WO1998054769A1 - Procede de production d'une electrode pour cellules electrolytiques non-aqueuses - Google Patents

Procede de production d'une electrode pour cellules electrolytiques non-aqueuses Download PDF

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Publication number
WO1998054769A1
WO1998054769A1 PCT/JP1998/002312 JP9802312W WO9854769A1 WO 1998054769 A1 WO1998054769 A1 WO 1998054769A1 JP 9802312 W JP9802312 W JP 9802312W WO 9854769 A1 WO9854769 A1 WO 9854769A1
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Prior art keywords
electrode
active material
graphite
weight
parts
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PCT/JP1998/002312
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English (en)
Japanese (ja)
Inventor
Tadayoshi Iijima
Shigeo Kurose
Tetsuya Takahashi
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Tdk Corporation
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Publication date
Application filed by Tdk Corporation filed Critical Tdk Corporation
Priority to AU74517/98A priority Critical patent/AU7451798A/en
Priority to KR10-1999-7010919A priority patent/KR100502530B1/ko
Publication of WO1998054769A1 publication Critical patent/WO1998054769A1/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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • 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
    • H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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 invention relates to a method for manufacturing an electrode for a non-aqueous electrolyte battery, and a non-aqueous electrolyte battery in which an electrode active material layer comprising an active material, a scale-like graphite, and a binder is coated on a current collector
  • the present invention relates to a method for manufacturing an electrode for use.
  • the electrodes of this battery are manufactured by coating the active material with a binder, forming an active material layer coating on a current collector, and drying.
  • the active material used for the electrode has poor electrical conductivity except for a part, and therefore, a conductive material is used.
  • the role of the conductive material in the electrode is important, and if the conductive material does not work effectively, problems such as a decrease in battery capacity and a deterioration in cycle life will occur.
  • lithium ion secondary battery for example, when carbon is used as the active material in the negative electrode, when lithium enters the active material and expands and contracts, it contracts. In a lithium-ion secondary battery, charge and discharge are repeated, and the active material expands and contracts repeatedly. During contraction, the contact between the active material and the conductive material deteriorates, which gradually deteriorates the battery.
  • a carbon black such as acetylene black is used as a conductive material.
  • a ⁇ a negative electrode using an alkali metal as an active material, a non-aqueous electrolyte, and a positive electrode are provided.
  • a method for producing a related battery electrode for example, a polyacene-based skeleton structure which is a heat-treated phenolic resin and has an atomic ratio of hydrogen atoms to Z carbon atoms of 0.5 to 0.05 is used.
  • a method for producing a battery electrode comprising an insoluble and infusible substrate having a specific surface area value of at least 600 m 2 Zg by a BET method, wherein the powder of the insoluble and infusible substrate is a conductive material and a binder.
  • a method for producing an electrode for a battery comprising: forming the mixture under pressure or applying or applying pressure on a support. ”(Japanese Patent Application Laid-Open No. 63-310146) No.).
  • the current collector of the coating film is used due to the large surface area of the acetylene black.
  • the adhesiveness to the electrode was poor and the film was easily peeled off, or the coating film was too hard, the flexibility was poor, and the electrode was easily broken.
  • the particle size of the conductive material is reduced, but the cycle life is poor when graphite particles having a small particle size are used.
  • the present invention has been made in view of the above problems, and provides an electrode for a non-aqueous electrolyte battery having good charge / discharge characteristics such as discharge capacity and charge / discharge cycle life and improved physical characteristics. Disclosure of the invention
  • the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result of producing an electrode for a non-aqueous electrolyte battery using an active material and a flake-like graphite, using the active material, By mixing and pulverizing the iron, the above-mentioned problems were solved, and the object was achieved. That is, the present invention relates to a method for producing an electrode for a non-aqueous electrolyte battery, in which (1) an electrode active material layer comprising an active material, a scale-like graphite, and a binder is coated on a current collector.
  • the active material is a positive electrode active material.
  • An object of the present invention is to provide an electrode for a non-aqueous electrolyte battery having improved charge / discharge characteristics such as discharge capacity and charge / discharge cycle life and physical properties of a coating film.
  • a conductive material is used because the electric conductivity of the active material is poor.
  • the larger the amount of conductive material the more active material
  • the amount of active material in the volume will decrease and the capacity of the battery will decrease. For this reason, efforts are being made to reduce the amount of conductive material while extracting the performance of active materials.
  • non-aqueous electrolyte secondary batteries decreases with each use, and deterioration occurs.
