WO2005062320A1 - 電気化学キャパシタ、電気化学キャパシタ用電極の製造方法及び電気化学キャパシタ用電極の製造装置 - Google Patents
電気化学キャパシタ、電気化学キャパシタ用電極の製造方法及び電気化学キャパシタ用電極の製造装置 Download PDFInfo
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- WO2005062320A1 WO2005062320A1 PCT/JP2004/019712 JP2004019712W WO2005062320A1 WO 2005062320 A1 WO2005062320 A1 WO 2005062320A1 JP 2004019712 W JP2004019712 W JP 2004019712W WO 2005062320 A1 WO2005062320 A1 WO 2005062320A1
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- WIPO (PCT)
- Prior art keywords
- current collector
- polarizable electrode
- electrode
- electrochemical capacitor
- layer
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/006—Apparatus or processes for applying terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
- H01G11/12—Stacked hybrid or EDL capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Definitions
- Electrochemical capacitor Description Electrochemical capacitor, method for manufacturing electrode for electrochemical capacitor, and apparatus for manufacturing electrode for electrochemical capacitor
- the present invention relates to an electrochemical capacitor, and more particularly, to an electrochemical capacitor having an electrode provided with an undercoat layer.
- the present invention relates to a method for manufacturing an electrode for an electrochemical capacitor and an apparatus for manufacturing an electrode for an electrochemical capacitor, and more particularly to a method for manufacturing an electrode for an electrochemical capacitor capable of controlling the formation position of a polarizable electrode layer with high accuracy, and an electrochemical method.
- the present invention relates to an apparatus for manufacturing a capacitor electrode.
- Electrochemical capacitors such as electric double layer capacitors can be easily reduced in size and weight.
- power supplies for backing up power supplies for portable equipment (small electronic equipment), electric vehicles and hybrid vehicles It is expected to be used as an auxiliary power source, etc., and various studies are being made to improve its performance.
- Electrochemical capacitors usually have a stacked structure in which a separator is sandwiched between electrodes (electrodes for electrochemical capacitors) including a current collector and a polarizable electrode layer formed thereon.
- electrodes electrodes for electrochemical capacitors
- a separator When a large capacity is required like a power supply, it is common to employ a structure in which a large number of these electrodes are stacked via a separator (see Patent Documents 1 and 2).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-250742
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-284 184
- the area of the polarizable electrode layer should be set as large as possible to increase the capacity of the electrochemical capacitor. preferable.
- a part of the current collector is sometimes used as an extraction electrode.
- the extraction electrode may be used. Lack of available area makes assembly of electrochemical capacitors difficult. Therefore, in order to secure as large a capacity as possible without impairing the ease of assembly, it is important to control the position of the polarizable electrode layer on the current collector with high precision. .
- an electrode used in an electrochemical capacitor may be provided with an undercoat layer as an adhesive layer between the current collector and the polarizable electrode layer in order to increase the adhesive strength between the current collector and the polarizable electrode layer.
- an undercoat layer a material having high conductivity is generally used to prevent an increase in resistance value. Since the undercoat layer is a layer for adhering the current collector layer and the polarizable electrode layer, the area where the undercoat layer is provided is the same as the area where the polarizable electrode layer is provided, or it must be set wider. There is.
- an object of the present invention is to provide an electrochemical capacitor in which a short circuit via an undercoat layer is prevented.
- the electrochemical capacitor of the present invention comprises a current collector, a polarizable electrode layer, and the current collector.
- First and second electrodes each including an undercoat layer for bonding the polarizable electrode layer, and a separator sandwiched between the first and second electrodes such that the polarizable electrode layers face each other.
- the ends of the undercoat layer are located on the same or outer side as the ends of the corresponding polarizable electrode layers, respectively, and both are located on the inner side than the ends of the separator. It is characterized by having.
- the end of the undercoat layer since the end of the undercoat layer is located on the same or outer side as the end of the polarizable electrode layer, an undercoat layer must be provided between the polarizable electrode layer and the current collector. Will exist. Thereby, the possibility that the polarizable electrode layer is peeled off from the current collector is extremely reduced. Moreover, since the end of the undercoat layer is located inside the end of the separator, the undercoat layer included in the first electrode and the undercoat layer included in the second electrode are located between the undercoat layer and the second electrode. Will always have a separator interposed. Thus, the undercoat layers do not come into contact with each other, and the undercoat layer of one electrode does not come into contact with the current collector of the other electrode. As described above, since peeling of the polarizable electrode layer and occurrence of short circuit are effectively prevented, high reliability can be ensured. The above condition is preferably satisfied at all ends (entire outer circumferences) of the first and second electrodes.
- each of the current collectors has a lead electrode, and the end of the separator is located inside the end of the lead electrode. According to this, the separator does not hinder the connection between the extraction electrode and the external circuit. Also, when a shim is interposed between a plurality of extraction electrodes having the same potential, the shim and the undercoat layer are less likely to interfere with each other, and the shape of the entire electrochemical capacitor can be maintained correctly.
- the distance between the end of the undercoat layer and the end of the corresponding polarizable electrode layer is 0.5 mm or less. This is because when the above distance exceeds 0.5 mm, the area of the polarizable electrode layer is reduced more than necessary, and as a result, the capacity is reduced.
- An electrochemical capacitor includes a plurality of separators, and a plurality of first and second electrodes alternately arranged via the separator.
- the first and second electrodes are a current collector having an extraction electrode, a polarizable electrode layer provided on both surfaces of the current collector, and an undercoat layer for bonding the current collector and the polarizable electrode layer.
- the end of the undercoat layer is located at the same or outer side as the end of the corresponding polarizable electrode layer, and both are located more inside than the end of the separator. It is characterized by the following. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to implement
- a shim is further provided between the plurality of extraction electrodes included in the first electrode and between the plurality of extraction electrodes included in the second electrode. Even when such a shim is provided, in the present invention, the shim and the undercoat layer hardly interfere with each other, and as a result, the shape of the entire electrochemical capacitor can be correctly maintained.
- an uncoated region is left on at least one end in the width direction of the current collector on the strip-shaped current collector conveyed in the length direction.
- the feed pack control is performed on the coating process so that the boundary position is a predetermined position, the formation position of the polarizable electrode layer can be controlled with high accuracy. As a result, even when a part of the current collector is used as a lead electrode, it is possible to secure as large a capacity as possible without impairing the ease of assembly.
- the polarizable electrode layer is applied so that an uncoated area is left at both ends in the width direction of the current collector, and the feedback control is applied to both of the uncoated areas.
- the widths are substantially matched. According to this, both the uncoated area can be used as a lead electrode so that the current collector and the polarizable electrode layer can be used. Even when the laminated body is punched out, the width of each extraction electrode of the extracted electrode for electrochemical capacitor can be made substantially constant.
- An apparatus for manufacturing an electrode for an electrochemical capacitor according to the present invention includes a conveying unit configured to convey a belt-shaped current collector in a length direction, and an uncoated region is left at at least one end in a width direction of the current collector.
- An electrode application unit for applying a polarizable electrode layer having a predetermined width on the current collector; and a detection unit for detecting a boundary position between the application region of the polarizable electrode layer and the uncoated region on the current collector.
- the electrode applying means applies the polarizable electrode layer on the current collector so that an uncoated area is left at both ends in the width direction of the current collector. According to this, a laminate of the current collector and the polarizable electrode layer can be punched out so that both uncoated regions can be used as extraction electrodes.
