CN1726568A - Solid electrolytic capacitor and method for manufacturing same - Google Patents
Solid electrolytic capacitor and method for manufacturing same Download PDFInfo
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- CN1726568A CN1726568A CN 200380105788 CN200380105788A CN1726568A CN 1726568 A CN1726568 A CN 1726568A CN 200380105788 CN200380105788 CN 200380105788 CN 200380105788 A CN200380105788 A CN 200380105788A CN 1726568 A CN1726568 A CN 1726568A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 154
- 239000007787 solid Substances 0.000 title claims abstract description 153
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims 4
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- 229910052709 silver Inorganic materials 0.000 claims abstract description 148
- 239000004332 silver Substances 0.000 claims abstract description 148
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 10
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 239000010955 niobium Substances 0.000 claims abstract description 9
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 239000010936 titanium Substances 0.000 claims abstract description 9
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 9
- 239000010937 tungsten Substances 0.000 claims abstract description 9
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 claims description 41
- 239000000758 substrate Substances 0.000 claims description 37
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- 238000000576 coating method Methods 0.000 claims description 27
- 229910001923 silver oxide Inorganic materials 0.000 claims description 20
- 239000010439 graphite Substances 0.000 claims description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 12
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- 238000003475 lamination Methods 0.000 claims description 8
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- 239000006229 carbon black Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 42
- 239000006230 acetylene black Substances 0.000 description 18
- 239000002904 solvent Substances 0.000 description 9
- AZUYLZMQTIKGSC-UHFFFAOYSA-N 1-[6-[4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-3-(1-methylindazol-5-yl)pyrazol-1-yl]-2-azaspiro[3.3]heptan-2-yl]prop-2-en-1-one Chemical compound ClC=1C(=C2C=NNC2=CC=1C)C=1C(=NN(C=1C)C1CC2(CN(C2)C(C=C)=O)C1)C=1C=C2C=NN(C2=CC=1)C AZUYLZMQTIKGSC-UHFFFAOYSA-N 0.000 description 7
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- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
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- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- IUVCFHHAEHNCFT-INIZCTEOSA-N 2-[(1s)-1-[4-amino-3-(3-fluoro-4-propan-2-yloxyphenyl)pyrazolo[3,4-d]pyrimidin-1-yl]ethyl]-6-fluoro-3-(3-fluorophenyl)chromen-4-one Chemical compound C1=C(F)C(OC(C)C)=CC=C1C(C1=C(N)N=CN=C11)=NN1[C@@H](C)C1=C(C=2C=C(F)C=CC=2)C(=O)C2=CC(F)=CC=C2O1 IUVCFHHAEHNCFT-INIZCTEOSA-N 0.000 description 1
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Abstract
A solid electrolytic capacitor comprises an anode formed of at least one metal selected from tantalum, niobium, titanium and tungsten, and a dielectric layer, an electrolytic layer and a cathode disposed on the anode, wherein the cathode comprises a mixed layer containing a first material consisting of silver particles having an average particle diameter (median diameter) of not less than 2 mum, a second material consisting of conducting carbon particles and/or silver particles having an average particle diameter (median diameter) of 1 mum or less and a binding agent.
Description
Technical field
The present invention relates to Solid electrolytic capacitor And Manufacturing approach, be particularly related to by being selected from lamination dielectric layer on the anode that the metal more than at least a constitutes in tantalum, niobium, titanium and the tungsten, press the solid electrolytic capacitor of dielectric substrate and negative electrode on this dielectric layer upper strata, it is characterized in that, improved negative electrode, with equivalent series resistance (ESR) reduction of high-frequency region.
Background technology
All the time, solid electrolytic capacitor is used in PC etc.
In recent years because the high frequencyization of CPU in the PC, must the instantaneous electric current that provides to circuit, for this reason, wish to develop the little solid electrolytic capacitor of equivalent series resistance in the high-frequency region.
Here,, can be used on usually and form the dielectric layer that constitutes by its oxide on the anode that constitutes by metals such as tantalums, the capacitor of pressing dielectric substrate and negative electrode to form on this dielectric layer upper strata as above-mentioned solid electrolytic capacitor.
As the negative electrode of this solid electrolytic capacitor, can be used on 2 layers of negative electrode that forms of lamination carbon-coating and silver layer on the above-mentioned dielectric substrate usually.
But, at lamination in the negative electrode of above-mentioned carbon-coating and silver layer because carbon-coating has different character with silver layer, so the contact resistance between carbon-coating and the silver layer increases, the problem that the equivalent series resistance of high-frequency region increases has appearred thus.
For this reason, in recent years, in open the flat 10-242000 of communique number of Japan special permission, following solid electrolytic capacitor has been proposed: carbon-coating, carbon and the mixed layer of silver, 3 floor of silver layer are set are used as negative electrode, so that the equivalent series resistance of high-frequency region descends on dielectric substrate.
But, inventor's result of study is: when mixed layer, silver layer 3 layers that are to be provided with on the dielectric substrate as mentioned above carbon-coating, carbon and silver are used as negative electrode, the mixed layer and the contact resistance between the silver layer of carbon and silver increase, still can not be fully with the equivalent series resistance reduction of high-frequency region.
Summary of the invention
Problem of the present invention is to solve the above-mentioned problem of solid electrolytic capacitor, and its purpose is to reduce the contact resistance in the solid electrolytic capacitor etc., makes the little solid electrolytic capacitor of equivalent series resistance of high-frequency region.
Solid electrolytic capacitor of the present invention is by the solid electrolytic capacitor that is selected from lamination dielectric layer, dielectric substrate and negative electrode on the anode that the metal more than at least a constitutes in tantalum, niobium, titanium and the tungsten, it is characterized in that above-mentioned negative electrode has the mixed layer that contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of average grain diameter (middle footpath (メ ジ ア Application footpath)) more than 2 μ m; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or average grain diameter (middle footpath).
