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WO2025141819A1 - Batterie secondaire au lithium - Google Patents

Batterie secondaire au lithium Download PDF

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Publication number
WO2025141819A1
WO2025141819A1 PCT/JP2023/047091 JP2023047091W WO2025141819A1 WO 2025141819 A1 WO2025141819 A1 WO 2025141819A1 JP 2023047091 W JP2023047091 W JP 2023047091W WO 2025141819 A1 WO2025141819 A1 WO 2025141819A1
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WIPO (PCT)
Prior art keywords
positive electrode
less
current collector
secondary battery
peak
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Pending
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PCT/JP2023/047091
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English (en)
Japanese (ja)
Inventor
雅継 中野
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Terawatt Technology KK
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Terawatt Technology KK
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Priority to PCT/JP2023/047091 priority Critical patent/WO2025141819A1/fr
Publication of WO2025141819A1 publication Critical patent/WO2025141819A1/fr
Pending 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding

Definitions

  • the present invention relates to a lithium secondary battery.
  • lithium secondary batteries which charge and discharge by the movement of lithium ions between the positive and negative electrodes, are known to exhibit high voltage and high energy density.
  • a typical lithium secondary battery is the lithium-ion secondary battery (LIB), which has active materials capable of retaining lithium elements in the positive and negative electrodes and charges and discharges by the exchange of lithium ions between the positive and negative active materials.
  • LIB lithium-ion secondary battery
  • the present invention was made in consideration of the above circumstances, and aims to provide a lithium secondary battery that has excellent cycle characteristics and tab temperature stability when ultrasonic welding is performed on the current collector film.
  • the present invention provides a lithium secondary battery with excellent cycle characteristics and tab temperature stability.
  • the present embodiment is not limited to the present embodiment.
  • Various modifications of the present invention are possible without departing from the gist of the invention.
  • the same elements are given the same reference numerals, and duplicated explanations will be omitted.
  • positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings.
  • the dimensional ratios of the drawings are not limited to those shown.
  • Lithium Secondary Battery The basic configuration of a lithium secondary battery according to one embodiment of the present invention will be described with reference to Fig. 1. As shown in Fig. 1, the lithium secondary battery according to one embodiment of the present invention includes a plurality of positive electrodes 10, a plurality of separators 20, and a plurality of negative electrodes 30, and the positive electrodes 10 and the negative electrodes 30 are disposed apart from each other via the separators 20. Each component will be described in detail below.
  • FIG. 2 is a perspective view showing an example of the positive electrode 10 of this embodiment.
  • the positive electrode 10 of this embodiment has a positive electrode main body 101 and a positive electrode tab lead portion 102, and the positive electrode tab lead portion 102 is a shape in which the positive electrode current collector constituting the positive electrode 10 extends from the positive electrode main body 101.
  • the positive electrode 10 includes a positive electrode current collector and may further include a positive electrode active material.
  • the positive electrode 10 of this embodiment is composed of only a positive electrode current collector, it is composed of a positive electrode current collector film including a resin layer 202 and an aluminum (Al) layer 201 formed on both sides thereof.
  • the positive electrode tab 11 is overlapped with a stack 12 of positive electrode tab lead portions, which are the positive electrode end portions of the battery stack A, and joined by welding.
  • welding methods include ultrasonic welding, laser welding, resistance welding, and spot welding. Among these, ultrasonic welding is suitable and preferable for the lithium secondary battery of this embodiment, since it is necessary to weld the stack including the resin layer 202.
  • the lithium secondary battery of this embodiment includes a plurality of positive electrodes 10, a plurality of positive electrode tab lead portions 102 extending from the laminate, and a positive electrode tab 11 joined to the plurality of positive electrode tab lead portions.
  • the positive electrode tab lead portion 102 is a body portion of a positive electrode current collector constituting the positive electrode 10 extending from the laminate.
  • the positive electrode body portion of the positive electrode current collector and the positive electrode tab lead portion 102 include a resin layer 202 and an aluminum layer 201 formed on both sides of the resin layer 202.
  • the positive electrode laminate is joined from the positive electrode lead of each positive electrode collector to a tab terminal, and connected to the outside during charging and discharging.
  • ultrasonic welding, laser welding, resistance welding, spot welding, etc. are used as a method for joining the electrode lead to the tab terminal, but when a collector film having a resin layer 202 and an aluminum layer 201 formed on both sides of the resin layer 202 is used, ultrasonic welding is often used because no current flows through the resin layer 202.
