Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
  • H01G9/0029—Processes of manufacture
• • 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
  • H01G11/30—Electrodes characterised by their material
  • H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/04—Processes of manufacture in general
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• • 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
  • Y02E60/10—Energy storage using batteries
• • 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
• • 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
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
• • 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
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

• the present invention relates to a method for producing an electrochemical capacitor used for backup power source, regeneration, power storage, etc. of various electronic devices, hybrid vehicles and fuel cell vehicles.
• the present invention relates to a pretreatment method and a manufacturing method of a negative electrode for an electrochemical capacitor.
• An electric double layer capacitor has a high withstand voltage and a large capacity, and also has a high reliability of rapid charge / discharge. Therefore, it is used in many fields.
• Polarizable electrodes mainly composed of activated carbon are used for the positive and negative electrodes of general electric double layer capacitors.
• the withstand voltage of the electric double layer capacitor is 1.2V when an aqueous electrolyte is used, and 2.5 to 3.3V when an organic electrolyte is used. Since the energy of an electric double layer capacitor is proportional to the square of the withstand voltage, the withstand voltage is high! / Use of an organic electrolyte is higher than when an aqueous electrolyte is used. However, the energy density of electric double layer capacitors using organic electrolyte is less than 1/10 that of secondary batteries such as lead-acid batteries, and further energy density needs to be improved.
• an electric double layer capacitor has been proposed in which an electrode using a carbon material capable of occluding and desorbing lithium ions is used as a negative electrode, and lithium ions are previously stored in the carbon material. Yes.
• Such an electric double layer capacitor is disclosed in Patent Document 1, for example.
• a polarizable electrode mainly composed of activated carbon is used as the positive electrode.
• the following three methods are disclosed as methods for occluding lithium ions in the negative electrode.
• a negative electrode is prepared by mixing a carbon material and powdered lithium, and the negative electrode is immersed in an electrolytic solution so that lithium is ionized and chemically absorbed in the carbon material.
• a negative electrode manufactured using a carbon material and an electrode containing lithium are immersed in an electrolytic solution, and a current is passed between them to electrochemically occlude lithium ions in the carbon material.
• the above-mentioned electric double layer capacitor has an advantage that it has a high withstand voltage, a large capacity, and can be rapidly charged and discharged.
• the work of occluding lithium ions by a chemical method or an electrochemical method in advance on a carbon material capable of occluding and desorbing lithium ions is complicated and requires a lot of man-hours and costs. However, it is difficult to stably obtain excellent performance.
• Lithium-ion batteries have higher voltage and higher capacity than electric double layer capacitors, but their lifetime is significantly shorter than electric double layer capacitors because of their high resistance and rapid charge / discharge cycles.
• Patent Document 1 JP-A-9 55342
• the present invention relates to a pretreatment method for storing lithium ions in a negative electrode for electrochemical capacitors using a material capable of reversibly occluding and releasing lithium ions, and a method for producing a negative electrode for electrochemical capacitors using the same. And a method of manufacturing an electrochemical capacitor.
• the pretreatment method for an anode for an electrochemical capacitor of the present invention has the following two steps.
• the electrode layer is formed on the current collector using a material capable of reversibly occluding and releasing lithium ions.
• a step of producing a positive electrode by forming a polarizable electrode layer mainly composed of activated carbon on a current collector.
• a lithium layer is formed on the surface of the electrode layer of the produced negative electrode by transfer.
• lithium ions are immediately stored in the electrode layer containing the material before combining with the positive electrode. Therefore, it is not necessary to provide a post-process for occluding lithium ions, and productivity is improved.
