CN101004978A - Process for preparing low ESR solid electrolytic capacitor - Google Patents
Process for preparing low ESR solid electrolytic capacitor Download PDFInfo
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- CN101004978A CN101004978A CNA2006100377925A CN200610037792A CN101004978A CN 101004978 A CN101004978 A CN 101004978A CN A2006100377925 A CNA2006100377925 A CN A2006100377925A CN 200610037792 A CN200610037792 A CN 200610037792A CN 101004978 A CN101004978 A CN 101004978A
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Abstract
Characters of the modified method are that the rolled up core packet is dipped in oxidant and monomer singly. The method keeps homogeneity of containing immersion fluid (IF), prevents IF from producing low polymer so as to create condition for forming polymer with ideal conducting power. Integral dipping operation increases quantity of adsorbing monomer and oxidant. Moreover, ideal polymer layer can be obtained through one time of dipping operation for each IF so that it is easy of implementation. Using assisting heat treatment (HT) for core packet, and applying voltage to repair oxide film makes carbonization of electrolytic paper turn to mesh structure of carbon. After HT, voltage is applied to core packet to repair oxide film on surface of aluminum foil destroyed in preparation procedure to reduce leakage current. HT removes solvent of IF so as to be in favor of absorbing IF in second time. The invention obtains solid electrolytic capacitor with ESR less than 10 mega ohms.
Description
Technical field:
The present invention is the improvement to the solid electrolytic capacitor preparation method, relates in particular to a kind ofly to prepare simple and can obtain preparation method than low ESR solid electrolytic capacitor.
Background technology:
The liquid medium electric capacity that solid electrolytic capacitor is more common has advantages such as low series equivalent resistance (ESR), high anti-ripple current, long-life under the high frequency state, thereby obtains paying attention to and promoting.The series equivalent resistance of capacitor (ESR), the wave-sucking performance of direct shadow electric capacity under the high frequency state finally influences the voltage and the electric current quality of institute's application circuit, so is an important indicator of electric capacity.Along with the raising of electronic product function and performance, also harsh more to the high frequency characteristics requirement of electric capacity, so people attempt by various methodologies reduction solid electrolytic capacitor ESR, to satisfy the high frequency characteristics requirement of electric capacity.
Chinese patent CN1698146A discloses a kind of manufacture for solid electrolytic capacitor, adopt thiophene-based monomer and alkoxy benzene sulfonic acid or alkyl sulfonic acid slaine oxidant mixed solution, dipping capacitor core bag forms electroconductive polymer layer by heat (about 300 ℃) polymerization reaction in capacitor.Its deficiency is that monomer and oxidant are hybridly prepared into solution, in preparation, use neutralization all carrying out polymerization reaction when parking, be difficult to keep the homogeneity of mixed liquor, thereby can produce more low polymer, be difficult to form the polymer of ideal conducting ability, therefore the ESR of gained electric capacity is generally 15-16m Ω, and is still higher.
Disclosed solid electrolytic capacitor of Chinese patent CN1273677A and manufacture method, the aluminium foil that changes into is cut into required size to be dipped in the 2 mol ammonium sulfates, drying is 3 minutes under the taking-up room temperature, again this aluminium foil is dipped in the aqueous isopropanol of 3.4-ethylidene dioxy base thiophene of 1 mol, takes out and place 40 ℃ atmosphere to carry out polymerization in following 10 minutes.After repeating above-mentioned technology 20 times then, in 50 ℃ of warm water, clean 10 minutes, under 100 ℃ of temperature, dry 30 minutes, form conductive polymer coating thereafter.This separately impregnation oxidant and monomer methods, though can avoid mixing the inhomogeneity that contains immersion liquid, but because of this method is with the aluminium foil impregnation, and the adsorption capacity of aluminium foil is very limited, causes the impregnation adsorbance limited, is not enough to form desirable polymeric layer, therefore adopt on the technology and repeat 20 times the leaching method that contains, this has not only increased the making complexity in actual industrial production, and because of being subjected to placing restrictions on of adsorption capacity, it is still limited to repeat impregnation increase adsorbance.
Though said method all can obtain the solid electrolytic capacitor of low usually ESR, because of still there being some deficiency separately, the ESR of gained electric capacity is still higher, and therefore still having is worth improved place.
Summary of the invention:
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of not only manufacturing simple, and can obtain preparation method than low ESR solid electrolytic capacitor.
Another object of the present invention is to provide a kind of preparation method who obtains to have the low ESR solid electrolytic capacitor of lower ESR (for example ESR is less than 10m Ω) than prior art.