- the apparatus for producing an electrode for an electrochemical capacitor according to the present invention is provided on the upstream side of the electrode coating means, and an uncoated region of the undercoat layer is left at least at one end in the width direction of the current collector.
- the apparatus further comprises an undercoat applying means for applying an undercoat layer having a predetermined width on the current collector, wherein the undercoat layer has a coating area on the current collector and an undercoat layer.
- another detecting means for detecting a boundary position with the uncoated area and another driving means for driving the undercoat applying means in a width direction of the current collector.
- the other driving unit is feedback-controlled based on the detection result of the boundary position by the detecting unit.
- the electrode coating unit may apply the polarizable electrode layer on the application region of the undercoat layer without applying the polarizable electrode layer to the uncoated region of the undercoat layer.
- the positional relationship between the polarizable electrode layer and the undercoat layer Can also be controlled with high precision, so that the polarizable electrode layer does not peel off and short-circuit failure does not occur through the undercoat layer.
- the formation position of the polarizable electrode layer is feedback-controlled based on the detected boundary position, the formation position of the polarizable electrode layer can be controlled with high accuracy. As a result, even when a part of the current collector is used as an extraction electrode, it is possible to secure as large a capacity as possible without impairing the ease of assembly. In addition, when the undercoat layer is used, peeling of the polarizable electrode layer does not occur, and short-circuit failure does not occur through the undercoat layer. [Brief description of drawings]
- FIG. 1 is an exploded perspective view showing a state before assembly of an electrochemical capacitor 100 according to a preferred embodiment of the present invention.
- FIG. 2 is a partial cross-sectional view showing a part of an electrochemical capacitor 100 in an enlarged manner.
- FIG. 3 is a partial cross-sectional view when 0 ⁇ a 1 is not satisfied and 0> a 1 is satisfied.
- FIG. 4 A partial cross-sectional view when a1 and a2 are not satisfied and a1 ⁇ a2.
- FIG. 5 is a view for explaining a method of forming an undercoat layer 113, 123 and a polarizing electrode layer 112, 122 on the surface of a current collector sheet 140. .
- FIG. 6 is a view for explaining a method of extracting an electrode from a current collector sheet 140.
- FIG. 7 An electrochemical capacitor 200 according to another preferred embodiment of the present invention.
- FIG. 7 An electrochemical capacitor 200 according to another preferred embodiment of the present invention.
- FIG. 8 is a partial cross-sectional view of an electrochemical capacitor 200 in a laminated state.
- FIG. 9 is a view showing a state in which the undercoat layers 2 14 and 2 15 and the shim 2 11 b interfere with each other because of a l> a 2.
- FIG. 10 is a schematic view showing the structure of a manufacturing apparatus 110 for an electrode for an electrochemical capacitor according to a preferred embodiment of the present invention.
- FIG. 11 is a schematic diagram for explaining a method for preparing a coating solution L1.
- FIG. 12 is a schematic perspective view showing, in an enlarged manner, the vicinity of an application unit 110.
- FIG. 13 is a view for explaining a method of cutting out an electrode for electrochemical capacitor 100 from a laminate 100 20.
- FIG. 13A shows a laminate cut to a predetermined size.
- FIG. 13 (b) is a schematic plan view of a laminate 10020 from which an electrode for electrochemical capacitor 110 is cut out, and
- FIG. c) is a schematic plan view of the cut-out electrode 11010 for an electrochemical capacitor.
- FIG. 14 is a schematic diagram for explaining a method for producing an electrochemical capacitor using the electrode for electrochemical capacitor 100.
- FIG. 15 Method of cutting out electrodes for electrochemical capacitors by punching out laminates so that both uncoated areas can be used as extraction electrodes
- FIG. 16 is a schematic diagram for explaining a method of forming an undercoat layer 107 and a polarizable electrode layer 110 18 on the surface of a current collector 110 16.
- FIG. 17 is a view for explaining a method of extracting an electrode from a laminate 100 20 including an undercoat layer 107.
- FIG. 18 is a schematic diagram for explaining a method of producing an electrochemical capacitor using the electrode for electrochemical capacitor 1030.
- FIG. 6 is a partial cross-sectional view showing a state where 0s are stacked.
- FIG. 20 Substantially disassembly and breakage of an electrochemical capacitor having a plurality of electrodes in which an undercoat layer 107 and a polarizable electrode layer 110 18 are formed on both surfaces of a current collector 110 16 It is a front view
- FIG. 1 is an exploded perspective view showing a state before assembly of an electrochemical capacitor 100 according to a preferred embodiment of the present invention.
- the electrochemical capacitor 100 includes a first electrode 110, a second electrode 120, and the first and second electrodes 110, 1 As a main element, a separator 130 sandwiched between 20 is included.
- the first electrode 110 includes a current collector 111, a polarizing electrode layer 112, and an undercoat layer 113 provided between the current collector 111 and the current collector 111. Is provided with a lead electrode 111a.
- the second electrode 120 is composed of a current collector 121, a polarizable electrode layer 122, and an undercoat layer 123 provided therebetween, 21 is provided with a lead electrode 1 2 1a.
- the separator 130 has the first electrode 110 and the second electrode 120 arranged so that the polarizable electrode layer 112 and the polarizable electrode layer 122 face each other. Sandwiched between.
- the separator 130 is sandwiched between the first and second electrodes 110 and 120, and then housed in a case (not shown), and the case is filled with an electrolyte solution. It is completed by doing.
- the capacitor functions as a capacitor having the extraction electrode 111a as one terminal and the extraction electrode 121a as the other terminal.
- the material of the current collectors 111 and 122 is not particularly limited as long as it is a good conductor capable of sufficiently transferring charges to the polarizable electrode layers 112 and 122, respectively.
- the current collector material used for the electrochemical capacitor of the above for example, aluminum (A 1) can be used.
- the thickness of the current collectors 111 and 121 is also not particularly limited, but in order to further reduce the size of the electrochemical capacitor, sufficient mechanical strength is required. It is preferable to set as thin as possible within the limit secured.
- the thickness is preferably set to 20 / im or more and 50 ⁇ or less, and 20 ⁇ m As described above, it is more preferable to set it to 30 ⁇ or less.
- the polarizable electrode layers 112, 122 are layers formed on 111, 121, respectively, and contribute to charge storage and discharge.
- the polarizable electrode layers 112, 122 contain at least porous particles having electron conductivity as a constituent material thereof and a binder capable of binding the porous particles.
- the content of the porous particles in the polarizable electrode layers 112 and 122 is 84 to 92% by mass based on the total amount of the polarizable electrode layers 112 and 122.
- the content of the binder is preferably 6.5 to 16% by mass based on the total amount of the polarizable electrode layers 112 and 122.
- the total amount 84 to 92% by weight of the porous particles, 6.5 to 1 6% by weight of the electron conduction of the binder and ⁇ 1. 5 mass 0/0 It is preferable to use a conductive auxiliary agent having a property.
- the porous particles contained in the polarizable electrode layers 112 and 122 are not particularly limited as long as they are porous particles having electron conductivity that contributes to charge storage and discharge.
- Activated carbon in the form of activated carbon As these activated carbons, phenol-based activated carbon, coconut palm activated carbon, and the like can be used.