• the lithium ion storage state with respect to the electrode layer of the negative electrode is stable, and an electrochemical capacitor having excellent performance can be stably manufactured.
• FIG. 1 is a partially cutaway perspective view showing a configuration of an electrochemical capacitor according to an embodiment of the present invention.
• FIG. 2A is a conceptual diagram of a discharge state of the electrochemical capacitor shown in FIG.
• FIG. 2B is a conceptual diagram of the state of charge of the electrochemical capacitor shown in FIG.
• FIG. 3 is an enlarged cross-sectional view when a lithium layer is transferred onto the negative electrode of the electrochemical capacitor shown in FIG.
• FIG. 4 is an enlarged cross-sectional view showing the state of the electrochemical capacitor element shown in FIG. 1 before electrolyte injection.
• FIG. 5 is a characteristic diagram showing the peel strength of the lithium layer formed on the polypropylene substrate and the peel strength of the negative electrode layer in the embodiment of the present invention.
• Electrode layer (first electrode layer)
• FIG. 1 is a partially cutaway perspective view showing a configuration of an electrochemical capacitor according to an embodiment of the present invention
• FIGS. 2A and 2B are conceptual diagrams of a discharge state and a charge state of the electrochemical capacitor.
• This electrochemical capacitor includes element 1, case 8, sealing rubber 10, and electrolyte 9.
• the element 1 includes a negative electrode 21, a positive electrode 22, and a separator 6. Separator 6 is negative electrode 21 and positive electrode
• the negative electrode 21 and the positive electrode 22 are prevented from coming into contact with each other.
• the negative electrode 21 has a current collector 4 that is a first current collector that does not react with lithium, and an electrode layer 5 provided on both surfaces of the current collector 4.
• the current collector 4 is a copper foil, for example.
• the electrode layer 5 contains a carbon material capable of reversibly occluding and releasing lithium ions.
• a known material such as graphite can be applied to such a carbon material.
• the positive electrode 22 includes a current collector 2 that is a second current collector that does not react with lithium, and a polarizable electrode layer 3 provided on both surfaces of the current collector 2.
• the current collector 2 is, for example, an aluminum foil.
• the electrode layer 3 is mainly made of activated carbon.
• Lead wires 7A and 7B are connected to the negative electrode 21 and the positive electrode 22, respectively.
• Lead wire 7A is made of nickel or copper, and lead wire 7B is made of aluminum.
• the element 1 is housed in the case 8 together with the electrolytic solution 9. And the opening of case 8 is sealed Processed after rubber 10 is inserted. In this way, the case 8 is sealed.
• the lead wires 7A and 7B are drawn out of the case 8 from through holes provided in the sealing rubber 10.
• Case 8 is made of aluminum, for example.
• the sealing rubber 10 is made of, for example, fluoro rubber.
• the electrolyte 9 contains lithium ions 41 and anions 42 such as BF—. In the discharged state
• Lithium ions 41 are released from the carbon material contained in the negative electrode 21, and the anions 42 are desorbed from the activated carbon contained in the positive electrode 22.
• the anions 42 are adsorbed on the activated carbon contained in the cathode 22.
• Electrochemical capacitors are charged and discharged by such charge transfer accompanying the movement of ions. In such a system, since the negative electrode 21 occludes lithium ions 41, the potential is lowered, and the energy density is improved as the voltage of the capacitor is increased.
• the current collector 2 is 30 ⁇ m thick high-purity aluminum foil ( ⁇ 1: 99 ⁇ 99% or more).
• the A1 foil is electrolytically etched in a hydrochloric acid-based etchant to roughen the surface.
• a paste is prepared for forming the electrode layer 3.
• phenol resin-based activated carbon powder having an average particle diameter of 5 m is used as the activated carbon powder.
• carbon black having an average particle diameter of 0.05 m is used as the conductive agent.
• the water-soluble binder solution for example, an aqueous solution of carboxymethyl cellulose (hereinafter referred to as CMC) is used.
• CMC carboxymethyl cellulose
• the paste is applied to both surfaces of the current collector 2, and is dried in air at 100 ° C for 1 hour to form the electrode layer 3. Thereafter, the positive electrode precursor is cut to a predetermined size, and the lead wire 7B is connected to the current collector 2 to complete the positive electrode 22.
• the negative electrode 21 As current collector 4, copper foil with a thickness of 15 m is used. . Then, a paste is prepared to form the electrode layer 3.
• graphite is used as a carbon material capable of reversibly occluding and releasing lithium ions.
• acetylene black is used as the conductive agent.
