WO2023145674A1 - 円筒形の非水電解質二次電池 - Google Patents

円筒形の非水電解質二次電池 Download PDF

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Publication number
WO2023145674A1
WO2023145674A1 PCT/JP2023/001865 JP2023001865W WO2023145674A1 WO 2023145674 A1 WO2023145674 A1 WO 2023145674A1 JP 2023001865 W JP2023001865 W JP 2023001865W WO 2023145674 A1 WO2023145674 A1 WO 2023145674A1
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Prior art keywords
negative electrode
mixture layer
winding
aqueous electrolyte
core
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Ceased
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PCT/JP2023/001865
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English (en)
French (fr)
Japanese (ja)
Inventor
駿介 安田
篤 見澤
文一 水越
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Panasonic Energy Co Ltd
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Panasonic Energy Co Ltd
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Application filed by Panasonic Energy Co Ltd filed Critical Panasonic Energy Co Ltd
Priority to EP23746886.3A priority Critical patent/EP4471927A4/en
Priority to CN202380017380.7A priority patent/CN118575327A/zh
Priority to JP2023576891A priority patent/JPWO2023145674A1/ja
Publication of WO2023145674A1 publication Critical patent/WO2023145674A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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 a cylindrical non-aqueous electrolyte secondary battery.
  • Patent Document 1 there is one described in Patent Document 1 as a cylindrical non-aqueous electrolyte secondary battery.
  • the negative electrode provided with the negative electrode mixture layer has a non-facing portion that does not face the positive electrode on the winding inner side of the electrode body, and the non-facing portion exists two or more turns.
  • deformation of the electrode body on the inner side of the winding is suppressed by providing the non-facing portion on the inner side of the winding.
  • an object of the present disclosure is to provide a cylindrical non-aqueous electrolyte secondary battery that can suppress deformation of the positive and negative electrode facing portions.
  • a cylindrical non-aqueous electrolyte secondary battery includes a wound electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a non-aqueous electrolyte, and an electrode body.
  • An outer can containing a non-aqueous electrolyte is provided, and the negative electrode is wound 1.25 turns or more in a state where it does not face the positive electrode from the part facing the winding inner side of the positive electrode starting end in the winding direction to the winding start side.
  • a first negative electrode mixture layer forming portion including a non-facing portion, wherein the non-facing portion is provided with a negative electrode mixture layer on at least one surface of the negative electrode core in order from the facing portion side toward the winding start side; a first negative electrode core exposing portion where the negative electrode core is exposed; and a second negative electrode mixture layer forming portion where a negative electrode mixture layer is provided on at least one surface of the negative electrode core;
  • the layer forming part is wound one or more rounds.
  • cylindrical non-aqueous electrolyte secondary battery According to the cylindrical non-aqueous electrolyte secondary battery according to the present disclosure, deformation of the positive and negative electrode opposing portions can be suppressed.
  • FIG. 1 is an axial cross-sectional view of a cylindrical non-aqueous electrolyte secondary battery according to an embodiment of the present disclosure
  • FIG. 3 is a perspective view of an electrode body of the non-aqueous electrolyte secondary battery
  • FIG. 4 is a plan view showing a winding structure on the inner side of the winding in the electrode body
  • FIG. 4 is a schematic plan view showing one side surface of a negative electrode that is developed in an elongated shape.
  • 5 is a schematic plan view corresponding to FIG. 4 of the negative electrode of the non-aqueous electrolyte secondary battery of Comparative Example.
  • FIG. FIG. 4 is a plan view corresponding to FIG. 3 of a negative electrode of a non-aqueous electrolyte secondary battery of a comparative example;
  • the axial direction (height direction) of the cylindrical non-aqueous electrolyte secondary battery 10 on the side of the sealing member 17 is defined as "up”
  • the axial direction on the side of the bottom portion 68 of the outer can 16 is defined as "down”.
  • FIG. 1 is an axial cross-sectional view of a cylindrical non-aqueous electrolyte secondary battery 10 according to an embodiment of the present disclosure
  • FIG. 2 is a perspective view of an electrode body 14 of the non-aqueous electrolyte secondary battery 10.