- the average particle size of the porous particles is preferably 3 to 20 ⁇ , and the BET specific surface area determined from the nitrogen adsorption isotherm using the ⁇ ⁇ ⁇ isotherm is preferably 1500 m 2 / g or less. Above, more preferably 2000 to 2500 m 2 Zg. If such porous particles are used, a high volume capacity can be obtained.
- the binder contained in the polarizable electrode layers 112 and 122 is not particularly limited as long as it is a binder capable of binding the porous particles.
- a binder capable of binding the porous particles For example, polytetrafluoroethylene (PTFE), polyvinyl fluoride Liden (PVDF), polyethylene (PE), polypropylene (PP), fluoro rubber, etc. can be used. These Among them, it is particularly preferable to use fluororubber. This is because the use of fluororubber makes it possible to sufficiently bind the porous particles even with a small content, thereby improving the coating strength of the polarizable electrode layers 112, 122. At the same time, the size of the double layer interface is improved, and the volume capacity can be improved.
- fluorine rubber examples include vinylidene fluoride hexafluoropropylene rubber (VDF-HFP fluorine rubber), vinylidene fluoride hexafluorophenol rubber and propylene-tetrafluoroethylene rubber (VDF- HF P _T FE fluororubber, bilidenefluoride-pentafluoropropylene fluororubber (VDF-PFP fluororubber), bilidenefluoride pentafluoropropylene-tetrafluoroethylene Fluororubber (VDF- PFP- TFE fluororubber), vinylidene funoreolay Doper phnoreolomethinorevinyl ether-tetrafluoroethylene fluororubber (VDF_P FMVE- TFE fluororubber), vinylidene funoreo Lydrochloro Trifnoreo ethylene ethylene rubber (VDF—CTFE fluorine
- the above-mentioned conductive additive optionally contained in the polarizable electrode layers 112, 122 is used between the current collectors 111, 121 and the polarizable electrode layers 112, 122.
- the above-mentioned conductive additive optionally contained in the polarizable electrode layers 112, 122 is used between the current collectors 111, 121 and the polarizable electrode layers 112, 122.
- Examples of the carbon black include acetylene black, keffene black, and furnace black. In the present invention, acetylene black is preferably used.
- the average particle size of the carbon black preferred properly is 25 to 50 nm, as the BET specific surface area, preferably 50 m 2 Z g or more, more preferably 50 to 14 It is.
- the thickness of the polarizable electrode layers 112, 122 is preferably 50 to 20 ⁇ from the viewpoint of reducing the size and weight of the electrochemical capacitor 1 ⁇ 0, More preferably, it is 80 to 150 / im.
- the above-mentioned thickness means the maximum film thickness.
- the undercoat layers 113, 1.23 are provided between the corresponding current collectors 111, 121 and the polarizable electrode layers 112, 122, respectively. Plays the role of giving As a material for the undercoat layer 113, 123, it is preferable to use a material having high conductivity in order to prevent an increase in resistance value.
- conductive particles are bound to the conductive particles. It can be composed of possible binders.
- the content of the conductive particles in the undercoat layer 113, 123 is 50 to 70% by mass based on the total amount of the undercoat layer 113, 123.
- the content of the binder is 30 to 50% by mass based on the total amount of the undercoat layers 113 and 123.
- the conductive particles contained in the undercoat layers 113, 123 can sufficiently transfer electric charges between the current collectors 111, 121 and the polarizable electrode layers 112, 122.
- the particles have electron conductivity that can proceed, and examples thereof include particles made of a carbon material having electron conductivity.
- Specific examples of the carbon material include carbon black and graphite. Is mentioned.
- Examples of the carbon black include acetylene black, keffen black, furnace black and the like, and among them, acetylene black is preferably used.
- the average particle size of the carbon black is preferably 25 to 50 nm, and the BET specific surface area is preferably 5 Om 2 Zg or more, more preferably 50 to L 4 Om 2 g.
- Examples of the graphite include natural graphite, artificial graphite, expanded graphite, and the like.
- artificial graphite is preferably used.
- the average particle size of the graphite is preferably 4 to 6 ⁇ ,
- the BET specific surface area is preferably at least 1 Om 2 Zg, more preferably 15 to 3 Om 2 / g.
- the binder is not particularly limited as long as it is a material capable of binding the conductive particles, like the binder contained in the polarizable electrode layers 112 and 122.
- PTFE polytetrafluoroethylene
- PVDF polyvinylidene fluoride
- PE polyethylene
- PP polypropylene
- fluoro rubber etc.
- fluororubber it is particularly preferable to use fluororubber. This is because if fluorocarbon rubber is used, the conductive particles can be sufficiently bound even with a small content, and furthermore, the current collector 11 or 12 and the polarizable electrode layer 11 1 This is because physical and electrical adhesion with 2 or 122 is improved.
- the fluororubber the above-mentioned materials preferably exemplified as the binder contained in the polarizable electrode layers 112 and 122 can be used.
- the thickness of the undercoat layer 113, 123 is set from the viewpoint of making the overall thickness as thin as possible and preventing the resistance of the electrodes 110, 120 from increasing. As long as the polarizable electrode layer 112 or 122 can be sufficiently bonded, it is desirable to be as thin as possible. Specifically, 0. 2 ⁇ or more, it is preferable that the 1 0 / m hereinafter.
- the separator 130 allows the electrolyte solution to move between the polarizable electrode layers 112 and 122 while physically separating the polarizable electrode layers 112 and 122 from each other.
- the separator 130 is preferably formed of an insulating porous material. For example, a laminate of a film made of polyethylene, polypropylene, or polyolefin, a stretched film of a mixture of the above resins, or a cell mouth, polyester And a nonwoven fabric made of at least one kind of constituent material selected from the group consisting of polypropylene and polypropylene.
- the thickness of the separator 130 is not particularly limited, but is preferably at least 200 xm, more preferably at least 30 im and at most 100 ⁇ .
- an electrolyte solution (aqueous electrolyte solution, an electrolyte solution using an organic solvent) used in a known electrochemical capacitor such as an electric double layer capacitor can be used.
- the electrolytic solution is electrochemically low in decomposition voltage, so that the withstand voltage of the capacitor is limited to a low level. (Aqueous electrolyte solution).
- the type of the specific electrolyte solution is not particularly limited, but is preferably selected in consideration of the solubility, dissociation degree of the solute, and the viscosity of the liquid, and has a high conductivity and a high potential window (high decomposition starting voltage) It is particularly desirable to use an electrolyte solution of A typical example is a solution in which a quaternary ammonium salt such as tetraethylammonium tetrafluoroborate is dissolved in an organic solvent such as propylene carbonate, diethylene carbonate, or acetonitrile. . In this case, it is necessary to strictly control the water content.
- the electrochemical capacitor 100 having such a configuration preferably has an overall thickness (maximum film thickness) of 70 to 250 ⁇ m, and 100 to 180 ⁇ . Is more preferable. With such a thickness, the size and weight of the electrochemical capacitor 100 can be reduced.
- FIG. 2 is a partial sectional view showing a part of the electrochemical capacitor 100 in an enlarged manner.
- the distance between the end of the polarizing electrode layer 112 and the end of the undercoat layer 113 is ⁇ a 1 '', Assuming that the distance between the end of the polarizable electrode layer 1 1 2 and the end of the separator 130 is “a 2”, 0 a 1 ⁇ a 2 is set.
- the distance between the end of 22 and the end of the undercoat layer 1 23 is denoted by “b 1”, and the distance between the end of the polarizable electrode layer 122 and the end of the separator 130 is denoted by “b 2”. ", It is set as 0 ⁇ bl ⁇ b2.