  • the inventors have confirmed that even when ultrasonic welding is performed under the same conditions, depending on the specifications of the current collector film, the connection resistance increases due to partial welding, and there is room for improvement in the performance of the lithium secondary battery and the temperature stability of the tab during charging and discharging.
  • the performance of the lithium secondary battery is improved and the temperature stability of the tab during charging and discharging is also improved when the 2 ⁇ pattern of the X-ray diffraction measurement of the aluminum layer 201 has at least peak A at 38.0° or more and 39.0° or less, the ratio (B/A) of the intensity of peak B at 44.0° or more and 45.0° or less to the intensity of peak A is 0.4 or less, and the half-width of peak A is 0.4° or less.
  • the reasons for this are presumed to be as follows, but are not limited to these.
  • the peak A is a peak indicating the orientation of the (111) plane in the aluminum layer 201
  • the peak B is a peak indicating the orientation of the (200) plane.
  • the intensity of peak B relative to the intensity of peak A is 0.4 or less and the half-width of peak A is 0.4° or less
  • the orientation of the (200) plane is suppressed while the orientation and crystallinity of the (111) plane are maximized.
  • the (111) plane is a slip plane of aluminum having a face-centered cubic lattice structure, shear deformation and plastic deformation are likely to occur, which is believed to be the reason why welding by ultrasonic lateral vibration is advantageous and the connection resistance between the positive electrode tab 11 and the positive electrode tab lead portion 102 is reduced. Therefore, it is considered that the lithium secondary battery of this embodiment has excellent cycle characteristics and temperature stability of the tab during charging and discharging as a result of the synergistic effects of the above factors. However, the factors are not limited to those mentioned above.
  • the half-width is the value of the 2 ⁇ width at exactly half the height of the maximum value of the peak in the 2 ⁇ pattern of X-ray diffraction measurement, and is called Full Width at Half Maximum in English, or FWHM.
  • the half-width being within this range means that the crystallinity of the (111) crystal plane is high, and the use of a positive electrode current collector including an aluminum layer 201 exhibiting such orientation and crystallinity improves the cycle characteristics of the battery and the temperature stability of the tab.
  • the half-width of the peak A may be 0.01° or more, 0.05° or more, or 0.1° or more.
  • the ratio (B/A) of the intensity of peak B at 44.0° or more and 45.0° or less to the intensity of peak A is 0.4 or less, preferably 0.35 or less, more preferably 0.3 or less, even more preferably 0.2 or less, even more preferably 0.15 or less, and particularly preferably 0.1 or less.
  • An intensity ratio (B/A) of 0.4 or less means that the orientation of the (111) plane is much more dominant than that of the (200) plane, and by using a positive electrode current collector including the aluminum layer 201 exhibiting such an orientation, the cycle characteristics of the battery and the temperature stability of the tab are improved.
  • the position of peak B may be 44.1° or more and 44.9° or less, or 44.2° or more and 44.8° or less.
  • the half-width of peak B is preferably 0.3° or less, 0.2° or less, or 0.1° or less. If the half-width of peak B is within the above range, the cycle characteristics of the battery and the temperature stability of the tab tend to be further improved. In addition, the half-width of peak B may be 0.01° or more, or 0.05° or more.
  • the ratio (C/A) of the intensity of peak C at 64.6° to 65.6° to the intensity of peak A is preferably 0.2 or less, more preferably 0.1 or less, even more preferably 0.05 or less, and even more preferably 0.03 or less.
  • An intensity ratio (C/A) of 0.2 or less means that the orientation of the (111) plane is much more predominant than that of the (220) plane, and by using a positive electrode current collector including an aluminum layer 201 exhibiting such an orientation, the cycle characteristics of the battery and the temperature stability of the tab are improved.
  • the position of peak C may be 64.7° to 65.5°, or 64.8° to 65.4°.
  • the X-ray diffraction measurement may be performed by a conventional method using a commercially available X-ray diffraction measurement device.
  • a commercially available X-ray diffraction measurement device For example, it is possible to use Rigaku Corporation's "RINT-Ultima" (X-ray diffraction device) and use CuK ⁇ radiation as the X-ray source.
