WO2021039275A1 - Batterie secondaire à électrolyte non aqueux - Google Patents

Batterie secondaire à électrolyte non aqueux Download PDF

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Publication number
WO2021039275A1
WO2021039275A1 PCT/JP2020/029371 JP2020029371W WO2021039275A1 WO 2021039275 A1 WO2021039275 A1 WO 2021039275A1 JP 2020029371 W JP2020029371 W JP 2020029371W WO 2021039275 A1 WO2021039275 A1 WO 2021039275A1
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Prior art keywords
positive electrode
negative electrode
secondary battery
electrode
current collector
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PCT/JP2020/029371
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English (en)
Japanese (ja)
Inventor
和史 安藤
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三洋電機株式会社
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Publication of WO2021039275A1 publication Critical patent/WO2021039275A1/fr

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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
    • H01M10/05—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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • 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

  • This disclosure relates to a non-aqueous electrolyte secondary battery.
  • Patent Document 1 in order to prevent an internal short circuit from occurring due to burrs on the positive electrode and the negative electrode of a secondary battery provided with a wound electrode body, an insulating tape is attached to the surface of the positive electrode or the negative electrode at an assumed position of the internal short circuit. The method of doing so is disclosed.
  • An object of the present disclosure is to provide a non-aqueous electrolyte secondary battery capable of suppressing an internal short circuit due to deformation of the negative electrode.
  • the non-aqueous electrolyte secondary battery includes a wound electrode body in which a band-shaped positive electrode and a band-shaped negative electrode are wound via a separator, and an exterior body accommodating the electrode body. ..
  • the positive electrode includes a positive electrode current collector, a positive electrode mixture layer formed on both the inner peripheral side and the outer peripheral side of the positive electrode current collector, and at least the positive electrode current collector and the positive electrode mixture layer at the winding inner end of the positive electrode. It is characterized by having an insulating protective member that covers the front end surface in the winding direction and the surface of the positive electrode mixture layer on the inner peripheral side.
  • the internal short circuit can be suppressed even when the negative electrode is deformed, which may contribute to the internal short circuit.
  • FIG. 1 It is sectional drawing in the axial direction of the cylindrical secondary battery which is an example of embodiment. It is a perspective view of the winding type electrode body included in the secondary battery shown in FIG. It is a front view which showed the positive electrode and the negative electrode which make up an electrode body which is an example of Embodiment in the expanded state. It is sectional drawing of the vicinity of the winding inner end portion of a positive electrode when viewed in the direction of AA of FIG. (A) and (b) are diagrams corresponding to FIG. 4 in other embodiments, respectively. It is a radial cross-sectional view near the winding center axis of the electrode body which shows the positional relationship between the deformed part of the deformed negative electrode after a charge / discharge cycle, and the winding inner end part of a positive electrode.
  • FIG. 1 is an axial sectional view of a cylindrical secondary battery 10 which is an example of an embodiment.
  • an electrode body 14 and a non-aqueous electrolyte (not shown) are housed in an exterior body 15.
  • the electrode body 14 has a winding type structure in which the positive electrode 11 and the negative electrode 12 are wound around the separator 13.
  • the non-aqueous solvent (organic solvent) of the non-aqueous electrolyte carbonates, lactones, ethers, ketones, esters and the like can be used, and two or more of these solvents can be mixed and used. ..
  • a mixed solvent containing a cyclic carbonate and a chain carbonate For example, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC) and the like can be used as the cyclic carbonate, and dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and diethyl carbonate as the chain carbonate. (DEC) and the like can be used.
  • EC ethylene carbonate
  • PC propylene carbonate
  • BC butylene carbonate
  • DMC dimethyl carbonate
  • EMC ethyl methyl carbonate
  • diethyl carbonate diethyl carbonate
  • electrolyte salt of the non-aqueous electrolyte LiPF 6 , LiBF 4 , LiCF 3 SO 3, etc. and a mixture thereof can be used.
  • the amount of the electrolyte salt dissolved in the non-aqueous solvent can be, for example, 0.5 to 2.0 mol / L.
  • the sealing body 16 side will be referred to as “top” and the bottom side of the exterior body 15 will be referred to as “bottom”.
  • the inside of the secondary battery 10 is sealed by closing the opening of the exterior body 15 with the sealing body 16.
  • Insulating plates 17 and 18 are provided above and below the electrode body 14, respectively.