As above-mentioned solid electrolytic capacitor, if on dielectric substrate, be provided as the words of the following mixed layer of negative electrode, in this mixed layer, by middle footpath between the 1st material that the silver particles more than the 2 μ m constitutes, put into the 2nd material that the silver particles below 1 μ m constitutes by conductive carbon particle or footpath, can improve the conductivity in this mixed layer, also the adhesiveness of this mixed layer and above-mentioned dielectric substrate is improved simultaneously, also its contact resistance is reduced, the equivalent series resistance of big senior general's high-frequency region reduces: above-mentioned mixed layer contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of middle footpath more than 2 μ m; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or middle footpath.
In above-mentioned solid electrolytic capacitor, the carbon-coating that is present between above-mentioned dielectric substrate and the above-mentioned mixed layer is set in above-mentioned negative electrode.
On above-mentioned dielectric substrate, form carbon-coating, following mixed layer is set on this carbon-coating, in this mixed layer, by middle footpath between the 1st material that the silver particles more than the 2 μ m constitutes, put into the 2nd material that the silver particles below 1 μ m constitutes by conductive carbon particle or footpath, can improve the conductivity in this mixed layer, also the adhesiveness of this mixed layer and above-mentioned carbon-coating is improved simultaneously, also its contact resistance is reduced, the equivalent series resistance of big senior general's high-frequency region reduces: above-mentioned mixed layer contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of middle footpath more than 2 μ m; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or middle footpath.
In above-mentioned solid electrolytic capacitor, in above-mentioned mixed layer, amount as if the 2nd material that is made of the silver particles below 1 μ m by conductive carbon particle or middle footpath is few, by middle footpath between the 1st material that the silver particles more than the 2 μ m constitutes, the 2nd material that the silver particles below 1 μ m constitutes by conductive carbon particle or footpath can not be fully put into, above-mentioned effect can not be fully obtained.On the other hand, if above-mentioned the 2nd material is too much, the amount of the 1st material that particle diameter is big reduces, and electric current is by most contact portion, and interparticle contact resistance increases, and equivalent series resistance increases.For this reason, for the total amount of above-mentioned the 1st material and the 2nd material, better the amount with the 2nd material is controlled in the scope of 0.5-40wt%., better in the scope of 3-40wt%.
In above-mentioned solid electrolytic capacitor, be difficult to the silver particles of footpath below 1 μ m that obtain to be used for above-mentioned mixed layer by pulverizing, so when obtaining the silver particles of above-mentioned middle footpath below 1 μ m, better the silver oxide particle of middle footpath below 1 μ m reduced.
When obtaining to contain the mixed layer of the silver particles of above-mentioned middle footpath below 1 μ m, the silver oxide particle of footpath below 1 μ m is contained in the mixed layer in making, and makes this silver oxide particle reduction.
The silver oxide particle of footpath below 1 μ m in containing in mixed layer when making this silver oxide particle reduction, heat-treated under the temperature more than 160 ℃ more fortunately.
In above-mentioned solid electrolytic capacitor, for the contact area with the silver particles of the silver particles of above-mentioned the 1st material and the 2nd material increases, improve the conductivity in the mixed layer, reduce equivalent series resistance, as the silver particles of above-mentioned the 1st material and/or the silver particles of the 2nd material, more handy for the very little lepidiod silver particles of length thickness.
When adopting the flakey silver particles as the 1st material, adopt the silver particles of median (median, median) more than 2 μ m of maximum length, in addition, when adopting lepidiod silver particles, adopt the silver particles of median below 1 μ m of maximum length as the 2nd material.The maximum length of these silver particles is meant the maximum length of the line part of being drawn between 2 of particle periphery.The median of maximum length is meant that aggregate-value in the integral distribution curve of maximum length of these particles is 50% o'clock a length.
If form the maximum length L of above-mentioned lepidiod each silver particles to the ratio (L/d) of thickness d hour, the contact area of the silver particles of the silver particles of the 1st material and the 2nd material increases, be difficult to further equivalent series resistance be reduced, on the other hand, when if above-mentioned ratio (L/d) is excessive, the amount that covers the lip-deep jointing material of these silver particles increases, be difficult to equivalent series resistance is reduced, so better adopt ratio (L/d) the lepidiod silver particles the scope of 4-100 in of maximum length L to thickness d.
In the lepidiod silver particles of median more than 2 μ m that adopts maximum length during as above-mentioned the 1st material, in the lepidiod silver particles of median below 1 μ m that adopts maximum length during as the 2nd material, the same with the situation of above-mentioned solid electrolytic capacitor, if the amount of the 2nd material in the above-mentioned mixed layer after a little while, the 2nd material can not fully enter between the 1st material, is difficult to fully obtain above-mentioned effect.On the other hand, when too much as if the amount of above-mentioned the 2nd material, the amount of the 1st material reduces, and electric current flows through most contact portion, and interparticle contact resistance increases, and equivalent series resistance increases.For this reason, for the total amount of above-mentioned the 1st material and the 2nd material, better the amount with the 2nd material is controlled in the scope of 0.5-40wt%, better it is controlled in the scope of 3-40wt%.
Because it is the same with the silver particles of middle footpath below 1 μ m, be difficult to by pulverizing the lepidiod silver particles of median below 1 μ m of the above-mentioned maximum length of acquisition, so when the lepidiod silver particles of the median that obtains above-mentioned maximum length below 1 μ m, better with the lepidiod silver oxide particle reduction of median below 1 μ m of maximum length.
When the mixed layer of the lepidiod silver oxide particle of median below 1 μ m that obtains to contain maximum length,, make this silver oxide particle reduction by the lepidiod silver oxide particle of median below 1 μ m that in mixed layer, contains maximum length.
When the lepidiod silver oxide particle of the median that in mixed layer, contains maximum length below 1 μ m, when making this silver oxide particle reduction, wish for example heat-treating under the temperature more than 160 ℃.
As the above-mentioned conductive carbon particle that is used for the 2nd material, though can adopt carbon black or graphite,, better adopt the mixture of carbon black and graphite.
