WO2023182269A1 - 電気化学デバイスおよび電気化学デバイスの製造方法 - Google Patents

電気化学デバイスおよび電気化学デバイスの製造方法 Download PDF

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WO2023182269A1
WO2023182269A1 PCT/JP2023/010877 JP2023010877W WO2023182269A1 WO 2023182269 A1 WO2023182269 A1 WO 2023182269A1 JP 2023010877 W JP2023010877 W JP 2023010877W WO 2023182269 A1 WO2023182269 A1 WO 2023182269A1
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Prior art keywords
electrode
separator
negative electrode
winding shaft
winding
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English (en)
French (fr)
Japanese (ja)
Inventor
奈穂 宮口
信敬 武田
充裕 藤田
祐介 中村
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to US18/849,184 priority Critical patent/US20250210281A1/en
Priority to CN202380029925.6A priority patent/CN118946943A/zh
Priority to JP2024510163A priority patent/JPWO2023182269A1/ja
Publication of WO2023182269A1 publication Critical patent/WO2023182269A1/ja
Anticipated expiration legal-status Critical
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    • 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
    • H01G13/02—Machines for winding 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
    • H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
    • 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
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/32—Carbon-based
    • H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
    • 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
    • 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
    • H01G11/52—Separators
    • 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
    • H01G11/66—Current collectors
    • H01G11/70—Current collectors characterised by their structure
    • 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
    • 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
    • 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
    • H01M10/04—Construction or 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • 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

Definitions

  • the present disclosure relates to an electrochemical device and a method for manufacturing an electrochemical device.
  • An electric double layer capacitor which is an example of an electrochemical device, has a long life, can be rapidly charged, and has excellent output characteristics. Therefore, electric double layer capacitors are widely used in backup power supplies and the like.
  • Examples of electrochemical devices include wound type electrochemical devices and stacked type electrochemical devices. Conventionally, various wound-type power storage devices have been proposed.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2017-188541 describes a method for manufacturing a capacitor including a capacitor element in which a separator is laminated and wound between an anode foil and a cathode foil, are integrated to form a support part that supports the anode foil, and the anode foil, the cathode foil, and the separator are connected while applying a tensile force acting on the separator to the anode foil through the support part.
  • a method for manufacturing a capacitor the method comprising a step of winding the capacitor.”
  • Patent Document 2 Japanese Unexamined Patent Application Publication No. 2020-188193 describes a "wound capacitor comprising a capacitor element and an exterior case in which the capacitor element is housed in a state impregnated with an electrolyte, the capacitor element comprising: A wound body formed by winding an electrode foil serving as an anode and an electrode foil serving as a cathode with a sheet-like separator interposed therebetween; an electrode foil wound around the outer periphery of the wound body to serve as the anode, and the cathode.
  • the winding start end face of the element fixing tape is arranged to face the end face of the winding end of the electrode foil disposed radially inwardly of the electrode foil in the winding direction of the wound body, and the other end is opposite to the end face of the winding end of the electrode foil.
  • a wound type capacitor characterized in that it is fixed to the surface of a.
  • one of the objects of the present disclosure is to provide a wound-type electrochemical device that can be manufactured with high yield and is highly reliable.
  • the wound body may not be able to maintain its state at the time of device manufacture and may loosen (unwind).
  • unwinding is likely to occur.
  • the wound body unwinds, the distance between the electrodes varies. As a result, problems such as increased internal resistance and increased variations in performance arise.
  • One of the objects of the present disclosure is to provide an electrochemical device in which unwinding of the wound body is less likely to occur.
  • the first manufacturing method provides an electrochemical device including a wound body composed of a band-shaped positive electrode containing activated carbon as a positive electrode material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode.
  • a manufacturing method comprising: (i) sandwiching a part of one end of the negative electrode and a part of one end of the separator between a first winding shaft and a second winding shaft; The first winding shaft and the second winding shaft are rotated while the part of the negative electrode and the part of the separator are sandwiched between the winding shaft and the second winding shaft, thereby forming the positive electrode. and a step (ii) of forming the wound body by winding the negative electrode and the separator, and in the step (ii), both surfaces of the positive electrode face the negative electrode.
  • the positive electrode, the negative electrode, and the separator are wound.
  • the first electrochemical device includes an electrically wound body including a band-shaped positive electrode containing activated carbon as a positive electrode active material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode.
  • the wound body includes a winding shaft portion formed between winding shafts, and a winding portion connected to the winding shaft portion, and the winding shaft portion is connected to one end side of the negative electrode. and a part of one end side of the separator, and in the wound body, the positive electrode, the negative electrode, and the separator are wound so that both surfaces of the positive electrode face the negative electrode.
  • the second manufacturing method includes an electrically wound body comprising a strip-shaped positive electrode containing activated carbon as a positive electrode material, a strip-shaped negative electrode, and a strip-shaped separator disposed between the positive electrode and the negative electrode.
  • a method for manufacturing a chemical device comprising: The separator includes a strip-shaped first separator and a strip-shaped second separator,
  • the manufacturing method includes: a step (I) of sandwiching only a part of one end side of the first and second separators between winding shafts; Step (II) of forming the wound body by rotating the winding shaft while maintaining the state of Step (I) and winding the positive electrode, the negative electrode, and the first and second separators.
  • the winding shaft is constituted by first and second winding shafts having a semicircular cross section with a diameter of length A, the first separator has an average thickness T1; the second separator has an average thickness T2;
  • the distance B between the one end of the negative electrode on the winding shaft side and the winding shaft and the length A satisfy ⁇ A ⁇ B
  • the distance C between the winding shaft side end of the positive electrode and the one end of the negative electrode, the length A, the average thickness T1, and the average thickness T2 are ⁇ (A+(T1+T2) ⁇
  • the winding is performed in a state that satisfies 2n) ⁇ C (where n is the number of turns in which only the first and second separators are wound).
  • the second electrochemical device includes an electrically wound body including a band-shaped positive electrode containing activated carbon as a positive electrode active material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode.
  • the separator includes a strip-shaped first separator and a strip-shaped second separator
  • the wound body includes a winding shaft portion formed between winding shafts, and a winding portion connected to the winding shaft portion,
  • the winding shaft portion is constituted only by the first and second separators
  • the winding shaft portion includes a first end that is a boundary with the winding portion, and a second end opposite to the first end
  • the winding part includes a reinforcing part in which only the first and second separators are wound one or more times between the first end and one end of the negative electrode on the winding shaft part side.
  • a surface of the positive electrode on the side of the winding shaft portion faces the negative electrode.
  • the third electrochemical device includes a strip-shaped first electrode, a strip-shaped second electrode, and a strip-shaped separator disposed between at least the first electrode and the second electrode.
  • the outermost periphery of the second electrode is located outside the outermost periphery of the first electrode, and the vicinity of the outer periphery of the second electrode is bent so that the outermost periphery of the second electrode is The outer peripheral end of the second electrode is in contact with the separator.
  • a wound-type electrochemical device that can be manufactured with high yield and is highly reliable can be obtained. According to another aspect of the present disclosure, it is possible to obtain an electrochemical device in which the wound body is less likely to unwind.
  • FIG. 2 is a cross-sectional view schematically showing one step of the manufacturing method of Embodiment 1.
  • FIG. 1B is a top view of FIG. 1A.