  • a non-aqueous electrolyte secondary battery (hereinafter simply referred to as a battery) 10 contains a wound electrode body 14, a non-aqueous electrolyte (not shown), the electrode body 14 and the non-aqueous electrolyte. It has a bottomed cylindrical outer can 16 made of metal and a sealing member 17 for closing the opening of the outer can 16 .
  • the electrode assembly 14 has a wound structure in which a long positive electrode 11 and a long negative electrode 12 are wound with two long separators 13 interposed therebetween.
  • the negative electrode 12 is formed with a size one size larger than that of the positive electrode 11 in order to prevent deposition of lithium. That is, the negative electrode 12 is formed longer than the positive electrode 11 in the longitudinal direction and the width direction (transverse direction). Also, the two separators 13 are at least one size larger than the positive electrode 11, and are arranged so as to sandwich the positive electrode 11, for example.
  • the negative electrode 12 may constitute the winding start end of the electrode body 14 . Generally, however, the separator 13 extends beyond the winding start end of the negative electrode 12 , and the winding start end of the separator 13 becomes the winding start end of the electrode body 14 .
  • the non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the non-aqueous solvent include esters, ethers, nitriles, amides, and mixed solvents of two or more thereof.
  • the non-aqueous solvent may contain a halogen-substituted product obtained by substituting at least part of the hydrogen atoms of these solvents with halogen atoms such as fluorine.
  • the non-aqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • a lithium salt such as LiPF 6 is used as the electrolyte salt.
  • the positive electrode 11 has a positive electrode core 41 (see FIG. 3) and positive electrode mixture layers 42 (see FIG. 3) formed on both sides of the positive electrode core 41 .
  • a metal foil stable in the potential range of the positive electrode 11, such as aluminum or an aluminum alloy, or a film having the metal on the surface thereof can be used.
  • the positive electrode mixture layer 42 contains a positive electrode active material, a conductive agent, and a binder.
  • a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, a binder, and the like is applied onto the positive electrode core 41, dried, and then compressed to form a positive electrode mixture layer 42. It can be produced by forming on both sides of the positive electrode core 41 .
  • the positive electrode active material is composed mainly of a lithium-containing metal composite oxide.
  • Metal elements contained in the lithium-containing metal composite oxide include Ni, Co, Mn, Al, B, Mg, Ti, V, Cr, Fe, Cu, Zn, Ga, Sr, Zr, Nb, In, Sn , Ta, W, and the like.
  • An example of a preferable lithium-containing metal composite oxide is a composite oxide containing at least one of Ni, Co, Mn and Al.
  • Examples of the conductive agent contained in the positive electrode mixture layer 42 include carbon materials such as carbon black, acetylene black, ketjen black, and graphite.
  • Examples of the binder contained in the positive electrode mixture layer 42 include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide resins, acrylic resins, and polyolefin resins. can. These resins may be used in combination with cellulose derivatives such as carboxymethyl cellulose (CMC) or salts thereof, polyethylene oxide (PEO), and the like.
  • the negative electrode 12 has a negative electrode core 51 and negative electrode mixture layers 52 formed on both sides of the negative electrode core 51 .
  • a metal foil stable in the potential range of the negative electrode 12 such as copper or a copper alloy, or a film having the metal on the surface thereof can be used.
  • the negative electrode mixture layer 52 contains a negative electrode active material and a binder.
  • a negative electrode mixture slurry containing a negative electrode active material, a binder, and the like is applied onto the negative electrode core 51, the coating film is dried, and then compressed to form the negative electrode mixture layer 52 on the negative electrode core. It can be produced by forming on both sides of 51 .
  • a carbon material that reversibly absorbs and releases lithium ions is generally used as the negative electrode active material.
  • Preferred carbon materials are graphite such as natural graphite such as flake graphite, massive graphite and earthy graphite, massive artificial graphite and artificial graphite such as graphitized mesophase carbon microbeads.