As the jointing material that is used for above-mentioned mixed layer,, still, better adopt to be selected from least a in polyimide resin, epoxy resin, the mylar though can use normally used all the time known jointing material.If using, this jointing material is selected from least a in polyimide resin, epoxy resin, the mylar, in the above-mentioned the 1st solid electrolytic capacitor, the adhesiveness of above-mentioned carbon-coating and mixed layer further improves, in the above-mentioned the 2nd solid electrolytic capacitor, the adhesiveness of above-mentioned dielectric substrate and mixed layer further improves, and the equivalent series resistance of high-frequency region further descends.
Description of drawings
Fig. 1 is the schematic cross-section of the solid electrolytic capacitor of example 1 of the present invention.
Fig. 2 is the schematic cross-section of the solid electrolytic capacitor of example 2 of the present invention.
Fig. 3 is the schematic cross-section of the solid electrolytic capacitor that makes of comparative example 1.
Fig. 4 is the schematic cross-section of the solid electrolytic capacitor that makes of comparative example 2.
Embodiment
Below, the solid electrolytic capacitor to example of the present invention describes with reference to the accompanying drawings.
(example 1)
The solid electrolytic capacitor of example 1 has structure as shown in Figure 1: by being selected from least a above metal constitutes in tantalum, niobium, titanium and the tungsten anode 1 by anodic oxidation, on the surface of this anode 1, form the dielectric layer of forming by oxide 2, on this dielectric layer 2, form the dielectric substrate 3 that has adopted electroconductive polymer or manganese dioxide etc., on this dielectric substrate 3, form negative electrode 4.
In the solid electrolytic capacitor of this example 1, above-mentioned negative electrode 4 is by forming forming carbon-coating 4a on the above-mentioned dielectric substrate 3 and form following mixed layer 4b on this carbon-coating 4a: mixed layer 4b contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of middle footpath more than 2 μ m; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or middle footpath.
Can be for replacing above-mentioned the 1st material that constitutes by the silver particles of middle footpath more than 2 μ m, the median that adopts maximum length more than 2 μ m lepidiod silver particles as the 1st material; Perhaps for replacing above-mentioned the 2nd material that is made of the silver particles of middle footpath below 1 μ m, the lepidiod silver particles of median below 1 μ m that adopts maximum length is as the 2nd material.
(example 2)
Even solid electrolytic capacitor at example 2, has structure as shown in Figure 2: by being selected from least a above metal constitutes in tantalum, niobium, titanium and the tungsten anode 1 by anodic oxidation, on the surface of this anode 1, form the dielectric layer of forming by oxide 2, on this dielectric layer 2, form the dielectric substrate 3 that has adopted electroconductive polymer or manganese dioxide etc., on this dielectric substrate 3, form negative electrode 4.
In the solid electrolytic capacitor of this example 2, above-mentioned negative electrode 4 is not by forming carbon-coating 4a on above-mentioned dielectric substrate 3, and only forms following mixed layer 4b and form: mixed layer 4b contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of middle footpath more than 2 μ m; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or middle footpath.
In the solid electrolytic capacitor of this example 2, for replacing above-mentioned the 1st material that constitutes by the silver particles of middle footpath more than 2 μ m, the median that adopts maximum length more than 2 μ m lepidiod silver particles as the 1st material; Perhaps for replacing above-mentioned the 2nd material that is made of the silver particles of middle footpath below 1 μ m, the lepidiod silver particles of median below 1 μ m that adopts maximum length is as the 2nd material.
(embodiment)
Below, Solid electrolytic capacitor And Manufacturing approach to embodiments of the invention is specifically described, and enumerates comparative example simultaneously the situation of the equivalent series resistance reduction of the high-frequency region in the solid electrolytic capacitor of senior general's embodiments of the invention is illustrated.Solid electrolytic capacitor And Manufacturing approach of the present invention is not limited to following embodiment, as long as in the scope that does not change main idea of the present invention, can carry out moderate change.
(embodiment A 1)
The solid electrolytic capacitor of embodiment A 1 has the structure of the solid electrolytic capacitor shown in the above-mentioned example 1.
In this solid electrolytic capacitor, adopt tantalum roasting body as anode 1, make this anode 1 carry out anodic oxidation, form the dielectric layer 2 that constitutes by oxide-film in its surface, on this dielectric layer 2, formation forms negative electrode 4 by the dielectric substrate 3 that the polypyrrole of the electroconductive polymer that makes through electrolysis polymerization etc. constitutes on this dielectric substrate 3.
When on dielectric substrate 3, forming negative electrode 4 as mentioned above, at first can be by on dielectric substrate 3, being coated with carbon paste, and this carbon paste mixes with the ratio as the carboxy methyl cellulose of jointing material of graphite 5wt%, water 90wt%, 5wt%, this carbon paste was descended dry 30 minutes at 150 ℃, on dielectric substrate 3, formed carbon-coating 4a.
For will be similar to spherical middle footpath with 95: 5 weight ratio be the silver particles of 3 μ m and be similar to silver oxide (I) Ag that spherical middle footpath is 0.5 μ m
2Mixture 88 weight portions that the O mix particles forms, with 5 weight portions as jointing material be that the ratio of gamma-butyrolacton of the solvent of a kind of polyamidoimide of polyimide resin, 7 weight portions is mixed, make mixed layer with sticking with paste.
The above-mentioned mixed layer of coating is with sticking with paste on above-mentioned carbon-coating 4a, with its 160 ℃ dry 30 minutes down, make above-mentioned silver oxide (I) Ag simultaneously
2O particle reduction, form footpath in containing and be the silver particles of 3 μ m and silver particles that middle footpath is 0.5 μ m through the bonding mixed layer 4b of polyamidoimide.
(embodiment A 2)
In the solid electrolytic capacitor of embodiment A 2, at the mixed layer of the solid electrolytic capacitor of making the foregoing description A1 when sticking with paste, except employing be similar to spherical in the footpath be silver oxide (II) the AgO particle of 0.5 μ m replace above-mentioned in the footpath be silver oxide (I) Ag of 0.5 μ m
2Beyond the O particle, A1 is same with the foregoing description, form footpath in containing and be the silver particles of 3 μ m and silver particles that middle footpath is 0.5 μ m through the bonding mixed layer 4b of polyamidoimide.