• binder for example, polytetrafluoroethylene (hereinafter referred to as PTFE) and CMC are used at a weight ratio of 8: 2.
• PTFE polytetrafluoroethylene
• CMC binder
• FIG. 3 is an enlarged cross-sectional view when the lithium layer 11 is transferred onto the negative electrode 21
• FIG. 4 is an enlarged cross-sectional view showing the state of the element 1 before injecting the electrolytic solution 9.
• a lithium layer 11 having a thickness of 3111 is formed on a substrate 31 made of polypropylene (hereinafter referred to as PP) having a thickness of 0.1 mm using a vapor deposition apparatus.
• PP polypropylene
• the lithium layer 11 formed on the substrate 31 is transferred onto the electrode layer 5 formed on the negative electrode 21.
• the lithium layer 11 having a thickness of 3111 is formed on the electrode layer 5.
• the lithium layer 11 is also formed on the other electrode layer 5.
• the above operations are performed in a dry atmosphere so that the lithium layer 11 does not deteriorate.
• the purpose of providing lithium to the negative electrode in the lithium ion secondary battery is to reduce the irreversible capacity of the negative electrode and improve the charge / discharge capacity.
• the ratio of the irreversible capacity to the negative electrode capacity is about 0% to 20%. Therefore, an amount of lithium corresponding to at most 20% of the negative electrode capacity is applied to the negative electrode. I'll do it.
• the purpose of preliminarily occluding lithium ions in the negative electrode 21 is to increase the voltage of the capacitor by lowering the potential of the negative electrode 21.
• the potential of the positive electrode 22 is set to 4.0 V, for example, based on the oxidation-reduction potential of lithium.
• the negative electrode 22 In order to lower the potential of the negative electrode 22, it is necessary to store more lithium ions in the negative electrode 22. That is, it is necessary to occlude the anode 21 in advance in an amount corresponding to at least 50% or more, preferably 70% or more of the capacity of the anode 21.
• Japanese Patent Application Laid-Open No. 2007-128658 discloses a method of forming lithium layer 11 by directly depositing lithium on the surface of negative electrode 21.
• the required amount of lithium is applied to the electrochemical capacitor by this method, it depends on the radiation heat from the deposition source, the solidification heat of the deposited atoms on the negative electrode 21, the kinetic energy of the deposited atoms on the negative electrode 21, etc. Heat affects negative electrode 21.
• the binder component having low heat resistance contained in the electrode layer 5 is dissolved or decomposed by these heats, the electrode layer 5 is peeled off or the strength is lowered. This effect is particularly noticeable near the surface of the negative electrode 21.
• the negative electrode 21 since this heat is difficult to be uniformly transmitted to the long negative electrode 21 during vapor deposition, the negative electrode 21 locally expands or contracts.
• the precursor before the negative electrode 21 is cut into a predetermined size is, for example, as wide as 500 mm or more and as long as 1000 m.
• the precursor of the negative electrode 21 becomes in close contact with the cooling can in the deposition chamber. Therefore, the temperature of the precursor of the negative electrode 21 further rises, and finally, the feeding or winding of the precursor of the negative electrode 21 is hindered during vapor deposition. As a result, the negative electrode 21 cannot be produced.
• the surface of the negative electrode 21 is Transcript to.
• the element 1 as shown in FIG. 4 is manufactured by winding with the separator 6 interposed between the negative electrode 21 pretreated as described above and the positive electrode 22 described above.
• Electrolyte 9 was prepared by dissolving LiBF at a concentration of lmol / L in a mixed solvent in which ethylene carbonate with a high dielectric constant and jetty carbonate with a low viscosity were mixed at a weight ratio of 1: 1.
• the lead wires 7 A and 7 B drawn out from the element 1 are passed through the through holes provided in the sealing rubber 10, and the sealing rubber 10 is fitted into the opening of the case 8. Thereafter, the case 8 is sealed by drawing and curling the vicinity of the opening end of the case 8. In this way, an electrochemical capacitor is completed.
• Table 1 shows the results of measuring the capacitance / resistance characteristics of the electrochemical capacitor of Example 1 according to the present embodiment configured as described above.
• the measurement results of a comparative example using a conventional method in which a lithium foil is in contact with the negative electrode and immersed in an electrolyte, and the lithium foil is ionized and chemically occluded in a carbon material are shown in Table 1. .