  • the negative electrode mixture layer 52 may contain a Si material containing silicon (Si) as a negative electrode active material. In this case, the negative electrode mixture layer 52 may also contain silicon oxide represented by SiO x (0.5 ⁇ x ⁇ 1.6).
  • a metal other than Si that forms an alloy with lithium, an alloy containing the metal, a compound containing the metal, or the like may be used as the negative electrode active material.
  • the binder contained in the negative electrode mixture layer 52 may be fluorine resin, PAN, polyimide resin, acrylic resin, polyolefin resin, or the like, but preferably styrene-butadiene rubber ( SBR) or its modified form is used.
  • the negative electrode mixture layer 52 may contain, for example, CMC or its salt, polyacrylic acid (PAA) or its salt, polyvinyl alcohol, etc. in addition to SBR or the like.
  • a porous sheet having ion permeability and insulation is used for the separator 13 .
  • porous sheets include microporous thin films, woven fabrics, and non-woven fabrics.
  • polyolefin resins such as polyethylene and polypropylene, cellulose, and the like are preferable.
  • the separator 13 may have either a single layer structure or a laminated structure.
  • a heat-resistant layer or the like may be formed on the surface of the separator 13 .
  • the positive electrode lead 20 is joined to the positive electrode 11, and the negative electrode lead 21 is joined to the winding start side of the negative electrode 12 in the longitudinal direction.
  • Battery 10 has insulating plate 18 above electrode assembly 14 and insulating plate 19 below electrode assembly 14 .
  • the positive electrode lead 20 passes through the through-hole of the insulating plate 18 and extends toward the sealing member 17
  • the negative electrode lead 21 passes through the through-hole of the insulating plate 19 and extends toward the bottom 68 of the outer can 16 .
  • the positive electrode lead 20 is connected to the lower surface of the sealing plate 23 of the sealing body 17 by welding or the like.
  • a terminal cap 27 forming a top plate of the sealing body 17 is electrically connected to the sealing plate 23, and the terminal cap 27 serves as a positive electrode terminal.
  • the negative electrode lead 21 is connected to the inner surface of the bottom portion 68 of the metal outer can 16 by welding or the like, and the outer can 16 serves as a negative electrode terminal.
  • the positive electrode lead 20 is electrically connected to an intermediate portion such as the central portion in the winding direction of the positive electrode core.
  • the negative electrode lead 21 is electrically connected to the winding start side end of the negative electrode core 51 in the winding direction, and the winding end side end of the negative electrode core 51 is brought into contact with the inner surface of the outer can 16 . are in contact.
  • one negative electrode lead is electrically connected to the winding end side end of the negative electrode core in the winding direction without contacting the winding end side end of the negative electrode core with the inner surface of the outer can.
  • the electrode body has two negative leads, one negative lead is electrically connected to the winding start side end of the negative electrode core in the winding direction, and the other negative lead is connected to the negative electrode core. It may be electrically connected to the end portion on the winding end side in the winding direction.
  • the negative electrode and the outer can may be electrically connected by bringing the winding end portion of the negative electrode core in the winding direction into contact with the inner surface of the outer can without using the negative electrode lead.
  • the battery 10 further includes a resin gasket 28 arranged between the outer can 16 and the sealing member 17 .
  • the sealing member 17 is crimped and fixed to the opening of the outer can 16 via a gasket 28 . Thereby, the internal space of the battery 10 is sealed.
  • the gasket 28 is sandwiched between the outer can 16 and the sealing member 17 to insulate the sealing member 17 from the outer can 16 .
  • the gasket 28 has the role of a sealing material for keeping the inside of the battery airtight and the role of an insulating material for insulating the outer can 16 and the sealing body 17 .
  • the outer can 16 accommodates the electrode body 14 and the non-aqueous electrolyte, and has a shoulder portion 38 , a grooved portion 34 , a cylindrical portion 30 and a bottom portion 68 .
  • the grooved portion 34 can be formed, for example, by spinning a portion of the side surface of the outer can 16 radially inward to form an annular depression radially inward.