(embodiment A 3)
In the solid electrolytic capacitor of embodiment A 3, at the mixed layer of the solid electrolytic capacitor of making the foregoing description A1 when sticking with paste, except employing be a kind of middle footpath of carbon black be the acetylene black of 0.05 μ m replace above-mentioned in the footpath be silver oxide (I) Ag of 0.5 μ m
2Beyond the O particle, A1 is same with the foregoing description, form footpath in containing and be the silver particles of 3 μ m and acetylene black that middle footpath is 0.05 μ m through the bonding mixed layer 4b of polyamidoimide.
(embodiment A 4)
In the solid electrolytic capacitor of embodiment A 4, when sticking with paste, will to be similar to silver particles that spherical middle footpath is 3 μ m, to be similar to spherical middle footpath with 95: 2.5: 2.5 weight ratio be the Ag of 0.5 μ m except adopting at the mixed layer of the solid electrolytic capacitor of making the foregoing description A1
2O particle, middle footpath are beyond the mixture that mixes of the acetylene black of 0.05 μ m, A1 is same with the foregoing description, forms footpath in containing and be the silver particles of 3 μ m, middle footpath and be the mixed layer 4b that the silver particles of 0.5 μ m and acetylene black that middle footpath is 0.05 μ m are bonded through polyamidoimide.
(Embodiment B 1)
The solid electrolytic capacitor of Embodiment B 1 has the structure of the solid electrolytic capacitor shown in the above-mentioned example 2.
In the solid electrolytic capacitor of this Embodiment B 1, in the solid electrolytic capacitor of the foregoing description A1, when on the dielectric substrate 3 that constitutes by above-mentioned polypyrrole, forming negative electrode 4, be not provided with beyond the carbon-coating 4a, A1 is same with the foregoing description, and forming by footpath in containing on above-mentioned dielectric substrate 3 is the silver particles of 3 μ m and silver particles that middle footpath is 0.5 μ m and the negative electrode 4 that constitutes through the bonding mixed layer 4b of polyamidoimide.
(comparative example 1)
In the solid electrolytic capacitor of comparative example 1, except using with respect to being similar to silver particles 88 weight portions that spherical middle footpath is 3 μ m, the silver that the ratio of the gamma-butyrolacton of the solvent of the polyamidoimide of 5 weight portions and 7 weight portions is mixed these compositions is stuck with paste beyond the paste that the mixed layer of the solid electrolytic capacitor that replaces the foregoing description A1 uses, A1 is same with the foregoing description, and the silver particles that in forming as shown in Figure 3 directly is 3 μ m is through the bonding silver layer 4c of polyamidoimide.
(comparative example 2)
In the solid electrolytic capacitor of comparative example 2, with the situation of the solid electrolytic capacitor of the foregoing description A3 same form contain be similar to spherical in the footpath be the silver particles of 3 μ m, in the footpath be the acetylene black of 0.05 μ m and polyamidoimide and behind the bonding mixed layer 4b of polyamidoimide, as shown in Figure 4, coating is with respect to middle footpath to be silver particles 88 weight portions of 3 μ m on this mixed layer 4b, the polyamidoimide of 5 weight portions, the silver that the ratio of the gamma-butyrolacton of the solvent of 7 weight portions is mixed is stuck with paste, it was descended dry 30 minutes at 150 ℃, on mixed layer 4b, form silver layer 4c.
Then, adopt the above-mentioned embodiment A 1-A4 that makes, each solid electrolytic capacitor of Embodiment B 1 and comparative example 1,2, utilize the equivalent series resistance instrument respectively frequency to be measured for the equivalent series resistance (ESR) of 100kHz, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of each solid electrolytic capacitor is illustrated in the following table 1 solid electrolytic capacitor of embodiment A 1.
Table 1
| Embodiment | Comparative example | |||||||
| A1 | A2 | | A4 | B1 | 1 | 2 | ||
| ESR | 100 | 100 | 102 | 97 | 102 | 160 | 150 | |
From this result as can be known: the solid electrolytic capacitor of embodiment A 1-A4, the solid electrolytic capacitor of Embodiment B 1, with replace above-mentioned mixed layer 4b to form only containing in the footpath be 3 μ m silver particles silver layer 4c comparative example 1 solid electrolytic capacitor, to form on above-mentioned mixed layer 4b in only containing directly be that the solid electrolytic capacitor of comparative example 2 of silver layer 4c of silver particles of 3 μ m is compared again, ESR reduces greatly; The negative electrode 4 of the solid electrolytic capacitor of the foregoing description A1-A4 is carbon-coating 4a to be set on the dielectric substrate 3 and to contain by the mixed layer 4b of middle footpath at the 1st material that the silver particles more than the 2 μ m constitutes, the silver particles below 1 μ m constitutes by conductive carbon particle or middle footpath the 2nd material; The solid electrolytic capacitor of the foregoing description B1 is: carbon-coating 4a is not set on the dielectric substrate 3, above-mentioned mixed layer 4b directly is set.
The words that the solid electrolytic capacitor of the foregoing description A1-A4 and Embodiment B 1 is compared, the solid electrolytic capacitor of the 2nd material of the silver particles of footpath below 1 μ m was compared as the embodiment A 3 of the 2nd material with the acetylene black that only adopts the conductive carbon particle during employing contained, more ESR can be reduced, particularly adopt in the solid electrolytic capacitor of material as the embodiment A 4 of the 2nd material of the acetylene black that contains middle directly silver particles below 1 μ m and conductive carbon particle, more can reduce ESR.
(embodiment A 5, A6)
In embodiment A 5, A6, in the solid electrolytic capacitor of the foregoing description A3, the kind of the conductive carbon particle in change is contained in above-mentioned mixed layer 4b, A3 is same with the foregoing description, makes each solid electrolytic capacitor of embodiment A 5 and A6.
As the conductive carbon particle, in embodiment A 5, the footpath is the graphite of 5 μ m in the employing, and in embodiment A 6, adopting the weight ratio with 1: 1 is the material of the acetylene black of 0.05 μ m and the graphite mixing that middle footpath is 5 μ m with middle footpath.
