WO2023182087A1 - 非水電解質二次電池 - Google Patents

非水電解質二次電池 Download PDF

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Publication number
WO2023182087A1
WO2023182087A1 PCT/JP2023/009994 JP2023009994W WO2023182087A1 WO 2023182087 A1 WO2023182087 A1 WO 2023182087A1 JP 2023009994 W JP2023009994 W JP 2023009994W WO 2023182087 A1 WO2023182087 A1 WO 2023182087A1
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Prior art keywords
negative electrode
electrode plate
region
plate
core
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Ceased
Application number
PCT/JP2023/009994
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English (en)
French (fr)
Japanese (ja)
Inventor
湧基 中井
哲 橋本
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Panasonic Energy Co Ltd
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Panasonic Energy Co Ltd
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Priority to CN202380027793.3A priority Critical patent/CN118872121A/zh
Priority to JP2024510055A priority patent/JPWO2023182087A1/ja
Priority to EP23774684.7A priority patent/EP4498470A4/en
Priority to US18/847,374 priority patent/US20250201801A1/en
Publication of WO2023182087A1 publication Critical patent/WO2023182087A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded 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
    • H01M10/05—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
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—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 non-aqueous electrolyte secondary battery.
  • cylindrical non-aqueous electrolyte secondary batteries such as lithium ion batteries have been known, which include an electrode body in which a positive electrode plate and a negative electrode plate are wound with a separator in between, and an outer can containing the electrode body and an electrolyte.
  • a current collector tab welded to a portion of the metal foil core of the negative electrode plate in the longitudinal direction of the electrode plate is connected to an exterior can that serves as a negative electrode terminal.
  • the current collecting tab connected to the negative electrode plate has been eliminated, and the exposed core portion formed along the longitudinal direction of the electrode plate at the end of the negative electrode plate in the electrode plate width direction is electrically connected to the outer can.
  • the structure is also known (see Patent Document 1). According to this structure, the maximum distance through which current can flow in the electrode plate can be changed from the conventional distance between the longitudinal end of the electrode plate and the current collecting tab to the height of the electrode plate, which is said to reduce resistance. There is.
  • Patent Document 1 it is necessary to apply the negative electrode mixture slurry to the negative electrode core so as to form a core exposed portion at the end of the negative electrode plate in the electrode plate width direction.
  • a secondary battery of a comparative example may be considered in which the surface of the negative electrode core body is made hydrophilic in a configuration similar to that disclosed in Patent Document 1. .
  • FIG. 5 is a diagram showing sag of the negative electrode mixture in a schematic enlarged cross-sectional view of an electrode body of a comparative example.
  • the adhesion between the negative electrode mixture layer 82 and the negative electrode core 81 may decrease, and the peel strength of the negative electrode mixture layer 82 with respect to the negative electrode core 81 may decrease.
  • the non-aqueous electrolyte secondary battery of the present disclosure has a configuration in which a core exposed portion is formed at the end of the negative electrode plate in the width direction of the electrode plate along the longitudinal direction of the electrode plate, suppressing sag of the negative electrode mixture, and The purpose is to increase the peel strength of the negative electrode mixture layer to the negative electrode core.
  • a non-aqueous electrolyte secondary battery includes a wound-type electrode body in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound with a separator interposed therebetween, and accommodates the electrode body and a non-aqueous electrolyte.
  • the negative electrode plate includes a negative electrode core and a negative electrode mixture layer formed on the surface of the negative electrode core, and one end of the negative electrode core in the plate width direction has a negative electrode core.
  • an exposed core portion is formed along the longitudinal direction of the electrode plate, the exposed core portion is electrically connected to the outer can, and the surface of the negative electrode core is formed in an area other than one end in the width direction of the electrode plate.