- a in a1 takes a positive value when the end of the undercoat layer 113 is located outside the end of the polarizable electrode layer 112 (the state shown in FIG. 2).
- the value of b1 is such that the end of the undercoat layer 123 is closer to the end of the polarizable electrode layer 122.
- a 2 and b 2 correspond to the case where the end of the separator 130 is located outside the end of the polarizable electrode layer 112 and 122 (the state shown in FIG. 2). Take a positive look at
- the ends of the undercoat layers 113 and 123 are located on the same or outer sides as the ends of the corresponding polarizable electrode layers 112 and 122, respectively, and both of the ends of the separator 1 It will be located inside the end of 30.
- the undercoat layers 1 1, 1 2 3 always exist under the polarizable electrode layers 1 1, 1 2 2, the polarizable electrode layers 1 1 2 and 1 2 2 are peeled off. Does not occur.
- the separator 130 is always interposed between the undercoat layer 113 and the undercoat layer 123, the undercoat layers may come into contact with each other, or the undercoat layer of one electrode and the other may be in contact with each other. No contact with the current collector of the electrode.
- the separator 130 does not hinder the connection between the 121 a and the external circuit.
- Fig. 2 shows the extraction electrodes 1 1 a, 1
- FIG. 3 shows that 0 a 1 is not satisfied and 0> al (that is, the end of the undercoat layer 113 is located inside the end of the polarizable electrode layer 112).
- such a problem is the same when 0 ⁇ b1 is not satisfied and 0> b1.
- Fig. 4 shows that a1 and a2 are not satisfied and a1 ⁇ a2.
- FIG. 4 is a partial cross-sectional view in a case where an end of the separator 130 is located inside an end of the undercoat layer 113. If a 1 ⁇ a 2 is not satisfied, as shown in FIG. 4, the end of the undercoat layer 1 13 directly faces the current collector 12 1 without the interposition of the separator 130. would. For this reason, the undercoat layer 113 may come into contact with the current collector 122 to cause a short circuit, thereby deteriorating the reliability of the product. Although not shown, such a problem is the same when b 1 and b 2 are not satisfied and b 1 ⁇ b 2.
- the undercoat layer 1 1 There is also a possibility that short circuit may occur due to contact between 3 and the undercoat layer 1 2 3. Since the undercoat layers 113 and 123 have a predetermined thickness, contact between the undercoat layers occurs more easily than contact between the undercoat layer and the current collector. In other words, if a la 2 and b 1 b 2, the reliability of the product is particularly low.
- the end of the separator 130 is inside the ends of the polarizable electrode layers 112 and 122, the polarizable electrode layer 112 and the polarizable electrode layer 122 are short-circuited. Needless to say, the end of the separator 130 needs to be located outside the ends of the polarizable electrode layers 112 and 122.
- a1 and b1 are not particularly limited, but are preferably in the range of 0 to 0.5 mm. This is because when the thickness exceeds 0.5 mm, the area of the polarizable electrode layers 1 1, 1 2 and 2 decreases more than necessary, and as a result, the capacity decreases. To do that. On the other hand, considering the coating accuracy, it is possible to set a1 and b1 to 0.5 mm or less, which makes it possible to secure a high capacity.
- a coating liquid as a material for the undercoat layers 113, 123 and a coating liquid as a material for the polarizable electrode layers 112, 122 are prepared.
- the coating liquid used as the material of the undercoat layer 113, 123 is charged into the mixing device with the above-described conductive particles, binder, and liquid described below, and stirred.
- the coating liquid serving as the material for the polarizable electrode layers 112, 122 is charged with the above-described porous particles, the binder 1, the liquid described below, and the above-described conductive auxiliary agent as necessary into a mixing device, Stir.
- kneading means kneading the materials by stirring the liquid in a relatively high viscosity state
- diiluting mixing means adding a solvent or the like to the kneaded liquid to relatively mix. It means to mix in a low viscosity state.
- the operation time and the temperature during the operation are not particularly limited, but the kneading time is about 30 minutes to 2 hours and the temperature during the kneading is about 40 to 80 ° C in order to obtain a uniform dispersion state.
- the dilution and mixing time is about 1 to 5 hours, and the temperature during the dilution and mixing is about 20 to 50 ° C. This makes it possible to prepare a coating liquid as a material for the undercoat layers 113, 123 and a coating liquid as a material for the polarizable electrode layers 112, 122.
- the liquid is not particularly limited as long as it can dissolve or disperse the binder.
- Ketone solvents such as 1 B can be used.
- the amount of the liquid in the coating liquid is 600 to 600 parts by weight based on the total amount of solids in the coating liquid.
- the amount is preferably 2000 parts by mass, and in the coating liquid used as the material for the polarizable electrode layers 112, 122, the amount is 200 to 400 parts by mass with respect to 100 parts by mass of the total solid content in the coating solution. Is preferred.
- the contents of the conductive particles and the binder in the coating liquid used as the material of the undercoat layers 113 and 123 are described above based on the contents of the conductive particles and the binder after the formation of the undercoat layers 113 and 123. It is preferable to set them so as to fall within the specified range.
- the content of the porous particles and the binder in the coating liquid as the material of the polarizable electrode layers 112 and 122 is determined by the amount of the porous particles and the binder after the polarizable electrode layers 112 and 122 are formed. Is preferably set to fall within the range described above.
- the current collector sheet 140 is transported in one direction (from left to right in FIG. 5), and the undercoat layer is transferred.
- the gravure cylinder 150 Is supplied from the gravure cylinder 150, and the coating liquid for the polarizable electrode layer is supplied from the gravure cylinder 160.
- the gravure cylinder 160 since the gravure cylinder 160 is disposed downstream from the gravure cylinder 150, the undercoat layer 1 13 123 is formed, and the polarizable electrode layers 112, 122 are formed on top of it.
- various known coating methods can be used without particular limitation. For example, a method such as an etastrusion lamination method, a doctor blade method, a gravure coating method, a reverse coating method, an applicator coating method, and a screen printing method can be employed.
- the difference between the width W1 of the Daravia cylinder 150 and the width W2 of the gravure cylinder 160 is Oram, Wl—W2 ⁇ More preferably, it is 0.5 mm.
- Wl—W2 ⁇ More preferably, it is 0.5 mm.
- the exposed width (corresponding to a1 or b1) of the undercoat layer 113, 123 is at least one of the ends 171, 172. This is because it can be less than 0.5 mm.
- W4-5 mm is set, the exposed width of the undercoat layers 113, 123 can be made 0.5 mm or less for both ends 171, 172.
- the width W1 of the Daravia cylinder 150 and the width W2 of the Daravia cylinder 160 is too small, there is a high possibility that the polarizable electrode layers 112, 122 will protrude due to a shift in the application position. Therefore, considering the coating accuracy, it is particularly preferable to set 0.2 mm ⁇ W4-W2 ⁇ 0.5 mm. After the undercoat layers 113 and 123 and the polarizable electrode layers 112 and 122 are formed on the surface of the current collector sheet 140 in this manner, the dashed line 180 shown in FIG. By cutting this along the line, the first electrode 110 or the second electrode 120 shown in FIG. 1 is completed.
- the separator 130 is housed in a case (not shown), and the case is filled with the electrolyte solution.
- An electrochemical capacitor 1 ⁇ ⁇ with 1 1 a as one terminal and the extraction electrode 121 a as the other terminal is completed.