  • 3 is a cross-sectional view schematically showing an example of a wound body manufactured by the manufacturing method of Embodiment 1.
  • FIG. 1 is a partially exploded perspective view schematically showing the electrochemical device of Embodiment 1.
  • FIG. 7 is a cross-sectional view schematically showing one step of the manufacturing method of Embodiment 2.
  • FIG. 4B is a top view of FIG. 4A.
  • FIG. 3 is a cross-sectional view schematically showing an example of a wound body manufactured by the manufacturing method of Embodiment 2.
  • FIG. 3 is a partially exploded perspective view schematically showing an electrochemical device of Embodiment 2.
  • FIG. 7 is a cross-sectional view schematically showing a part of an example of a wound body used in the electrochemical device of Embodiment 3. It is a figure which shows typically one process of an example of the manufacturing method of a wound body.
  • FIG. 7 is a partially exploded perspective view schematically showing an example of an electrochemical device according to a third embodiment.
  • the electrochemical devices (D1), (D2), and (D3) will be described below. At least a portion of the configurations of the electrochemical devices (D1), (D2), and (D3) may be combined as long as no technical contradiction occurs.
  • the first manufacturing method according to the present embodiment is an electric battery including a wound body composed of a band-shaped positive electrode containing activated carbon as a positive electrode material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode.
  • This is a method for manufacturing a chemical device.
  • the first manufacturing method may be hereinafter referred to as "manufacturing method (M1)."
  • the manufacturing method (M1) includes step (i) and step (ii) in this order. These steps will be explained below.
  • Step (i) is a step in which a part of one end of the negative electrode and a part of one end of the separator are sandwiched between a first winding shaft and a second winding shaft.
  • first winding shaft and the second winding shaft any members may be used as long as they serve as winding shafts when forming a wound body.
  • each of the first winding shaft and the second winding shaft may be a rod-shaped body having a semicircular cross section.
  • the separator may include a first separator and a second separator.
  • step (i) involves moving a part of one end side of the negative electrode, a part of one end side of the first separator, and a part of one end side of the second separator to the first winding shaft and the second winding shaft. It may also be a step of sandwiching it between the shaft and the shaft. In that case, the negative electrode may be sandwiched between the first separator and the second separator.
  • step (i) may be a step in which a part of one end of the negative electrode and a part of one end of the first separator are sandwiched between a first winding shaft and a second winding shaft.
  • the band-shaped separator may be bent to stack two sheets, and the two stacked separators may be used as the first and second separators.
  • Step (ii) is rotating the first winding shaft and the second winding shaft with a part of the negative electrode and a part of the separator sandwiched between the first winding shaft and the second winding shaft.
  • This is a step of forming the above-mentioned wound body by winding the positive electrode, the negative electrode, and the separator.
  • the positive electrode, negative electrode, and separator are wound so that both sides of the positive electrode face the negative electrode.
  • step (ii) is performed while maintaining the state in step (i) (that is, the state in which part of the negative electrode and part of the separator are sandwiched between the first winding shaft and the second winding shaft). It will be done.
  • the positive electrode, the negative electrode, and the separator during winding, a wound body composed of them is formed.
  • the winding may be performed as follows, for example. Regarding the portion close to the winding axis, first only the negative electrode and separator are wound without winding the positive electrode, and then the positive electrode, negative electrode, and separator are wound together. Next, the outer peripheral portion of the wound body is wound so that the negative electrode is disposed outside the positive electrode. By doing so, the wound body can be formed such that both sides of the positive electrode face the negative electrode.
  • the negative electrode and the separator are wound together at the winding shaft portion, so that winding misalignment of the negative electrode can be prevented. Therefore, according to the manufacturing method (M1), a highly reliable wound type electrochemical device can be manufactured with a high yield.
  • a wound body is formed such that both surfaces of the positive electrode face the negative electrode. According to this configuration, deterioration of the separator can be suppressed in some cases. If there is a part of the positive electrode that does not face the negative electrode (non-opposing part), hydrogen ions (H + ) generated at the positive electrode are difficult to diffuse, so a local acidic atmosphere is formed in this part. In an acidic atmosphere, a dehydration reaction of the separator occurs and water is generated within the cell, causing rapid deterioration of the cell. According to the manufacturing method (M1), it is possible to manufacture a wound body in which there is no non-opposed portion of the positive electrode, so these problems can be suppressed.
  • a part of the one end side of the negative electrode and the above part of the separator are connected so that one end of the negative electrode protrudes from between the first winding shaft and the second winding shaft.
  • a part of the one end side may be sandwiched between the first winding shaft and the second winding shaft.
  • a part of one end of the negative electrode and a part of one end of the separator are connected to each other so that one end of the negative electrode and one end of the separator protrude from between the first winding shaft and the second winding shaft. It may be sandwiched between the first winding shaft and the second winding shaft.
  • the positive electrode does not need to be sandwiched between the first winding shaft and the second winding shaft in step (i). According to this configuration, both surfaces of the positive electrode can completely face the negative electrode.
  • a rolled body can be formed.
  • the obtained wound body is enclosed in an exterior body together with an electrolyte as required.
  • a lead is connected to the positive electrode and/or the negative electrode before or after manufacturing the wound body. In this way, an electrochemical device is obtained. Electrochemical devices can be used as power storage devices.
  • the first electrochemical device includes a wound body composed of a band-shaped positive electrode containing activated carbon as a positive electrode active material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode. include.
  • the first electrochemical device may be hereinafter referred to as an "electrochemical device (D1)".
  • the electrochemical device (D1) can be manufactured by the manufacturing method (M1), it may be manufactured by a manufacturing method other than the manufacturing method (M1). Since the matters explained regarding the manufacturing method (M1) can be applied to the electrochemical device (D1), duplicate explanations may be omitted. Further, the matters described for the electrochemical device (D1) may be applied to the manufacturing method (M1).
  • the wound body includes a winding shaft portion formed between winding shafts (for example, two winding shafts), and a winding portion continuous with the winding shaft portions.
  • the winding shaft portion includes a portion on one end side of the negative electrode and a portion on one end side of the separator.
  • a positive electrode, a negative electrode, and a separator are wound so that both sides of the positive electrode face the negative electrode.
  • the winding shaft portion is a portion that is sandwiched between the first winding shaft and the second winding shaft when manufacturing the winding body.
  • the winding shaft portion is arranged so as to partition a cylindrical space present at the center of the wound body into two semi-cylindrical spaces.
  • the electrochemical device (D1) In the electrochemical device (D1), the negative electrode and the separator are bent at the boundary between the winding shaft part and the winding part. Therefore, in the electrochemical device (D1), it is possible to suppress winding misalignment and loosening of the wound body. Therefore, the electrochemical device (D1) can be manufactured with high yield and has high reliability.
  • the wound body may further include a protrusion connected to the winding shaft portion on the side opposite to the wound portion.
  • the protrusion may include the one end of the negative electrode.
  • the protrusion may include the one end of the negative electrode and the one end of the separator. According to these configurations, since the negative electrode is bent twice before and after the protrusion, loosening of the wound body can be particularly suppressed.
  • the winding shaft portion does not need to include a positive electrode. According to this configuration, both surfaces of the positive electrode can completely face the negative electrode.
  • the electrochemical device (D1) includes a wound body and is, for example, cylindrical.