  • the shoulder portion 38 is formed by bending the upper end portion of the outer can 16 inward toward the peripheral edge portion 45 of the outer can 17 when the sealing member 17 is crimped and fixed to the outer can 16 .
  • the sealing body 17 has a structure in which a sealing plate 23, a lower valve body 24, an insulating member 25, an upper valve body 26, and a terminal cap 27 are layered in order from the electrode body 14 side.
  • Each member constituting the sealing member 17 has, for example, a disk shape or a ring shape, and each member except for the insulating member 25 is electrically connected to each other.
  • the sealing plate 23 has at least one through hole 23a.
  • the lower valve body 24 and the upper valve body 26 are connected at their central portions, and an insulating member 25 is interposed between their peripheral edge portions.
  • the lower valve body 24 deforms and breaks so as to push the upper valve body 26 upward toward the terminal cap 27, thereby breaking the lower valve body 24 and the upper valve body 26.
  • the current path between is interrupted.
  • the upper valve body 26 is broken, and the gas is discharged from the through hole 27a of the terminal cap 27. As shown in FIG. By discharging the gas, it is possible to prevent the battery 10 from exploding due to an excessive rise in the internal pressure of the battery 10 , thereby enhancing the safety of the battery 10 .
  • FIG. 3 is a plan view showing the winding structure on the winding inner side of the electrode body 14.
  • the negative electrode 12 is wound 1.25 times or more in a state in which it does not face the positive electrode 11 from the portion facing the winding inner side of the starting end portion 11a of the positive electrode 11 in the winding direction to the winding start side.
  • a facing portion 60 is included.
  • the non-facing portion 60 is wound one or more rounds from the portion facing the winding inner side of the starting end portion 11a toward the winding start side, and the negative electrode core 51 is continuously wound on both surfaces of the negative electrode core 51 along the winding direction. It has a first negative electrode mixture layer forming portion 61 provided with the mixture layer 52 .
  • the non-opposing portion 60 further includes a first negative electrode core exposed portion 62 wound from the first negative electrode mixture layer forming portion 61 toward the winding start side and the negative electrode core 51 exposed, and a first negative electrode core exposed portion 62 .
  • a second negative electrode mixture layer forming portion 63 is wound from the portion 62 toward the winding start side, and the negative electrode mixture layer 52 is continuously provided on both surfaces of the negative electrode core 51 . That is, the non-facing portion 60 includes a first negative electrode mixture layer forming portion 61 and a first negative electrode substrate exposed portion 62 in order from the portion facing the winding inner side of the positive electrode 11 toward the winding start side. , and a second negative electrode mixture layer forming portion 63 .
  • the length of the first negative electrode core exposed portion 62 is not particularly limited, in the present embodiment, the first negative electrode core exposed portion 62 is wound with a length of 0.2 turns.
  • the first negative electrode core exposed portion 62 is preferably wound in the winding direction with a length of 0.1 round or more and 0.3 round or less.
  • the non-opposed portion 60 further has a second negative electrode core exposed portion 64 wound from the second negative electrode mixture layer forming portion 63 toward the winding start side and in which the negative electrode core 51 is exposed.
  • the negative electrode lead 21 is joined to the outer peripheral side of the second negative electrode substrate exposed portion 64 .
  • FIG. 4 is a schematic plan view showing one side surface of the negative electrode 12 developed in an elongated shape.
  • the non-facing portion 60 includes a first negative electrode mixture layer forming portion 61, a first negative electrode substrate exposed portion 62, a second negative electrode mixture layer forming portion 63, and a second negative electrode substrate exposed portion. 64.
  • the first and second negative electrode mixture layer forming portions 61 and 63 have the negative electrode mixture layers 52 on both surfaces of the negative electrode core 51
  • the first and second negative electrode mixture layer forming portions may be provided only on one surface of the negative electrode core 51 .