  • the positive electrode lead 19 extends upward through the through hole of the insulating plate 17 and is welded to the lower surface of the filter 22 which is the bottom plate of the sealing body 16.
  • the cap 26, which is the top plate of the sealing body 16 electrically connected to the filter 22, serves as the positive electrode terminal.
  • the negative electrode lead 20 extends to the bottom side of the exterior body 15 through the through hole of the insulating plate 18 and is welded to the inner surface of the bottom portion of the exterior body 15.
  • the exterior body 15 serves as a negative electrode terminal.
  • the negative electrode lead 20 passes through the outside of the insulating plate 18 and extends toward the bottom of the exterior body 15 and is welded to the inner surface of the bottom of the exterior body 15. .
  • the exterior body 15 is, for example, a bottomed cylindrical metal exterior can.
  • a gasket 27 is provided between the exterior body 15 and the sealing body 16 to ensure the internal airtightness of the secondary battery 10.
  • the exterior body 15 has a grooved portion 21 that supports the sealing body 16 and is formed by pressing, for example, a side surface portion from the outside.
  • the grooved portion 21 is preferably formed in an annular shape along the circumferential direction of the exterior body 15, and the sealing body 16 is supported on the upper surface thereof.
  • the sealing body 16 has a filter 22, a lower valve body 23, an insulating member 24, an upper valve body 25, and a cap 26, which 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 to each other at their central portions, and an insulating member 24 is interposed between the peripheral portions thereof.
  • FIG. 2 is a perspective view of the electrode body 14.
  • the electrode body 14 has a winding structure in which the positive electrode 11 and the negative electrode 12 are spirally wound via the separator 13.
  • the positive electrode 11, the negative electrode 12, and the separator 13 are all formed in a band shape and are spirally wound around the winding shaft so that the electrode body 14 is alternately laminated in the radial direction ⁇ .
  • the winding shaft side is called the inner peripheral side, and the opposite side is called the outer peripheral side.
  • the longitudinal direction of the positive electrode 11 and the negative electrode 12 is the winding direction ⁇
  • the band width direction of the positive electrode 11 and the negative electrode 12 is the axial direction ⁇ .
  • the positive electrode lead 19 extends in the axial direction ⁇ from substantially the center in the radial direction from the center to the outermost circumference.
  • the negative electrode lead 20 extends in the axial direction ⁇ from the vicinity of the winding shaft at the lower end of the electrode body 14.
  • a porous sheet having ion permeability and insulating property is used for the separator 13.
  • the porous sheet include a microporous thin film, a woven fabric, and a non-woven fabric.
  • an olefin resin such as polyethylene or polypropylene is preferable.
  • the thickness of the separator 13 is, for example, 10 ⁇ m to 50 ⁇ m.
  • the separator 13 tends to be thinned as the capacity and output of the battery increase.
  • the separator 13 has a melting point of, for example, about 130 ° C. to 180 ° C.
  • FIG. 3 is a front view of the positive electrode 11 and the negative electrode 12 constituting the electrode body 14.
  • the positive electrode 11 and the negative electrode 12 are shown in the expanded state.
  • the negative electrode 12 is formed larger than the positive electrode 11 in order to prevent the precipitation of lithium on the negative electrode 12.
  • the length of the negative electrode 12 in the band width direction (axial direction) ⁇ is larger than the length of the positive electrode 11 in the band width direction ⁇ .
  • the length of the negative electrode 12 in the longitudinal direction ⁇ is larger than the length of the positive electrode 11 in the longitudinal direction ⁇ .
  • the positive electrode 11 has a band-shaped positive electrode current collector 30 and a positive electrode mixture layer 32 formed on both the inner peripheral side and the outer peripheral side of the positive electrode current collector 30.
  • a metal foil such as aluminum, a film on which the metal is arranged on the surface layer, or the like is used.
  • a suitable positive electrode current collector 30 is a metal foil containing aluminum or an aluminum alloy as a main component.
  • the thickness of the positive electrode current collector 30 is, for example, 10 ⁇ m to 30 ⁇ m.
  • the positive electrode mixture layer 32 is formed on both sides of the positive electrode current collector 30 in the entire area except for the positive electrode exposed portion 34 described later.
  • the positive electrode mixture layer 32 preferably contains a positive electrode active material, a conductive agent, and a binder.