  • the nonaqueous electrolyte secondary battery in the configuration in which the core exposed portion is formed at the end of the negative electrode plate in the width direction of the electrode plate along the longitudinal direction of the electrode plate, dripping of the negative electrode mixture can be suppressed. , and the peel strength of the negative electrode mixture layer to the negative electrode core can be increased.
  • FIG. 1 is a cross-sectional view along the axial direction of a non-aqueous electrolyte secondary battery according to an example of an embodiment.
  • FIG. 2 is a perspective view illustrating the structure of a partially expanded electrode body that constitutes a non-aqueous electrolyte secondary battery according to an example of an embodiment.
  • FIG. 3 is a schematic development diagram illustrating a first region and a second region in which the arithmetic mean roughness of the surface of the negative electrode core body is different from each other in the embodiment.
  • FIG. 3 is a side view showing a method of applying a negative electrode mixture slurry to a negative electrode core of an experimental example from a coating machine in order to confirm the effects of the embodiment.
  • FIG. 6 is a schematic enlarged cross-sectional view of an electrode body of a comparative example, showing sagging of the negative electrode mixture.
  • FIG. 1 is a cross-sectional view along the axial direction of a non-aqueous electrolyte secondary battery 10 according to an embodiment.
  • FIG. 2 is a perspective view illustrating the structure of a part of the electrode assembly 14 constituting the non-aqueous electrolyte secondary battery 10.
  • the nonaqueous electrolyte secondary battery 10 includes a wound electrode body 14, a nonaqueous electrolyte (not shown), an outer can 15, and a sealing body 16.
  • the nonaqueous electrolyte secondary battery 10 may be simply referred to as the secondary battery 10.
  • the wound electrode body 14 has a strip-shaped positive electrode plate 11, a strip-shaped negative electrode plate 12, and a strip-shaped separator 13, and the positive electrode plate 11 and the negative electrode plate 12 are spirally wound with the separator 13 in between. has been done.
  • one axial side of the electrode body 14 may be referred to as "upper”, and the other axial side may be referred to as "lower”.
  • the non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the nonaqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • positive electrode plate 11 projects upwardly from negative electrode plate 12 and separator 13, and negative electrode plate 12 projects below from positive electrode plate 11 and separator 13.
  • an exposed positive electrode core part 11c in which the positive electrode mixture layer 11b is not provided, extends along the longitudinal direction ⁇ of the electrode plate at the upper end, which is one end of the positive electrode core 11a in the electrode plate width direction. It is formed over the entire length of the electrode plate.
  • the negative electrode core exposed portion 12c where the negative electrode mixture layer 12b is not provided in the negative electrode core body 12a is located in the electrode plate longitudinal direction. along the entire length of the plate. Therefore, the upper end of the electrode body 14 is configured with a positive electrode core exposed portion 11c, and the lower end of the electrode body 14 is configured with a negative electrode core exposed portion 12c.
  • the non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the non-aqueous solvent for example, esters, ethers, nitriles, amides, and mixed solvents of two or more of these may be used.
  • the non-aqueous solvent may contain a halogen-substituted product in which at least a portion of the hydrogen atoms of these solvents are replaced 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-like polymer or the like.
  • a lithium salt such as LiPF 6 is used as the electrolyte salt.
  • the positive electrode plate 11 has a positive electrode core 11a and a positive electrode mixture layer 11b formed on both sides of the positive electrode core 11a.
  • a metal foil such as aluminum or an aluminum alloy that is stable in the potential range of the positive electrode plate 11, a film in which the metal is disposed on the surface layer, or the like can be used.
  • the positive electrode mixture layer 11b contains a positive electrode active material, a conductive agent, and a binder.
  • the positive electrode plate 11 is prepared by applying a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, a binder, and a solvent such as N-methyl-2-pyrrolidone (NMP) to both sides of a positive electrode core 11a, and then drying and It is produced by rolling.
  • NMP N-methyl-2-pyrrolidone
  • positive electrode active materials include lithium-containing transition metal oxides containing transition metal elements such as Co, Mn, and Ni.