  • one of the causes of deterioration of non-aqueous electrolyte secondary batteries is the contact between the active material in the electrode and the conductive material. It is considered that the battery is deteriorated and the electricity cannot be extracted to the outside, resulting in deterioration of the battery.
  • carbon black such as acetylene black or graphite is used as the conductive material.Acetylene black has a large specific surface area, but if the active material is carbon, the contact with carbon is considered to be not so good. I have.
  • acetylene black is easy to take an aggregated form, and therefore, although the specific surface area is large, the ratio of the area where the surface of acetylene black is in contact with the active material to the surface area of acetylene black as a whole is not large. If the amount of acetylene black is reduced for the purpose of improving the physical properties of the electrode, the effect as a conductive material is reduced.
  • JP-A-1 one 1 0 5 4 5 wherein as the 9 discloses, describes a non-aqueous electrolyte secondary battery using L i M n 2 0 4 and Graph eye DOO, grapher I bets weight Although 8 to 22% by weight is said to be good, it means that the effect as a conductive material is not exhibited unless a certain amount is added. This is probably because the specific surface area of the conductive material is small, and unless the amount is increased, the contact surface between the conductive material and the active material does not increase.
  • the conductive material used in the present invention is a scale-shaped graphite.
  • a graphite is a natural graphite or an artificial graphite, and its shape is like a scale.
  • the scaly shape in the present invention refers to a shape in which thin layers such as a scaly shape, a scaly shape, a flaky shape, a laminar shape, and a mica shape are laminated.
  • the shape of the natural graphite varies depending on the place of production, but it may be such that the shape is changed to the scale-like shape referred to in the present invention by post-processing such as pulverization and classification. It is preferable that the artificial graphite exhibit the flake shape immediately after the synthesis, but it may be formed into a flake shape by post-processing such as pulverization and classification, similarly to natural graphite. Among these graphites, the classified graphite is most preferable because the scale-like structure is uniform.
  • Graphites that exhibit such scaly shapes include the LF series of Chuetsu Graphite Works, the UFG series of Showa Denko KK, the KS series of LONZA, and the MICROCARB of Kansai Thermochemical Co., Ltd. -G series, Ecos carbon series of Ecos Giken Co., Ltd., scaly Daraite, scaly graphite, etc. which are produced naturally.
  • the center particle size of the graphite is preferably from 1 to 100 ⁇ m, more preferably from 4 to 50 m.
  • L i x M y 0 2 is typically a lithium-containing metal oxide represented by the formula, or similar metal sulfide or the like.
  • L i C o 0 2, L i N i X C ox 0 2, L i ⁇ ⁇ 2 0 4 and the like are preferable.
  • the center particle diameter is preferably from 1 to 30 ⁇ m, more preferably from 7 to 20 m.
  • Examples of the negative electrode active material that can be used in the present invention include amorphous carbon, petroleum coke, coal coke, vapor-grown carbon fiber, non-graphitizable carbon, polymer carbon, and tin oxide.
  • Non-graphitizable carbon and polymer carbon having high hardness are preferred.
  • Polymer carbon refers to a carbon material obtained by heat-treating a high polymer having a crosslinked structure in an inert atmosphere, and is obtained by carbonization of cellulose, phenolic resin, furfural resin, polyparaphenylene, polyatalilonitrile, and the like.
  • the center particle diameter of the negative electrode active material is preferably from 1 to 30 x m, more preferably from 4 to 15 m.
  • the present invention is characterized in that the effect is exhibited with a small amount even with a graphite having a large particle size. Since the graphite is cleaved, even if it is cleaved even with a large grain size, the grain size hardly decreases even if the specific surface area increases. However, the graphites are stacky, and if you try to loosen the stacked ones and give them poor shearing force, you can easily stack them. For example, if you try to grind graphite with a ball mill or the like, it will be crushed, but the stack will be slow.
  • the stack is measured as a surface in the measurement gas, but the surface is not used effectively in terms of contact with the active material.
  • the surfaces stick together and cannot be measured even with the measurement gas. At this point, it is difficult to grind the graphite, and if you try to grind it so that it does not stack, the particle size will decrease.
  • the regrapher is prepared by mixing and grinding the active material and graphite.
  • the purpose is to create an effective surface that can come into contact with the active material, while keeping the particle size as small as possible.