  • the electrochemical device (D1) may be an electric double layer capacitor (EDLC) or another power storage device (for example, a lithium ion capacitor).
  • EDLC electric double layer capacitor
  • a polarizable electrode includes an electrode material (active material) that is capable of adsorbing and desorbing ions. Charging and discharging are performed by the electrode material adsorbing and desorbing ions.
  • a polarizable electrode can be used as the positive electrode
  • a non-polarizable electrode can be used as the negative electrode.
  • the negative electrode which is a non-polarizable electrode
  • a negative electrode used in a lithium ion secondary battery may be used. Examples of such negative electrodes include negative electrode active materials (eg, graphite) that are capable of intercalating and deintercalating lithium ions.
  • the second manufacturing method uses a wound body composed of a band-shaped positive electrode containing activated carbon as a positive electrode material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode.
  • a method for manufacturing an electrochemical device including the present invention may be hereinafter referred to as "manufacturing method (M2)."
  • the separator includes a strip-shaped first separator and a strip-shaped second separator.
  • the manufacturing method (M2) includes step (I) and step (II) in this order. These steps will be explained below.
  • Step (I) is a step in which only a portion of one end side of the first and second separators is sandwiched between the winding shafts.
  • the winding shaft is constituted by a first winding shaft and a second winding shaft.
  • the first and second winding shafts each have a semicircular cross section (for example, a half cross section of a perfect circle) with a diameter of length A (mm).
  • Step (II) is a step of forming the above-mentioned wound body by rotating the winding shaft while maintaining the state of step (I) and winding the positive electrode, the negative electrode, and the first and second separators. be.
  • the band-shaped first separator has an average thickness T1 (mm).
  • the band-shaped second separator has an average thickness T2 (mm). Note that the band-shaped separator may be bent to stack two sheets, and the two stacked separators may be used as the first and second separators.
  • winding is performed in step (II) so as to satisfy the following conditions (a) and (b).
  • (b) Distance C (mm) between one end of the winding shaft side of the positive electrode and one end of the negative electrode, length A, average thickness T1, and average thickness T2 are ⁇ (A+(T1+T2) ⁇ 2n) ⁇ C (where n is the number of turns of only the first and second separators). More specifically, n is the number of turns of only the first and second separators on the winding shaft side, and is the number of turns of the first and second separators in the portion that becomes the reinforcing portion.
  • step (II) winding is performed so as to satisfy the following conditions (a') and (b').
  • step (a') After winding only the first and second separators one turn or more, winding of the negative electrode is started.
  • step (b') Among the surfaces of the positive electrode, the surface on the winding shaft side faces the negative electrode.
  • condition (a) or (a') When condition (a) or (a') is satisfied, the negative electrode does not come into contact with the winding shaft. Therefore, damage to the negative electrode can be suppressed. As a result, highly reliable electrochemical devices can be manufactured with high yield.
  • condition (b) or (b') it is possible to prevent a part of the positive electrode from becoming a part (non-opposing part) that does not face the negative electrode on the winding shaft side. According to this configuration, deterioration of the separator can be suppressed in some cases. If a part of the positive electrode has a non-facing part that does not face the negative electrode, in the non-facing part, negative ions are adsorbed and concentrated near the positive electrode during charging, but there is no negative electrode to which positive ions are adsorbed. As a result, positive ions crowd the separator, causing an imbalance of ions. As a result, the separator may become carbonized. According to the manufacturing method (M2), it is possible to manufacture a wound body in which there is no non-opposed portion of the positive electrode, so these problems can be suppressed.
  • step (II) first, a laminated structure of "first separator/second separator” is wound, and then a laminated structure of "first separator/negative electrode/second separator” is wound. Then, a laminated structure of "first separator/negative electrode/second separator/positive electrode” is wound.
  • step (II) winding may be performed so as to satisfy the following condition (c) or (c').
  • (c') After winding only the first and second separators two or more times, winding of the negative electrode is started.
  • condition (c) or (c') it is possible to reinforce the part of the wound body in which only the separator is wound (the central part of the wound body). Therefore, when the winding shaft is removed after winding is completed, short circuits due to breakage of the separator can be suppressed.
  • the distance B and the length A may satisfy B ⁇ 3 ⁇ A. That is, the number of turns in which only the first and second separators are wound may be three turns or less.
  • a wound body may be formed such that both sides of the positive electrode face the negative electrode. According to this configuration, deterioration of the separator can be particularly suppressed.
  • both sides of the positive electrode near the winding shaft face the negative electrode.
  • the outer peripheral portion of the wound body is wound so that the negative electrode is disposed outside the positive electrode. By doing so, the wound body can be formed such that both sides of the positive electrode face the negative electrode.
  • step (I) only the above-mentioned portions of the first and second separators are rolled so that the one ends of the first and second separators protrude from between the first winding shaft and the second winding shaft. may be sandwiched between the winding shafts. According to this configuration, since the separator is bent twice before and after the winding shaft, winding misalignment of the separator can be suppressed. Therefore, electrochemical devices with higher reliability can be manufactured with higher yield.
  • a rolled body can be formed.
  • the obtained wound body is enclosed in an exterior body together with an electrolyte as required.
  • a lead is connected to the positive electrode and/or the negative electrode before or after manufacturing the wound body. In this way, an electrochemical device is obtained. Electrochemical devices can be used as power storage devices.
  • the second electrochemical device includes a wound body composed of a band-shaped positive electrode containing activated carbon as a positive electrode active material, a band-shaped negative electrode, and a band-shaped separator disposed between the positive electrode and the negative electrode. include.
  • the second electrochemical device may be hereinafter referred to as an "electrochemical device (D2)".
  • the electrochemical device (D2) can be manufactured by the manufacturing method (M2). Since the matters explained regarding the manufacturing method (M2) can be applied to the electrochemical device (D2), duplicate explanations may be omitted. Further, the matters described for the electrochemical device (D2) may be applied to the manufacturing method (M2).
  • the separator includes a strip-shaped first separator and a strip-shaped second separator.
  • the wound body includes a winding shaft portion formed between the winding shafts, and a winding portion connected to the winding shaft portions.
  • the winding shaft portion is made up of only the first and second separators.
  • the winding shaft portion includes a first end that is a boundary with the winding portion, and a second end opposite to the first end.
  • the winding part includes a reinforcing part in which only the first and second separators are wound one or more times between the first end and one end on the winding shaft part side of the negative electrode.
  • the surface of the positive electrode on the winding shaft side faces the negative electrode.
  • the winding shaft portion is formed by being sandwiched between the first winding shaft and the second winding shaft.
  • the winding shaft portion is arranged so as to partition a cylindrical space present at the center of the wound body into two semi-cylindrical spaces.
  • the electrochemical device (D2) According to the electrochemical device (D2), the effects obtained by satisfying the above conditions (a) (or (a')) and (b) (or (b')) can be obtained. Therefore, the electrochemical device (D2) can be manufactured with high yield and has high reliability.
  • only the first and second separators may be wound two or more times.
  • both sides of the positive electrode may face the negative electrode.
  • the wound body of the electrochemical device (D2) may include only the first and second separators, and may include a protrusion protruding from the second end.
  • the electrochemical device (D2) includes a wound body and is, for example, cylindrical.
  • the electrochemical device (D2) may be an electric double layer capacitor (EDLC) or another power storage device (for example, a lithium ion capacitor).