  • the lithium-containing transition metal oxide is not particularly limited, but has the general formula Li 1+x MO 2 (wherein -0.2 ⁇ x ⁇ 0.2, M includes at least one of Ni, Co, Mn, and Al).
  • a complex oxide represented by is preferable.
  • Examples of the conductive agent include acetylene black (AB), carbon black (CB) such as Ketjen black, and carbon materials such as graphite.
  • Examples of the binder include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide (PI), acrylic resins, and polyolefin resins. It will be done. Furthermore, these resins may be used in combination with carboxymethyl cellulose (CMC) or a salt thereof, polyethylene oxide (PEO), or the like. These may be used alone or in combination of two or more.
  • CMC carboxymethyl cellulose
  • PEO polyethylene oxide
  • the negative electrode plate 12 has a negative electrode core 12a and negative electrode mixture layers 12b formed on both surfaces of the negative electrode core 12a.
  • a foil of metal such as copper, a film with the metal disposed on the surface layer, or the like is used, for example.
  • FIG. 3 is a schematic development diagram illustrating a first region A1 and a second region A2 in which the arithmetic mean roughness of the surface of the negative electrode core body 12a is different from each other in the embodiment.
  • Both surfaces of the negative electrode core 12a include a first region A1, which is a region other than one end in the electrode plate width direction ⁇ (lower end in FIG. 2, upper end in FIG. 3), and a first region A1 on one side in the electrode plate width direction. and a second region A2 which is an end region.
  • the negative electrode core exposed portion 12c is formed at one end of the negative electrode plate 12 in the plate width direction, so the second region A2 is the region at the side end of the negative electrode core exposed portion. .
  • the negative electrode mixture layer 12b is shown by the sandy area.
  • the negative electrode mixture layer 12b slightly protrudes from the first region A1 toward the second region A2.
  • the length Ba of this protruding portion in the electrode plate width direction ⁇ means the sag width, which is the length of the portion of the negative electrode mixture layer 12b that protrudes from the planned coating area.
  • the negative electrode mixture layer 12b contains a negative electrode active material and a binder.
  • the negative electrode plate 12 is produced by, for example, applying a negative electrode mixture slurry containing a negative electrode active material, a binder, water, etc. to both surfaces of the negative electrode core body 12a, and then drying and rolling the slurry.
  • the negative electrode active material is not particularly limited as long as it can reversibly occlude and release lithium ions, and examples thereof include carbon materials such as natural graphite and artificial graphite, metals that alloy with lithium such as Si and Sn, or these materials.
  • An alloy containing , a composite oxide, etc. can be used.
  • the same resin as in the case of the positive electrode plate 11 is used as the binder contained in the negative electrode mixture layer 12b.
  • SBR styrene-butadiene rubber
  • CMC a salt thereof
  • polyacrylic acid or a salt thereof, polyvinyl alcohol, etc. can be used. These may be used alone or in combination of two or more.
  • a porous sheet having ion permeability and insulation properties is used for the separator 13.
  • porous sheets include microporous thin films, woven fabrics, and nonwoven fabrics.
  • the material for the separator 13 is preferably an olefin resin such as polyethylene or polypropylene.
  • the thickness of the separator 13 is, for example, 10 ⁇ m to 50 ⁇ m.
  • the separator 13 tends to become thinner as batteries increase in capacity and output.
  • the separator 13 has a melting point of, for example, about 130°C to 180°C.
  • the outer can 15 and the sealing body 16 constitute a metal battery case that houses the electrode body 14 and the nonaqueous electrolyte.
  • a lower current collector plate 17 is provided below the electrode body 14
  • an upper current collector plate 18 is provided above the electrode body 14 .