Each solid electrolytic capacitor for the above-mentioned embodiment A that makes 5, A6, same with above-mentioned situation, equivalent series resistance (ESR) when respectively frequency being 100kHz is measured, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of each solid electrolytic capacitor of embodiment A 5, A6 is presented in the following table 2 solid electrolytic capacitor of the foregoing description A3.
Table 2
| The kind of conductive carbon particle | | |
| Embodiment A | ||
| 3 | Acetylene black | 100 |
| Embodiment A 5 | Graphite | 105 |
| Embodiment A 6 | Acetylene black+graphite | 97 |
This result shows: the mixture that adopts graphite or acetylene black and graphite is as being contained in the embodiment A 5 of the conductive carbon particle among the mixed layer 4b, the solid electrolytic capacitor of A6, also same with the solid electrolytic capacitor of the embodiment A 3 that adopts acetylene black, than the solid electrolytic capacitor of comparative example 1,2, ESR greatly reduces.
Employing contains the solid electrolytic capacitor of the carbon particle of the little acetylene black of particle diameter, also more only adopts the solid electrolytic capacitor of the big graphite of particle diameter as the embodiment A 5 that is contained in the conductive carbon particle in the mixed layer 4b, more can reduce ESR greatly.Particularly adopt the solid electrolytic capacitor of embodiment A 6 of the mixture of the big graphite of little acetylene black of particle diameter and particle diameter, also more can reduce ESR.
(embodiment A 7, A8 and comparative example 3,4)
In embodiment A 7, A8 and comparative example 3,4, in the solid electrolytic capacitor of the foregoing description A1, except change is added on above-mentioned mixed layer with the Ag in sticking with paste
2The middle footpath of O particle, change among the above-mentioned mixed layer 4b with above-mentioned in the footpath be beyond the middle footpath of silver particles of the silver particles of the 3 μ m small particle diameter of mixing, A1 is same with the foregoing description, makes each solid electrolytic capacitor of embodiment A 7, A8 and comparative example 3,4.
In embodiment A 7, having adopted middle footpath is the Ag of 0.1 μ m
2The O particle, in embodiment A 8, having adopted middle footpath is the Ag of 1.0 μ m
2The O particle, in comparative example 3, having adopted middle footpath is the Ag of 1.5 μ m
2The O particle, in comparative example 4, having adopted middle footpath is the Ag of 2.0 μ m
2The O particle.Such as described, drying is 30 minutes under 160 ℃, with these Ag
2When the O particle is reduced to silver particles, will contain with reduction before the silver particles in the same middle footpath.
Each solid electrolytic capacitor for the embodiment A 7 that makes as mentioned above, A8 and comparative example 3,4, also with above-mentioned same, equivalent series resistance (ESR) when respectively frequency being 100kHz is measured, be decided to be 100 index with equivalent series resistance (ESR) with the solid electrolytic capacitor of the foregoing description A1, with the equivalent series resistance (ESR) of each solid electrolytic capacitor be presented in the following table 3.
Table 3
| Ag 2The average grain diameter of O (μ m) | ESR | |
| Embodiment A 7 | 0.1 | 98 |
| | 0.5 | 100 |
| Embodiment A 8 | 1 | 110 |
| Comparative example 3 | 1.5 | 150 |
| Comparative example 4 | 2 | 160 |
From then on the result as can be known: in mixed layer 4b, to be each solid electrolytic capacitor that the middle footpath of the silver particles of the silver particles of the 3 μ m small particle diameter of mixing is controlled at embodiment A 1, A7 and A8 below the 1 μ m with middle footpath, with will be that each solid electrolytic capacitor that the middle footpath of the silver particles of the silver particles of the 3 μ m small particle diameter of mixing surpasses the comparative example 3,4 of 1 μ m is compared with middle footpath, ESR greatly reduces.
(embodiment A 9-A18)
In embodiment A 9-A18, same with the solid electrolytic capacitor of the foregoing description A4 when mixed layer 4b is set, the weight ratio of change particle is that the silver particles of 3 μ m, middle footpath are the Ag of 0.5 μ m with middle footpath
2O particle, middle footpath are that the acetylene black of 0.05 μ m is mixed.
In embodiment A 9, change into 99.75: 0.125: 0.125, in embodiment A 10, change into 99.5: 0.25: 0.25, in embodiment A 11, change into 99: 0.5: 0.5, in embodiment A 12, change into 98: 1: 1, in embodiment A 13, change into 97: 1: 2, in embodiment A 14, change into 90: 5: 5, in embodiment A 15, change into 80: 15: 5, in embodiment A 16, change into 60: 35: 5, being 55: 40: 5 in embodiment A 17, is 50: 45: 5 in embodiment A 18, in addition, A4 is same with the foregoing description, makes each solid electrolytic capacitor of embodiment A 9-A18.
In each solid electrolytic capacitor of the embodiment A 9-A18 that makes, above-mentioned the 2nd material to be the 1st material that constitutes of the silver particles of 3 μ m by middle footpath, by Ag
2The O particle is reduced the weight rate W (wt%) of the total amount of the 2nd material that silver particles that the middle footpath that forms is 0.5 μ m and acetylene black constitutes, weight rate during above-mentioned mixing does not almost change, in the embodiment A 9 0.25wt%, in the embodiment A 10 0.5wt%, in the embodiment A 11 1wt%, in the embodiment A 12 2wt%, in the embodiment A 13 3wt%, in the embodiment A 14 10wt%, being 20wt% in the embodiment A 15, is 40wt% in the embodiment A 16, is 45wt% in the embodiment A 17, being 50wt% in the embodiment A 18, is 5wt% in the foregoing description A4.
Each solid electrolytic capacitor for the embodiment A 9-A18 that makes as mentioned above, also with above-mentioned same, equivalent series resistance (ESR) when respectively frequency being 100kHz is measured, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of above-mentioned each solid electrolytic capacitor is presented in the following table 4 solid electrolytic capacitor of the foregoing description A4.
