CN102479620B - Solid electrolytic capacitor and the manufacture method of solid electrolytic capacitor - Google Patents
Solid electrolytic capacitor and the manufacture method of solid electrolytic capacitor Download PDFInfo
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- CN102479620B CN102479620B CN201110267910.2A CN201110267910A CN102479620B CN 102479620 B CN102479620 B CN 102479620B CN 201110267910 A CN201110267910 A CN 201110267910A CN 102479620 B CN102479620 B CN 102479620B
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Abstract
The present invention provides the manufacture method of a kind of solid electrolytic capacitor and solid electrolytic capacitor.This solid electrolytic capacitor has: anode bodies；Electrolyte tunicle, it covers the surface of anode bodies；Electroconductive polymer layer, it is arranged on electrolyte tunicle；Waterproof portion, it is arranged on the electrolyte tunicle not contacted with electroconductive polymer layer, and contains silicone oil.
Description
Technical field
The present invention relates to the manufacture method of solid electrolytic capacitor and solid electrolytic capacitor.
Background technology
Since Yi Wang, as being suitable to the capacitor of miniaturization, well-known have as electrolyte, there is electroconductive polymer
The solid electrolytic capacitor of layer.In such solid electrolytic capacitor, in order to realize high capacity further, use following skill
Art, i.e. by the surface of the anode bodies being made up of metal forming being etched or by the sintered body of metal is formed as anode
Body, thus increase the surface area of anode bodies.
Such as, Japanese Unexamined Patent Publication 7-122464 publication discloses following technology, i.e. by the sintered body to tantalum
The electrolyte tunicle that surface carries out anodic oxidation and is made up of tantalum pentoxide in the formation of the surface of sintered body, at this electrolyte tunicle
Upper formation electroconductive polymer layer and manufacture solid electrolytic capacitor.Additionally, in above-mentioned publication, disclose by electric conductivity high score
Sublayer is completely covered the technology in the fine holes on the surface being formed at sintered body.
But, learn according to the research of the present inventor etc., utilizing electroconductive polymer layer by the fine holes of anode bodies
Aspect being completely covered have difficulties, a part for electrolyte tunicle is not covered by electroconductive polymer layer and exposes.For so
Solid electrolytic capacitor for, in the case of being such as positioned in the environment of high humility, outside moisture is to solid electrolytic
The inside of capacitor is impregnated with and spreads and directly contact with electrolyte tunicle, and the capacity that thus there is solid electrolytic capacitor increases
Problem.The reliability of the solid electrolytic capacitor that this capacity changes according to environment is low.
Summary of the invention
Therefore, in view of the foregoing, it is an object of the invention to provide a kind of high consolidating of reliability suppressing volume change
Body electrolysis condenser and manufacture method thereof.
The solid electrolytic capacitor of the first scheme of the present invention has: anode bodies；Electrolyte tunicle, it covers described anode
The surface of body；Electroconductive polymer layer, it is arranged on electrolyte tunicle；Waterproof portion, its be arranged on not with electroconductive polymer
On the electrolyte tunicle of layer contact, and containing silicone oil.
The manufacture method of the solid electrolytic capacitor of the alternative plan of the present invention includes: form electricity Jie on the surface of anode bodies
The operation of matter tunicle；Electrolyte tunicle is formed the operation of electroconductive polymer layer；Electroconductive polymer layer is formed the moon
The operation of pole layer, after the operation at least forming electroconductive polymer layer, has and is formed containing silicone oil on electrolyte tunicle
The operation in waterproof portion.
In accordance with the invention it is possible to provide the solid electrolytic capacitor and manufacturer thereof that the repressed reliability of volume change is high
Method.
Accompanying drawing explanation
Fig. 1 is the schematic sectional view of the solid electrolytic capacitor of embodiment 1.
Fig. 2 is the schematic sectional view on the surface of the anode bodies of the solid electrolytic capacitor representing embodiment 1.
Fig. 3 is the flow chart of an example of the manufacture method of the solid electrolytic capacitor representing embodiment 1.
Fig. 4 is that an example of the manufacture method of the solid electrolytic capacitor to embodiment 1 carries out diagrammatic schematic sectional view.
Fig. 5 is to represent the anode bodies before forming waterproof portion in the manufacture method of the solid electrolytic capacitor of embodiment 1
The schematic sectional view on surface.
Fig. 6 is the flow chart of an example of the manufacture method of the solid electrolytic capacitor representing embodiment 2.