  • EDLC electric double layer capacitor
  • a polarizable electrode includes an electrode material (active material) that is capable of adsorbing and desorbing ions. Charging and discharging are performed by the electrode material adsorbing and desorbing ions.
  • a polarizable electrode can be used as the positive electrode
  • a non-polarizable electrode can be used as the negative electrode.
  • the negative electrode which is a non-polarizable electrode
  • a negative electrode used in a lithium ion secondary battery may be used. Examples of such negative electrodes include negative electrode active materials (eg, graphite) that are capable of intercalating and deintercalating lithium ions.
  • the electrochemical device (D3) includes a first strip-shaped electrode, a second strip-shaped electrode, and a strip-shaped separator disposed between at least the first electrode and the second electrode. It includes a rolled body made up of. The outermost periphery of the second electrode is located outside the outermost periphery of the first electrode. The vicinity of the outer peripheral end of the second electrode is bent so that the outer peripheral end of the second electrode is in contact with the separator. The outer peripheral end of the second electrode may be hereinafter referred to as the "outer peripheral end (E2)."
  • the outer peripheral end (E2) comes into contact with the surface of the separator.
  • misalignment between the outer peripheral end (E2) and the separator is suppressed, and unwinding of the wound body is suppressed.
  • This configuration can be achieved by bending the vicinity of the outer peripheral end (E2) of the second electrode. Therefore, compared to the method of fixing the outer periphery of the wound body using tape, the process is easier and can be carried out at lower cost.
  • the first electrode may be a positive electrode and the second electrode may be a negative electrode, or the first electrode may be a negative electrode and the second electrode may be a positive electrode.
  • the first electrode may be an anode and the second electrode may be a cathode, or the first electrode may be a cathode and the second electrode may be an anode.
  • the first and second electrodes may not have specified polarities.
  • the separator typically includes a first separator and a second separator.
  • the vicinity of the outer circumferential end (E2) of the second electrode is bent toward the inside of the wound body, and the outer circumferential end (E2) is in contact with the separator present inside the outer circumferential end (E2). come into contact with Since the vicinity of the outer peripheral end (E2) is bent inward, the separator can be pressed down with the bent surface that abuts the separator, so the distance between the electrodes ( The distance between the first electrode 2 and the second electrode 3 in FIG. 7) can be suppressed, and the resistance value, which is a characteristic of the device, can be suppressed and the resistance value can be stabilized.
  • first and second separators are laminated inside the outer peripheral end (E2).
  • the outer peripheral end (E2) faces the inner second electrode with the separator in between. According to this configuration, it is possible to prevent the outer peripheral end (E2) from damaging the separator and causing a short circuit between the first electrode and the second electrode.
  • the second example can be adopted when a separator exists outside the outer peripheral end (E2) of the second electrode.
  • the vicinity of the outer circumferential end (E2) of the second electrode is bent toward the outside of the wound body, and the outer circumferential end (E2) is in contact with a separator that exists outside the outer circumferential end (E2). come into contact with
  • the above effect stabilization of the resistance value
  • the outer peripheral end (E2) does not come into contact with the first electrode. Therefore, short circuit between the first electrode and the second electrode can be further suppressed.
  • the first electrode includes a first current collector and a first mixture layer formed on both sides of the first current collector
  • the second electrode includes a second current collector and a first mixture layer formed on both sides of the first current collector. and a second mixture layer formed on both surfaces of the second current collector.
  • the second current collector may be exposed at the end face of the outer peripheral edge while being sandwiched between the second mixture layers. By exposing the second current collector to the end face, it becomes difficult for the second current collector and the separator to become misaligned. Furthermore, since the second current collector is sandwiched between the mixture layers, the edges of the second current collector are appropriately protected, and the separator is prevented from being damaged by the edges of the second current collector. It can be suppressed.
  • the position of the bent part (bent part) of the second electrode is at least 0.01 mm, at least 0.1 mm, or at least 0.2 mm away from the outer peripheral edge (E2) of the second electrode. Good too.
  • the position of the bent portion may be within a range of 0.5 mm or less, or 0.3 mm or less from the outer peripheral end (E2) of the second electrode.
  • a portion where the second electrode is bent (bent portion) in a range of 0.01 mm to 0.5 mm (for example, a range of 0.1 mm to 0.5 mm) from the outer peripheral edge (E2) of the second electrode. may exist. According to this configuration, the effect of preventing the winding body from unwinding becomes particularly high. Note that these distances are distances measured along the longitudinal direction of the electrode.
  • the angle ⁇ (see FIG. 8) at which the second electrode is bent at the bent portion is 90° or less.
  • the angle ⁇ may be 5° or more, 15° or more, or 30° or more.
  • the angle ⁇ may be less than or equal to 90°, less than or equal to 60°, less than or equal to 45°, or less than or equal to 30°.
  • the angle ⁇ may be in the range 15-60°, in the range 30-60°, or in the range 15-45°.
  • outer peripheral end (E1)) of the first electrode is bent so that the outer peripheral end (E1) of the first electrode becomes a separator. They may be in contact with each other. According to this configuration, it is possible to suppress misalignment between the first electrode and the separator. Therefore, unwinding of the wound body can be particularly suppressed.
  • the direction in which the outer peripheral end (E1) of the first electrode is bent may be either inside or outside.
  • the direction in which the outer peripheral end (E1) of the first electrode is bent may be the same as or different from the direction in which the outer peripheral end (E2) of the second electrode is bent (inside or outside).
  • the electrochemical device (D3) includes a wound body and is, for example, cylindrical.
  • the electrochemical device (D3) may be an electric double layer capacitor (EDLC) or another power storage device (for example, a lithium ion capacitor).
  • the electrochemical device may be another capacitor or battery.
  • EDLC electric double layer capacitor
  • the electrochemical device may be another capacitor or battery.
  • the first and second electrodes of the electrochemical device (D3) electrodes suitable for the device may be used, and known electrodes suitable for the device may be used.
  • polarizable electrodes can be used as the positive electrode and the negative electrode.
  • a polarizable electrode includes an electrode material (active material) that is capable of adsorbing and desorbing ions. Charging and discharging are performed by the electrode material adsorbing and desorbing ions.
  • the electrochemical device (D3) is a lithium ion capacitor
  • a polarizable electrode can be used as the positive electrode
  • a non-polarizable electrode can be used as the negative electrode.
  • the negative electrode which is a non-polarizable electrode
  • a negative electrode used in a lithium ion secondary battery may be used. Examples of such negative electrodes include negative electrode active materials (eg, graphite) that are capable of intercalating and deintercalating lithium ions.
  • the electrochemical devices (D1) and (D2) are electric double layer capacitors
  • the electrochemical devices (D1) and (D2) are electrochemical devices other than electric double layer capacitors
  • electrodes, separators, and electrolytes may be selected depending on the type.
  • the positive electrode (positive electrode plate) includes a strip-shaped positive electrode current collector and positive electrode mixture layers arranged on both sides of the positive electrode current collector.
  • the positive electrode mixture layer contains activated carbon, which is a positive electrode material (active material).
  • the positive electrode mixture layer contains activated carbon, which is a positive electrode material, as an essential component.
  • the positive electrode material may include carbon materials other than activated carbon. Examples of such carbon materials include carbon nanotubes, graphite, graphene, and the like.