  • the secondary battery 10 includes a metal lower current collector plate (negative electrode current collector plate) 17 made of nickel, nickel alloy, etc. on the outer (lower) side of the electrode body 14 in the axial direction. have The negative electrode core exposed portion 12c of the electrode body 14 is joined to a disk-shaped lower current collector plate 17, and the lower current collector plate 17 is joined to the inner surface of the bottom plate portion 15a of the outer can 15.
  • the upper surface of the lower current collector plate 17 is pressed from the outside of the lower current collector plate 17 with the negative electrode core exposed portion 12c pressed.
  • the negative electrode core exposed portion 12c is joined to the lower current collector plate 17 by irradiation with laser light.
  • the electrode body 14 and the lower current collector plate 17 are placed in the outer can 15, and a laser beam is irradiated from outside the bottom plate portion 15a of the outer can 15 toward the bottom surface of the center of the lower current collector plate 17.
  • the lower current collector plate 17 is joined to the inner surface of the bottom plate portion 15a.
  • the negative electrode core exposed portion 12c is electrically connected to the outer can 15.
  • the secondary battery 10 has an upper current collector plate 18 (positive electrode current collector plate) made of metal such as aluminum or aluminum alloy on the outside (above) the electrode body 14 in the axial direction. It has an annular insulating plate 19 on the upper side.
  • the upper current collector plate 18 is disk-shaped and has a through hole in the center.
  • the exposed positive electrode core portion 11c of the electrode body 14 is joined to the lower surface of the upper current collector plate 18 by laser welding in the same manner as the exposed negative electrode core portion 12c. Specifically, before the electrode body 14 is placed in the outer can 15, the positive electrode core exposed portion 11c is pressed against the lower surface of the upper current collector plate 18, and the upper current collector plate 18 is pressed against the lower surface of the upper current collector plate 18. The positive electrode core exposed portion 11c is joined to the upper current collector plate 18 by irradiating the positive electrode core body with laser light from the outside.
  • the secondary battery 10 further includes a sealing body 16 and a connection lead 29 made of metal such as aluminum or aluminum alloy.
  • the lower end portion of the connection lead 29 is joined to the upper surface of the upper current collector plate 18 by welding or the like.
  • the connection lead 29 extends toward the sealing body 16 through the through hole of the insulating plate 19, and the upper end portion of the connection lead 29 is connected to the lower surface of the filter 22, which is the bottom plate of the sealing body 16, by welding or the like.
  • a terminal plate 26 constituting the top plate of the sealing body 16 is electrically connected to the filter 22, and the terminal plate 26 serves as a positive terminal.
  • the outer can 15 to which the negative electrode core exposed portion 12c is electrically connected via the lower current collector plate 17 serves as a negative electrode terminal.
  • the secondary battery 10 further includes a resin gasket 27 disposed between the outer can 15 and the sealing body 16.
  • the gasket 27 is sandwiched between the outer can 15 and the sealing body 16 and insulates the sealing body 16 from the outer can 15.
  • the gasket 27 has the role of a sealing material for maintaining airtightness inside the battery, and the role of an insulating material for insulating the outer can 15 and the sealing body 16.
  • the outer can 15 has an annular grooved portion 21 in a portion in the axial direction.
  • the grooved portion 21 can be formed, for example, by spinning the side surface of the cylindrical portion 15b of the outer can 15 radially inward and recessing it radially inward.
  • the grooved portion 21 supports the sealing body 16 on its upper surface.
  • the sealing body 16 seals the opening of the outer can 15.
  • the sealing body 16 has a structure in which a filter 22, a lower valve body 23, an insulating member 24, an upper valve body 25, and a terminal plate 26 are laminated in order from the electrode body 14 side.
  • Each member constituting the sealing body 16 has, for example, a disk shape or a ring shape, and each member except the insulating member 24 is electrically connected to each other.
  • the lower valve body 23 and the upper valve body 25 are connected at their respective central portions, and an insulating member 24 is interposed between their respective peripheral portions.