  • Mixing and crushing graphite with the active material of the present invention means that the active material acts on the graphite to crush the graphite and to remove the stack or the stack. Further, when the central particle size of the graphite is larger than the central particle size of the active material, a more excellent effect is exhibited.
  • the central particle size of the graphite is more preferably at least twice the central particle size of the active material.
  • the amount of the conductive material varies depending on the specific surface area of the active material and the like, but is preferably 0.1 to 15 wt%, more preferably 2 to 10 wt% in the coating film.
  • the central particle diameter in the present invention is a cumulative percentage diameter having a frequency accumulation of 50%, as measured using a laser particle size analyzer such as a Microtrack manufactured by Nikkiso Co., Ltd.
  • the mixing and pulverization includes dry pulverization using Hogkawa Micron's Ongmill or the like and wet pulverization using a kneading apparatus.
  • the method of kneading using a kneading device is relatively simple and can grind graphite strongly.
  • the scale-like graphite has low hardness and lubricity, and the active material has relatively high hardness.
  • the scaly graphite is pulverized so that it can be peeled off at the crystal plane.
  • the use of Daraite for the negative electrode acts both as a conductive material and as an active material, which is advantageous in terms of capacity.
  • the active material When dry milling is carried out, the active material is first set in a proportion as high as possible with respect to the total amount of conductive material consisting of flake-like graphite, and this is mixed into an angmill-diet mill. The impact and shear are applied to the graphite from the active material to remove the graphite stack and / or crush. Afterwards, to achieve the desired final compounding ratio Insufficient materials are added, and if necessary, dispersion is performed with a stirring mixer such as a hypermixer, dissolver, or sand grinder mill, and final adjustment is performed so that the electrode active material layer paint meets the conditions of the applicator.
  • a stirring mixer such as a hypermixer, dissolver, or sand grinder mill
  • the active material When wet mixing and pulverizing, first, the active material is mixed in a ratio as high as possible with respect to the total amount of conductive material consisting of flake-like graphite, and then the binder solution and binder are added. Add the agent or solvent and knead using a kneader. After that, add the insufficient material to achieve the desired final compounding ratio, and if necessary, disperse it with a stirring mixer such as a hyper mixer, dissolver, or sand grinder mill, and apply the electrode active material layer paint. Make final adjustments to meet machine requirements.
  • a stirring mixer such as a hyper mixer, dissolver, or sand grinder mill
  • the mixing ratio of the conductive material and the active material is 0.1 to 40 parts by weight, preferably 2 to 15 parts by weight.
  • the above-mentioned kneading machine refers to a device that applies shear between a rotary blade and a kneading tank, which is called a kneader (kneading machine), and can be either a single processing type or a continuous processing type.
  • the single processing type include an open type edder and a pressurized eder.
  • the open type is not suitable for achieving the object of the present invention because the upper part is open, so that a gap is generated, and the pressurized type can minimize the air gap, so that the efficiency is the highest. The effect of the present invention can be obtained well.
  • a continuous processing type kneader if used, there will be a slight gap as compared with the pressurized type because of the feed-out (feed) structure. Being able to be continuous including post-treatment such as dilution and dissolution Is preferred.
  • Specific examples of the rotating blade used for such a kneader include a ⁇ type, a Z type, a cam type, a roller type, an S type, a fish tail type, and a Banbury type.
  • these kneaders include stand-alone kneaders such as the MS-type pressurized kneader of Moriyama Seisakusho, KRC kneader of Kurimoto Steel Works, Fuji Boudanenel, Kobe Works, and extruders such as Toshiba Machinery. Continuous kneaders, desk-type kneaders manufactured by Irie Shokai Co., Ltd., kneaders manufactured by Takabayashi Rika Co., Ltd., and small-sized machines such as Laboplastomill and Brabender manufactured by Toyo Seiki Co., Ltd.
  • Other devices having a function similar to a kneader include a two-roll mill and a Banbury mixer.
  • a thermoplastic resin or a polymer having rubber elasticity can be used singly or as a mixture.
  • the binder include a fluorinated polymer, a polybutyl alcohol, and a carboxymethino. Resenolerose, hydroxypropinoresenorelose, regenerated cenorellose diacetyl cellulose, polyvinyl chloride, polybutylpyrrolidone, polyethylene, polypropylene, EPDM, sulfonated EPDM, SBR, polybutadiene, polyethylene oxide, etc. .