  • the positive electrode 11 is dried after 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) on both surfaces of the positive electrode current collector 30. It is produced by rolling.
  • NMP N-methyl-2-pyrrolidone
  • the positive electrode active material examples 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 the general formula Li 1 + x MO 2 (in the formula, -0.2 ⁇ x ⁇ 0.2, M contains at least one of Ni, Co, Mn, and Al). It is preferably a composite oxide represented by.
  • Examples of the above-mentioned conductive agent include carbon materials such as carbon black (CB), acetylene black (AB), Ketjen black, and graphite.
  • Examples of the binder include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide (PI), acrylic resins, and polyolefin resins. Be done. Further, these resins may be used in combination with carboxymethyl cellulose (CMC) or a salt thereof, polyethylene oxide (PEO) and the like. One of these may be used alone, or two or more of them may be used in combination.
  • CMC carboxymethyl cellulose
  • PEO polyethylene oxide
  • the positive electrode 11 is provided with a positive electrode exposed portion 34 in which the surface of the positive electrode current collector 30 is exposed.
  • the positive electrode exposed portion 34 is a portion to which the positive electrode lead 19 is connected, and the surface of the positive electrode current collector 30 is not covered with the positive electrode mixture layer 32.
  • the positive electrode exposed portion 34 is formed wider in the longitudinal direction ⁇ than the positive electrode lead 19. It is preferable that the positive electrode exposed portions 34 are provided on both sides of the positive electrode 11 so as to overlap with each other in the thickness direction of the positive electrode 11.
  • the positive electrode lead 19 is bonded to the positive electrode exposed portion 34 by, for example, ultrasonic welding.
  • a positive electrode exposed portion 34 is provided at the center of the positive electrode 11 in the longitudinal direction ⁇ over the entire length in the band width direction ⁇ .
  • the positive electrode exposed portion 34 may be formed at the winding inner end portion 11a or the winding outer end portion of the positive electrode 11, but from the viewpoint of current collection, it is preferably substantially equidistant from the winding inner end portion 11a and the winding outer end portion. It is preferable that it is provided at the position of.
  • the positive electrode lead 19 By connecting the positive electrode lead 19 to the positive electrode exposed portion 34 provided at such a position, when the positive electrode lead 19 is wound as the electrode body 14, the positive electrode lead 19 has a band width at an intermediate position in the radial direction of the electrode body 14. It is arranged so as to project upward from the end face in the direction ⁇ .
  • the positive electrode exposed portion 34 is provided, for example, by intermittent coating in which the positive electrode mixture slurry is not applied to a part of the positive electrode current collector 30.
  • the protective member 36 is an insulating member provided at the winding inner end portion 11a of the positive electrode 11. As will be described later, when the negative electrode 12 is deformed by charging and discharging the secondary battery 10, an internal short circuit is suppressed by interposing between the deformed portion of the negative electrode 12 and the winding inner end portion 11a of the positive electrode 11.
  • the width of the protective member 36 is wider than the band width of the positive electrode 11.
  • the negative electrode 12 has a band-shaped negative electrode current collector 40 and a negative electrode mixture layer 42 formed on both the inner peripheral side and the outer peripheral side of the negative electrode current collector 40.
  • a metal foil such as copper, a film on which the metal is arranged on the surface layer, or the like is used.
  • the thickness of the negative electrode current collector 40 is, for example, 5 ⁇ m to 30 ⁇ m.
  • the negative electrode mixture layer 42 is formed on both sides of the negative electrode current collector 40 over the entire area excluding the negative electrode exposed portion 44 described later.
  • the negative electrode mixture layer 42 preferably contains a negative electrode active material and a binder.
  • the negative electrode 12 is produced by applying, for example, a negative electrode mixture slurry containing a negative electrode active material, a binder, water, and the like to both surfaces of the negative electrode current collector 40, and then drying and rolling.
  • the negative electrode active material is not particularly limited as long as it can reversibly occlude and release lithium ions, for example, a carbon material such as natural graphite or artificial graphite, a metal alloying with lithium such as Si or Sn, or these. Alloys, oxides, etc. containing the above can be used.
  • the binder contained in the negative electrode mixture layer 42 for example, the same resin as in the case of the positive electrode 11 is used.