The present invention's first purpose realizes that main the improvement is to adopt core bag whole separately impregnation oxidant and monomer, thereby can obtain comparatively desirable conductive polymer coating, makes solid electrolytic capacitor have lower ESR, and simplified the preparation of capacitor.Specifically, the preparation method of low ESR solid electrolytic capacitor of the present invention comprises that the core winding gets, and impregnation monomer and oxidant is characterized in that said impregnation is for to separate independent impregnation oxidant and monomer with the core bag that batches.
Core bag of the present invention separates independent impregnation, can be first impregnation oxidant, and the impregnation monomer also can be first impregnation monomer, impregnation oxidant more again.For making gained solid electrolytic capacitor of the present invention have lower ESR, the present invention better is:
Separately impregnation, a kind of better is to make at first impregnation oxidant of core bag, impregnation monomer again so more helps the oxidant that the core bag adsorbs q.s thereafter, guarantees subsequent polymerisation reaction and doping.
For further increasing core bag impregnation for the second time uptake, preferably after the impregnation first time, after the impregnation solvent is removed in heat treatment, carry out the impregnation second time again.
For improving the adsorption capacity of core bag, make it to adsorb more monomer and oxidant, better be the core Bao Xianjing heat treatment of will batch, reach one and remove the ash material that contains in the coring bag, two make the electrolytic paper carbonization become the network structure of mainly being made up of carbon, help adsorbing more oxidant and monomer.Through test relatively, heat treatment temperature is low excessively, can cause the electrolytic paper carbonization insufficient, is unfavorable for the absorption of monomer and the formation of polymer; Heat treatment temperature is too high, then can cause the electrolytic paper fibrous matter to lose to the greatest extent, causes electrolyte to cross the thin insulation property that influence electric capacity, core bag of the present invention heat treatment, and a kind of better is to be warming up to 300 ℃ ± 10 ℃.
For make aluminium foil batch with heat treatment process in the anode surface oxide-film that damages repaired, a kind of better is formation voltage at the after-applied oxide-film of heat treatment, repairs oxide-film.Apply overtension, can cause the specific volume of aluminium foil to reduce; Cross that low then repairing effect is not ideal enough, can cause the product leakage current to increase, therefore suitable apply the formation voltage that voltage is oxide-film, neither but suitably depart from.
The present invention helps keeping containing the homogeneity of immersion liquid because employing separates independent impregnation oxidant and monomer with the core bag that batches, and stops to contain immersion liquid and produces low polymer, thereby be that the polymer that forms desirable conductive capability creates conditions; The whole impregnation of core bag has not only increased the adsorbance of monomer and oxidant, and has only needed each impregnation once just can access desirable polymeric layer, and realized easily on the technology.Be aided with the heat treatment of core bag and apply voltage and repair oxide-film, can make the electrolytic paper carbonization become the network structure of forming by carbon, thereby increase the adsorption capacity of core bag; After heat treatment, the core bag is applied voltage, make the oxide-film of aluminium foil surface destroyed in the preparation process obtain repairing, reduced the leakage current that forms product.After the impregnation for the first time, the impregnation solvent is removed in heat treatment, helps containing for the second time the absorption of immersion liquid.Preparation method of the present invention can obtain the solid electrolytic capacitor of ESR less than 10m Ω.
Below in conjunction with several preferable embodiments, further specify the present invention.
Embodiment
Below implementing with 4V560 μ F electrolytic capacitor is example.
Embodiment 1:
Core packs work: the cathode and anode paper tinsel is gone up negative, positive guide pin by the form riveted joint of thorn riveting, and the cathode and anode paper tinsel of having riveted guide pin is reeled with electrolytic paper at interval forms the core bag, is fixed with adhesive tape.
Oxidant p-methyl benzenesulfonic acid iron is made into the alcoholic solution of 40%-60%, the core bag that batches is soaked guaranteed abundant immersion in 3-6 minute, wait the core bag fully to absorb the back and take out, put into 60-70 ℃ of baking oven, remove alcoholic solvent.
Monomer 3,4 alkylidene dioxygen thiophene are made into the alcoholic solution of 40%-55%, the core after impregnation oxidant and the drying are comprised in the alcoholic solution that is dipped in monomer 2-4 minute and guarantee that fully absorbing the back takes out.