  • the lower valve body 23 breaks, and as a result, the upper valve body 25 swells toward the terminal plate 26 and separates from the lower valve body, thereby breaking the electrical connection between the two. is blocked.
  • the upper valve body 25 breaks and gas is discharged from the opening 26a of the terminal plate 26. By discharging this gas, it is possible to prevent the internal pressure of the secondary battery 10 from rising excessively and causing the secondary battery 10 to explode.
  • both surfaces of the negative electrode core 12a include the first region A1, which is a region other than the one end in the width direction of the electrode plate, and the end on the side where the negative electrode core is exposed. and a second region A2 which is a region at one end in the width direction of the electrode plate. Further, when the arithmetic mean roughness of the first region A1 is Ra1 and the arithmetic mean roughness of the second region A2 is Ra2, Ra1>Ra2.
  • the wettability which is the ease with which the liquid spreads, between the area where the negative electrode mixture slurry is scheduled to be applied to the negative electrode core 12a and the area where it is not expected to be coated is changed, and the wettability of the area where the negative electrode mixture slurry is planned to be applied is changed. Wettability can be kept small.
  • the wettability of the surface of the negative electrode core 12a to the liquid changes depending on the surface roughness; the smaller the surface roughness, the lower the specific surface area with which the liquid comes into contact, and therefore the lower the wettability. gender tends to be higher.
  • this characteristic is used to make the surface roughness different between the first area A1, which is the area to be coated, and the second area A2, which is the area to be uncoated. Specifically, in order to increase the wettability of only the first area A1, which is the area to be coated where adhesion of the negative electrode mixture slurry is required, the surface roughness is increased.
  • the surface roughness thereof is made smaller than that of the first area A1. Therefore, it is possible to suppress the spread of the negative electrode mixture slurry in the second area A2 and suppress the sagging of the negative electrode mixture, and to reduce the peel strength of the negative electrode mixture layer 12b with respect to the negative electrode core 12a in the first area A1. Can be made high. As described above, FIG.
  • the sagging width which is the length of the portion of the negative electrode mix layer 12b protruding from the planned coating area of the negative electrode plate 12, is Ba, but according to the present embodiment, The sag width Ba can be reduced or eliminated.
  • the thickness of the portion facing the positive electrode plate 11 can be prevented from becoming smaller than the normal thickness, so that the positive electrode can be prevented from becoming excessive with respect to the negative electrode mixture. It can be suppressed.
  • Ra1 and Ra2 satisfy the relationship of Ra1/Ra2 ⁇ 1.2, the difference in surface roughness between the first region A1 and the second region A2 becomes large, and the sagging of the negative electrode mixture is suppressed. It is possible to significantly improve the peel strength of the negative electrode mixture layer 12b with respect to the negative electrode core 12a.
  • the inventors of the present disclosure prepared a total of four types of negative electrode plates, Experimental Example 1 corresponding to the negative electrode plate 12 of the embodiment, and Experimental Examples 2-4 corresponding to the comparative example, under the conditions shown in Table 1 below.
  • a test piece obtained by cutting was prepared, and the sag width Ba of the negative electrode mixture to the uncoated portion of each negative electrode plate 12 and the peel strength of the negative electrode mixture layer were evaluated.
  • the contact angles of each of the first area A1 and the second area A2 were measured according to the following procedure.
  • (1) Install a camera and a negative electrode core (copper foil) so that the angle can be confirmed from a direction perpendicular to the longitudinal direction of the electrode plate, which is the winding direction of the electrode plate.
  • (2) Drop 1.5 ⁇ L of pure water from a syringe onto each of the first area A1 and the second area A2.
  • a negative electrode mixture slurry was prepared using the following procedure.
  • As the negative electrode active material a mixture of 95 parts by mass of graphite powder and 5 parts by mass of silicon oxide was used. Then, 100 parts by mass of the negative electrode active material, 1.2 parts by mass of styrene-butadiene rubber (SBR) as a binder, and 1 part by mass of carboxymethyl cellulose (CMC) as a thickener were mixed. Then, this mixture was dispersed in water to prepare a negative electrode mixture slurry.