  • each aluminum layer 201 is preferably 0.2 ⁇ m to 10 ⁇ m, 0.3 ⁇ m to 5.0 ⁇ m, 0.5 ⁇ m to 3.0 ⁇ m, or 0.8 ⁇ m to 2.0 ⁇ m.
  • the ratio of the total thickness of the aluminum layer 201 to the thickness of the resin layer 202 is preferably 0.1 to 1.0, 0.2 to 0.6, or 0.3 to 0.5.
  • a pressure of 1 ⁇ 10 ⁇ 2 Pa or more is preferable, a pressure of 1 ⁇ 10 ⁇ 2 Pa or more and 5 ⁇ 10 ⁇ 1 Pa or less is more preferable, and a pressure of 5 ⁇ 10 ⁇ 2 Pa or more and 5 ⁇ 10 ⁇ 1 Pa or less is even more preferable.
  • processing such as rolling is performed after the aluminum layer 201 is formed, the orientation of the (111) plane tends to decrease, so it is preferable not to perform a processing step such as rolling after the aluminum layer 201 is formed.
  • the orientation of the aluminum layer tends to change.
  • the positive electrode active material is a material that causes an electrode reaction, i.e., an oxidation reaction and a reduction reaction, in the positive electrode 10.
  • the positive electrode active material of this embodiment is not particularly limited, but is, for example, contained in a positive electrode active material composition that includes a binder, a conductive additive, a sacrificial positive electrode agent, and other additives, and the positive electrode active material composition is applied to at least one or both sides of a positive electrode current collector and press-molded to form a positive electrode active material layer on at least one or both sides of the positive electrode current collector.
  • the method of disposing the positive electrode active material layer on the positive electrode current collector is not limited to press molding, and examples include a method of including a thermosetting compound in the positive electrode active material composition and curing it by heating, a method of including a photocurable compound in the positive electrode active material composition and curing it by irradiating it with light, and a method of using a two-component curing composition as the positive electrode active material composition and curing it by mixing the two components.
  • the positive electrode active material layer of the present embodiment may contain one or more compounds represented by the general formula: Li z Ni x Co y M 1-x-y O 2 + ⁇ (wherein 0.5 ⁇ x ⁇ 1.0, 0 ⁇ y ⁇ 0.35, 0.9 ⁇ z ⁇ 1.3, ⁇ 0.2 ⁇ 0.15, and M is one or more elements selected from the group consisting of Mn, Al, V, Mg, Mo, Nb, Ti, Zr, Fe, Cu, Cr, Zn, F, and B).
  • the positive electrode active material layer contains one or more compounds represented by the general formula: Li z Ni x Co y M 1-x-y O 2 + ⁇ (wherein 0.7 ⁇ x ⁇ 1.0, 0 ⁇ y ⁇ 0.35, 0.9 ⁇ z ⁇ 1.3, ⁇ 0.2 ⁇ 0.15, M is one or more elements selected from the group consisting of Mn, Al, V, Mg, Mo, Nb, Ti, Zr, Fe, Cu, Cr, Zn, F, and B.).
  • M is one or more elements selected from the group consisting of Mn, Al, V, Mg, Mo, Nb, Ti, Zr, Fe, Cu, Cr, Zn, F, and B.
  • the redox shuttle reaction is more likely to occur, but by containing an additive to be described in detail below in the electrolyte, the reaction is suppressed, and there is a tendency for the electrolyte to have excellent performance stability at high temperatures.
  • the positive electrode active material may include other positive electrode active materials other than the above-mentioned compounds.
  • the other positive electrode active material of the present embodiment may include a host material of lithium element (typically, lithium ion).
  • Such other positive electrode active materials include, but are not limited to, metal oxides and metal phosphates.
  • the metal oxides include, but are not limited to, cobalt oxide-based compounds, manganese oxide-based compounds, and nickel oxide-based compounds.
  • the metal phosphates include, but are not limited to, iron phosphate-based compounds, and cobalt phosphate-based compounds.
  • the other positive electrode active materials may be used alone or in combination of two or more.
  • the positive electrode active material composition may contain a binder.
  • a binder By containing a binder, the positive electrode active material layer is more easily bound to the positive electrode current collector, and flexibility is improved after the positive electrode active material layer is disposed on the positive electrode current collector.