  • SBR styrene-butadiene rubber
  • CMC styrene-butadiene rubber
  • polyacrylic acid or a salt thereof, polyvinyl alcohol and the like can be used. One of these may be used alone, or two or more of them may be used in combination.
  • the negative electrode exposed portion 44 is provided at the winding inner end portion of the negative electrode 12 in the longitudinal direction ⁇ over the entire length in the band width direction ⁇ of the current collector.
  • the negative electrode exposed portion 44 is a portion to which the negative electrode lead 20 is connected, and the surface of the negative electrode current collector 40 is not covered with the negative electrode mixture layer 42.
  • the negative electrode exposed portion 44 is formed wider in the longitudinal direction ⁇ than the width of the negative electrode lead 20. It is preferable that the negative electrode exposed portions 44 are provided on both sides of the negative electrode 12 so as to overlap each other in the thickness direction of the negative electrode 12.
  • the negative electrode lead 20 is bonded to the inner peripheral surface of the negative electrode current collector 40 by, for example, ultrasonic welding.
  • One end of the negative electrode lead 20 is arranged in the negative electrode exposed portion 44, and the other end extends downward from the lower end of the negative electrode exposed portion 44.
  • the arrangement position of the negative electrode lead 20 is not limited to the example shown in FIG. 3, and the negative electrode lead 20 may be provided only at the unwinding end portion of the negative electrode 12. Further, the negative electrode lead 20 may be provided at the winding inner end portion and the winding outer end portion of the negative electrode 12. In this case, the current collecting property is improved.
  • the negative electrode exposed portion 44 of the unwound end portion of the negative electrode 12 into contact with the inner peripheral surface of the exterior body 15 (see FIG. 1), the unwound end portion of the negative electrode 12 is brought into the exterior body 15 without using the negative electrode lead 20. It may be connected electrically.
  • the negative electrode exposed portion 44 is provided, for example, by intermittent coating in which the negative electrode mixture slurry is not applied to a part of the negative electrode current collector 40.
  • FIG. 4 is a cross-sectional view of the vicinity of the winding inner end portion 11a of the positive electrode 11 when viewed in the direction AA of FIG.
  • the protective member 36 covers the tip surface of the positive electrode current collector 30 and the positive electrode mixture layer 32 in the winding direction, and the surface of the positive electrode mixture layer 32 on the inner peripheral side at the winding inner end portion 11a of the positive electrode 11.
  • the protective member 36 may have a base material layer 38 and an adhesive layer 39.
  • the thickness of the protective member 36 is, for example, 20 ⁇ m to 70 ⁇ m, preferably 25 ⁇ m to 60 ⁇ m.
  • the thickness of the protective member 36 and each layer can be measured by cross-sectional observation using a scanning electron microscope (SEM).
  • the base material layer 38 may contain an organic material and an inorganic material.
  • the main component of the organic material contained in the base material layer 38 is preferably a resin having excellent insulating properties, electrolyte resistance, heat resistance, piercing strength and the like.
  • the main component of the base material layer 38 is preferably a resin such as polypropylene (PP).
  • PP polypropylene
  • an ester resin such as polyethylene terephthalate (PET), polyimide (PI), polyphenylene sulfide, polyamide and the like can also be adopted.
  • PET polyethylene terephthalate
  • PI polyimide
  • polyphenylene sulfide polyamide and the like
  • One type of these resins may be used alone, or two or more types may be used in combination.
  • the main component of the base material layer 38 is preferably PI from the viewpoint of hardness.
  • PP is inexpensive and easily available, and has sufficient rigidity as the base material layer 38 if it has the above-mentioned thickness. Therefore, PP is preferable as the main component of the base material layer 38 from the viewpoint of cost.
  • the thickness of the base material layer 38 is, for example, 10 ⁇ m to 45 ⁇ m, preferably 15 ⁇ m to 35 ⁇ m.
  • the thickness of the base material layer 38 is preferably thicker than that of the adhesive layer 39.
  • the adhesive layer 39 is a layer for imparting adhesiveness to the positive electrode 11 to the protective member 36.
  • the adhesive layer 39 is formed by applying an adhesive material such as an adhesive on one surface of the base material layer 38.
  • the adhesive layer 39 can be formed by using an adhesive (resin) having excellent insulating properties, electrolyte resistance, and the like.
  • the adhesive constituting the adhesive layer 39 may be a hot melt type that develops adhesiveness by heating or a thermosetting type that cures by heating, but from the viewpoint of productivity and the like, it has adhesiveness at room temperature. Those are preferable.