  • Raw materials for activated carbon include, for example, wood, coconut shells, pulp waste, coal or coal-based pitch obtained by thermal decomposition thereof, heavy oil or petroleum-based pitch obtained by thermal decomposition thereof, phenolic resin, petroleum coke, coal coke. etc.
  • the activated carbon is preferably activated carbon.
  • the positive electrode mixture layer may contain components other than the positive electrode material (active material).
  • other components include a binder, a conductive material, and the like.
  • the binder for example, resin materials such as polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), etc. are used.
  • the conductive material carbon black (for example, acetylene black, etc.) is used.
  • a strip-shaped metal foil (for example, aluminum foil) can be used as the positive electrode current collector.
  • the thickness of the positive electrode current collector is not particularly limited.
  • the thickness of the positive electrode current collector of the electrochemical device (D1) may be in the range of 10 ⁇ m to 50 ⁇ m (for example, in the range of 15 ⁇ m to 30 ⁇ m).
  • the thickness of the positive electrode current collector of the electrochemical device (D2) may be in the range of 10 ⁇ m to 50 ⁇ m (for example, in the range of 20 ⁇ m to 30 ⁇ m).
  • the surface of the positive electrode current collector may be roughened by a method such as etching (the same applies to the negative electrode current collector).
  • the negative electrode (negative electrode plate) includes a strip-shaped negative electrode current collector and negative electrode mixture layers disposed on both sides of the negative electrode current collector.
  • the negative electrode mixture layer contains a negative electrode material (active material).
  • the negative electrode material includes a negative electrode material (active material) capable of adsorbing and desorbing ions. Examples of negative electrode materials include carbon materials, and the carbon materials exemplified as positive electrode materials may also be used. Specifically, activated carbon, hard carbon, carbon nanotubes, graphite, graphene, etc. may be used as the negative electrode material.
  • the negative electrode mixture layer may contain components other than the negative electrode material (active material).
  • examples of other components include a binder and a conductive material.
  • the binder and the conductive material the substances exemplified as the binder and the conductive material of the positive electrode may be used.
  • a strip-shaped metal foil (for example, aluminum foil) can be used as the negative electrode current collector.
  • the thickness of the negative electrode current collector may be in the range of 5 ⁇ m to 50 ⁇ m (for example, in the range of 5 ⁇ m to 20 ⁇ m).
  • the thickness of the negative electrode current collector of the electrochemical device (D2) may be in the range of 10 ⁇ m to 50 ⁇ m (for example, in the range of 20 ⁇ m to 30 ⁇ m).
  • the method for forming the above electrodes is not limited, and may be formed by any known method.
  • the mixture layer may be formed by the following method. First, a slurry is prepared by mixing an electrode material (active material), a binder and/or a conductive material, and a dispersion medium. Next, the obtained slurry is applied to the surface of the current collector to form a coating film. Next, the coating film is dried and rolled to form a mixture layer on the surface of the current collector. In this way, a mixture layer is formed.
  • the separator is placed between the positive electrode and the negative electrode to prevent short circuits between the positive electrode and the negative electrode.
  • materials for the separator include insulating resin and glass.
  • examples of the separator include a nonwoven fabric mainly composed of cellulose, a glass fiber mat, and a microporous film of polyolefin such as polyethylene.
  • the separator may be a known separator used in electric double layer capacitors or lithium ion capacitors.
  • the thickness of the separator of the electrochemical device (D1) is not particularly limited, and may be in the range of 15 ⁇ m to 60 ⁇ m (for example, in the range of 20 ⁇ m to 40 ⁇ m).
  • the average thicknesses T1 and T2 of the separator of the electrochemical device (D2) are not particularly limited, and each may be in the range of 10 ⁇ m to 50 ⁇ m (for example, in the range of 15 ⁇ m to 40 ⁇ m).
  • the average thickness of the separator is measured using the following procedure. First, a test piece with a length of about 500 mm is folded over twice, and the thickness is measured at five equally spaced points. The average thickness is calculated by dividing the arithmetic mean of the measured thicknesses at five points by the number of stacked sheets. Usually, the same separator is used for the first separator and the second separator. In that case, the average thickness T1 of the first separator may be set as the average thickness T2 of the second separator.
  • electrolyte As the electrolyte, an electrolyte containing a solvent and an ionic substance can be used.
  • electrolytes include nonaqueous electrolytes containing a nonaqueous solvent and an ionic substance. Ionic substances are dissolved in a solvent and include cations and anions.
  • the ionic substance may include a low melting point compound (ionic liquid) that can exist as a liquid at around room temperature. The concentration of the ionic substance in the electrolyte is, for example, 0.5 mol/L or more and 2.0 mol/L.
  • the solvent may also contain a lactone compound.
  • lactone compounds include ⁇ -propiolactone, ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, and the like.
  • the lactone compound preferably contains ⁇ -butyrolactone (GBL) because it has a low viscosity even at low temperatures, is electrochemically stable in the voltage range of the device, and releases a small amount of gas.
  • the solvent may contain other solvents than the lactone compound.
  • other solvents include chain carboxylic acid esters such as methyl propionate, chain carbonate esters such as diethyl carbonate, cyclic carbonate esters such as propylene carbonate, and polyhydric alcohols such as ethylene glycol and propylene glycol.
  • cyclic sulfones such as sulfolane, amides such as N-methylacetamide, N,N-dimethylformamide, and N-methyl-2-pyrrolidone
  • ethers such as 1,4-dioxane
  • ketones such as methyl ethyl ketone, formaldehyde, etc.
  • the solvent may include acetonitrile.
  • the proportion of the lactone compound in the solvent may be 50 volume % or more and 85 volume % or less.
  • the ionic substance includes, for example, an organic salt.
  • An organic salt is a salt in which at least one of an anion and a cation contains an organic substance.
  • organic salts in which the cation includes an organic substance include quaternary ammonium salts.
  • organic salts in which the anion (or both ions) contain an organic substance include trimethylamine maleate, triethylamine borodisalicylate, ethyldimethylamine phthalate, mono-1,2,3,4-tetramethylimidazolinium phthalate, and phthalate. Examples include mono-1,3-dimethyl-2-ethylimidazolinium acid.
  • the anion preferably includes an anion of a fluorine-containing acid from the viewpoint of improving withstand voltage characteristics.
  • the anion of the fluorine-containing acid include BF 4 - and/or PF 6 - .
  • the organic salt preferably contains, for example, a cation of a tetraalkylammonium and an anion of a fluorine-containing acid. Specific examples include diethyldimethylammonium tetrafluoroborate (DEDMABF 4 ), triethylmethylammonium tetrafluoroborate (TEMABF 4 ), and the like.
  • the ionic material includes a lithium salt.
  • the lithium salt is preferably a salt having a fluorine-containing anion.
  • the salts having a fluorine-containing anion at least one selected from the group consisting of LiBF 4 , LiPF 6 , and lithium bis(fluorosulfonyl)imide (LiN(SO 2 F) 2 ) is more preferable.
  • LiN(SO 2 F) 2 is also referred to as LiFSI or LFSI.
  • salts having a fluorine-containing anion LFSI is less likely to produce by-products and has excellent stability.
  • the electrochemical device (D3) is an electric double layer capacitor in which the first electrode is a positive electrode and the second electrode is a negative electrode.