Detailed description of the invention
Hereinafter, referring to the drawings the embodiment of the solid electrolytic capacitor of the present invention is illustrated.Following embodiment party
Formula is only an example, can implement various embodiment within the scope of the invention.It should be noted that at the accompanying drawing of the present invention
In, same reference marks represents with a part or the part suitable with it.
<embodiment 1>
" solid electrolytic capacitor "
Fig. 1 represents the schematic sectional view of the solid electrolytic capacitor of embodiment 1.In FIG, solid electrolytic capacitor
100 possess capacitor element, and this capacitor element has: erect the anode bodies 11 being provided with anode tap 12；Cover anode bodies
The electrolyte tunicle 13 on 11 surfaces；The electroconductive polymer layer 14 being arranged on electrolyte tunicle 13；It is successively set on electric conductivity
On macromolecule layer 14, as the carbon-coating 15 of cathode layer and silver coating 16.The anode tap 12 of this capacitor element connects
Having anode terminal 17, connecting via the adhesive linkage 18 being made up of conductive adhesive on silver coating 16 has cathode terminal 19.And
And, a part for a part and cathode terminal 19 to make anode terminal 17 passes through exterior resin 20 sealed capacitor in the way of exposing
Device element 10.
Fig. 2 is the schematic sectional view on the surface of the anode bodies of the solid electrolytic capacitor illustrating embodiment 1.Such as Fig. 2 institute
Showing, anode bodies 11 has recess on surface, and this recess surface is also covered by electrolyte tunicle 13.Additionally, at electrolyte tunicle 13
On be provided with electroconductive polymer layer 14, electroconductive polymer layer 14 and electrolyte tunicle 13 not in contact with part be provided with anti-
Water portion 21, contacts with waterproof portion 21 at this part electrolyte tunicle 13.That is, the surface of electrolyte tunicle 13 is by electric conductivity high score
Sublayer 14 and waterproof portion 21 cover.In waterproof portion 21 containing silicone oil.It should be noted that will later to the details of silicone oil
Describe.
" manufacture method of solid electrolytic capacitor "
Fig. 3 is the flow chart of an example of the manufacture method of the solid electrolytic capacitor representing embodiment 1, and Fig. 4 is diagram
The schematic sectional view of one example of the manufacture method of the solid electrolytic capacitor of embodiment 1.Hereinafter, with reference to Fig. 2～Fig. 4 to enforcement
One example of the manufacture method of the solid electrolytic capacitor of mode 1 illustrates.
(forming the operation of anode bodies)
First, as shown in Fig. 4 (A), step S1 of Fig. 3 forms anode bodies 11.Such as, prepare metal dust, inciting somebody to action
Under state in the end side embedment metal dust of the length direction of claval anode tap 12, by this shaping of metal powders it is
Desired shape.It follows that sinter this formed body, form the anode bodies of the porous structure of the one end being embedded with anode tap 12
11.Therefore, anode bodies 11 becomes the shape on surface with multiple recess.
Material for anode bodies 11 the most specifically limits, from the point of view of electrolyte tunicle 13 is easily formed, excellent
Choosing uses the valve metals such as aluminum, tantalum, niobium.Additionally, the material for anode tap 12 the most specifically limits, but from anode bodies
From the viewpoint of 51 is same, valve metal is preferably used.Make compared with the situation of the powder with other valve metals such as niobium or aluminum etc.,
The mode using tantalum powder to form anode bodies 11 can obtain the electrolyte tunicle 13 of high intensity, and tantalum is therefore preferably used.
(forming the operation of electrolyte tunicle)
It follows that as shown in Fig. 4 (B), in step S2 of Fig. 3, form electrolyte tunicle 13 on the surface of anode bodies 11.
Forming method for electrolyte tunicle 13 the most specifically limits.Such as, in the case of anode bodies is made up of valve metal, logical
Cross and anode bodies 11 is carried out chemical conversion treatment, it is possible to form electrolyte tunicle 13 on the surface of anode bodies 11.As chemical conversion treatment, example
As anode portion 11 being impregnated in the forming liquid of ammonium adipate solution etc. and carry out heat treatment, or anode bodies 11 is impregnated
In forming liquid and apply voltage.By this operation, it is possible to covered the surface of anode bodies 11 by electrolyte tunicle 13.
(forming the operation of electroconductive polymer layer)
It follows that as shown in Fig. 4 (C), in step S3 of Fig. 3, electrolyte tunicle 13 forms electroconductive polymer
Layer 14.Electroconductive polymer layer 14 can be formed by chemical polymerization or electrolysis polymerization method.
