WO2022176379A1 - リチウムイオン二次電池用負極スラリー、リチウムイオン二次電池用負極の製造方法、リチウムイオン二次電池の製造方法、リチウムイオン二次電池用負極及びリチウムイオン二次電池 - Google Patents

リチウムイオン二次電池用負極スラリー、リチウムイオン二次電池用負極の製造方法、リチウムイオン二次電池の製造方法、リチウムイオン二次電池用負極及びリチウムイオン二次電池 Download PDF

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WO2022176379A1
WO2022176379A1 PCT/JP2021/047348 JP2021047348W WO2022176379A1 WO 2022176379 A1 WO2022176379 A1 WO 2022176379A1 JP 2021047348 W JP2021047348 W JP 2021047348W WO 2022176379 A1 WO2022176379 A1 WO 2022176379A1
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Prior art keywords
negative electrode
ion secondary
lithium ion
secondary battery
slurry
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Ceased
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PCT/JP2021/047348
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English (en)
French (fr)
Japanese (ja)
Inventor
慧 古味
幸穂 奥野
充 岩井
修司 堤
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to US18/276,343 priority Critical patent/US20240145718A1/en
Priority to EP21926802.6A priority patent/EP4297125A4/en
Priority to CN202180093338.4A priority patent/CN116868364A/zh
Priority to JP2023500584A priority patent/JPWO2022176379A1/ja
Publication of WO2022176379A1 publication Critical patent/WO2022176379A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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

Definitions

  • the present disclosure relates to a lithium ion secondary battery negative electrode slurry, a lithium ion secondary battery negative electrode manufacturing method, a lithium ion secondary battery manufacturing method, a lithium ion secondary battery negative electrode, and a lithium ion secondary battery.
  • the negative electrode active material settles during the storage process of the slurry or the manufacturing process of the negative electrode. is coated on the negative electrode current collector, uneven coating may occur and the battery performance may deteriorate.
  • a negative electrode slurry for a lithium ion secondary battery includes a negative electrode active material, a thickener, a preservative component, and a solvent, and the thickener includes carboxymethyl cellulose or a salt thereof,
  • the solvent contains water, and the antiseptic component has the following compositional formula (1) (wherein R1 and R2 are each independently a hydrogen atom or a hydrocarbon group which may have a substituent).
  • a method for manufacturing a negative electrode for a lithium ion secondary battery according to one aspect of the present disclosure is characterized by including a step of applying a negative electrode slurry for a lithium ion secondary battery onto a negative electrode current collector.
  • a method for manufacturing a lithium ion secondary battery according to an aspect of the present disclosure is characterized by using the negative electrode for a lithium ion secondary battery obtained by the method for manufacturing a negative electrode for a lithium ion secondary battery.
  • a negative electrode for a lithium ion secondary battery has a negative electrode mixture layer containing a negative electrode active material, a thickener, and a preservative component, and the thickener is carboxymethyl cellulose or a salt thereof.
  • the antiseptic component has the following compositional formula (1) (wherein R1 and R2 are each independently a hydrogen atom or a hydrocarbon group which may have a substituent).
  • a lithium ion secondary battery according to an aspect of the present disclosure includes the negative electrode for a nonaqueous electrolyte secondary battery.
  • the negative electrode slurry for a lithium ion secondary battery according to one aspect of the present disclosure, it is possible to suppress a decrease in viscosity over time.
  • FIG. 1 is a cross-sectional view of a lithium-ion secondary battery that is an example of an embodiment
  • FIG. FIG. 2 is a graph showing changes over time in viscosity of negative electrode slurries of Examples 1 to 4 and Comparative Example.
  • FIG. 4 is a graph showing temporal changes in the viscosity retention rate of negative electrode slurries of Examples 1 to 4 and Comparative Example.
  • the negative electrode slurry for lithium ion secondary batteries according to the present embodiment contains a negative electrode active material, a thickener, an antiseptic component, and a solvent.
  • the negative electrode active material is not particularly limited as long as it is a material that can be used as a negative electrode active material for conventional lithium ion secondary batteries.
  • Carbon materials, metals and alloys such as Li, Si, and Sn, and metal compounds such as metal oxides, metal sulfides, and metal nitrides can be used.
  • alloys include Li-containing alloys such as lithium-aluminum alloys, lithium-tin alloys, lithium-lead alloys, and lithium-silicon alloys.
  • metal oxides include lithium titanate (Li 4 Ti 5 O 12 etc.), cobalt oxide, iron oxide and the like.
  • metal nitrides include lithium-containing nitrides such as lithium cobalt nitride, lithium iron nitride, and lithium manganese nitride.