  • the electrochemical device (D3) is an electrochemical device other than an electric double layer capacitor, electrodes, separators, and electrolytes may be selected depending on the type.
  • the positive electrode (positive electrode plate) includes a strip-shaped positive electrode current collector (first current collector) and a positive electrode mixture layer (first mixture layer) disposed on both sides of the positive electrode current collector.
  • the positive electrode mixture layer may contain activated carbon as a positive electrode material (active material).
  • the positive electrode material may include carbon materials other than activated carbon.
  • carbon materials include carbon nanotubes, graphite, graphene, and the like.
  • Raw materials for activated carbon include, for example, wood, coconut shells, pulp waste, coal or coal-based pitch obtained by thermal decomposition thereof, heavy oil or petroleum-based pitch obtained by thermal decomposition thereof, phenolic resin, petroleum coke, coal coke. etc.
  • the activated carbon is preferably activated carbon.
  • the positive electrode mixture layer may contain components other than the positive electrode material (active material).
  • other components include a binder, a conductive material, and the like.
  • the binder for example, resin materials such as polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), etc. are used.
  • the conductive material carbon black (for example, acetylene black, etc.) is used.
  • a strip-shaped metal foil (for example, aluminum foil) can be used as the positive electrode current collector.
  • the thickness of the current collector is not particularly limited, and may be in the range of 10 ⁇ m to 100 ⁇ m (for example, in the range of 15 ⁇ m to 40 ⁇ m).
  • the surface of the positive electrode current collector may be roughened by a method such as etching (the same applies to the negative electrode current collector).
  • the negative electrode (negative electrode plate) includes a strip-shaped negative electrode current collector (second current collector) and a negative electrode mixture layer (second mixture layer) disposed on both sides of the negative electrode current collector.
  • the negative electrode mixture layer contains a negative electrode material (active material).
  • the negative electrode material includes a negative electrode material (active material) capable of adsorbing and desorbing ions. Examples of negative electrode materials include carbon materials, and the carbon materials exemplified as positive electrode materials may also be used. Specifically, activated carbon, hard carbon, carbon nanotubes, graphite, graphene, etc. may be used as the negative electrode material.
  • the negative electrode mixture layer may contain components other than the negative electrode material (active material).
  • examples of other components include a binder and a conductive material.
  • the binder and the conductive material the substances exemplified as the binder and the conductive material of the positive electrode may be used.
  • a strip-shaped metal foil (for example, aluminum foil) can be used as the negative electrode current collector.
  • the thickness of the current collector is not particularly limited, and may be in the range of 10 ⁇ m to 100 ⁇ m (for example, in the range of 15 ⁇ m to 40 ⁇ m).
  • the method of forming the first and second electrodes is not limited, and may be formed by any known method.
  • the mixture layer may be formed by the following method. First, a slurry is prepared by mixing an electrode material (active material), a binder and/or a conductive material, and a dispersion medium. Next, the obtained slurry is applied to the surface of the current collector to form a coating film. Next, the coating film is dried and rolled to form a mixture layer on the surface of the current collector. In this way, a mixture layer is formed.
  • the separator is arranged between the first electrode and the second electrode (positive electrode and negative electrode) to prevent short circuit between the positive electrode and the negative electrode.
  • materials for the separator include insulating resin and glass.
  • examples of the separator include a nonwoven fabric mainly composed of cellulose, a glass fiber mat, and a microporous film of polyolefin such as polyethylene.
  • the separator may be a known separator used in electric double layer capacitors or lithium ion capacitors.
  • the separator includes a first separator in the form of a band and a second separator in the form of a band.
  • the band-shaped separator may be bent to stack two sheets, and the two stacked separators may be used as the first and second separators.
  • the average thickness of the separator is not particularly limited, and may be in the range of 10 ⁇ m to 100 ⁇ m (for example, in the range of 20 ⁇ m to 40 ⁇ m).
  • electrolyte electrolytic solution
  • electrolyte electrolytic solution
  • a non-aqueous solvent in which a solute (such as an organic salt or an inorganic salt) is dissolved can be used as the electrolyte.
  • the exterior body houses a wound body and an electrolyte (electrolyte solution).
  • electrolyte electrolyte solution
  • the exterior body may include a bottomed cylindrical case and a sealing body that seals the case.
  • Method for manufacturing electrochemical device An example of a method for manufacturing the electrochemical device (D3) will be described below. Note that the electrochemical device (D3) may be manufactured by a method other than the method described below.
  • the constituent members that make up the rolled body are prepared.
  • the first and second electrodes (or electrode sheets serving as those electrodes) can be formed by the method described above. If necessary, leads are connected to the electrodes (or electrode sheets) in advance.
  • a winding process is performed. In the winding step, a wound body is formed by winding the first electrode, the second electrode, and the separator such that the separator is disposed between the first electrode and the second electrode. .
  • a bending process is performed in which the vicinity of the portion that becomes the outer peripheral end of the second electrode is bent.
  • the method of the bending step and any method that can bend the vicinity of the outer peripheral edge of the second electrode may be used.
  • the second electrode when shearing the band-shaped electrode sheet that will become the second electrode into a predetermined length, the second electrode may be bent at the same time as shearing.
  • the bent portion may be formed by intentionally providing a certain gap between the lower die and the upper die and performing shearing.
  • the same method can be used.
  • the electrochemical device (D3) may be assembled by a known method.
  • an electrochemical device (D3) can be obtained by housing the wound body and electrolyte in an exterior body.
  • FIG. 1A and FIG. 1B show one step of the manufacturing method of Embodiment 1.
  • FIG. 1A is a cross-sectional view schematically showing a part of the process of producing a wound body.
  • FIG. 1B is a top view of FIG. 1A.
  • Embodiment 1 In the manufacturing method of Embodiment 1, first, as shown in FIG. 1A, a part of the negative electrode 3 on the one end 3e side and a part of the one end 4e side of the separator 4 are wound around the winding shaft 110 (the first winding shaft 111 and the first winding shaft 111). It is sandwiched between the two winding shafts 112).
  • the winding shaft 110 includes a first winding shaft 111 and a second winding shaft 112.
  • the first winding shaft 111 and the second winding shaft 112 are each rod-shaped bodies having a semicircular cross section.
  • the strip-shaped positive electrode 2 includes a strip-shaped cathode current collector and a cathode mixture layer disposed on both sides of the cathode current collector.
  • the strip-shaped negative electrode 3 includes a strip-shaped negative electrode current collector and negative electrode mixture layers disposed on both sides of the negative electrode current collector. Note that a lead (not shown) is connected to each of the positive electrode 2 and the negative electrode 3.
  • the strip-shaped separator 4 includes a strip-shaped first separator 4a and a strip-shaped second separator 4b.
  • the first winding shaft 111 and the second winding shaft 112 include a part on the one end 3e side of the negative electrode 3, a part on the one end 4ae side of the first separator 4a, and a part on the one end 4ae side of the first separator 4a.
  • a part of one end 4be side of the separator 4b is sandwiched therebetween.
  • FIG. 1A the first winding shaft 111 and the second winding shaft 112 include a part on the one end 3e side of the negative electrode 3, a part on the one end 4ae side of the first separator 4a, and a part on the one end 4ae side of the first separator 4a.
  • a part of one end 4be side of the separator 4b is sandwiched therebetween.