The most specifically limit for being formed the method for electroconductive polymer layer 14 by chemical polymerization.For example, it is possible to
The anode bodies 11 that will be formed with electrolyte tunicle 13 is impregnated into the precursor monomer containing electroconductive polymer layer 14, oxidant, mixes
In the polymer fluid of miscellaneous dose, and on electrolyte tunicle, make precursor monomer oxidation polymerization, be consequently formed electroconductive polymer layer 14.This
Outward, it is also possible to such as after anode bodies 11 is impregnated into precursor monomer, the solution containing oxidant or adulterant it is dipped into
In.Alternatively, it is also possible to use the gas containing precursor monomer.
Additionally, the most specifically limit for being formed the method for electroconductive polymer layer 14 by electrolysis polymerization method.Such as,
Anode bodies 11 is impregnated in the electrolyte containing precursor monomer and adulterant, and on electrolyte tunicle 13, makes precursor monomer electricity
Depolymerize, be consequently formed electroconductive polymer layer 14.Additionally, it is preferred that before carrying out electrolysis polymerization method, on the surface of anode bodies 11
On pre-set the filter material layer of electric conductivity.
Precursor monomer is to become polypyrrole, polythiophene, poly-furan or the compound of polyaniline by polymerization.Need explanation
Be, in this manual, polypyrrole, polythiophene, poly-furan and polyaniline represent respectively with polypyrrole, polythiophene, poly-furan and
Polyaniline is the macromolecule of basic framework.Therefore, can comprise in polypyrrole, polythiophene, poly-furan and polyaniline respective
Derivant.Such as, as precursor monomer, it is possible to use 3,4-rthylene dioxythiophene, 3-alkylthrophene, N-methylpyrrole, N, N-
Dimethylaniline, N-alkyl benzene amine etc..
As long as oxidant can make precursor monomer be polymerized, such as, can use sulphuric acid, hydrogen peroxide, ferrum (III), copper
(II), chromium (VI), cerium (IV), manganese (VII), zinc (II) etc..Particularly, the metal described in composition and the aromatic sulphonic acid metal of salt
Salt not only has the function as oxidant, also has the function as adulterant, therefore can be preferably used.As aromatic series
Metal organic sulfonate such as can use LOMAR PWA EINECS 246-676-2 slaine, tetrahydronaphthalene metal organic sulfonate, benzene sulfonamide acid metal salt and alcoxyl
Base benzenesulfonic acid slaine.
The sulfoacid compounds such as alkyl sulfonic acid, aromatic sulphonic acid, Ppolynuclear aromatic sulfonic acid such as can be enumerated as adulterant
Acid or salt, sulphuric acid, nitric acid etc..Additionally, as set forth above, it is possible to use has the function of oxidant and the virtue of the function of adulterant
Fragrant race metal organic sulfonate.
Here, the macromolecule formed owing to electroconductive polymer layer 14 is polymerized with precursor monomer is for substantially being constituted, therefore
It is not formed uniformly on the electrolyte tunicle 13 on the surface of anode bodies 11 in irregular shape, but there is Fig. 5 institute
The state in the space 22 shown is formed.Therefore, electrolyte tunicle 13 produces the part not covered by electroconductive polymer layer 14
I.e. electroconductive polymer layer 14 and electrolyte tunicle 13 not in contact with part.
In the case of the anode bodies 11 of solid electrolytic capacitor exists above-mentioned space 22, such as at this solid electrolytic electricity
When container is placed in the environment of high humility, outside moisture is impregnated with to the inside of solid electrolytic capacitor and spreads and arrive
Space 22, thus directly contacts with electrolyte tunicle 13.When moisture directly contacts with electrolyte tunicle 13, space 22 becomes tool
There is power reservoir capacity, as a result of which it is, apparent electrode area increases, thus cause the capacity of solid electrolytic capacitor to increase.Cause
This, in the present embodiment, carry out below step S4.
(forming the operation in waterproof portion)
In step S4 of Fig. 3, silicone oil is made to be impregnated with the space 22 of Fig. 5, as in figure 2 it is shown, form waterproof portion 21.Waterproof portion 21
Can be impregnated in silicone oil formed by such as will be formed with the anode bodies 11 of electroconductive polymer layer 14.
Waterproof portion 21 can be formed in space 22 by being filled into by silicone oil, or can also be by being covered by silicone oil
Formed on the surface of the electrolyte tunicle 13 not connected with electroconductive polymer layer 14.Especially, waterproof portion 21 is by inciting somebody to action
Silicone oil is filled in space 22 mode formed can more efficiently prevent being impregnated with from outside moisture, the most preferably should
Mode.