  • the battery 10 has a negative electrode mixture layer in which the negative electrode mixture layer 52 is formed on at least one surface of the negative electrode core 51 in the non-facing portion 60 that does not face the positive electrode 11 on the inner side of the winding of the negative electrode 12. It has forming portions 61 and 63 . Therefore, the rigidity of the winding inner side of the electrode body 14, which is likely to be deformed when the electrode body 14 is repeatedly charged and discharged, can be increased.
  • the non-opposing portion 60 has a first negative electrode substrate exposed portion 62 positioned so as to be sandwiched between the first and second negative electrode mixture layer forming portions 61 and 63 . Since the first negative electrode core exposed portion 62 has lower rigidity than the first and second negative electrode mixture layer forming portions 61 and 63, when the winding inner side of the electrode body 14 receives stress, the first negative electrode core exposed portion It acts to relieve the stress of 62. Since the first negative electrode substrate exposed portion 62 is arranged so as to be separated from the positive electrode substrate facing portion 67 by one turn or more toward the winding start side, even if the first negative electrode substrate exposed portion 62 is deformed, the positive electrode substrate facing portion 67 does not move. Deformation is suppressed.
  • the first negative electrode core exposed portion 62 is preferably wound 0.1 round or more and 0.3 round or less. According to this configuration, while the rigidity of the non-facing portion 60 is secured, the stress on the inner side of the winding of the electrode body 14 is relieved, and the deformation of the positive and negative electrode facing portions 67 on the inner side of the winding of the electrode body 14 is effectively suppressed. . Further, when the negative electrode mixture layer 52 contains silicon oxide represented by SiO x (0.5 ⁇ x ⁇ 1.6), and the negative electrode 12 expands and contracts significantly during charging and discharging, the The effect of technology can be made remarkable.
  • Example> Aluminum-containing lithium nickel cobalt oxide (LiNi 0.88 Co 0.09 Al 0.03 O 2 ) was used as the positive electrode active material.
  • NMP N-methylpyrrolidone
  • a core exposing portion for attaching the positive electrode lead 20 was provided.
  • heat treatment was performed in a heated dryer to remove NMP, and then rolling was performed using a roll press. Further, the positive electrode plate after rolling was brought into contact with a heated roll for heat treatment, and cut into a thickness of 0.179 mm, a width of 62.6 mm, and a length of 703 mm to prepare the positive electrode 11 .
  • a positive electrode lead 20 made of aluminum and having a width of 3.5 mm was attached to the core exposed portion of the positive electrode 11 .
  • a negative electrode active material 95 parts by mass of graphite powder and 5 parts by mass of Si oxide were mixed. 100 parts by mass of the negative electrode active material, 1 part by mass of CMC as a thickener, and 1 part by mass of styrene-butadiene rubber as a binder were mixed in water to obtain a negative electrode slurry.
  • This negative electrode slurry was applied to both surfaces of a negative electrode core 51 made of copper foil having a thickness of 8 ⁇ m to form a negative electrode mixture layer 52 as shown in FIG.
  • the non-facing portion 67 was provided in a range of 1.75 turns from the portion facing the winding inner side of the starting end portion 11 a of the positive electrode 11 .
  • the first negative electrode mixture layer forming portion 61 and the first negative electrode substrate exposing portion 62 were provided in ranges of 1.25 turns and 0.2 turns, respectively.
  • the negative electrode mixture layer 52 was dried, it was compressed with a compression roller so that the thickness of the negative electrode became 0.192 mm, and cut into a width of 64 mm and a length of 816 mm to prepare the negative electrode 12 .
  • a negative electrode lead 21 made of nickel-copper was attached to the second negative electrode substrate exposed portion 64 of the negative electrode 12 .
  • a non-aqueous electrolytic solution was prepared by dissolving 5 mol/liter.
  • the positive electrode 11 and the negative electrode 12 are wound with a separator 13 made of polyethylene interposed therebetween, and a tape having a width of 9 mm and a length of 60.0 mm is attached to the outermost periphery of the electrode body 14 including the winding end of the negative electrode 12.