  • a part of the one end 3e side of the negative electrode 3 is arranged such that one end 3e of the negative electrode 3 and one end 4e of the separator 4 protrude from between the first winding shaft 111 and the second winding shaft 112. and a part of the one end 4e side of the separator 4 are sandwiched between the first winding shaft 111 and the second winding shaft 112.
  • the positive electrode 2 is not sandwiched between the first winding shaft 111 and the second winding shaft 112.
  • a wound body is formed by rotating the winding shaft 110 while keeping part of the negative electrode 3 and part of the separator 4 sandwiched between the winding shaft 110.
  • a wound body is formed by rotating the winding shaft 110 in the direction of the arrow in FIG. 1A.
  • the positive electrode 2 is also wound together with the negative electrode 3 and the separator 4, and a wound body including them is formed.
  • the end of the outermost separator 4 and/or the end of the outermost negative electrode 3 may be fixed with tape.
  • FIG. 2 is a cross-sectional view showing the state when the formed rolled body 1 is placed in the outer case 6.
  • illustration of a part of the wound body 1 is omitted.
  • the size ratio of each member is changed from the actual ratio in order to facilitate understanding.
  • the actual ratio of the thickness of each member constituting the wound body 1 to the size of the outer case 6 is smaller than the ratio shown in FIG. 2 . That is, in FIG. 2, each member constituting the wound body 1 is drawn thicker than the actual thickness.
  • the wound body 1 shown in FIG. 2 includes a winding shaft portion 1a formed between a winding shaft 110 (first and second winding shafts 111 and 112), and a winding portion 1b connected to the winding shaft portion 1a. including.
  • the winding portion 1b is a portion around which the constituent elements of the winding body 1 are wound.
  • the winding shaft portion 1a includes a part on the one end 3e side of the negative electrode 3 and a part on the one end 4e side of the separator 4.
  • the winding shaft portion 1a illustrated in the first embodiment does not include the positive electrode 2.
  • the winding shaft portion 1a normally extends radially across the central circular hollow portion in a cross section perpendicular to the central axis of the winding body 1 (the cross section shown in FIG. 2).
  • a negative electrode 3 exists inside the innermost periphery of the positive electrode 2 and outside the outermost periphery of the positive electrode 2. Therefore, in the wound body 1, both surfaces of the positive electrode 2 face the negative electrode 3.
  • the length L from the winding shaft 110 to one end of the positive electrode 2 is It should be larger than the circumference.
  • the separator 4 is present on the outermost periphery, and the electrode plate and the outer case 6 are not in contact with each other.
  • the wound body 1 exemplified in Embodiment 1 further includes a protrusion 1c continuous to the winding shaft portion 1a on the opposite side from the winding portion 1b.
  • the protrusion 1c includes one end 3e of the negative electrode 3.
  • the negative electrode 3 and the separator 4 are bent before and after the winding shaft portion 1a.
  • the outer peripheral end of the separator 4 and/or the outer peripheral end of the negative electrode 3 may be fixed with tape. By fixing the outer peripheral end with tape, the winding start and winding end of the wound body 1 can be fixed. As a result, loosening of the wound body 1 can be particularly suppressed.
  • FIG. 3 is a partially cutaway perspective view of the electrochemical device 10 according to the first embodiment.
  • Electrochemical device 10 shown in FIG. 3 is an electric double layer capacitor.
  • Electrochemical device 10 includes a wound body (capacitor element) 1 .
  • a lead wire 5a is connected to the positive electrode 2, and a lead wire 5b is connected to the negative electrode 3.
  • the wound body 1 is housed in a cylindrical outer case 6 together with an electrolyte (not shown).
  • metals such as aluminum, stainless steel, copper, iron, and brass can be used, for example.
  • the opening of the exterior case 6 is sealed with a sealing member 7.
  • the lead wires 5a and 5b are led out to the outside so as to penetrate the sealing member 7.
  • the sealing member 7 can be made of an elastic member such as rubber (for example, butyl rubber).
  • Embodiment 2 In Embodiment 2, an example of a manufacturing method (M2) and an electrochemical device (D2) will be described. According to the manufacturing method and electrochemical device of Embodiment 2, the above-mentioned effects can be obtained.
  • 4A and 4B show one step of the manufacturing method of the second embodiment.
  • FIG. 4A is a cross-sectional view schematically showing a part of the process of manufacturing the wound body.
  • FIG. 4B is a top view of FIG. 4A.
  • the winding shaft 110 includes a first winding shaft 111 and a second winding shaft 112.
  • the first winding shaft 111 and the second winding shaft 112 are each rod-shaped bodies, and each has a semicircular cross section with a diameter of length A.
  • the strip-shaped positive electrode 2 includes a strip-shaped cathode current collector and a cathode mixture layer disposed on both sides of the cathode current collector.
  • the strip-shaped negative electrode 3 includes a strip-shaped negative electrode current collector and negative electrode mixture layers disposed on both sides of the negative electrode current collector. Note that a lead (not shown) is connected to each of the positive electrode 2 and the negative electrode 3.
  • the strip-shaped separator 4 includes a strip-shaped first separator 4a and a strip-shaped second separator 4b.
  • the first winding shaft 111 and the second winding shaft 112 are a part of the first separator 4a on the one end 4ae side and a part of the second separator 4b on the one end 4be side. In between.
  • one end 4e of the separator 4 is arranged so that the one end 4e of the separator 4 protrudes from between the first winding shaft 111 and the second winding shaft 112 by a length D (mm). portion is sandwiched between the first winding shaft 111 and the second winding shaft 112.
  • the positive electrode 2 and the negative electrode 3 are not sandwiched between the first winding shaft 111 and the second winding shaft 112.
  • the negative electrode 3 is arranged between the first separator 4a and the second separator 4b.
  • the distance between one end 3e of the negative electrode 3 on the side of the winding shaft 110 and the winding shaft 110 is defined as a distance B (mm). Further, the distance between one end 2e of the positive electrode 2 on the winding shaft 110 side and one end 3e of the negative electrode 3 is defined as a distance C (mm).
  • the above description applies to the relationship between length A, distance B, distance C, length D, average thickness T1, and average thickness T2. Note that length A, distance B, distance C, and length D are the lengths and distances in the state of FIG. 4A.
  • the winding may be laid out flat and measured. Alternatively, the lengths and distances may be measured along the circumferential direction of the wound body from an image of the end face or cross section of the wound body.
  • a rolled body is formed by rotating the winding shaft 110 while keeping a part of the separator 4 sandwiched between the winding shafts 110.
  • a wound body is formed by rotating the winding shaft 110 in the direction of the arrow in FIG. 4A.
  • the positive electrode 2 is also wound together with the negative electrode 3 and the separator 4, and a wound body including them is formed.
  • FIG. 5 is a sectional view showing the state when the formed wound body 1 is placed in the outer case 6.
  • illustration of a part of the wound body 1 is omitted.
  • the size ratio of each member is changed from the actual ratio in order to facilitate understanding.
  • the actual ratio of the thickness of each member constituting the wound body 1 to the size of the outer case 6 is smaller than the ratio shown in FIG. That is, in FIG. 5, each member constituting the wound body 1 is drawn thicker than the actual thickness.
  • the wound body 1 shown in FIG. 5 includes a winding shaft portion 1a formed between a winding shaft 110 (first and second winding shafts 111 and 112), and a winding portion 1b connected to the winding shaft portion 1a. including.