Silicone oil preferred degree of polymerization is the oligomer of less than more than 2 2000.Wherein, preferably straight-chain silicone oil, cyclic silicone oils, also
Alkyl, such as methyl can be combined on silicon (Si) atom in the molecule.As concrete cyclic silicone oils, the most such as decamethyl
Cyclopentasiloxane, dodecamethylcyclohexasiloxane, ten tetramethyl cycloheptyl siloxanes etc..Additionally, as concrete straight-chain silicone oil
Preferably, decamethyl tetrasiloxane, ten dimethyl five siloxanes, tetradecamethylhexasiloxane etc..
As long as any one in above-mentioned silicone oil, it becomes possible to be impregnated with the space 22 of electroconductive polymer layer 14.This be because of
Molecular weight for above-mentioned silicone oil is smaller.Additionally, by make above-mentioned silicone oil be impregnated with space 22 formed waterproof portion 21 can be because of silicon
Oil water proofing property and there is high water proofing property.Additionally, the most more preferably use decamethylcyclopentasiloxane as silicone oil.This be because of
For, in above-mentioned silicone oil, the relatively thing physics of the characteristic of low molecular decamethylcyclopentasiloxane, such as viscosity and fusing point etc. is special
Property is for being preferred for being impregnated with of electric conductivity macromolecule layer 14.
In addition it is also possible to by silicone oil and solvent when the mixed liquor of mixing to the space of electric conductivity macromolecule layer 14
22 are impregnated with.In this case, silicone oil lowering of concentration in mixed liquor makes silicone oil not coagulation become scattered state, because of
This can make silicone oil be impregnated with to electric conductivity macromolecule layer 14 efficiently.Therefore, it is possible to form waterproof portion to space 22 more reliably
21.As solvent, such as, can suitably use isopropyl myristate, isopropyl palmitate, propylene glycol monomethyl ether
Deng ester series solvent, the alcohol series solvent of ethanol etc..It should be noted that this solvent is in the manufacturing process of solid electrolytic capacitor
It is removed by heat treated.
(forming the operation of cathode layer)
It follows that in the step 5 of Fig. 3, as shown in Fig. 4 (D), such as form carbon-coating 15 and silver coating as cathode layer
16。
Carbon-coating 15 and the respective forming method of silver coating 16 are the most specifically limited, can be according to known technology shape
Become.Such as, carbon-coating 15 can be impregnated into be dispersed with carbon particle by will be formed with the anode bodies 11 of electroconductive polymer layer 14
In solution, then it is dried process and is formed.Additionally, silver coating 16 can pass through this anode bodies 11 after forming carbon-coating 15
To the solution impregnation containing silver particles and carry out dried and formed.Capacitor element 10 is made by above operation.
(operation of sealed capacitor element)
It follows that as shown in Fig. 4 (E), in step S6 of Fig. 3, sealed capacitor element 10 and manufacture solid electrolytic electricity
Container.Method for sealing the most specifically limits, such as, there is following method.
I.e., first, anode terminal 17 is connected with one end exposed of anode tap 12, silver coating 16 is formed bonding
Layer 18 and connect one end of cathode terminal 19.Material for anode terminal 17 and cathode terminal 19 the most specifically limits, only
Want to turn on, such as, can use copper, copper alloy etc..It addition, the material for adhesive linkage 18 the most specifically limits,
As long as having electric conductivity and cementability.
It follows that by exterior resin 20 in the way of making anode terminal 17 and the respective other end of cathode terminal 19 expose
Sealed capacitor element 10.Material for exterior resin 20 the most specifically limits, but preferably insulator, such as can make
Use epoxy resin.Finally, the anode terminal 17 exposed and cathode terminal 19 are carried out aging place along the bending of exterior resin 20
Reason, thus manufactures the solid electrolytic capacitor shown in Fig. 2 (E).
The manufacture method of the solid electrolytic capacitor according to above-mentioned embodiment 1, in electrolyte tunicle 13 not with
The waterproof portion 21 containing silicone oil is formed on the electrolyte tunicle 13 of electroconductive polymer layer 14 contact.That is, not by electric conductivity high score
The electrolyte tunicle 13 that sublayer 14 covers is covered by waterproof portion 21.
Thus, the solid electrolytic capacitor manufactured by embodiment 1 is had: anode bodies 11, covering anode bodies 11 surface
Electrolyte tunicle 13, the electroconductive polymer layer 14 being arranged on electrolyte tunicle 13, be arranged on not with electroconductive polymer
The waterproof portion 21 containing silicone oil on the electrolyte tunicle 13 of layer 14 contact.