  • the adhesive layer 39 is composed of, for example, an acrylic adhesive or a synthetic rubber adhesive.
  • the thickness of the adhesive layer 39 is, for example, 5 ⁇ m to 30 ⁇ m.
  • the protective member 36 is not limited to the two-layer structure, and may be, for example, a three-layer structure in which an inorganic particle-containing layer is formed between the base material layer 38 and the adhesive layer 39. By using such a three-layer structure, the heat resistance of the protective member 36 can be improved.
  • the inorganic particle-containing layer preferably has a layer structure in which inorganic particles are dispersed in a resin matrix constituting the layer.
  • the resin constituting the inorganic particle-containing layer preferably has excellent insulating properties, electrolyte resistance, and the like, and also has good adhesiveness to the inorganic particles and the base material layer 38. Examples of suitable resins include acrylic resins, urethane resins, and copolymers thereof.
  • the inorganic particle-containing layer is formed by, for example, applying a resin solution containing inorganic particles on one surface of the base material layer 38.
  • the thickness of the inorganic particle-containing layer is, for example, 0.5 ⁇ m to 10 ⁇ m, preferably 1 ⁇ m to 5 ⁇ m.
  • FIG. 5A and (b) of FIG. 5 are diagrams corresponding to FIG. 4 in other embodiments, respectively.
  • the protective member 36 faces the adhesive layer 39 toward the winding inner end portion 11a of the positive electrode 11, the surface of the positive electrode mixture layer 32 on the outer peripheral side, the positive electrode current collector 30, and the positive electrode mixture layer 32. It covers the tip surface in the winding direction and the surface of the positive electrode mixture layer 32 on the inner peripheral side.
  • FIG. 5B one protective member 36 having one end of the adhesive layer 39 attached to the surface of the positive electrode mixture layer 32 on the outer peripheral side and the surface of the positive electrode mixture layer 32 on the inner peripheral side.
  • Another protective member 36 to which one end of the adhesive layer 39 is attached is attached to each other by both adhesive layers 39 at the other end, and the two protective members 36 are attached to the winding inner end portion 11a of the positive electrode 11. Covering.
  • the form in which the protective member 36 is provided at the winding inner end portion 11a of the positive electrode 11 is not limited to the examples of FIGS. 4 and 5 (a) and 5 (b).
  • the positive electrode current collector 30 and the positive electrode mixture layer 32 Both ends of the band width direction ⁇ may be covered.
  • FIG. 6 shows the positional relationship between the deformed portion 46 of the deformed negative electrode 12 after the charge / discharge cycle and the winding inner end portion 11a of the positive electrode 11.
  • the protective member 36 is provided on the winding inner end portion 11a of the positive electrode 11 so as to cover the tip surface of the positive electrode current collector 30 and the positive electrode mixture layer 32 in the winding direction and the surface of the positive electrode mixture layer 32 on the inner peripheral side. Has been done.
  • the positive electrode 11 has a shorter length of ⁇ in the longitudinal direction than the negative electrode 12.
  • the positive electrode 11 starts to be wound, so that the portion of the negative electrode 12 facing the winding inner end portion 11a of the positive electrode mixture layer 32 is formed. Is likely to have a step due to the thickness of the positive electrode mixture layer 32. Then, pressure is applied to the step by charging and discharging the secondary battery 10, and a deformed portion 46 as illustrated in FIG. 6 is generated in the negative electrode 12.
  • the separator 13 interposed between them is physically damaged, but electrically protects the insulating property.
  • the member 36 suppresses an internal short circuit.
  • one end of the negative electrode lead 20 is joined to the negative electrode exposed portion 44 at the winding inner end portion of the negative electrode 12, and the other end of the negative electrode lead 20 is bonded as shown in FIG. It is joined to the bottom surface of the exterior body 15.
  • the winding inner end of the negative electrode 12 is fixed to the exterior body 15 via the negative electrode lead 20
  • the pressure applied to the negative electrode 12 during charging and discharging is concentrated on the winding inner end of the negative electrode 12. Therefore, when the negative electrode lead 20 is connected to the winding inner end of the negative electrode 12, the effect of the present disclosure becomes more remarkable.