  • the binder of the present embodiment is not particularly limited, but examples thereof include polyvinylidene fluoride; modified polyvinylidene fluoride obtained by introducing functional groups such as hydroxyl, amino, carbonyl, carboxyl, phenyl, and methyl groups into polyvinylidene fluoride; polytetrafluoroethylene; modified polytetrafluoroethylene obtained by introducing functional groups such as hydroxyl, amino, carbonyl, carboxyl, phenyl, and methyl groups into polytetrafluoroethylene; block copolymers, random copolymers, and graft copolymers having tetrafluoroethylene as a constituent unit; styrene butadiene rubber; carboxymethyl
  • the positive electrode active material composition of the present embodiment may include a sacrificial positive electrode agent.
  • the sacrificial positive electrode agent of the present embodiment is a lithium-containing compound that undergoes an oxidation reaction and does not substantially undergo a reduction reaction in the charge/discharge potential range of the positive electrode active material.
  • the sacrificial positive electrode agent examples include, but are not limited to, lithium oxides such as Li 2 O 2 ; lithium nitrides such as Li 3 N; lithium sulfide-based solid solutions such as Li 2 S-P 2 S 5 , Li 2 S-LiCl, Li 2 S-LiBr, and Li 2 S-LiI; and iron-based lithium oxides such as Li 1+x (Ti 1-y Fe y ) 1-x O 2 (0 ⁇ x ⁇ 0.25, 0.4 ⁇ y ⁇ 0.9), Li 2-x Ti 1-z Fe z O 3-y (0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 1, 0.05 ⁇ z ⁇ 0.95), and Li 5 FeO 4.
  • the sacrificial positive electrode agent may be used alone or in combination of two or more types.
  • the ultrasonic welding may be performed while applying pressure.
  • pressure for example, as shown in FIG. 5
  • heat is generated at the positive electrode tab joint 13, and the positive electrode tab joint 13 tends to become thinner.
  • the separator 20 of the present embodiment is not particularly limited as long as it has the function of physically and/or electrically isolating the positive electrode 10 and the negative electrode 30 and the function of ensuring the ion conductivity of lithium ions.
  • Examples of such a separator include insulating porous members, polymer electrolytes, gel electrolytes, and inorganic solid electrolytes, and typically includes at least one selected from the group consisting of insulating porous members, polymer electrolytes, and gel electrolytes.
  • one type of member may be used alone, or two or more types of members may be used in combination.
  • Polymers that may be included in the polymer electrolyte and gel electrolyte include, but are not limited to, polymers containing functional groups containing oxygen atoms such as ethers and esters, halogen groups, and polar groups such as cyano groups.
  • the negative electrode active material is not particularly limited, but examples thereof include lithium metal and alloys containing lithium metal, carbon-based materials, metal oxides, and metals that alloy with lithium and alloys containing the metals.
  • the carbon-based materials are not particularly limited, but examples thereof include graphene, graphite, hard carbon, and carbon nanotubes.
  • the metal oxides are not particularly limited, but examples thereof include titanium oxide-based compounds and cobalt oxide-based compounds.
  • the metals that alloy with lithium are not particularly limited, but examples thereof include silicon, germanium, tin, lead, aluminum, and gallium.
  • the negative electrode tab may be made of at least one material selected from the group consisting of copper, titanium, stainless steel, nickel, and alloys thereof.
  • the negative electrode tab is preferably made of at least one material selected from the group consisting of copper, nickel, and alloys thereof, and more preferably made of copper plated with nickel.
  • the lithium secondary battery may contain an electrolyte.
  • the electrolyte is a liquid containing a solvent and an electrolyte, and has ion conductivity.
  • the electrolyte may be referred to as a liquid electrolyte, and acts as a conductive path for lithium ions. Therefore, when a lithium secondary battery contains an electrolyte, the internal resistance is reduced, and the energy density, capacity, and cycle characteristics can be improved.
  • the electrolyte is, for example, a solution that fills the case (pouch) of the lithium secondary battery.
  • the electrolyte may also be impregnated into the separator 20, or may be held in a polymer to form a polymer electrolyte or a gel electrolyte.
  • fluorinated solvents examples include 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, and 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether.
  • the battery When manufacturing a lithium ion battery, the battery may be manufactured in the same manner as the above-mentioned battery manufacturing method, except that a lithium host material is used for the negative electrode 30.