Table 4
| Weight ratio | W(wt％) | | |||
| 3 μ m silver particles | 0.5μmAg 2O | Acetylene black | |||
| Embodiment A 9 | 99.75 | 0.125 | 0.125 | 0.25 | 145 |
| Embodiment A 10 | 99.5 | 0.25 | 0.25 | 0.5 | 115 |
| Embodiment A 11 | 99 | 0.5 | 0.5 | 1 | 105 |
| Embodiment A 12 | 98 | 1 | 1 | 2 | 105 |
| Embodiment A 13 | 97 | 1 | 2 | 3 | 100 |
| | 95 | 2.5 | 2.5 | 5 | 100 |
| Embodiment A 14 | 90 | 5 | 5 | 10 | 102 |
| Embodiment A 15 | 80 | 15 | 5 | 20 | 102 |
| Embodiment A 16 | 60 | 35 | 5 | 40 | 103 |
| Embodiment A 17 | 55 | 40 | 5 | 45 | 135 |
| Embodiment A 18 | 50 | 45 | 5 | 50 | 140 |
From this result as can be known: for by the footpath be the 1st material that constitutes of the silver particles of 3 μ m and be the silver particles of 0.5 μ m and the total amount of the 2nd material that acetylene black constitutes by middle footpath, the weight ratio W of above-mentioned the 2nd material is the interior embodiment A 4 of scope of 0.5-40wt%, each solid electrolytic capacitor of A10-A16, with above-mentioned weight ratio be the solid electrolytic capacitor of the embodiment A 9 of 0.25wt%, and above-mentioned weight ratio surpasses the embodiment A 17 of 40wt%, the solid electrolytic capacitor of A18 is compared, SER reduces greatly, the embodiment A 4 that particularly above-mentioned weight ratio W is 3-40wt%, the ESR of each solid electrolytic capacitor of A13-A16 reduces more.
(embodiment A 19, A20 and comparative example 5)
In embodiment A 19, A20 and comparative example 5, in the manufacturing of the solid electrolytic capacitor of the foregoing description A1, when sticking with paste except using at the above-mentioned mixed layer of drying, only change its baking temperature, the baking temperature of embodiment A 19 is become 170 ℃, embodiment A 20 is become 180 ℃, comparative example 5 is become beyond 150 ℃, A1 is same with the foregoing description, makes each solid electrolytic capacitor of embodiment A 19, A20 and comparative example 5.When sticking with paste, if when as comparative example 5 baking temperature being become 150 ℃, above-mentioned mixed layer is with the above-mentioned Ag that sticks with paste at the above-mentioned mixed layer of drying
2The O particle fully is not reduced to silver particles.
Each solid electrolytic capacitor for the embodiment A 19 that makes as mentioned above, A20 and comparative example 5, also with above-mentioned same, equivalent series resistance (ESR) when respectively frequency being 100kHz is measured, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of above-mentioned each solid electrolytic capacitor is presented in the following table 5 solid electrolytic capacitor of the foregoing description A1.
Table 5
| Baking temperature (℃) | ESR | |
| Comparative example 5 | 150 | 150 |
| | 160 | 100 |
| Embodiment A 19 | 170 | 100 |
| Embodiment A 20 | 180 | 100 |
From this result as can be known: contain above-mentioned Ag in drying
2When the mixed layer usefulness of O particle is stuck with paste, baking temperature is become more than 160 ℃ the Ag during mixed layer usefulness is stuck with paste
2The O particle fully is reduced to the embodiment A 1 of silver particles, each solid electrolytic capacitor of A19, A20, with baking temperature be 150 ℃, mixed layer is with the Ag in sticking with paste
2The O particle is not reduced to the solid electrolytic capacitor of the comparative example 5 of silver particles fully and compares, and ESR reduces greatly.
(embodiment A 1a, A1b, A1c and comparative example 1a, 1b, 1c)
In embodiment A 1a, A1b, A1c, in the manufacturing of the solid electrolytic capacitor of the foregoing description A1, change the kind of above-mentioned mixed layer with the used jointing material of the making of sticking with paste.
Except in embodiment A 1a, with epoxy resin as jointing material, adopt diethylene glycol monobutyl ether as solvent simultaneously, in embodiment A 1b, use mylar as jointing material, adopt cyclohexanone as solvent simultaneously, in embodiment A 1c, as jointing material, adopt propylene glycol simultaneously as beyond the solvent with phenolic resins, A1 is same with the foregoing description, makes each solid electrolytic capacitor of embodiment A 1a, A1b, A1c.
In comparative example 1a, 1b and 1c, in the solid electrolytic capacitor of making above-mentioned comparative example 1, change the kind of above-mentioned mixed layer with the used jointing material of paste.
Except in comparative example 1a, with epoxy resin as jointing material, adopt diethylene glycol monobutyl ether as solvent simultaneously, in comparative example 1b, use mylar as jointing material, adopt cyclohexanone as solvent simultaneously, in comparative example 1c, as jointing material, adopt propylene glycol simultaneously as beyond the solvent with phenolic resins, A1 is same with the foregoing description, makes each solid electrolytic capacitor of comparative example 1a, 1b and 1c.
Each solid electrolytic capacitor for the above-mentioned embodiment A 1a that makes, A1b, A1c and comparative example 1a, 1b and 1c, also with above-mentioned same, equivalent series resistance (ESR) when respectively frequency being 100kHz is measured, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of above-mentioned each solid electrolytic capacitor is presented in the following table 6 solid electrolytic capacitor of the foregoing description A1.
Table 6
| The kind of adhesive | | |
| Embodiment A | ||
| 1 | Polyamidoimide | 100 |
| Embodiment A 1a | Epoxy resin | 105 |
| Embodiment A 1b | Mylar | 105 |
| Embodiment A 1c | Phenolic resins | 160 |
| Comparative example 1 | Polyamidoimide | 160 |
| Comparative example 1a | Epoxy resin | 165 |
| Comparative example 1b | Mylar | 165 |
| Comparative example 1c | Phenolic resins | 200 |
This result is as can be known: when mixed layer is changed with the kind of sticking with paste used jointing material, the solid electrolytic capacitor of embodiment A 1a, A1b, A1c, compare with the comparative example 1a, the 1b that adopt identical jointing material, the solid electrolytic capacitor of 1c, ESR greatly reduces.