  • Example> 100 parts by mass of LiNi 0.88 Co 0.09 Al 0.03 O 2 and 1 part by mass of acetylene black and 1 part by mass of polyvinylidene fluoride are mixed to form N-methyl-2-pyrrolidone (NMP). Was added in an appropriate amount to prepare a positive mixture slurry. Next, the positive electrode mixture slurry was applied to both sides of a long positive electrode current collector made of an aluminum foil having a thickness of 15 ⁇ m, and the coating film was heated to 100 ° C. to 150 ° C. and dried.
  • NMP N-methyl-2-pyrrolidone
  • a positive electrode exposed portion was provided in a substantially central portion of the positive electrode in the longitudinal direction ⁇ with no mixture layer and the surface of the current collector was exposed, and an aluminum positive electrode lead was welded to the positive electrode exposed portion.
  • [Preparation of negative electrode] 95 parts by mass of graphite, 5 parts by mass of Si oxide, 1 part by mass of carboxymethyl cellulose (CMC) and 1 part by mass of styrene-butadiene rubber (SBR) are mixed, and an appropriate amount of water is added to the negative electrode. A mixture slurry was prepared. Next, the negative electrode mixture slurry was applied to both sides of a long negative electrode current collector made of a copper foil having a thickness of 8 ⁇ m, and the coating film was dried. After compressing the dried coating film using a roller, it was cut into a predetermined electrode size to prepare a positive electrode having negative electrode mixture layers formed on both sides of the negative electrode current collector. A negative electrode exposed portion where the surface of the current collector was exposed without the presence of the mixture layer was provided at the inner end of the winding, and a nickel / copper negative electrode lead was welded to the negative electrode exposed portion.
  • CMC carboxymethyl cellulose
  • SBR styrene-butadiene rubber
  • a protective member having a thickness of 25 ⁇ m having a base material layer containing PP as a main component and an adhesive layer was used. As shown in FIG. 5B, one protective member having one end attached to the surface of the positive electrode mixture layer on the outer peripheral side and another one having one end attached to the surface of the positive electrode mixture layer on the inner peripheral side. The two protective members are attached to each other by both adhesive layers 39 at the other end, and the two protective members cover the winding inner end of the positive electrode. The width of the protective member was slightly larger than the width of the positive electrode.
  • the positive electrode and the negative electrode were spirally wound via a polyethylene separator to prepare an electrode body. Insulating plates were arranged above and below the electrode body, and the electrode body was housed in the case body. Next, the negative electrode reed was welded to the bottom of the case body, and the positive electrode reed was welded to the sealing body having an internal pressure actuated safety valve. Then, after injecting electrolyte into the inside of the case body by a decompression method, the opening of the case body is closed so that the opening end of the case body is crimped to the sealing body via a gasket, and the cylindrical secondary battery is used. Was produced.
  • a battery was produced in the same manner as in Example 1 except that the positive electrode was not provided with a protective member.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Connection Of Batteries Or Terminals (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

Batterie secondaire à électrolyte non aqueux pouvant supprimer un court-circuit interne provoqué par la déformation d'une électrode négative. Une batterie secondaire à électrolyte non aqueux selon un aspect de la présente invention est pourvu : d'un corps d'électrode enroulé dans lequel une électrode positive de type bande et une électrode négative de type bande sont enroulées avec un séparateur entre elles ; et d'un corps extérieur qui stocke le corps d'électrode. L'électrode positive comporte un collecteur d'électrode positive (30), des couches de mélange d'électrode positive (32) formées sur les surfaces circonférentielles intérieure et extérieure du collecteur d'électrode positive (30), et un élément de protection isolant (36) qui recouvre, au niveau d'une extrémité intérieure d'enroulement (11a) de l'électrode positive, les surfaces d'extrémité avant du collecteur d'électrode positive (30) et des couches de mélange d'électrode positive (32) dans la direction d'enroulement et recouvrent les surfaces des couches de mélange d'électrode positive (32) sur le côté circonférentiel intérieur.
PCT/JP2020/029371 2019-08-28 2020-07-31 Batterie secondaire à électrolyte non aqueux WO2021039275A1 (fr)

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JP2019155151A JP2022153675A (ja) 2019-08-28 2019-08-28 非水電解質二次電池
JP2019-155151 2019-08-28

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WO2021039275A1 true WO2021039275A1 (fr) 2021-03-04

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* Cited by examiner, † Cited by third party
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