  • sulfur-based compounds can also be exemplified.
  • the thickener is used to adjust the negative electrode slurry to an appropriate viscosity range, and contains carboxymethyl cellulose or a salt thereof (hereinafter sometimes referred to as CMC or CMC salt).
  • the thickener may contain either CMC or CMC salt, or may contain both.
  • CMC salts include ammonium salts, sodium salts, potassium salts, lithium salts and the like.
  • the negative electrode slurry of the present embodiment may contain conventionally known thickeners such as polyethylene glycol and polyethylene oxide together with CMC or CMC salt.
  • the content of CMC or CMC salt may be, for example, in the range of 0.5% by mass to 3% by mass with respect to the total amount of the negative electrode slurry.
  • the solvent contains water.
  • the solvent preferably consists of only water from the viewpoint of ease of recovery during drying, environmental compatibility, and the like, but may contain a water-soluble organic solvent such as alcohol.
  • Water is not particularly limited, such as ultrapure water, pure water, industrial water, etc. However, when selecting a grade that is not restricted by treatment cost or usage amount, it is common to use Japanese Industrial Standard A1 class.
  • the antiseptic component contains a cyclic hydroxamic acid ethanolamine salt represented by the following compositional formula (1).
  • R1 and R2 are each independently a hydrogen atom or a hydrocarbon group which may have a substituent.
  • the hydrocarbon group optionally having a substituent for R1 in the formula includes, for example, a linear or branched alkyl group or alkenyl group, a linear or branched cycloalkyl group or an aryl group, or an alkylalkylene oxide group (the alkyl moiety and alkylene moiety in the group may be linear or branched), and the like.
  • the number of carbon atoms in the optionally substituted hydrocarbon group of R1 may be, for example, 1 or more, 3 or more, or 6 or more, and may be 30 or less, 20 or less, or 8 or less.
  • the hydrocarbon group which may have a substituent for R2 in the formula includes, for example, a linear or branched alkyl group, typically an alkenyl group, a linear or branched cycloalkyl group, a phenyl group, or a benzyl group and the like.
  • the carbon number of the hydrocarbon group which may have a substituent of R2 may be, for example, 1 or more, and may be 6 or less, or 4 or less.
  • a specific example of R2 may be a methyl group.
  • cyclic hydroxamic acid ethanolamine salts include piroctone olamine (1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2 represented by the following compositional formula (1A) (1H)-pyridoneethanolamine salt), ciclopirox olamine represented by the following compositional formula (1B) (6-cyclohexyl-1-hydroxy-4-methyl-2(1H)-pyridoneethanolamine salt), and the like. mentioned. Any one of these may be used, or two of them may be used in combination.
  • the negative electrode slurry of the present embodiment can suppress the growth of microorganisms such as bacteria or kill microorganisms due to the cyclic hydroxamic acid ethanolamine salt represented by the above composition formula (1). , the decrease in the viscosity of the negative electrode slurry over time can be suppressed.
  • the content of the ethanolamine cyclic hydroxamate is preferably 0.025% by mass or more with respect to the total amount of the negative electrode slurry, in order to effectively suppress the decrease in the viscosity of the negative electrode slurry over time.
  • the upper limit is not particularly limited, for example, the content of ethanolamine cyclic hydroxamate may be 1% by mass or less with respect to the total amount of the negative electrode slurry.
  • the negative electrode slurry of the present embodiment may contain additives such as binders in addition to the negative electrode active material, thickener, antiseptic component and solvent.
  • binders that can be used include polyethylene, polypropylene, fluorine-based binders, rubber particles, acrylic polymers, and vinyl polymers.
  • fluorine-based binders include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and vinylidene fluoride-hexafluoropropylene copolymer. be done.
  • Rubber particles include acrylic rubber particles, styrene-butadiene rubber (SBR) particles, acrylonitrile rubber particles, and the like.
  • the viscosity of the negative electrode slurry may be 2000 mPa ⁇ s or more, or 5000 mPa ⁇ s or more. Also, if the viscosity of the negative electrode slurry is too high, it will be difficult to apply it uniformly to the required thickness.
  • the viscosity of the negative electrode slurry is a value measured using a BM rotary viscometer in a 25° C. environment at a rotation speed of 20 rpm after 1 minute of rotor rotation.
  • the negative electrode slurry can be prepared by dispersing it in.
  • the dispersing apparatus include media type dispersing machines such as bead mills, ball mills, planetary ball mills, kneaders, planetary mixers and disper mixers, and medialess dispersing machines such as homogenizers.
  • a conventional method can be employed to produce a negative electrode using the negative electrode slurry of the present embodiment.