- the polarizable electrode layers 112, 122 are roll-pressed or the like. By compressing 122 and increasing its density, it is possible to achieve such a thinner without reducing the capacity.
- the electrochemical capacitor 100 having only one pair of polarizable electrode layers has been described above, the electrochemical capacitor to which the present invention can be applied is not limited to this.
- the effect of the present invention is remarkable when a structure in which is laminated is adopted.
- FIG. 7 is an exploded cross-sectional view of an electrochemical capacitor 200 according to another preferred embodiment of the present invention.
- the electrochemical capacitor 200 is A plurality of first and second electrodes 210, 220 arranged in a plurality of electrodes, and a plurality of separators 230 arranged between adjacent electrodes, respectively. Therefore, if the first electrode 210 is an anode, the second electrode 220 is a force sword, and if the first electrode 210 is a force sword, the second electrode 220 is an anode. is there.
- the first and second electrodes 210, 220 are respectively composed of current collectors 211, 221 and a polarizable electrode layer 211, 2 provided on one surface of the current collector.
- the current collectors 2 1 1 and 2 2 1 are provided with extraction electrodes 2 1 1 a and 2 2 a, respectively, and the plurality of extraction electrodes 2 1 1 a are arranged so as to face in the same direction.
- the plurality of extraction electrodes 222 a are arranged so as to face each other in the same direction different from the above direction.
- the electrochemical capacitor 200 having such a configuration is completed by sandwiching the separator 230 between the adjacent electrodes, and then storing the separator 230 in a case (not shown), and filling the case with an electrolyte solution.
- a shim 211b electrically connecting these and electrically holding the extraction electrode 211a is inserted.
- a shim 22b that electrically connects them and mechanically holds the extraction electrode 22a is inserted.
- the shims 2 l i b and 2 2 1 b have the function of conducting (connecting) between the extraction electrodes and adjusting the height.
- any material having electrical conductivity and thickness accuracy may be used, and aluminum, stainless steel and the like are preferable.
- the end of the polarizing electrode layer 2 12 (or 2 13) and the end of the undercoat layer 2 14 (or 2 15) If the distance between the end of the polarizable electrode layer 2 12 (or 2 13) and the end of the separator 230 is ⁇ a 2 '', then 0 ⁇ & 1 and & 2, and similarly, the end of the polarizable electrode layer 2 2 2 (or 2 2 3) and the undercoat
- the distance between the edge of the layer 2 24 (or 2 25) is defined as “b 1”, and the distance between the edge of the polarizable electrode layer 2 2 (or 2 2 3) and the edge of the separator 2 30. Is set to “b 2”, 0 ⁇ b 1 ⁇ b 2 is set.
- the ends of the undercoat layers 2 14, 2 15, 2 24, and 2 25 are connected to the ends of the corresponding polarizable electrode layers 2 1, 2 1 3, 2 2, 2 2 3 respectively. , Or both, and both are located inside the end of the separator 230. Therefore, it is possible to effectively prevent the occurrence of a short-circuit, as in the above-described embodiment, even though the number of places where a short-circuit is likely to occur is increased due to the laminated structure.
- the undercoat layer 2 14 and 2 15 and the shim 2 11 b may interfere with each other, or the undercoat layer Since there is no interference between 224, 225 and the shim 221b, the desired shape can be maintained even when several hundreds of electrodes are laminated via the separator 230, for example. It is possible. On the other hand, for example, if a1> a2, as shown in FIG. 9, the undercoat layers 2 14 and 2 15 and the shim 2 11b may interfere with each other. In this case, when several hundred layers of electrodes are stacked, the entire thickness in this region increases by the thickness of the undercoat layers 214 and 215, and the desired shape cannot be maintained.
- the present invention can obtain more remarkable effects when employing a structure in which a large number of polarizable electrode layers are stacked.
- the electrode for an electrochemical capacitor manufactured according to the present invention can be used as an electrode for an electric double layer capacitor, and can be used for various electrochemical capacitors such as a pseudo capacitance capacitor, a shadow capacitor, and a redox capacitor. It can be used as an electrode. (Second embodiment)
- FIG. 10 is a schematic view showing the structure of an apparatus for manufacturing an electrode for an electrochemical capacitor according to a preferred embodiment of the present invention.
- the apparatus 600 for manufacturing an electrode for an electrochemical capacitor according to the present embodiment comprises a supply roll 600 around which a belt-shaped current collector 5 16 is wound, at a predetermined speed.
- a coating section 6100, a drying section 6200, and a roll press section 6330 provided in this order between the first and second sections.
- the application section 6100, the drying section 6200, and the roll press section 6300 are arranged from the upstream (supply roll 6101).
- the electrochemical capacitor electrode manufacturing apparatus 600 is provided with a driving unit (driving means) 660 for adjusting the formation position of the coating film L2 in the width direction by the coating unit 610.
- the operation of the driving unit 660 is controlled by an output signal 650 from the control unit 650.
- the force “coating L 2” described below is an undried film that is the basis of the polarizable electrode layer 518, and in the present specification and claims, the undried coating and the dried
- the coating film (polarizable electrode layer) is sometimes simply referred to as “polarizable electrode layer” without distinction.
- the coating part 6 10 is provided with a coating liquid L 1, which is a material of the polarizable electrode layer 5
- the coating section 6110 is provided with a knife coater (electrode coating) for coating the coating liquid L1 on the surface of the current collector 516 curved by the knockup mouth 611 and the knockup roll 611.
- the current collector 516 supplied from the supply roll 601 is conveyed to the coating unit 610 via the guide port 603 and the tension port 604.
- a coating L2 serving as a source of the polarizable electrode layer 518 is formed on one surface of the current collector 516.
- the supply roll 601, the winding roll 602, the guide roll 603, and the tension roll 604 constitute a “transporting unit” of the current collector 516.
- the material of the current collector 516 is not particularly limited as long as it is a good conductor that can sufficiently transfer charges to the polarizable electrode layer 518.
- aluminum (A 1) can be used for the current collector material used for the electrode.
- the thickness of the current collector 5 16 is not particularly limited, but in order to further reduce the size of the electrochemical capacitor, it is preferable to set the thickness as thin as possible as long as the mechanical strength is sufficiently secured. .
- the thickness is preferably set to 20 ⁇ or more and 50 ⁇ m or less, It is more preferable to set it to / m or less. If the thickness of the current collector 16 made of aluminum (A 1) is set in this range, it is possible to achieve downsizing of the electrochemical capacitor while securing sufficient mechanical strength.
- the coating liquid L1 is a liquid to be a material of the polarizable electrode layer 518, and can be adjusted by the following method. First, as shown in Fig. 11, the porous particles P1, the binder P2, the liquid S1, and the conductive additive P3 as needed are put into a mixing device C1 provided with a stirring section SB1. Stir.
- the porous particle P1 is not particularly limited as long as it is a porous particle having electron conductivity that contributes to charge storage and discharge, and examples thereof include granular or fibrous activated carbon.
- activated carbons phenol-based activated carbon, coconut palm activated carbon, or the like can be used.
- the average particle diameter of the porous particles is preferably 3 to 20 ⁇ , and the BET specific surface area determined by using a BET isotherm from a nitrogen adsorption isotherm is preferably 150 Om 2 Zg or more, more preferably is a 2000 ⁇ 2 5 00m 2 Zg. By using such porous particles, a high volume capacity can be obtained. Is possible.