Core bag after the impregnation is removed alcoholic solvent earlier under 60-70 ℃, be warming up to 110-120 ℃ and make it to produce polymerization reaction, form the conducting polymer conductive layer.Seal rubber with on the core packing, put into the aluminum hull crimping and put and mould cover, apply rated voltage 1.2 extraordinarily with after aging 100 minutes, testing, sorting.The gained capacity measurement the results are shown in subordinate list.
Embodiment 2: as embodiment 1, after batching the core bag, core wrapped in 300 ℃ ± 10 ℃ heat-treat earlier, make it abundant carbonization, remove ash, and impregnation respectively then, and make electric capacity.The gained capacity measurement the results are shown in subordinate list.
Embodiment 3: as embodiment 2, after heat treatment, the core bag is placed in the aqueous solution of hexanedioic acid ammonium of 5%--7%, applies 9V voltage and repaired the oxide-film that damages in 15 minutes, and impregnation respectively then, and make electric capacity.The gained capacity measurement the results are shown in subordinate list.
Embodiment gained capacity measurement result
| Measuring capacity | tgδ | ESR | ?LC | |
| Example 1 | 532μF | 3.70％ | 13.2mΩ | ?60μA |
| Example 2 | 539μF | 3.42％ | 9.0mΩ | ?59μA |
| Example 3 | 541μF | 3.41％ | 8.5mΩ | ?21μA |
Illustrate: result of the test is the mean value of 200 products.
Claims (7)
1, the preparation method of low ESR solid electrolytic capacitor comprises that the core winding gets, and impregnation monomer and oxidant is characterized in that said impregnation is for to separate independent impregnation oxidant and monomer with the core bag that batches.
2,, it is characterized in that the core bag that will batch earlier makes the electrolytic paper carbonization through Overheating Treatment, more separately impregnation according to the preparation method of the described low ESR solid electrolytic capacitor of claim 1.
3,, it is characterized in that the heat treatment of said core bag is for being warming up to 300 ℃ ± 10 ℃ according to the preparation method of the described low ESR solid electrolytic capacitor of claim 2.
4,, it is characterized in that at first impregnation oxidant of core bag, thereafter impregnation monomer again according to the preparation method of claim 1,2 or 3 described low ESR solid electrolytic capacitors.
5, according to the preparation method of the described low ESR solid electrolytic capacitor of claim 4, it is characterized in that the impregnation solvent is removed in impregnation after-baking for the first time after, carry out the impregnation second time again.
6,, it is characterized in that the after-applied voltage reparation of core bag heat treatment oxide-film according to the preparation method of claim 1,2,3 or 5 described low ESR solid electrolytic capacitors.
7,, it is characterized in that the said voltage that applies is that oxide-film forms voltage according to the preparation method of the described low ESR solid electrolytic capacitor of claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100377925A CN101004978A (en) | 2006-01-16 | 2006-01-16 | Process for preparing low ESR solid electrolytic capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100377925A CN101004978A (en) | 2006-01-16 | 2006-01-16 | Process for preparing low ESR solid electrolytic capacitor |
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| CN101004978A true CN101004978A (en) | 2007-07-25 |
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| CNA2006100377925A Pending CN101004978A (en) | 2006-01-16 | 2006-01-16 | Process for preparing low ESR solid electrolytic capacitor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107481861A (en) * | 2017-08-10 | 2017-12-15 | 肇庆绿宝石电子科技股份有限公司 | A kind of manufacture method of solid electrolytic capacitor |
| CN109686568A (en) * | 2019-01-14 | 2019-04-26 | 珠海格力新元电子有限公司 | Capacitor and preparation method thereof |
| CN112420390A (en) * | 2020-11-17 | 2021-02-26 | 益阳市万京源电子有限公司 | Preparation method of solid-state aluminum electrolytic capacitor with high electrostatic capacity |
-
2006
- 2006-01-16 CN CNA2006100377925A patent/CN101004978A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107481861A (en) * | 2017-08-10 | 2017-12-15 | 肇庆绿宝石电子科技股份有限公司 | A kind of manufacture method of solid electrolytic capacitor |
| CN109686568A (en) * | 2019-01-14 | 2019-04-26 | 珠海格力新元电子有限公司 | Capacitor and preparation method thereof |
| CN112420390A (en) * | 2020-11-17 | 2021-02-26 | 益阳市万京源电子有限公司 | Preparation method of solid-state aluminum electrolytic capacitor with high electrostatic capacity |
| CN112420390B (en) * | 2020-11-17 | 2022-08-02 | 益阳市万京源电子有限公司 | Preparation method of solid-state aluminum electrolytic capacitor with high electrostatic capacity |
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