According to said structure, owing to electrolyte tunicle 13 can be suppressed and is impregnated into solid electrolytic capacitor from outside
Moisture directly contacts, therefore, it is possible to the capacity of solid electrolytic capacitor that causes because of contact with moisture electrolyte tunicle 13 of suppression
Increase.Especially, between waterproof portion 21 and electrolyte tunicle 13, there is not other components, waterproof portion 21 and electrolyte tunicle 13
Directly contact, it is possible to more effectively to suppress contacting of electrolyte tunicle 13 and moisture.
Additionally, in the case of using sintered body as anode bodies 11, had as the anode bodies 11 of porous plastid
The size in hole is less, additionally, it is shaped so as to the shape of complexity.So, the anode bodies 11 being made up of sintered body has on surface
There is the recess of complexity, therefore exist and be more difficult to be formed uniformly electric conductivity high score on the electrolyte tunicle 13 covering anode bodies 11
The tendency of sublayer 14.Additionally, due to this recess is trickle, material and the material of high molecular that therefore viscosity is high are more difficult to recess
Inside is impregnated with.
In contrast, in embodiment 1, owing to using the silicon as the oligomer that the degree of polymerization is less than more than 2 2000
Oil, therefore, it is possible to be impregnated with silicone oil in trickle recess.Thus, in the case of being constituted anode bodies 11 by sintered body, it is also possible to
The electrolyte tunicle 13 not contacted with electroconductive polymer layer 14 is formed waterproof portion 21, it is possible to suppress because of moisture and electricity
The increase of the capacity of the solid electrolytic capacitor that medium tunicle 13 contacts and causes.Thus, solid electrolytic capacitor can be suppressed
Volume change, it is possible to manufacture the solid electrolytic capacitor that reliability is high.
<embodiment 2>
" manufacture method of solid electrolytic capacitor "
Fig. 6 is the system of the solid electrolytic capacitor of the embodiment 2 of another example of the manufacture method being denoted as the present invention
Make the flow chart of an example of method.Hereinafter, use Fig. 2, Fig. 4 and Fig. 6 that the manufacture of solid electrolytic capacitor of embodiment 2 is described
Method.
(forming the operation of anode bodies)
First, as shown in Fig. 4 (A), form anode bodies 11 in step s in fig. 6.This operation and the step of embodiment 1
S1 is same, does not the most repeat its explanation.
(forming the operation of electrolyte tunicle)
It follows that as shown in Fig. 4 (B), form electrolyte tunicle 13 on the surface of anode bodies 11.This operation and embodiment
Step S2 of 1 is same, does not the most repeat its explanation.
(forming the operation of electroconductive polymer layer)
It follows that as shown in Fig. 4 (C), in step S3 of Fig. 6, form electric conductivity on the surface of electrolyte tunicle 13 high
Molecular layer 14.This operation, as step S3 of embodiment 1, does not the most repeat its explanation.
(forming the operation of cathode layer)
It follows that as shown in Fig. 4 (D), in step S5 of Fig. 6, form such as carbon-coating 15 and silver coating as cathode layer
16.This operation, as step S5 of embodiment 1, does not the most repeat its explanation.
(forming the operation in waterproof portion)
It follows that as in figure 2 it is shown, form waterproof portion 21 in step S4 of Fig. 6.Waterproof portion 21 such as can be by such as
Will be formed with the anode bodies 11 of electroconductive polymer layer 14 to be impregnated in silicone oil and formed.
As it has been described above, it is high to produce the i.e. electric conductivity of the part not covered by electroconductive polymer layer 14 on electrolyte tunicle 13
Molecular layer 14 and electrolyte tunicle 13 not in contact with part.Therefore, after forming carbon-coating 15 and silver coating 16, by anode bodies 11 to
Above-mentioned silicone oil impregnates, thus is formed on the surface not contacted with electroconductive polymer layer 14 in the surface of electrolyte tunicle 13
Waterproof portion 21 containing silicone oil.
As it has been described above, the structure in waterproof portion 21 is configured to be filled in space 22 silicone oil, it is also possible to be configured to make silicone oil
Cover on the surface of the electrolyte tunicle 13 not connected with electroconductive polymer layer 14.Particularly it is filled into space 22 at silicone oil
In in the case of this state, it is possible to more efficiently prevent being impregnated with, the most preferably from outside moisture.
(operation of sealed capacitor element)
It follows that as shown in Fig. 4 (E), sealed capacitor element 10 in step S6 of Fig. 6 and manufacture solid electrolytic capacitor
Device.This operation, as step S6 of embodiment 1, does not the most repeat its explanation.