• the lithium layer 11 is formed on the electrode layer 5 constituting the negative electrode 21 by transfer. Therefore, when the negative electrode 21 is manufactured, the electrode layer 5 is already in a state in which lithium ions are easily occluded. As a result, as shown in (Table 1) Example 1 and the comparative example show the same performance, but can greatly simplify or eliminate the post-process for occluding lithium ions. Although direct data is not shown, the lithium ion occlusion state with respect to the electrode layer 5 is stable, and an electrochemical capacitor having excellent performance can be produced.
• Table 2 shows the results of measuring the peel strength of the lithium layer 11 with respect to the substrate 31 by preparing the lithium layer 11 by vapor deposition using various materials for the substrate 31. In addition, the result of confirming whether or not transfer to the electrode layer 5 is confirmed is shown.
• the peel strength is measured in accordance with JIS-K 6854-1, “Adhesive ⁇ Peel Adhesive Strength Test Method Part 1: 90 degree peel”.
• the force exemplified by PP in Table 2 as a preferred material of the substrate 31 is applicable to the substrate 31 as long as the adhesion strength between the lithium layer 11 and the substrate 31 can be lowered.
• a material having high heat resistance that is difficult to form an alloy or react with lithium is preferable.
• the polymer material include polybutylene terephthalate, polyethylene terephthalate, polyethylene disulfide, polyamide, polyimide, and aramid. Even when such a material is used, the substrate 31 is cooled when the lithium layer 11 is formed by a vapor phase method so as not to reach a temperature at which the physical property change (softening or melting by heat) occurs.
• the temperature of the substrate 31 is set to be equal to or lower than the dew point of the atmosphere in and around the chamber in which the lithium layer 11 is formed by the vapor phase method, dew condensation occurs on the substrate 31 after the lithium layer 11 is formed. 11 may react. Therefore, the temperature of the substrate 31 is preferably higher than the dew point of the working atmosphere. For example, 0 ° C or higher is preferable. Since lithium reacts with moisture, the material including the lithium layer 11 needs to be handled in a moisture-controlled atmosphere. That is, the atmospheric dew point in the place where the substrate 31 including the lithium layer 11 and the electrode layer 5 on which the lithium layer 11 is transferred and the place where the transfer is performed needs to be lower than the ambient temperature.
• the lithium layer 11 is larger than the peel strength (149 N / m) of the electrode layer 5 with respect to the current collector 4.
• the lithium layer 11 cannot be transferred unless the peel strength of the substrate 31 is small.
• the results of measuring the peel strength of the electrode layer 5 on the current collector 4 and the peel strength of the lithium layer 11 on the substrate 31 in Sample No. 10 are shown in FIG.
• the temperature of the PP substrate 31 is maintained at 55 ° C., and the lithium layer 11 is formed on the substrate 31.
• the gripping movement speed when measuring peel strength is 50 mm / min.
• the peel strength of the lithium layer 11 with respect to the substrate 31 in Sample No. 10 is sufficiently smaller than the peel strength of the electrode layer 5 with respect to the current collector 4.
• the lithium layer 11 since the lithium layer 11 is peeled off in a short time, the lithium layer 11 can be transferred to the electrode layer 5 well.
• the carbon material is mainly described as the material constituting the electrode layer 5, but the present invention is not limited to this.
• the same effect can be obtained by using an alloy containing lithium in the composition, such as a lithium alloy, and a material whose capacity is increased by doping or occluding lithium.
• a release agent may be applied on the substrate 31 before forming the lithium layer 11 on the substrate 31. If the formation rate of the lithium layer 11 is increased in order to increase the productivity when the lithium layer 11 is produced, the temperature of the substrate 31 cannot be avoided. However, it is possible to perform good transfer by adjusting the adhesion strength in this way. Therefore, a release agent may be further applied to the substrate 31 using the substrate 31 and conditions as in the sample Nos. 9 and 10.
• organic substances having a relatively large molecular weight such as wax wax, or polybutyl alcohol
• An organic substance having a relatively small molecular weight such as tylene glycol is applicable.
• wax-based organic materials such as plant-based or animal-based waxes, mineral-based, petroleum-based, and synthetic waxes, wax-based organic materials, and alcohol-based organic materials are preferable. More preferred are fatty acids, hydrocarbons and esters, and even more preferred are esters of higher fatty acids with monovalent or divalent higher alcohols.