  • SBR styrene-butadiene rubber
  • CMC carboxymethyl cellulose
  • FIG. 4 is a side view showing a method of applying the negative electrode mixture slurry from the coating machine 40 to the negative electrode core 42 of the experimental example.
  • Experimental example using the negative electrode mixture slurry prepared as described above, using the coating machine (die coater) 40 such that the coating end of the coating machine 40 is the boundary between the area to be coated and the area to be uncoated.
  • a negative electrode mixture slurry was applied to the negative electrode core 42 of No. 1 and dried to produce a negative electrode plate 41 having a negative electrode mixture layer 43.
  • peel strength test The peel strength of the negative electrode mixture layer 43 with respect to the negative electrode core 42 was evaluated using the following procedure.
  • Tensilon universal testing machine RTC1210 manufactured by A&D Co., Ltd. was used for the peel strength test.
  • the above negative electrode plate 41 is cut to prepare a test piece having a width of 15 mm and a length of 80 mm.
  • Table 1 shows the experimental results of the sagging width Ba and peel strength in each experimental example. From the experimental results in Table 1, in Experimental Example 2 corresponding to the comparative example, the arithmetic mean roughness Ra1, Ra2 in both the first and second regions A1, A2 of the negative electrode core is as small as 0.18. It can be seen that although the sagging width Ba was suppressed to a small value by this, the peel strength of the negative electrode mixture layer was reduced.
  • non-aqueous electrolyte secondary battery (secondary battery), 11 positive electrode plate, 11a positive electrode core, 11b positive electrode mixture layer, 11c positive electrode core exposed part, 12 negative electrode plate, 12a negative electrode core, 12b negative electrode mixture layer, 12c negative electrode core exposed part, 13 separator, 14 electrode body, 15 outer can, 15a bottom plate part, 15b cylindrical part, 16 sealing body, 17 lower current collector plate, 18 upper current collector plate, 19 insulating plate, 21 grooving part, 22 filter, 23 lower valve body, 24 insulating member, 25 upper valve body, 26 terminal plate, 27 gasket, 29 connection lead, 40 coating machine, 41 negative electrode plate, 42 negative electrode core, 43 negative electrode mixture layer, 80 negative electrode plate, 81 negative electrode core, 82 negative electrode mixture layer, 83 sagging, 90 positive electrode plate, 91 positive electrode mixture layer.

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PCT/JP2023/009994 2022-03-22 2023-03-15 非水電解質二次電池 Ceased WO2023182087A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202380027793.3A CN118872121A (zh) 2022-03-22 2023-03-15 非水电解质二次电池
JP2024510055A JPWO2023182087A1 (https=) 2022-03-22 2023-03-15
EP23774684.7A EP4498470A4 (en) 2022-03-22 2023-03-15 NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
US18/847,374 US20250201801A1 (en) 2022-03-22 2023-03-15 Non-aqueous electrolyte secondary battery

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JP2022045012 2022-03-22
JP2022-045012 2022-03-22

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JP2011187395A (ja) * 2010-03-11 2011-09-22 Panasonic Corp 非水電解質二次電池用負極板とその非水電解質二次電池用負極板の製造方法およびこれを用いた非水電解質二次電池
US20200144676A1 (en) 2018-11-05 2020-05-07 Tesla, Inc. Cell with a tabless electrode
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JP2010135342A (ja) * 2010-02-08 2010-06-17 Sony Corp 電極および電池
JP2011187395A (ja) * 2010-03-11 2011-09-22 Panasonic Corp 非水電解質二次電池用負極板とその非水電解質二次電池用負極板の製造方法およびこれを用いた非水電解質二次電池
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US20250201801A1 (en) 2025-06-19

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