  • the negative electrode can be obtained by applying the negative electrode slurry of the present embodiment to a negative electrode current collector, drying it to form a negative electrode mixture layer, and further rolling it as necessary.
  • the negative electrode mixture layer may be formed on both sides in the thickness direction of the negative electrode current collector.
  • the thickness of the negative electrode mixture layer is, for example, 20 to 150 ⁇ m when formed on one side of the negative electrode current collector, and is, for example, 50 to 250 ⁇ m in total when formed on both sides of the negative electrode current collector. .
  • the negative electrode current collector those commonly used in the field of lithium ion secondary batteries can be used, for example, sheets and foils containing copper, nickel, and noble metals.
  • the sheet may be porous. Porous bodies include, for example, foams, woven fabrics, non-woven fabrics, and the like.
  • the thickness of the sheet and foil is not particularly limited, but is, for example, 1-100 ⁇ m.
  • the negative electrode slurry can be applied to the surface of the negative electrode current collector using, for example, a slit die coater, reverse roll coater, lip coater, blade coater, knife coater, gravure coater, and dip coater.
  • the negative electrode slurry applied to the negative electrode current collector may be dried in a manner similar to natural drying, but in consideration of productivity, it is desirable to dry at a temperature of 100° C. to 200° C. for 10 minutes to 1 hour.
  • the negative electrode mixture layer is formed by heating and drying the negative electrode slurry, a thermally denatured product produced by thermally denaturing the cyclic hydroxamic acid ethanolamine salt in the negative electrode slurry is detected in the negative electrode mixture layer.
  • a thermally denatured product produced by thermally denaturing the cyclic hydroxamic acid ethanolamine salt in the negative electrode slurry is detected in the negative electrode mixture layer.
  • the negative electrode mixture layer contains, in addition to piroctone olamine, thermally denatured substances represented by the following formulas (2) to (4). may be detected.
  • Rolling is performed several times at a predetermined linear pressure, for example, by a roll press until the negative electrode reaches a predetermined thickness.
  • the content of the ethanolamine cyclic hydroxamate is preferably 0.05% by mass or more with respect to the total amount of the negative electrode mixture layer.
  • the lithium ion secondary battery of this embodiment can have the same configuration as a conventional lithium ion secondary battery, except that the negative electrode prepared using the negative electrode slurry of this embodiment is used.
  • FIG. 1 is a cross-sectional view of a lithium-ion secondary battery that is an example of an embodiment.
  • a lithium-ion secondary battery 10 shown in FIG. It includes insulating plates 18 and 19 and a battery case 15 that accommodates the above members.
  • the battery case 15 is composed of a bottomed cylindrical case body 16 and a sealing member 17 that closes the opening of the case body 16 .
  • the wound electrode body 14 instead of the wound electrode body 14, another form of electrode body such as a stacked electrode body in which positive and negative electrodes are alternately stacked via a separator may be applied.
  • Examples of the battery case 15 include cylindrical, rectangular, coin-shaped, button-shaped metal cases, and resin cases formed by laminating resin sheets (laminated batteries).
  • the case body 16 is, for example, a bottomed cylindrical metal container.
  • a gasket 28 is provided between the case body 16 and the sealing member 17 to ensure hermeticity inside the battery.
  • the case main body 16 has an overhanging portion 22 that supports the sealing member 17, for example, a portion of the side surface overhanging inward.
  • the projecting portion 22 is preferably annularly formed along the circumferential direction of the case body 16 and supports the sealing member 17 on the upper surface thereof.
  • the sealing body 17 has a structure in which a filter 23, a lower valve body 24, an insulating member 25, an upper valve body 26, and a cap 27 are layered in order from the electrode body 14 side.
  • Each member constituting the sealing member 17 has, for example, a disk shape or a ring shape, and each member other than the insulating member 25 is electrically connected to each other.
  • the lower valve body 24 and the upper valve body 26 are connected to each other at their central portions, and an insulating member 25 is interposed between their peripheral edge portions.
  • the lower valve body 24 deforms and breaks so as to push the upper valve body 26 upward toward the cap 27 side, breaking the lower valve body 24 and the upper valve body 26 .
  • the current path between is interrupted.
  • the upper valve body 26 is broken and the gas is discharged from the opening of the cap 27 .
  • the positive electrode lead 20 attached to the positive electrode 11 extends through the through hole of the insulating plate 18 toward the sealing member 17, and the negative electrode lead 21 attached to the negative electrode 12 extends through the insulating plate. It extends to the bottom side of the case body 16 through the outside of the case body 19 .
