compact, be applicable to manufacture miniaturized electronic devices.
Embodiment
Embodiment 1-8:
Aluminium electrolytic capacitor electrode material, base material is Al-Mn alloy, thickness 50 μm, and powder is aluminium powder, D
50=10 μm, be mixed with paste compound, in paste compound, aluminium powder 50%, binding resin 20%, solvent 30%;
Coating materials feed composition prepares film at least one surface of a substrate, and the thickness of film is 40 μm; This film drying, to remove after resin at the temperature of 600 DEG C vacuum-sintering 12 hours; Etch processes is carried out to the film through sintering, in the technique of etch processes, after carrying out etch processes by acid solution or alkaline solution, then carries out DC electrolysis etching or alternating current electrolysis etching.
Be configured for the acid solution of chemical erosion: the mixed liquor of hydrochloric acid and sulfuric acid, hydrochloric acid 1mol/L, sulfuric acid 3mol/L, the concentration 15% of mixed liquor.Alkaline solution: NaOH solution, concentration 15%.
DC electrolysis etches: etching liquid is the hydrochloric acid of concentration 15%, temperature 80 DEG C, electrolytic condition DC30A/50cm
2× 10sec; Alternating current electrolysis etches: etching liquid is the hydrochloric acid of concentration 15%, temperature 80 DEG C, electrolytic condition AC30A/50cm
2× 10sec.
The performance of the aluminium electrolytic capacitor electrode material obtained sees the following form.
Claims (7)
1. a manufacture method for aluminium electrolytic capacitor electrode material, is characterized in that, step comprises:
(1) paste compound of the powder of at least one comprising aluminum or aluminum alloy, binding resin and solvent is mixed with, in paste compound, by weight percentage, containing the powder 40-50% of at least one of aluminum or aluminum alloy, binding resin 10-20%, the preferred 30-50% of solvent;
(2) coating materials feed composition prepares film at least one surface of a substrate;
(3) film is sintered;
(4) etch processes is carried out to the film through sintering.
2. manufacture method as claimed in claim 1, is characterized in that: in the technique of etch processes, after carrying out etch processes by acid solution or alkaline solution, then carries out DC electrolysis etching or alternating current electrolysis etching.
3. manufacture method as claimed in claim 1, is characterized in that: the average grain diameter (D of powder
50) be 1-50 μm.
4. manufacture method as claimed in claim 1, is characterized in that: sintering temperature is 560-660 DEG C.
5. manufacture method as claimed in claim 1, is characterized in that: the thickness of described film is 10-100 μm.
6. as the manufacture method of claim 1-5, it is characterized in that: base material can be aluminium foil, also can be other metal.
7. manufacture method as claimed in claim 1, is characterized in that: the atmosphere of sintering can be vacuum, inert atmosphere or oxidizing atmosphere (air atmosphere), reducing atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410715339.XA CN104409215A (en) | 2014-11-28 | 2014-11-28 | Electrode for aluminium electrolytic capacitor and preparing method for electrode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715339.XA CN104409215A (en) | 2014-11-28 | 2014-11-28 | Electrode for aluminium electrolytic capacitor and preparing method for electrode |
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| CN104409215A true CN104409215A (en) | 2015-03-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718393A (en) * | 2019-10-31 | 2020-01-21 | 湖南艾华集团股份有限公司 | Preparation method of anode foil of medium-high voltage aluminum electrolytic capacitor and capacitor |
| CN111364016A (en) * | 2020-04-10 | 2020-07-03 | 西安交通大学 | Method for preparing porous anode aluminum foil by aid of ALD (atomic layer deposition) assisted nitrogen-doped micro-nano aluminum powder |
| CN115148501A (en) * | 2022-07-15 | 2022-10-04 | 新疆众和股份有限公司 | Hot-pressed foil and preparation method thereof, electrode and capacitor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008098279A (en) * | 2006-10-10 | 2008-04-24 | Toyo Aluminium Kk | Electrode material for aluminum electrolytic capacitor, and its manufacturing method |
| CN102017034A (en) * | 2008-04-22 | 2011-04-13 | 东洋铝株式会社 | Electrode material for aluminum electrolytic capacitor and process for producing the electrode material |
| TW201440103A (en) * | 2013-01-18 | 2014-10-16 | Toyo Aluminium Kk | Method for producing electrode material for aluminum electrolytic capacitors, and electrode material for aluminum electrolytic capacitors |
-
2014
- 2014-11-28 CN CN201410715339.XA patent/CN104409215A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008098279A (en) * | 2006-10-10 | 2008-04-24 | Toyo Aluminium Kk | Electrode material for aluminum electrolytic capacitor, and its manufacturing method |
| CN102017034A (en) * | 2008-04-22 | 2011-04-13 | 东洋铝株式会社 | Electrode material for aluminum electrolytic capacitor and process for producing the electrode material |
| TW201440103A (en) * | 2013-01-18 | 2014-10-16 | Toyo Aluminium Kk | Method for producing electrode material for aluminum electrolytic capacitors, and electrode material for aluminum electrolytic capacitors |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718393A (en) * | 2019-10-31 | 2020-01-21 | 湖南艾华集团股份有限公司 | Preparation method of anode foil of medium-high voltage aluminum electrolytic capacitor and capacitor |
| CN110718393B (en) * | 2019-10-31 | 2021-11-30 | 湖南艾华集团股份有限公司 | Preparation method of anode foil of medium-high voltage aluminum electrolytic capacitor and capacitor |
| CN111364016A (en) * | 2020-04-10 | 2020-07-03 | 西安交通大学 | Method for preparing porous anode aluminum foil by aid of ALD (atomic layer deposition) assisted nitrogen-doped micro-nano aluminum powder |
| CN111364016B (en) * | 2020-04-10 | 2021-05-28 | 西安交通大学 | Method for preparing porous anode aluminum foil by aid of ALD (atomic layer deposition) assisted nitrogen-doped micro-nano aluminum powder |
| CN115148501A (en) * | 2022-07-15 | 2022-10-04 | 新疆众和股份有限公司 | Hot-pressed foil and preparation method thereof, electrode and capacitor |
| CN115148501B (en) * | 2022-07-15 | 2023-10-03 | 新疆众和股份有限公司 | Hot-pressed foil, preparation method thereof, electrode and capacitor |
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