If the value of the ESR of different jointing materials is compared, when adopting polyamidoimide (polyimide resin) or epoxy resin or mylar, compare as the situation of jointing material with adopting phenolic resins as jointing material, ESR reduces greatly.
(Embodiment C 1-C3)
In Embodiment C 1-C3, except the mixed layer 4b of the solid electrolytic capacitor that changes the foregoing description A4 contained by to be similar to spherical middle footpath be the 1st material that constitutes of the silver particles of 3 μ m and be the 2nd material that constitutes of the silver particles of 0.5 μ m by being similar to spherical middle footpath, same with the situation of the foregoing description A4, make each solid electrolytic capacitor of Embodiment C 1-C3.
In Embodiment C 1, as above-mentioned the 1st material, the median that adopts maximum length be 3 μ m, maximum length L is 20 lepidiod silver particles to the ratio (L/d) of thickness d; As above-mentioned the 2nd material, the median that adopts maximum length be 0.5 μ m, maximum length L is 20 lepidiod silver particles to the ratio (L/d) of thickness d.
In Embodiment C 2, as above-mentioned the 1st material, the median that adopts maximum length be 3 μ m, maximum length L is 20 lepidiod silver particles to the ratio (L/d) of thickness d; As above-mentioned the 2nd material, same with embodiment A 4, adopting and being similar to spherical middle footpath is the silver particles of 0.5 μ m.
In Embodiment C 3, as above-mentioned the 1st material, being similar to spherical middle footpath with embodiment A 4 same employings is the silver particles of 3 μ m; As above-mentioned the 2nd material, the median that adopts maximum length be 0.5 μ m, maximum length L is 20 lepidiod silver particles to the ratio (L/d) of thickness d.
Each solid electrolytic capacitor for the Embodiment C 1-C3 that makes as mentioned above, also with above-mentioned same, equivalent series resistance (ESR) when respectively frequency being 100kHz is measured, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of above-mentioned each solid electrolytic capacitor is presented in the following table 7 solid electrolytic capacitor of the foregoing description A4.
Table 7
| The silver particles of the 1st material | The silver particles of the 2nd material | | |
| Embodiment C | |||
| 1 | Flakey | Flakey | 65 |
| | Flakey | Be similar to spherical | 93 |
| | Be similar to spherical | Flakey | 95 |
| | Be similar to spherical | Be similar to spherical | 100 |
This result is as can be known: adopt flakey silver particles each solid electrolytic capacitor as the Embodiment C 1-C3 of at least one side in the 1st material and the 2nd material, be similar to spherical silver particles with employing and compare as the solid electrolytic capacitor of the embodiment A 4 of the 1st material and the 2nd material, ESR is lowered.Particularly the 1st material and the 2nd material all adopt the solid electrolytic capacitor of the Embodiment C 1 of lepidiod silver particles, and ESR reduces greatly.
(Embodiment C 4-C7)
In Embodiment C 4-C7, the same with the situation of the foregoing description C1, as above-mentioned the 1st material, adopting the median of maximum length L is the lepidiod silver particles of 3 μ m, simultaneously as above-mentioned the 2nd material, adopting the median of maximum length is the lepidiod silver particles of 0.5 μ m, in addition, this changes the ratio (L/d) of the maximum length L of the above-mentioned the 1st and the 2nd lepidiod silver particles to thickness d, in addition, same with the foregoing description C1 situation, make each solid electrolytic capacitor of Embodiment C 4-C4.
In Embodiment C 4, adopting maximum length L is 4 the 1st and the 2nd lepidiod silver particles to the ratio (L/d) of thickness d; In Embodiment C 5, adopting maximum length L is 50 the 1st and the 2nd lepidiod silver particles to the ratio (L/d) of thickness d; In Embodiment C 6, adopting maximum length L is 100 the 1st and the 2nd lepidiod silver particles to the ratio (L/d) of thickness d; In Embodiment C 7, adopting maximum length L is 120 the 1st and the 2nd lepidiod silver particles to the ratio (L/d) of thickness d.
Each solid electrolytic capacitor for the Embodiment C 4-C7 that makes as mentioned above, also with above-mentioned same, carry out the mensuration of the equivalent series resistance (ESR) of frequency when being 100kHz respectively, be decided to be 100 index with equivalent series resistance (ESR), the equivalent series resistance (ESR) of above-mentioned each solid electrolytic capacitor is presented in the following table 8 solid electrolytic capacitor of the foregoing description A4.
Table 8
| The silver particles of the 1st material | The silver particles of the 2nd material | ESR | |||
| Shape | L/d | Shape | L/ | ||
| Embodiment C | |||||
| 4 | | 4 | | 4 | 70 |
| | Flakey | 20 | Flakey | 20 | 65 |
| Embodiment C 5 | Flakey | 50 | Flakey | 50 | 72 |
| Embodiment C 6 | Flakey | 100 | Flakey | 100 | 74 |
| Embodiment C 7 | Flakey | 120 | Flakey | 120 | 92 |
| | Be similar to spherical | Be about 1 | Be similar to spherical | Be about 1 | 100 |
This result is as can be known: adopting maximum length L be the Embodiment C 1 of the 1st and the 2nd interior lepidiod silver particles of the scope of 4-100, the solid electrolytic capacitor of C4-C6 to the ratio (L/d) of thickness d, and ESR reduces greatly.
The possibility of industrial utilization
As mentioned above, in the solid electrolytic capacitor of the present invention, when dielectric substrate arranges negative electrode, owing to be provided with the mixed layer that contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of central diameter more than 2 μ m; Silver particles below 1 μ m consists of above-mentioned the 2nd material by conductive carbon particle and/or central diameter, in this mixed layer, by central diameter in the middle of the 1st material that the silver particles more than the 2 μ m consists of, mixed the 2nd material that the silver particles below 1 μ m consists of by conductive carbon particle or central diameter, electric conductivity in this mixed layer is improved, the adhesiveness of this mixed layer and above-mentioned dielectric substrate is improved, and its contact resistance also is lowered, and the equivalent series resistance of high-frequency region reduces greatly.