• an inorganic substance in which the force S described with an organic substance as the center and the particles are controlled to be square or uneven may be used.
• the particles having such a shape function as a release agent by reducing the contact area between the substrate 31 and the lithium layer 11.
• release agents remain on the surface of the lithium layer 11 after transfer to the surface of the electrode layer 5, though a small amount. Therefore, by analyzing the surface of the negative electrode 21 in the electrochemical capacitor or the surface of the separator 6 facing the negative electrode 21, it is possible to detect the substance derived from the release agent.
• the sum of the thickness of the electrode layer 5 before the lithium ion occlusion and the thickness of the lithium layer 11 is the electric current after the lithium ion occlusion. It is almost equal to the thickness of the polar layer 5. Therefore, it becomes easy to fix the negative electrode 21, the positive electrode 22, and the separator 6 inside the electrochemical capacitor, and it becomes easy to manufacture a highly reliable electrochemical capacitor. That is, by preliminarily laminating the electrode layer 5 with an amount of the lithium layer 11 commensurate with the expansion of the electrode layer 5 after occlusion of lithium ions, the pressure change inside the electrode can be reduced. As a result, a highly reliable electrochemical capacitor can be manufactured.
• the present invention is not limited to this, and a stacked element may be used.
• the electrode layers 3 and 5 need not necessarily be formed on both sides of the current collectors 2 and 4 and may be formed only on one side. The above-described electrode fixing effect can be obtained in the same manner when the stacked element 1 is manufactured, but is more remarkable when the wound element 1 is manufactured.
• anion 42 such as SO) N—.
• Example In 2 the current collector 4 is a copper foil having an average thickness of 15 whose front and back surfaces are roughened in advance. Except for this, an electrochemical capacitor was fabricated in the same manner as in Example 1. When the capacitance / resistance characteristics of the electrochemical capacitor according to Example 2 fabricated in this way were measured, the capacitance was 136F and the resistance was 42 ⁇ . That is, the electrochemical capacitor according to Example 2 shows performance superior to that of Comparative Example and Example 1. By roughening the surface of the current collector 4 in this way, the adhesion between the current collector 4 and the electrode layer 5 is improved, and the electrochemical capacitor is considered to have a low resistance.
• Example 3 an anchor layer having a thickness of 12 m is formed on the current collector 4 used in Example 2.
• the anchor layer is prepared by preparing an anchor layer coating solution and then applying it with a coater.
• the anchor layer coating solution is prepared by kneading and dispersing carbon black having an average particle size of 0.05 m in a carboxymethyl cellulose aqueous solution. Except for this, an electrode layer 5 was formed on the anchor layer in the same manner as in Example 1 to produce an electrochemical capacitor.
• the capacitance / resistance characteristics of the electrochemical capacitor according to Example 3 manufactured in this manner were measured, the capacitance was 139F and the resistance was 39 ⁇ .
• the electrochemical capacitor according to Example 3 shows performance superior to that of the comparative example and Examples 1 and 2.
• the adhesion between the current collector 4 and the electrode layer 5 is further improved, and the electrochemical capacitor is considered to have a low resistance. .
• the occlusion state of lithium ions with respect to the electrode layer of the negative electrode is stable, and excellent performance is achieved.
• An electrochemical capacitor having the following can be obtained stably.
• productivity can be improved. It is particularly useful as a backup power source and regenerative power for hybrid vehicles and fuel cell vehicles.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Power Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)
• Secondary Cells (AREA)
• Battery Electrode And Active Subsutance (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38923248

Family Applications (1)

Country Status (5)

Cited By (13)

Families Citing this family (12)

Citations (5)

Family Cites Families (15)

• 2006
  • 2006-07-14 JP JP2006193827A patent/JP5372318B2/ja not_active Expired - Fee Related
• 2007
  • 2007-07-11 EP EP07790607A patent/EP2043116B1/en not_active Not-in-force
  • 2007-07-11 US US12/302,357 patent/US8034642B2/en not_active Expired - Fee Related
  • 2007-07-11 CN CN2007800240696A patent/CN101479820B/zh not_active Expired - Fee Related
  • 2007-07-11 WO PCT/JP2007/063803 patent/WO2008007692A1/ja not_active Ceased

Patent Citations (5)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events