- the binder P2 is not particularly limited as long as it is a binder capable of binding the porous particles P1, and examples thereof include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and polyethylene (PE). , Polypropylene (PP), fluorine rubber and the like can be used. Among them, it is particularly preferable to use fluororubber. This is because the use of fluororubber makes it possible to sufficiently bind the porous particles P1 even with a small content, thereby improving the coating strength of the polarizable electrode layer 108 and improving the coating strength. This is because the size of the multilayer interface is improved, and the volume capacity can be improved.
- fluororubber examples include vinylidenefluorhexafluoropropylene-based fluorororubber (VD F—HFP-based fluororubber), vinylidenefluorenolide hexafenoleo- mouth propylene-tetraphenylolethylene-based fluororubber (VD F-HF P- TFE-based fluoro rubber), vinylidene phenolic fluoropentane fluoro rubber (VDF-PFP-based fluoro rubber), vinylidene phenolic fluoropentane Polyethylene-based fluoro rubber (VDF-PFP-TFE-based fluoro rubber), vinylidenefluoride-perfluoromethylvinyl ethenolate tetraphenylene ethylene-based fluoro rubber (VDF-P FMVE-T FE-based Fluorine rubber), vinylidenefluorine dichloro trifrenole mouth ethylene fluoro rubber (VDF-CTFE fluor
- the conductive auxiliary agent P 3 is not limited as long as it has an electronic conductivity that can sufficiently transfer the charge between the current collector 5 16 and the polarizable electrode layer 5 18.
- examples include carbon black.
- Examples of the car pump rack include acetylene black, keffene black, and furnace black.
- acetylene black is preferably used.
- the average particle size of carbon black is 25 to 50 nm, and the BET specific surface area is preferably 5 O m 2 , g or more, more preferably 50 to 140 m 2 Z g.
- the liquid S 1 is not particularly limited as long as it can dissolve or disperse the binder P 2.
- a ketone solvent such as methyl ethyl ketone (MEK) or methyl isobutyl ketone (MIBK) may be used. it can.
- the blending amount of the liquid S1 in the coating liquid L1 is preferably from 200 to 400 parts by mass with respect to the total solid content of 10 to 0 parts by mass in the coating solution L1.
- the content of the porous particles ⁇ 1 in the coating solution L1 is based on the total amount of the porous particles 11 after forming the polarizable electrode layer 518, based on the total amount of the polarizable electrode layer 518. Is preferably set to be 84 to 92% by mass. Further, the content of the binder ⁇ 2 is such that the content of the binder ⁇ 2 after forming the polarizable electrode layer 518 is 6.5 to 16% by mass based on the total amount of the polarizable electrode layer 518. It is preferable that the setting is made as follows.
- the porous material particles 1 after the formation of the polarizable electrode layer 518, the porous material particles 1 have 84 to 92 mass based on the total amount of the polarizable electrode layer 518. / 0 , the binder ⁇ 2 is 6.5 to 16% by mass, and the conductive auxiliary agent 3 is preferably 0 to 1.5% ° / 0 .
- the preparation of the coating liquid L1 preferably includes a kneading operation and / or a dilution mixing operation.
- kneading means kneading the materials by stirring the liquid in a relatively high viscosity state
- diluting and mixing means adding a solvent or the like to the kneaded liquid. This means that they are mixed in a relatively low viscosity state.
- the time and temperature for these operations are not particularly limited, but the kneading time is about 30 minutes to 2 hours and the temperature during kneading is about 40 to 80 ° C in order to obtain a uniform dispersion state.
- the dilution and mixing time is about 1 to 5 hours, and the temperature during dilution and mixing is preferably about 20 to 50 ° C.
- the drying section 62 is a section for removing the liquid S1 contained in the coating film L2.
- the apparatus 600 for manufacturing an electrode for an electrochemical capacitor according to the present embodiment includes two dryers 6 2 1 and 6 2 2 arranged so as to sandwich the current collector 5 16. Liquid contained in coating film L 2 due to heating by 6 2 1 and 6 2 2 S 1 is removed to form the polarizable electrode layer 5 18. As a result, the polarizable electrode layer 518 is formed on the surface of the current collector 516. However, in this state, the density of the polarizable electrode layer 518 is low, and a high volume capacity cannot be obtained in this state.
- the roll press section 630 is a section for compressing the polarizable electrode layer 618 in order to increase the volume capacity thereof.
- the first roller 631 disposed on the polarizing electrode layer 518 side and the second roller 631 disposed on the current collector 516 side are disposed.
- the laminated body 5200 is roll-pressed by the rollers 631 and 632 to compress the polarizable electrode layer 518 included in the laminated body 5220.
- a concavo-convex pattern is provided on the surface of the first roller 631, which is disposed on the side of the polarizable electrode layer 518, the polarizability passing through the roll press section 630 The concavo-convex pattern is transferred to the surface of the electrode layer 518, whereby the polarizable electrode layer 518 can be effectively compressed.
- the laminate 520 on which such roll pressing is completed is wound around a take-up roll 602.
- FIG. 12 is a schematic perspective view showing the vicinity of the application section 610 in an enlarged manner.
- the knife coater 6 12 included in the application section 6 10 has a width of the current collector 5 16 on a belt-shaped current collector 5 16 conveyed in the longitudinal direction D 1.
- a coating L2 having a predetermined width serving as a base of the polarizing electrode layer 518 is formed such that the uncoated region 516a is left at both ends in the direction.
- W 1 and W 2 these relationships are set to W l> W 2, whereby the coating section 6 10
- a coating film L2 is formed substantially at the center, leaving an uncoated area 516a.
- the optical sensor 640 disposed downstream of the coating section 6100 detects the boundary position between the coating film L2 and one of the uncoated areas 516a, and an output indicating the detection result is provided.
- the force signal 641 is supplied to the control unit 650 as described above.
- Such a boundary detection operation by the optical sensor 640 may be referred to as a “detection step”.
- the control unit 650 which has received the output signal 640 from the optical sensor 640, controls the driving unit 660 by generating the output signal 655 based on the output signal 640, As a result, feedback is performed so that the boundary position becomes a predetermined position. That is, when the boundary position is deviated from the predetermined position in the direction R shown in FIG. 12, the drive unit 660 changes the position of the knife coater 6 12 to the direction R by 180. ° Shift in the opposite direction L, and conversely, when the above boundary position is shifted from the predetermined position in the direction L shown in FIG. Shift the position in direction R. Thereby, the boundary position is substantially fixed at a predetermined position.
- Such feedback control is most preferably performed in real time, but can also be performed periodically.
- the feedback control is performed periodically, it is preferable to determine the control cycle in consideration of the transport speed of the current collector 516, for example, when the current collector 516 transports about lm in the length direction. What is necessary is just to set so that feedback control is performed each time it is performed.
- the width of the uncoated area 516a is substantially fixed to a desired value.
- W1 of the current collector 516 and the width W2 of the coating L2 have predetermined values, when the width of the uncoated area 516a is W3, W3
- the laminated body 520 wound around the take-up roll 50 is cut into a predetermined size, and as shown in FIG.
- the electrode for electrochemical capacitor 510 is completed as shown in FIG. 13 (c).
- FIG. 13 (c) if a part of the current collector 5 16 not covered by the polarizable electrode layer 5 18 is taken out at the same time, it can be used as the extraction electrode 5 12 Becomes possible.