  • the manufacturing method of the negative electrode 30 having such a host material is not particularly limited, but is, for example, as follows. If necessary, the above-mentioned negative electrode active material is mixed with a binder, a conductive assistant, and other additives, which will be described in detail below, to obtain a negative electrode active material composition.
  • the negative electrode active material or the obtained negative electrode active material composition is applied to both sides or one side of the above-mentioned negative electrode current collector, and pressed to form a negative electrode active material layer on both sides or one side of the negative electrode current collector, thereby obtaining a molded body.
  • the obtained molded body is punched out to a predetermined size by punching to obtain the negative electrode 30.
  • the lithium secondary battery of this embodiment can be made into an anode-free lithium battery, lithium ion battery, lithium metal battery, lithium sulfur battery, lithium oxygen battery, or lithium air battery by adding additional components or changing the materials used in each component, and among these, the anode-free lithium battery, lithium ion battery, and lithium metal battery configurations are particularly suitable.
  • the shape of the battery of the lithium secondary battery of this embodiment is not particularly limited, and may be, for example, a sheet type, a laminated sheet type, a thin shape, a cylindrical shape with a bottom, a rectangular shape with a bottom, etc. From the viewpoint of more effectively and reliably achieving the effects of this embodiment, a sheet type, a laminated sheet type, or a thin shape is preferable.
  • Example 1 Preparation of Positive Electrode 1.1.1. Preparation of Positive Electrode Current Collector (Example 1) A 6 ⁇ m polyethylene terephthalate (PET) film obtained by injection molding was set in a deposition apparatus as a positive electrode current collector, and a 1 ⁇ m aluminum thin film was formed on both sides of the PET film to obtain a current collector film. A 60 ⁇ m positive electrode active material layer was formed on both sides of the current collector film by the method described below, and cut out to obtain a positive electrode main body part of a size (4 cm ⁇ 4 cm) with a positive electrode tab lead of 0.5 cm ⁇ 3 cm, to obtain a positive electrode with a thickness of 128 ⁇ m.
  • PET polyethylene terephthalate
  • Example 2 A 6 ⁇ m PET film obtained by injection molding was set in a deposition apparatus as a positive electrode current collector, and a 1 ⁇ m thin aluminum film was formed on both sides of the PET film to obtain a current collector film.
  • a positive electrode active material layer was formed by the method described below, and cut out to obtain a negative electrode of the same size and shape as in Example 1 to obtain a positive electrode.
  • the 2 ⁇ pattern of the X-ray diffraction measurement performed on this positive electrode current collector film is shown in FIG.
  • Comparative Example 1 A 1 ⁇ m PET film obtained by injection molding was set in a deposition apparatus as a positive electrode current collector, and a 6 ⁇ m thin aluminum film was formed on both sides of the PET film to obtain a current collector film.
  • a positive electrode active material layer was formed by the method described below, and cut out to obtain a negative electrode of the same size and shape as in Example 1, to obtain a positive electrode.
  • Comparative Example 2 A 1 ⁇ m PET film obtained by injection molding was set in a deposition apparatus as a positive electrode current collector, and a 6 ⁇ m thin aluminum film was formed on both sides of the PET film to obtain a current collector film. A positive electrode active material layer was formed by the method described below, and cut out to obtain a negative electrode of the same size and shape as in Example 1 to obtain a positive electrode. The 2 ⁇ pattern of the X-ray diffraction measurement performed on this positive electrode current collector film is shown in FIG.
  • the positive electrode current collector film obtained above was subjected to X-ray diffraction measurement using "RINT-Ultima” manufactured by Rigaku Corporation, and the associated software was used to detect each peak and calculate the full width at half maximum (FWHM).
  • the measurement conditions were as follows. ⁇ Conditions for X-ray diffraction measurement> ⁇ Goniometer: Ultima IV (Protectus ADS) Attachment: Standard sample stage Scanning Mode: 2Theta/Theta ⁇ Scanning Type: Continuous Scanning ⁇ X-Ray: 40kV/40mA Divergence slit: 1/2° Divergence vertical limit slit: 10 mm Scattering slit: 8 mm - Receiving slit: open
  • a positive electrode active material composition was prepared by mixing 96 parts by mass of LiNi0.8Co0.15Al0.05O2 as a positive electrode active material, 2 parts by mass of carbon black as a conductive assistant, and 2 parts by mass of polyvinylidene fluoride (PVDF) as a binder in N - methyl-pyrrolidone (NMP) as a solvent.