  • a separator 13 made of polyethylene interposed therebetween
  • a tape having a width of 9 mm and a length of 60.0 mm is attached to the outermost periphery of the electrode body 14 including the winding end of the negative electrode 12.
  • the non-opposed portion 60 of the negative electrode 12 has a first negative electrode substrate exposed portion 62 between first and second negative electrode mixture layer forming portions 61 and 63 .
  • the core exposed portion of the negative electrode 12 was arranged on the outermost peripheral surface of the electrode body 14 .
  • Insulating plates 18 and 19 are arranged above and below the electrode body 14, and the negative electrode lead 21 is welded to the outer can 16, and the positive electrode lead 20 is welded to the sealing plate 23 having an internal pressure-activated safety valve, and the outer can 16 is stored inside the After that, a non-aqueous electrolyte was injected into the outer can 16 by a depressurization method. Finally, a cylindrical battery (non-aqueous electrolyte secondary battery) 10 was manufactured by crimping and fixing the sealing member 17 to the open end of the outer can 16 via a gasket 28 . The capacity of the battery 10 was 4600mAh.
  • a negative electrode 112 was fabricated that differed from the example in that the negative electrode substrate exposed portion 62 (see FIG. 4) for the purpose of stress relaxation was not provided.
  • This negative electrode 112 has a negative electrode core 151 and negative electrode mixture layers 152 provided on both sides of the negative electrode core 151, and the negative electrode core 151 is exposed at the winding outer end and the winding inner end. It has a core exposed part.
  • the negative electrode 112 of the comparative example has a longitudinal length shorter than that of the negative electrode 12 of the example by the longitudinal length of the negative electrode core exposed portion 62 .
  • the mixture layer forming region of the negative electrode 112 of the comparative example is the same as the mixture layer forming region of the negative electrode 12 of the example.
  • Cylindrical non-aqueous electrolyte secondary battery 110 of Comparative Example has the same configuration as battery 10 of Example except for negative electrode 112 . As shown in FIG. 6 , in the battery 110 of the comparative example, the negative electrode substrate exposed portion sandwiched between the two negative electrode mixture layer forming portions is not present in the non-facing portion 160 of the negative electrode 112 .

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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PCT/JP2023/001865 2022-01-28 2023-01-23 円筒形の非水電解質二次電池 Ceased WO2023145674A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP23746886.3A EP4471927A4 (en) 2022-01-28 2023-01-23 CYLINDRICAL SECONDARY BATTERY WITH NON-AQUEOUS ELECTROLYTE
CN202380017380.7A CN118575327A (zh) 2022-01-28 2023-01-23 圆筒形的非水电解质二次电池
JP2023576891A JPWO2023145674A1 (https=) 2022-01-28 2023-01-23

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WO2024111413A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024111410A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024161960A1 (ja) * 2023-01-31 2024-08-08 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2025220349A1 (ja) * 2024-04-18 2025-10-23 パナソニックＩｐマネジメント株式会社 非水電解質二次電池

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JP2020102311A (ja) * 2018-12-20 2020-07-02 本田技研工業株式会社 捲回型電池および捲回型電池の製造方法

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KR101650417B1 (ko) * 2013-10-31 2016-08-23 주식회사 엘지화학 양극 집전체에 간헐적 무지부가 형성된 젤리 롤 형태 전극 조립체를 가진 이차전지

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JP2013137946A (ja) 2011-12-28 2013-07-11 Panasonic Corp 非水電解液二次電池
WO2018061381A1 (ja) * 2016-09-30 2018-04-05 パナソニックＩｐマネジメント株式会社 非水電解質二次電池
JP2020102311A (ja) * 2018-12-20 2020-07-02 本田技研工業株式会社 捲回型電池および捲回型電池の製造方法

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Publication number Priority date Publication date Assignee Title
WO2024111413A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024111410A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024161960A1 (ja) * 2023-01-31 2024-08-08 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2025220349A1 (ja) * 2024-04-18 2025-10-23 パナソニックＩｐマネジメント株式会社 非水電解質二次電池

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