In above-mentioned solid electrolytic capacitor, if when between above-mentioned dielectric substrate and above-mentioned mixed layer, being provided with carbon-coating, the adhesiveness of this mixed layer and carbon-coating is strengthened, contact resistance also is lowered, and the equivalent series resistance of high-frequency region also is further reduced.
In above-mentioned solid electrolytic capacitor, if adopt thickness to the very little lepidiod silver particles of the ratio of length during as the used silver particles of the 1st material in the above-mentioned mixed layer and the 2nd material, the contact area of the silver particles of the silver particles of the 1st material and the 2nd material increases, and the equivalent series resistance of high-frequency region is lower.
Claims (24)
1. solid electrolytic capacitor, it is by the solid electrolytic capacitor that is selected from lamination dielectric layer, dielectric substrate and negative electrode on the anode that the metal more than at least a constitutes in tantalum, niobium, titanium and the tungsten, it is characterized in that above-mentioned negative electrode has the mixed layer that contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of average grain diameter (middle footpath) more than 2 μ m; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or average grain diameter (middle footpath).
2. solid electrolytic capacitor according to claim 1 is characterized in that, above-mentioned negative electrode has the carbon-coating that is present between above-mentioned dielectric substrate and the above-mentioned mixed layer.
3. solid electrolytic capacitor according to claim 1 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 0.5-40wt%.
4. solid electrolytic capacitor according to claim 3 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 3-40wt%.
5. solid electrolytic capacitor according to claim 1 is characterized in that, above-mentioned average grain diameter (middle footpath) is the particle that the silver oxide particle reduction of average grain diameter (middle footpath) below 1 μ m formed in the silver particles below the 1 μ m.
6. solid electrolytic capacitor according to claim 1 is characterized in that, above-mentioned jointing material is to be selected from least a in polyimide resin, epoxy resin, the mylar.
7. solid electrolytic capacitor according to claim 1 is characterized in that, above-mentioned conductive carbon particle is carbon black and/or graphite.
8. manufacture method, it is the manufacture method of the described solid electrolytic capacitor of claim 1, it is characterized in that, when setting contains the above-mentioned mixed layer of the silver particles of average grain diameter (middle footpath) below 1 μ m, the silver oxide particle of average grain diameter (middle footpath) below 1 μ m is contained in the mixed layer, makes this silver oxide particle reduction.
9. the manufacture method of solid electrolytic capacitor according to claim 8 is characterized in that, when the above-mentioned silver oxide particle of reduction, heat-treats in the temperature more than 160 ℃.
10. solid electrolytic capacitor, it is by the solid electrolytic capacitor that is selected from lamination dielectric layer, dielectric substrate and negative electrode on the anode that the metal more than at least a constitutes in tantalum, niobium, titanium and the tungsten, it is characterized in that above-mentioned negative electrode has the mixed layer that contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of median more than 2 μ m of lepidiod maximum length; Silver particles below 1 μ m constitutes above-mentioned the 2nd material by conductive carbon particle and/or average grain diameter (middle footpath).
11. solid electrolytic capacitor according to claim 10 is characterized in that, above-mentioned negative electrode has the carbon-coating that is present between above-mentioned dielectric substrate and the above-mentioned mixed layer.
12. solid electrolytic capacitor according to claim 10 is characterized in that, the maximum length L of above-mentioned lepidiod silver particles to the ratio (L/d) of thickness d in the scope of 4-100.
13. solid electrolytic capacitor according to claim 10 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 0.5-40wt%.
14. solid electrolytic capacitor according to claim 13 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 3-40wt%.
15. solid electrolytic capacitor, it is by the solid electrolytic capacitor that is selected from lamination dielectric layer, dielectric substrate and negative electrode on the anode that the metal more than at least a constitutes in tantalum, niobium, titanium and the tungsten, it is characterized in that above-mentioned negative electrode has the mixed layer that contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of average grain diameter (middle footpath) more than 2 μ m; Above-mentioned the 2nd material is made of the silver particles of median below 1 μ m of conductive carbon particle and/or lepidiod maximum length.
16. solid electrolytic capacitor according to claim 15 is characterized in that, above-mentioned negative electrode has the carbon-coating that is present between above-mentioned dielectric substrate and the above-mentioned mixed layer.
17. solid electrolytic capacitor according to claim 15 is characterized in that, the maximum length L of above-mentioned lepidiod silver particles to the ratio (L/d) of thickness d in the scope of 4-100.
18. solid electrolytic capacitor according to claim 15 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 0.5-40wt%.
19. solid electrolytic capacitor according to claim 18 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 3-40wt%.
20. solid electrolytic capacitor, it is by the solid electrolytic capacitor that is selected from lamination dielectric layer, dielectric substrate and negative electrode on the anode that the metal more than at least a constitutes in tantalum, niobium, titanium and the tungsten, it is characterized in that above-mentioned negative electrode has the mixed layer that contains the 1st material, the 2nd material and jointing material; Above-mentioned the 1st material is made of the silver particles of median more than 2 μ m of lepidiod maximum length; Above-mentioned the 2nd material is made of the silver particles of median below 1 μ m of conductive carbon particle and/or lepidiod maximum length.
21. solid electrolytic capacitor according to claim 20 is characterized in that, above-mentioned negative electrode has the carbon-coating that is present between above-mentioned dielectric substrate and the above-mentioned mixed layer.
22. solid electrolytic capacitor according to claim 20 is characterized in that, form the maximum length L of above-mentioned lepidiod each silver particles to the ratio (L/d) of thickness d in the scope of 4-100.
23. solid electrolytic capacitor according to claim 20 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 0.5-40wt%.
24. solid electrolytic capacitor according to claim 23 is characterized in that, for the total amount of above-mentioned the 1st material and the 2nd material, the amount of the 2nd material is in the scope of 3-40wt%.
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| JP062000/2003 | 2003-03-07 |
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| CN101320628B (en) * | 2007-04-03 | 2012-04-04 | 三洋电机株式会社 | Electrolytic capacitor and method of producing the same |
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2003
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| CN101320628B (en) * | 2007-04-03 | 2012-04-04 | 三洋电机株式会社 | Electrolytic capacitor and method of producing the same |
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