  • PVDF polyvinylidene fluoride
  • NMP N - methyl-pyrrolidone
  • a current collector film was used in which a 1.0 ⁇ m thick metal layer of copper was vapor-deposited on both sides of a 6.0 ⁇ m thick PET film as a resin layer.
  • a negative electrode active material composition was prepared by mixing 97.0 parts by mass of graphite as a negative electrode active material, 0.5 parts by mass of carbon black as a conductive assistant, and 1.5 parts by mass of carboxymethyl cellulose (CMC) and 1.0 parts by mass of styrene-butadiene rubber (SBR) as a binder in water as a solvent.
  • CMC carboxymethyl cellulose
  • SBR styrene-butadiene rubber
  • This negative electrode active material composition was applied to a part of both sides of the negative electrode current collector film obtained above so that the basis weight was 15 mg/cm 2 , and pressed to form a negative electrode active material layer on both sides of the negative electrode current collector.
  • the part where the negative electrode active material layer was formed was cut out to a predetermined size (4 cm x 4 cm) so that the part where the negative electrode active material layer was formed was the negative electrode current collector part, and the part where the negative electrode active material layer was not formed was the negative electrode lead part, to obtain a negative electrode 30.
  • Lithium hexafluorophosphate LiPF 6 was dissolved at a concentration of 1 M in a solvent in which ethylene carbonate (EC) and dimethyl carbonate (DMC) were mixed at a volume ratio of 3:7.
  • an electrolyte was prepared.
  • the average thickness of the resin layer is 3.0 ⁇ m or more and 10.0 ⁇ m or less, The average thickness of the aluminum layer is 0.5 ⁇ m or more and 3.0 ⁇ m or less.
  • the resin layer contains at least one selected from the group consisting of polyethylene terephthalate, polypropylene, polyamide, acrylic resin, polycarbonate, polyethylene, polyvinyl chloride, and polystyrene.
  • the resin layer is made of polyethylene terephthalate or polypropylene.
  • the positive electrode tab lead portion is joined to the positive electrode tab by ultrasonic welding.
  • the lithium secondary battery of the present invention has excellent cycle characteristics and temperature stability of the tab, and therefore has industrial applicability as an electricity storage device for a variety of applications.

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

La présente invention concerne une batterie secondaire au lithium ayant d'excellentes caractéristiques de cycle et une excellente stabilité thermique de languette. La présente invention concerne une batterie secondaire au lithium comprenant : un stratifié incluant une pluralité d'électrodes positives, une pluralité de séparateurs et une pluralité d'électrodes négatives ; une pluralité de parties de fil de languette d'électrode positive s'étendant depuis le stratifié ; et une languette d'électrode positive liée à la pluralité de parties de fil de languette d'électrode positive, dans les parties de fil de languette d'électrode positive, des collecteurs de courant d'électrode positive constituant l'extension des électrodes positives depuis le stratifié, les parties de fil de languette d'électrode positive et les collecteurs de courant d'électrode positive incluant une couche de résine et des couches d'aluminium formées sur les deux côtés de la couche de résine, dans le motif 2θ de mesure de diffraction des rayons X des couches d'aluminium, il y a au moins un pic A compris entre 38,0° et 39,0° inclus, le rapport (B/A) entre l'intensité d'un pic B compris entre 44,0° et 45,0° inclus et l'intensité du pic A est de 0,4 ou moins, et la largeur à mi-hauteur du pic A est de 0,4° ou moins.
PCT/JP2023/047091 2023-12-27 2023-12-27 Batterie secondaire au lithium Pending WO2025141819A1 (fr)

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JP2020107496A (ja) * 2018-12-27 2020-07-09 三洋電機株式会社 二次電池
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JP2013079419A (ja) * 2011-10-03 2013-05-02 Jx Nippon Mining & Metals Corp 銅箔及びそれを用いたリチウムイオン二次電池用負極集電体及び負極材、ならびにリチウムイオン二次電池
JP2016225020A (ja) * 2015-05-27 2016-12-28 株式会社デンソー 非水電解質二次電池用正極及び非水電解質二次電池
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WO2023166633A1 (fr) * 2022-03-02 2023-09-07 Tdk株式会社 Collecteur de courant, électrode pour dispositif de stockage d'énergie et batterie secondaire au lithium-ion

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