- the polarizable electrode layer 51 is controlled by feedback control.
- the desired length of the extraction electrode 5 12 corresponding to this is also desired. It becomes possible.
- at least two electrodes 510 for electrochemical capacitors prepared as shown in FIG. 14 are prepared, and these two electrodes 510 for electrochemical capacitors are used so that the polarizable electrode layers 518 face each other.
- the separator is housed in a case (not shown), and the case is filled with an electrolyte solution to complete the electrochemical capacitor.
- the separator 540 is preferably formed of an insulating porous material.
- an insulating porous material for example, a laminate of a film made of polyethylene, polypropylene, or polyolefin, a stretched film of a mixture of the above resins, or cellulose, A fibrous nonwoven fabric made of at least one kind of constituent material selected from the group consisting of polyester and polypropylene can be used.
- an electrolyte solution (an aqueous electrolyte solution or an electrolyte solution using an organic solvent) used in a known electrochemical capacitor such as an electric double layer capacitor can be used.
- the electrolytic solution is electrochemically low in decomposition voltage and the withstand voltage of the capacitor is limited to a low level. Therefore, an electrolytic solution using an organic solvent (a non-aqueous electrolyte solution) is used. ) Is preferable.
- the type of the specific electrolyte solution is not particularly limited, it is preferable to select in consideration of the solubility of the solute, the degree of dissociation, and the viscosity of the solution, and the electrolyte having a high conductivity and a high potential window (high decomposition starting voltage). Particularly desirable is a solution.
- a typical example is a solution in which a quaternary ammonium salt such as tetraethylammonium tetrafluoroborate is dissolved in an organic solvent such as propylene carbonate, diethylene carbonate, and acetonitrile. In this case, it is necessary to strictly control the water content.
- the boundary between the coating film L2 that is the base of the polarizable electrode layer 518 and one uncoated region 516a The position is detected by the optical sensor 640, and the position in the width direction of the knife coater 612 is feedback-controlled based on this, so that the formation position of the polarized electrode layer 518 is controlled with high precision. It is possible to do. As a result, even when a part of the current collector 516 is used as the extraction electrode 521, the assembly can be performed. It is possible to secure as large a capacity as possible without compromising ease of use.
- the position of the polarizable electrode layer 518 should be controlled by changing the position of the current collector 516 itself by moving the position of the supply roll 601 in the width direction by feedback control. Is also possible. However, it is difficult to make the distance between the supply roll 601 and the application section 6 10 extremely short. Therefore, when the position of the current collector 5 16 itself is changed, the optical sensor 6 4 The response to signal 6 4 1 from 0 will be very poor.
- the knife coater 612 for forming the polarizer electrode layer 518 is moved in the width direction instead of the current collector 516. The response to the output signal 641 of the current collector is good, and therefore, even if the current collector 516 is conveyed at a high speed, it is possible to control the formation position of the polarizable electrode layer 518 with high accuracy. Become.
- both uncoated areas 5 16a are substantially matched by feedback control, as shown in FIG. 15, both uncoated areas 5 16a are drawn out as electrodes 5 12. Even when the laminated body 5200 is punched out so that it can be used, the width of each of the extracted electrodes 512 of the electrode 510 for the extracted electrochemical capacitor can be made substantially constant.
- the effect of the present invention is particularly remarkable when an undercoat layer serving as a bonding layer is provided between the current collector 516 and the polarizable electrode layer 518.
- the material of the undercoat layer it is preferable to use a material having high conductivity in order to prevent an increase in the resistance value. be able to.
- the conductive particles include particles made of a carbon material having electron conductivity, and specific examples of the carbon material include carbon black and graphite.
- Examples of the carbon black include acetylene black, keffen black, furnace black and the like, and among them, acetylene black is preferably used.
- the average particle size of the carbon black is preferably 25 to 50 nm, and the BET specific surface area is preferably 50 m 2 / g or more, more preferably. Or 50 to 140 m 2 / g.
- Examples of the graphite include natural graphite, artificial graphite, expanded graphite, and the like.
- artificial graphite is preferably used.
- the average particle size of the graphite is preferably 4 to 6 ⁇ , and the BET specific surface area is preferably 1 Om 2 / g or more, more preferably 15 to 3 ⁇ m. It is. By using such a graphite, it becomes possible to impart excellent electron conductivity to the undercoat layer, and the internal resistance tends to be sufficiently reduced.
- the binder is not particularly limited as long as it is a material capable of binding conductive particles, like the binder contained in the polarizable electrode layer 18.
- a material capable of binding conductive particles like the binder contained in the polarizable electrode layer 18.
- PTFE polytetrafluoroethylene
- PVDF polyfluorinated Vinylidene
- PE polyethylene
- PP polypropylene
- fluoro rubber etc.
- fluororubber it is particularly preferable to use fluororubber. This is because if fluorocarbon rubber is used, it is possible to sufficiently bind the conductive particles even with a small content, and furthermore, the physical and electrical connection between the current collector 5 16 and the polarizable electrode layer 5 18 This is because the electrical adhesion is improved.
- the fluororubber the above-mentioned materials preferably exemplified as the binder contained in the polarizable electrode layer 518 can be used.
- FIG. 16 is a schematic diagram
- the belt-shaped current collector 516 is transported in the longitudinal direction D1 while the knife coater located on the upstream side (undercoat coating means)
- An undercoat layer 517 is formed by applying a coating liquid for the undercoat layer by 670, and subsequently, a polarizable electrode layer 518 by a knife coater (electrode applying means) 612 located on the downstream side.
- a polarizable electrode layer 518 is formed on the undercoat layer 517 by applying a coating solution for the varnish.
- the drying section for drying each coating film is omitted.
- the coating liquid employed by the undercoat can be prepared by stirring the conductive particles and the binder, which are the materials of the undercoat layer, in the liquid S1 described above. It is preferable that the preparation of the coating solution for the undercoat layer also includes a kneading operation and / or a dilution mixing operation.
- the boundary between the coated area and the uncoated area of the undercoat layer 517 is detected by the optical sensor (detection means) 680, and the feedback control based on this detects the drive section (drive means) 6 90
- the position of the coating portion 670 in the width direction is controlled using the optical sensor 640, and the boundary between the coating region and the non-coating region of the polarizing electrode layer 518 is detected by the optical sensor 640, and the drive is performed by feedback control based on this
- ⁇ 660 By controlling the position in the width direction of the coating section 6 10 using ⁇ 660, it is possible to control the coating positions of the undercoat layer 5 17 and the polarizable electrode layer 5 18 with high precision. .
- the difference between the coating width W4 of the coating section 51 70 and the coating width W2 of the coating section 6 10 is preferably W4-W2 ⁇ 1.0 mm, and W4-W2 ⁇ 0.5 mm. Is more preferred.
- W4—W2 ⁇ l.Oram the exposed width of the undercoat layer 5 17 can be set to 0.5 mm or less for at least one of the ends 5 17a and 5 17b. This is because if W4-5 mm is set, the exposed width of the undercoat layer 517 can be set to 0.5 mm or less for both ends 517a and 517b.
- the exposed width of the undercoat layer 517 be 0.5 mm or less. If the exposed width exceeds 0.5 mm, the area of the polarizable electrode layer 518 is reduced more than necessary. This is because the capacity decreases. On the other hand, if the feedback control according to the present invention is performed, it is sufficiently possible to set the exposure width to 0.5 mm or less. As a result, a high capacity can be secured.