  • the positive electrode lead 20 is connected to the lower surface of the filter 23, which is the bottom plate of the sealing member 17, by welding or the like, and the cap 27, which is the top plate of the sealing member 17 electrically connected to the filter 23, serves as a positive electrode terminal.
  • the negative lead 21 is connected to the inner surface of the bottom of the case body 16 by welding or the like, and the case body 16 serves as a negative terminal.
  • the positive electrode 11, the negative electrode 12, the separator 13, and the electrolyte are described in detail below.
  • the negative electrode 12 is a negative electrode obtained by the negative electrode slurry manufacturing method of the present embodiment.
  • the structure of the negative electrode 12 is as described above, and the description thereof is omitted here.
  • the positive electrode 11 is produced, for example, by applying a positive electrode slurry on one or both sides of a positive electrode current collector, drying it, and rolling it to form a positive electrode mixture layer.
  • a positive electrode current collector one commonly used in the field of lithium ion secondary batteries can be used, and examples thereof include sheets and foils containing stainless steel, aluminum, aluminum alloys, titanium, and the like.
  • the sheet may be porous. Porous bodies include, for example, foams, woven fabrics, non-woven fabrics, and the like.
  • the thickness of the sheet and foil is not particularly limited, but is, for example, 1-500 ⁇ m.
  • the positive electrode slurry can contain conventionally known positive electrode active materials, conductive materials, binders, thickeners, dispersion media, and the like.
  • positive electrode active materials include olivine-type lithium salts such as LiFePO 4 , chalcogen compounds such as titanium disulfide and molybdenum disulfide, manganese dioxide, and conventional lithium-containing composite metal oxides.
  • a conventional lithium-containing composite metal oxide is, for example, a metal oxide containing lithium and a transition metal or a metal oxide in which a part of the transition metal in the metal oxide is replaced with a different element.
  • heterogeneous elements include Na, Mg, Sc, Y, Mn, Fe, Co, Ni, Cu, Zn, Al, Cr, Pb, Sb, B, etc. Mn, Al, Co, Ni, Mg, etc. are preferred.
  • the dissimilar element may be one kind or two or more kinds.
  • Examples of conductive materials include carbon black, graphite, carbon fibers, and metal fibers.
  • Examples of carbon black include acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black.
  • a conductive material can be used individually by 1 type or in combination of 2 or more types.
  • binder can be used as long as it can be dissolved or dispersed in the dispersion medium.
  • polyethylene, polypropylene, fluorine-based binders, rubber particles, acrylic polymers, vinyl polymers, and the like can be used.
  • fluorine-based binders include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and vinylidene fluoride-hexafluoropropylene copolymer. be done.
  • a binder can be used individually by 1 type or in combination of 2 or more types.
  • the thickener one commonly used in this field can be used, and examples thereof include carboxymethyl cellulose or salts thereof.
  • the dispersion medium includes, for example, N,N-dimethylformamide, dimethylacetamide, methylformamide, hexamethylsulfolamide, amides such as tetramethylurea, N-methyl-2-pyrrolidone (NMP), amines such as dimethylamine. , methyl ethyl ketone, acetone, and cyclohexanone, ethers such as tetrahydrofuran, and sulfoxides such as dimethyl sulfoxide.
  • a method commonly used in this field can be used to prepare the positive electrode slurry. For example, there is a method of mixing each of the above components using a mixing device such as a planetary mixer, disper mixer, pin mixer, kneader, homogenizer, or the like.
  • a mixing apparatus is used individually or in combination of 2 or more types.
  • the positive electrode slurry can be applied to the surface of the positive electrode current collector using, for example, a slit die coater, reverse roll coater, lip coater, blade coater, knife coater, gravure coater, and dip coater.
  • the positive electrode mixture paste applied to the positive electrode current collector is preferably dried close to natural drying, but in consideration of productivity, it is preferably dried at a temperature of 70° C. to 200° C. for 10 minutes to 5 hours. .
  • Rolling is performed several times with a predetermined linear pressure using a roll press until the positive electrode 11 reaches a predetermined thickness.
  • the positive electrode 11 is obtained by cutting and processing.
  • a microporous film made of a polymer material is used.
  • Polymer materials include, for example, polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene chloride, polyacrylonitrile, polyacrylamide, polytetrafluoroethylene, polysulfone, polyethersulfone, polycarbonate, polyamide, polyimide, polyether (polyethylene oxide and polypropylene oxide), cellulose (carboxymethyl cellulose and hydroxypropyl cellulose), poly(meth)acrylic acid, and poly(meth)acrylic acid ester.
  • These polymer materials can be used singly or in combination of two or more.