The manufacture method of the solid electrolytic capacitor according to above-mentioned embodiment 2, in electrolyte tunicle 13 not with
The waterproof portion 21 containing silicone oil is formed on the electrolyte tunicle 13 of electroconductive polymer layer 14 contact.That is, not by electric conductivity high score
The electrolyte tunicle 13 that sublayer 14 covers is covered by waterproof portion 21.
Thus, the solid electrolytic capacitor manufactured by embodiment 2 can be had: anode bodies 11, covering anode bodies 11
The electrolyte tunicle 13 on surface, the electroconductive polymer layer 14 being arranged on electrolyte tunicle 13, be arranged on not with electric conductivity
Waterproof portion 21 on the electrolyte tunicle 13 of macromolecule layer 14 contact and containing silicone oil.
By said structure, owing to electrolyte tunicle 13 can be suppressed and is impregnated into solid electrolytic capacitor from outside
Moisture directly contacts, therefore, it is possible to the capacity of solid electrolytic capacitor that causes because of contact with moisture electrolyte tunicle 13 of suppression
Increase.Especially, between waterproof portion 21 and electrolyte tunicle 13, there is not other components, waterproof portion 21 and electrolyte tunicle 13
Directly contact, it is possible to more effectively to suppress contacting of electrolyte tunicle 13 and moisture.
Additionally, in the case of using sintered body as anode bodies 11, had as the anode bodies 11 of porous plastid
The size in hole is less, additionally, it is shaped so as to the shape of complexity.So, the anode bodies 11 being made up of sintered body is from the teeth outwards
There is the recess of complexity, therefore exist and be more difficult on the electrolyte tunicle 13 covering anode bodies 11, be formed uniformly electric conductivity height
The tendency of molecular layer 14.Additionally, due to this recess is trickle, material and the material of high molecular that therefore viscosity is high are more difficult to recessed
It is impregnated with inside portion.
In contrast, in embodiment 2, owing to using the silicon as the oligomer that the degree of polymerization is less than more than 2 2000
Oil, therefore, it is possible to be impregnated with silicone oil in trickle recess.Thus, in the case of being constituted anode bodies 11 by sintered body, it is also possible to
The electrolyte tunicle 13 not contacted with electroconductive polymer layer 14 is formed waterproof portion 21, thereby, it is possible to suppression because of moisture with
The increase of the capacity of the solid electrolytic capacitor that electrolyte tunicle 13 contact causes.Thus, solid electrolytic capacitor can be suppressed
Volume change, it is possible to manufacture the solid electrolytic capacitor that reliability is high.
Explanation other than the above in present embodiment 2, as embodiment 1, does not the most repeat its explanation.
Additionally, in present embodiment 2, after forming carbon-coating 15 and silver coating 16, form waterproof portion 21, but self-evident
Be, it is also possible to form waterproof portion 21 being formed after carbon-coating 15.
The present invention is not limited to the solid electrolytic capacitor of Fig. 1.Such as, in the solid electrolytic capacitor of backrush type, sun
Polar body is metal forming, and its surface is by extended surface, and in the solid electrolytic capacitor of cascade type, anode bodies is metallic plate, its surface
By extended surface.Thus, in described solid electrolytic capacitor, the electrolyte tunicle of anode body surface is difficult to electric conductivity
Macromolecule layer uniformly in contact with mode form electroconductive polymer layer.Therefore, at solid electrolytic capacitor and the layer of backrush type
In the solid electrolytic capacitor of stack-type, by arranging waterproof portion on the electrolyte tunicle not contacted with electroconductive polymer layer,
It is thus possible to suppress the increase of the capacity of the solid electrolytic capacitor caused because moisture contacts with electrolyte tunicle.
Example
Hereinafter, enumerate embodiment and further describe the present invention, but the present invention is not limited to this.
<embodiment 1>
In the present embodiment 1, make the solid electrolytic capacitor of the structure shown in Fig. 1.Hereinafter, to solid electrolytic capacitor
The concrete manufacture method of device illustrates.
First, prepare tantalum powder, the end side of the length direction of the claval anode tap being made up of tantalum is being imbedded
Under the state of metal dust, tantalum powder is configured to cuboid.Further, sinter this formed body, thus formation is embedded with anode and draws
The anode bodies of the porous structure of one end of line.
It follows that be impregnated in forming liquid by above-mentioned anode bodies, and anode tap is applied voltage, thus anode bodies is entered
Row chemical conversion treatment.Thus, the surface of anode bodies is formed by Ta2O5The electrolyte tunicle constituted.