- FIG. 19 is a partial cross-sectional view showing a state in which the electrodes 5300 for electrochemical capacitors are stacked with a separator 540 interposed therebetween.
- the distance between the end of the polarizable electrode layer 5 18 and the end of the undercoat layer 5 17 is defined as “a 1”.
- the value of al can be set to a very small value (preferably 0.5 mm or less). Therefore, it is easy to set 0 ⁇ a1 and a2.
- the value of a 1 is a positive value when the end of the undercoat layer 517 is located outside the end of the polarizable electrode layer 518 (the state shown in FIG. 19).
- the value of a 2 takes a positive value when the end of the separator 540 is located outside the end of the polarizable electrode layer 518 (the state shown in FIG. 19).
- the ends of the undercoat layer 517 are located at the same or outer sides as the ends of the corresponding polarizable electrode layers 518, and both are located inside the ends of the separator 540. Will be located.
- the undercoat layer 517 always exists below the polarizable electrode layer 518, the polarizable electrode layer 5 No peeling of 18 occurs.
- the separator 40 is always interposed between the upper and lower undercoat layers 5 17, the undercoat layers may come into contact with each other or the undercoat layer 5 17 of one electrode and the current collector of the other electrode. There is no contact with 5 16.
- the undercoat layer 517 is provided between the current collector 516 and the polarizable electrode layer 518, the undercoat layer 517 and the polarizable electrode layer 518 are fed back. If the application position is controlled while controlling, in addition to the effect of the above-described embodiment, it is also possible to effectively prevent the occurrence of short-circuit failure due to the undercoat layer 517.
- the undercoat layer 517 and the polarizable electrode layer 518 can be accurately aligned, and as a result, a sufficient capacity can be obtained. It is possible to effectively prevent the occurrence of short-circuit failure while securing the same.
- the knife coat method is used to form the coating film that is the basis of the polarizable electrode layer.
- the etast lumination lamination method, the doctor blade method, Other methods such as a gravure coating method, a reverse coating method, an applicator coating method, a screen printing method, and a die coating method can be used.
- the polarizable electrode layer 5 18 is formed such that the uncoated areas 5 16 a remain at both ends in the width direction of the current collector 5 16. However, it is not essential to form the uncoated areas 516a at both ends of the current collector 516, and at least one of them is formed. It is sufficient to form an uncoated area 5 16 a at the end. When the uncoated region 516a is formed only at one end, the optical sensor 640 may detect the boundary position at the end. Further, in the apparatus for manufacturing an electrode for an electrochemical capacitor according to the present invention, as shown in the apparatus shown in FIG. 10, the coating section 610, the drying section 620 and the roll press section 630 are continuously and integrally formed.
- the configuration is arranged in any of the devices, and an aggregate of two or more devices may be used as long as the above order is secured.
- the sheet-shaped current collector 516 that has passed through the drying unit 620 may be temporarily wound, and roll-pressed by another device having a roll press unit.
- the undercoat layer 5 17 is first formed by using the apparatus shown in FIG. 10, and once wound into a roll, the coating film L 2 is formed on the undercoat layer 5 17 by using the same apparatus. It may be formed. Also in this case, the application widths W2 and W4 and the unapplied area widths W and W5 may be controlled as in the above embodiment. Further, the roll press after the application may be performed by another device as described above.
- the electrode for an electrochemical capacitor manufactured according to the present invention can be used as an electrode for various types of electrochemical capacitors such as a pseudo-capacitance capacitor, a pseudo capacitor, a redox capacitor, etc., in addition to an electrode for an electric double layer capacitor. It is possible to use.
- an electrochemical capacitor in which a short circuit via an undercoat layer is prevented. Further, it is possible to provide a method for manufacturing an electrode for an electrochemical capacitor and a device for manufacturing an electrode for an electrochemical capacitor, which can control the formation position of the polarizable electrode layer with high accuracy.
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- Engineering & Computer Science (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (1)
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EP04808062A EP1699062A4 (en) | 2003-12-22 | 2004-12-22 | ELECTROCHEMICAL CONDENSER, METHOD FOR PRODUCING AN ELECTRODE FOR AN ELECTROCHEMICAL CONDENSER AND DEVICE FOR PRODUCING AN ELECTRODE FOR AN ELECTROCHEMICAL CONDENSER |
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JP2003425020A JP2005183806A (ja) | 2003-12-22 | 2003-12-22 | 電気化学キャパシタ |
JP2003-425020 | 2003-12-22 | ||
JP2003427269A JP2005191070A (ja) | 2003-12-24 | 2003-12-24 | 電気化学キャパシタ用電極の製造方法及び電気化学キャパシタ用電極の製造装置 |
JP2003-427269 | 2003-12-24 |
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PCT/JP2004/019712 WO2005062320A1 (ja) | 2003-12-22 | 2004-12-22 | 電気化学キャパシタ、電気化学キャパシタ用電極の製造方法及び電気化学キャパシタ用電極の製造装置 |
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US (1) | US7251122B2 (ja) |
EP (1) | EP1699062A4 (ja) |
WO (1) | WO2005062320A1 (ja) |
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JP2013051040A (ja) * | 2011-08-30 | 2013-03-14 | Gs Yuasa Corp | 電池用電極の製造方法及び電池用電極 |
JP2015103394A (ja) * | 2013-11-25 | 2015-06-04 | 株式会社Gsユアサ | 蓄電素子 |
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US7173806B2 (en) * | 2003-12-22 | 2007-02-06 | Tdk Corporation | Electrode for electric chemical capacitor, manufacturing method and apparatus thereof |
JP2006324288A (ja) * | 2005-05-17 | 2006-11-30 | Tdk Corp | 電気化学キャパシタ用電極の製造方法 |
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JP5026544B2 (ja) * | 2009-07-17 | 2012-09-12 | 太陽誘電株式会社 | 電気化学デバイス |
KR101079497B1 (ko) * | 2010-02-16 | 2011-11-03 | 삼성전기주식회사 | 전기 이중층 커패시터 셀과 전기 이중층 커패시터의 제조방법 및 전기 이중층 커패시터 셀의 제조장치 |
KR101128565B1 (ko) * | 2010-08-06 | 2012-03-23 | 삼성전기주식회사 | 전기화학 커패시터 및 이의 제조 방법 |
JP6233688B2 (ja) | 2012-09-13 | 2017-11-22 | 株式会社Gsユアサ | 電極体、電極体の製造方法、及び電極体を備えた蓄電素子 |
JP5622893B1 (ja) | 2013-05-24 | 2014-11-12 | 富士機械工業株式会社 | 両面塗工システム |
TWI621143B (zh) * | 2016-08-10 | 2018-04-11 | 鈺邦科技股份有限公司 | 薄膜電容器及其製作方法 |
US11830672B2 (en) | 2016-11-23 | 2023-11-28 | KYOCERA AVX Components Corporation | Ultracapacitor for use in a solder reflow process |
WO2019033338A1 (en) * | 2017-08-17 | 2019-02-21 | Microvast Power Systems Co., Ltd. | ANODES, PROCESSES FOR PREPARING THE SAME, AND LITHIUM ION BATTERIES |
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Also Published As
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EP1699062A1 (en) | 2006-09-06 |
US7251122B2 (en) | 2007-07-31 |
US20050201041A1 (en) | 2005-09-15 |
EP1699062A4 (en) | 2009-12-23 |
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