  • a multilayer film obtained by stacking these microporous films can also be used.
  • the thickness of the microporous film is, for example, 15 ⁇ m to 30 ⁇ m.
  • the electrolyte includes, for example, a non-aqueous solvent and an electrolyte salt.
  • the electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • non-aqueous solvents examples include cyclic carbonates and chain carbonates.
  • Cyclic carbonates include, for example, ethylene carbonate, propylene carbonate, butylene carbonate, and the like.
  • dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, etc. are mentioned as chain
  • electrolyte salts examples include LiPF6 , LiBF4 , LiClO4, LiAsF6 , LiCF3SO3 , LiN ( SO2CF3 ) 2 , LiN ( SO2C2F5 ) 2 , and LiC ( SO2CF 3 ) 3 etc. are mentioned. These electrolyte salts may be used alone or in combination of two or more.
  • Example 1 To 50% by mass of water, 49.575% by mass of graphite powder as a negative electrode active material, 0.4% by mass of carboxymethylcellulose sodium as a thickening agent, and 0.025% by mass of piroctone olamine are added. was stirred with a planetary mixer for 1 hour to obtain a negative electrode slurry. To this negative electrode slurry was added 1% by mass of a bacterial solution in which bacteria generating an enzyme that decomposes CMC was propagated.
  • the negative electrode slurry after adding the fungus solution is placed in a container with an inner diameter of 55 mm and a depth of 115 mm, and a BM rotary viscometer [manufactured by Toki Sangyo Co., Ltd.] while maintaining the temperature at 25 ⁇ 0.2 ° C. "TVB-15M (trade name)"] was used to confirm the change in viscosity of the negative electrode slurry over time.
  • Example 2 A negative electrode slurry was obtained in the same manner as in Example 1, except that piroctone olamine was changed to ciclopirox olamine. Then, in the same manner as in Example 1, the change in viscosity of the obtained negative electrode slurry over time was confirmed.
  • Example 3 Same as Example 1, except that the amount of piroctone olamine added was changed from 0.025% by mass to 0.01% by mass, and the amount of graphite powder was changed from 49.575% by mass to 49.59% by mass. to obtain a negative electrode slurry. Then, in the same manner as in Example 1, the change in viscosity of the obtained negative electrode slurry over time was confirmed.
  • Example 4 A negative electrode slurry was obtained in the same manner as in Example 3, except that piroctone olamine was changed to ciclopirox olamine. Then, in the same manner as in Example 1, the change in viscosity of the obtained negative electrode slurry over time was confirmed.
  • Example 2 A negative electrode slurry was obtained in the same manner as in Example 1, except that piroctone olamine was not added. Then, in the same manner as in Example 1, the change in viscosity of the obtained negative electrode slurry over time was confirmed.
  • FIG. 2 is a graph showing changes over time in the viscosity of negative electrode slurries of Examples 1 to 4 and Comparative Example
  • FIG. 3 is a graph showing changes over time in the viscosity retention rate of negative electrode slurries of Examples 1 to 4 and Comparative Example. is.
  • lithium ion secondary battery 11 positive electrode, 12 negative electrode, 13 separator, 14 electrode body, 15 battery case, 16 case main body, 17 sealing body, 18, 19 insulating plate, 20 positive electrode lead, 21 negative electrode lead, 22 projecting portion, 23 filter, 24 lower valve body, 25 insulating member, 26 upper valve body, 27 cap, 28 gasket.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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PCT/JP2021/047348 2021-02-18 2021-12-21 リチウムイオン二次電池用負極スラリー、リチウムイオン二次電池用負極の製造方法、リチウムイオン二次電池の製造方法、リチウムイオン二次電池用負極及びリチウムイオン二次電池 Ceased WO2022176379A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US18/276,343 US20240145718A1 (en) 2021-02-18 2021-12-21 Negative electrode slurry for lithium ion secondary battery, method for manufacturing negative electrode for lithium ion secondary battery, method for manufacturing lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
EP21926802.6A EP4297125A4 (en) 2021-02-18 2021-12-21 NEGATIVE ELECTRODE SUSPENSION FOR LITHIUM ION SECONDARY BATTERY, METHOD FOR MANUFACTURING NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, METHOD FOR MANUFACTURING LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY
CN202180093338.4A CN116868364A (zh) 2021-02-18 2021-12-21 锂离子二次电池用负极浆料、锂离子二次电池用负极的制造方法、锂离子二次电池的制造方法、锂离子二次电池用负极和锂离子二次电池
JP2023500584A JPWO2022176379A1 (https=) 2021-02-18 2021-12-21

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JP2021-024407 2021-02-18

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