It follows that use electrolysis polymerization method to form electroconductive polymer layer on electrolyte tunicle.Specifically, first,
To the solution impregnation anode bodies containing oxidant, after being drawn off be dried, then make its with as electroconductive polymer layer before
The pyrroles of body monomer contacts and forms the filter material layer of electric conductivity.It follows that impregnate shape to the electrolyte containing pyrroles and adulterant
Become to have the anode bodies of filter material layer, make precursor monomer electrolysis polymerization, on electrolyte tunicle, thus form electroconductive polymer.
It follows that will be formed with the anode bodies of electroconductive polymer layer to decamethylcyclopentasiloxane and propylene glycol monomethyl ether
The mixed liquor dipping of acetas.This anode bodies is taken out and puts it into electric furnace with 100 DEG C of heating, thus remove solvent.Thus
Form waterproof portion.It should be noted that the combined amount of the decamethylcyclopentasiloxane in mixed liquor is relative to propylene glycol monomethyl ether
The amount of solution of acetas is 5 capacity %.
It follows that by anode bodies to being dispersed with the solution impregnation of carbon particle, then form carbon-coating by dried, connect down
Come, this anode bodies is formed silver coating to the solution impregnation containing silver particles by dried.By above process system
Make capacitor element.
It follows that one end that the anode terminal being made up of copper is exposed with anode tap is connected, silver coating is formed
Adhesive linkage and one end of cathode terminal of constituting with by copper are connected.It follows that so that anode terminal and cathode terminal are respective separately
The mode that one end is exposed is by the exterior resin seal capacitor element being made up of epoxy resin.Further, the anode tap that will expose
Son and cathode terminal are along exterior resin bending, thus manufacture the capacitor element of this structure shown in Fig. 1.The solid manufactured
Longitudinal direction × laterally × the height that is shaped as of electrolysis condenser is 7.3mm × 4.3mm × 1.8mm.
<embodiment 2>
In the operation forming waterproof portion, except using the mixing of decamethyl tetrasiloxane and propylene glycol methyl ether acetate
Beyond liquid, method similarly to Example 1 is utilized to manufacture solid electrolytic capacitor.Manufacture solid electrolytic capacitor shape with
The solid electrolytic capacitor of embodiment 1 is same.It should be noted that the combined amount of decamethyl tetrasiloxane in mixed liquor is relative
Amount of solution in propylene glycol methyl ether acetate is 5 capacity %.
<comparative example 1>
In addition to not carrying out being formed the operation in waterproof portion, method similarly to Example 1 is utilized to manufacture solid electrolytic electricity
Container.The shape of the solid electrolytic capacitor manufactured is as the solid electrolytic capacitor of embodiment 1.
<comparative example 2>
In addition to replacing the operation forming waterproof portion and carry out following operation, utilize method system similarly to Example 1
Making solid electrolytic capacitor, described operation is, anode bodies is impregnated into polysiloxanes and propylene glycol that the degree of polymerization is about 5000
In the mixed liquor of methyl ether acetate, this anode bodies is taken out and puts it in electric furnace with 100 DEG C of heating.The solid electricity manufactured
The shape of electrolysis condenser is as the solid electrolytic capacitor of embodiment 1.It should be noted that polysiloxanes in mixed liquor
Combined amount is 5 capacity % relative to the amount of solution of propylene glycol methyl ether acetate.
<performance evaluation>
(1) initial capacity of solid electrolytic capacitor
Determine the capacity (μ F) of the solid electrolytic capacitor of embodiment 1,2 and comparative example 1,2.Specifically, four are used
The LCR measurement table of terminals measurement determines each solid electrolytic capacitor capacity (μ F) under frequency 120Hz.
(2) capacity of the solid electrolytic capacitor after reliability test
After above-mentioned solid measure, the solid electrolytic capacitor of embodiment 1,2 and comparative example 1,2 is carried out reliability examination
Test.That is, each solid electrolytic capacitor is placed on temperature be 60 DEG C, humidity be within 50 hours, to force to make it inhale in the environment of 90 ‰
Wet.
Further, use the LCR measurement table of four terminals measurement to each embodiment after reliability test and each comparative example
Solid electrolytic capacitor determines each solid electrolytic capacitor capacity (μ F) when frequency 120Hz.Above result is in Table 1
Illustrate.
Table 1
In Table 1, " initial capacity (μ F) " represents the capacity of each solid electrolytic capacitor after just manufacturing." reliability is tried
Capacity (μ F) after testing " represent the capacity of each solid electrolytic capacitor after above-mentioned reliability test." Capacitance Shift Rate (%) "
It is that the capacity (μ F) after the reliability test of each solid electrolytic capacitor is multiplied by 100 divided by the value after initial capacity (μ F) and obtains
The value arrived.