  • the winding portion 1b is a portion around which the constituent elements of the winding body 1 are wound.
  • the winding shaft portion 1a is composed only of separators 4 (first and second separators 4a and 4b).
  • the winding shaft portion 1a includes a first end portion 1as that is a boundary with the winding portion 1b, and a second end portion 1at opposite to the first end portion 1as.
  • the wound body 1 includes a protrusion 1c that is constituted only by the first and second separators 4a and 4b and protrudes from the second end 1at. Since the protruding portion 1c is present, the separator 4 is bent before and after the winding shaft portion 1a.
  • the winding part 1b is a reinforcing part in which only the first and second separators 4a and 4b are wound one or more times between the first end 1as and one end 3e of the negative electrode 3 on the winding shaft side. Includes 1bx. In the example shown in FIG. 5, the number of turns n is 1. Note that in the reinforcing portion 1bx, only the first and second separators 4a and 4b may be wound one or more times. The reinforcing portion in which only the first and second separators 4a and 4b are wound may have three or fewer turns, or two or fewer turns.
  • winding shaft portion 1a normally extends radially across the central circular hollow portion in a cross section perpendicular to the central axis of the winding body 1 (the cross section shown in FIG. 5).
  • a negative electrode 3 exists inside the innermost periphery of the positive electrode 2 and outside the outermost periphery of the positive electrode 2. Therefore, in the wound body 1, both surfaces of the positive electrode 2 face the negative electrode 3.
  • the above condition (b) may be satisfied.
  • the separator 4 is present on the outermost periphery, and the electrode plate and the outer case 6 are not in contact with each other.
  • FIG. 6 is a partially cutaway perspective view of the electrochemical device 20 according to the second embodiment.
  • the electrochemical device 20 shown in FIG. 6 is an electric double layer capacitor.
  • Electrochemical device 20 includes a wound body (capacitor element) 1 .
  • a lead wire 5a is connected to the positive electrode 2, and a lead wire 5b is connected to the negative electrode 3.
  • the wound body 1 is housed in a cylindrical outer case 6 together with an electrolyte (not shown).
  • metals such as aluminum, stainless steel, copper, iron, and brass can be used, for example.
  • the opening of the exterior case 6 is sealed with a sealing member 7.
  • the lead wires 5a and 5b are led out to the outside so as to penetrate the sealing member 7.
  • the sealing member 7 can be made of an elastic member such as rubber (for example, butyl rubber).
  • Embodiment 3 In Embodiment 3, an example of an electrochemical device (D3) and a method for manufacturing the same will be described. According to the electrochemical device of Embodiment 3, the above-mentioned effects can be obtained.
  • FIG. 7 shows a partial cross-sectional view of an example of the wound body of the electrochemical device (D3) of Embodiment 3.
  • FIG. 7 shows a state in which the rolled body 1 is housed in the outer case 6.
  • FIG. 7 only a part of the outer peripheral part of the wound body 1 is shown.
  • the wound body 1 shown in FIG. 7 is formed by winding a strip-shaped first electrode 2, a strip-shaped second electrode 3, and a separator 4.
  • a separator 4 is arranged between the first electrode 2 and the second electrode 3.
  • Separator 4 includes a first separator 4a and a second separator 4b.
  • the outermost periphery of the second electrode 3 is arranged outside the outermost periphery of the first electrode 2. Furthermore, a separator 4 is present outside the outermost periphery of the second electrode 3 . Therefore, the second electrode 3 and the exterior case 6 are not in contact with each other.
  • the outer peripheral end 3e faces the inner second electrode 3 with the stacked first separator 4a and second separator 4b interposed therebetween. According to this configuration, even if the outer peripheral end 3e damages the separator, it is possible to prevent the first electrode 2 and the second electrode 3 from being short-circuited.
  • the vicinity of the outer peripheral end 3e may be held between a jig or the like and bent. Thereby, as shown in FIG. 8, it is possible to form a bent portion 3c near the outer peripheral end 3e of the second electrode 3.
  • the bent portion 3c extends linearly along a direction perpendicular to the longitudinal direction of the second electrode 3 (a direction parallel to the outer peripheral end 3e).
  • the distance L from the outer peripheral end 3e to the bent portion 3c may be in the range of 0.01 to 0.5 mm, as described above.
  • the angle ⁇ at which the second electrode 3 is bent at the bent portion 3c can be within the range described above.
  • a lead may be connected in advance to each of the first electrode 2 and the second electrode 3 that are wound. Further, the outermost separator 4 of the wound body may be fixed with tape.
  • FIG. 9 is a partially cutaway perspective view of the electrochemical device 30 according to the third embodiment.
  • Electrochemical device 30 shown in FIG. 9 is an electric double layer capacitor.
  • Electrochemical device 30 includes a wound body (capacitor element) 1 .
  • a lead wire 5a is connected to the first electrode 2, and a lead wire 5b is connected to the second electrode 3.
  • the wound body 1 is housed in a cylindrical exterior case 6 together with an electrolytic solution (not shown).
  • an electrolytic solution not shown.
  • metals such as aluminum, stainless steel, copper, iron, and brass can be used, for example.
  • the opening of the exterior case 6 is sealed with a sealing member 7.
  • the lead wires 5a and 5b are led out to the outside so as to penetrate the sealing member 7.
  • the sealing member 7 can be made of an elastic member such as rubber (for example, butyl rubber). As described above, the vicinity of the outer peripheral end of the second electrode 3 is bent.
  • Winding body 1a Winding shaft portion 1b: Winding portion 1bx: Reinforcement portion 1c: Projecting portion 2: Positive electrode, first electrode 3: Negative electrode, second electrode 3c: Bent portion 3e: Outer peripheral end 4: Separator 4a: First separator 4b: Second separator 10: Electrochemical device (first electrochemical device) 20: Electrochemical device (second electrochemical device) 30: Electrochemical device (third electrochemical device) 110: Winding shaft 111: First winding shaft 112: Second winding shaft

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  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
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  • Secondary Cells (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
PCT/JP2023/010877 2022-03-24 2023-03-20 電気化学デバイスおよび電気化学デバイスの製造方法 Ceased WO2023182269A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0115167Y2 (https=) * 1983-01-06 1989-05-08
JPH08264394A (ja) * 1995-03-27 1996-10-11 Nichicon Corp アルミニウム電解コンデンサ
JP2015122276A (ja) * 2013-12-25 2015-07-02 三洋電機株式会社 円筒形電池
JP2017010878A (ja) * 2015-06-25 2017-01-12 トヨタ自動車株式会社 非水電解液二次電池
JP2017188541A (ja) * 2016-04-05 2017-10-12 日本ケミコン株式会社 コンデンサの製造方法およびコンデンサ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0115167Y2 (https=) * 1983-01-06 1989-05-08
JPH08264394A (ja) * 1995-03-27 1996-10-11 Nichicon Corp アルミニウム電解コンデンサ
JP2015122276A (ja) * 2013-12-25 2015-07-02 三洋電機株式会社 円筒形電池
JP2017010878A (ja) * 2015-06-25 2017-01-12 トヨタ自動車株式会社 非水電解液二次電池
JP2017188541A (ja) * 2016-04-05 2017-10-12 日本ケミコン株式会社 コンデンサの製造方法およびコンデンサ

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