Understand with reference to table 1, the solid electrolytic capacitor of embodiment 1 and 2 compared with the solid electrolytic capacitor of comparative example 1
Before and after reliability test, the variation of capacity is little.It follows that be formed with the anode of electroconductive polymer layer by making silicone oil be impregnated with
Body, thus improve the reliability of solid electrolytic capacitor.
Also knowing that, compared with the solid electrolytic capacitor of comparative example 2, the solid electrolytic capacitor of embodiment 1 and 2 is reliably
Property test before and after capacity variation little.This is because, the molecular weight of polysiloxanes is big, it is impossible to enter trickle sky as described above
Gap.
Claims (10)
1. a solid electrolytic capacitor, it has:
Anode bodies；
Electrolyte tunicle, it covers the surface of described anode bodies；
Electroconductive polymer layer, it is arranged on described electrolyte tunicle；
Waterproof portion, it is arranged on the described electrolyte tunicle not contacted with described electroconductive polymer layer, and by described conduction
Property macromolecule layer and described electrolyte be surrounded by film, and containing silicone oil.
Solid electrolytic capacitor the most according to claim 1, wherein,
Described silicone oil be the degree of polymerization be the oligomer of less than more than 2 2000.
Solid electrolytic capacitor the most according to claim 1, wherein,
Described silicone oil is by from decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, ten tetramethyl cycloheptyl siloxanes, decamethyl
At least one composition that the group of tetrasiloxane, ten dimethyl five siloxanes, tetradecamethylhexasiloxane composition is selected.
Solid electrolytic capacitor the most according to claim 1, wherein,
Described anode bodies has recess on surface, and described waterproof portion is arranged on the described electrolyte tunicle covering described recess.
Solid electrolytic capacitor the most according to claim 1, wherein,
Described anode bodies is made up of the sintered body of metal.
6. a manufacture method for solid electrolytic capacitor, comprising:
The operation of electrolyte tunicle is formed on the surface of anode bodies；
Described electrolyte tunicle is formed the operation of electroconductive polymer layer；
Described electroconductive polymer layer is formed the operation of cathode layer,
After the operation at least forming described electroconductive polymer layer, have and be situated between by described electroconductive polymer layer and described electricity
The space that matter is surrounded by film impregnates silicone oil, is consequently formed the operation in waterproof portion.
The manufacture method of solid electrolytic capacitor the most according to claim 6, wherein,
Described silicone oil be the degree of polymerization be the oligomer of less than more than 2 2000.
The manufacture method of solid electrolytic capacitor the most according to claim 6, wherein,
Described silicone oil is by from decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, ten tetramethyl cycloheptyl siloxanes, decamethyl
At least one composition that the group of tetrasiloxane, ten dimethyl five siloxanes, tetradecamethylhexasiloxane composition is selected.
The manufacture method of solid electrolytic capacitor the most according to claim 6, wherein,
The operation forming described waterproof portion includes making described silicone oil be impregnated with to the described anode bodies being formed with described electrolyte tunicle
Operation.
The manufacture method of solid electrolytic capacitor the most according to claim 6, wherein,
After the operation forming described cathode layer, there is the operation forming described waterproof portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-266525 | 2010-11-30 | ||
| JP2010266525A JP2012119427A (en) | 2010-11-30 | 2010-11-30 | Solid electrolytic capacitor and method of manufacturing the same |
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| Publication Number | Publication Date |
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| CN102479620A CN102479620A (en) | 2012-05-30 |
| CN102479620B true CN102479620B (en) | 2016-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349653A (en) * | 1999-04-30 | 2002-05-15 | 昭和电工株式会社 | Solid electrolytic capacitor and method for producing the same |
| US6483694B1 (en) * | 1999-06-22 | 2002-11-19 | Showa Denko Kabushiki Kaisha | Electrode for electrolytic capacitor, electrolytic capacitor, and manufacturing method therefor |
| CN101060040A (en) * | 2006-04-21 | 2007-10-24 | 三洋电机株式会社 | Stacked solid electrolytic capacitor and manufacturing method thereof |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349653A (en) * | 1999-04-30 | 2002-05-15 | 昭和电工株式会社 | Solid electrolytic capacitor and method for producing the same |
| US6483694B1 (en) * | 1999-06-22 | 2002-11-19 | Showa Denko Kabushiki Kaisha | Electrode for electrolytic capacitor, electrolytic capacitor, and manufacturing method therefor |
| CN101060040A (en) * | 2006-04-21 | 2007-10-24 | 三洋电机株式会社 | Stacked solid electrolytic capacitor and manufacturing method thereof |
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