  • the fluorine-containing polymer preferably has an atomic ratio of fluorine atom to carbon atom of 0.75 or more and 1.5 or less, more preferably 0.75 or more and 1.3 or less. When this value is larger than 1.5, the battery capacity cannot be sufficiently obtained, and when it is smaller than 0.75, the binder dissolves in the electrolytic solution.
  • fluorinated polymers include polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride monotrifluoride copolymer, ethylene-tetrafluoroethylene copolymer, and propylene-tetrafluoroethylene copolymer.
  • a fluorine-containing polymer in which main-chain hydrogen is substituted with an alkyl group are fluorine-containing polymer in which main-chain hydrogen is substituted with an alkyl group.
  • the solvent has low solubility in the electrolytic solution and there is a solvent that can be dissolved.
  • the solvent has low solubility in the electrolytic solution and there is a solvent that can be dissolved.
  • vinylidene fluoride-based polymer it is soluble in the carbonate-based solvent used in the electrolytic solution. Although difficult, it can be dissolved in solvents such as N, N-dimethylformamide and N-methylpyrrolidone.
  • the amount of such a binder varies depending on the specific surface area of the active material and the conductive material, the particle size, the strength of the target electrode, and the like, but is preferably 2 to 20 wt% in the coating film, and 3 to 15 wt%. wt% is more preferred.
  • a general organic solvent can be used, and specifically, saturated hydrocarbons such as hexane and aromatics such as toluene and xylene. Hydrocarbons, alcohols such as methanol, ethanol, propanol and butanol, ketones such as acetone, methylethylketone, methylisobutylketone and diisobutylketone, esters such as ethylacetate and butylacetate, tetrahydrofuran, dioxane, Ethers such as acetyl ether, N, N-dimethylformamide, N-methylpyrrolidone, N, N-amides such as dimethylacetamide, halogenated hydrocarbons such as ethylene chloride and chlorobenzene, etc.
  • amide-based solvents include fluorine-containing solvents. These solvents are preferable because they can dissolve the polymer, and these solvents can be used alone or
  • the current collector having such an electrode active material composition may be any current collector that does not cause a chemical change in the configured battery.
  • Examples thereof include aluminum, copper, stainless steel, nickel, titanium, and fired. Carbon or the like can be used, and those surfaces may be treated with carbon, nickel, titanium, or silver, but aluminum is particularly preferred in consideration of oxidation resistance, electrode flexibility and cost, and the like. Foil or copper foil is preferred.
  • Electrode active material composition by generally well-known coating methods such as the lade method, knife method, ethus extrusion method, curtain method, gravure method, bar coat method, dip method, kiss coat method and squeeze method
  • the paint is applied.Etrus extrusion method is particularly preferable.By selecting the solvent composition and drying conditions of the paint so that the paint is applied at a speed of 5 to 100 m / min, good
  • the surface condition of the coating layer can be obtained.
  • the thickness, length and width of the coating layer are determined by the size of the final battery, but it is preferable to adjust the thickness of the coating layer after coating by a commonly used press process.
  • the pressure is preferably 0.2 to 10 tZ cm, and the processing temperature is preferably 10 to 150 ° C.
  • FIG. 1 is a sectional view of a cell for measuring charge / discharge characteristics.
  • the symbols in the figure indicate the following.
  • the active material layer was produced as follows.
  • Active material layer paint composition Active material Non-graphitizable carbon: 80 Center particle size 4.2 ⁇ ⁇
  • 100 parts by weight of PVDF was dissolved in 90 parts by weight of NMP to prepare 100 parts by weight of a binder solution.
  • 80 parts by weight of non-graphitizable carbon and 10 parts by weight of a conductive material were dry-mixed with a hyper mixer, and the mixture was charged into a pressure kneader.
  • 50 parts by weight of the above binder solution was added to the mixture, and the mixture was kneaded for 60 minutes while the jacket of the pressure kneader was cooled with water to carry out mixing and grinding.
  • the kneaded material was removed, 50 parts by weight of a binder solution and 60 parts by weight of NMP were added, and dissolved with a hyper mixer to obtain an active material layer paint.
  • Example 2 Apply the finished paint to one side of the current collector of rolled copper foil with a blade coater 'Dry, then apply the same paint on the back side' After drying, press-mold with a roller press machine and cut to predetermined size Thus, an electrode of Example 1 was obtained. (Example 2)
  • Example 1 was repeated, except that the conductive material was changed to KS15 (Graphite, center particle size: 8 im, manufactured by LONZA).
  • Example 3 Example 1 was carried out in the same manner as in Example 1 except that the conductive material was changed to KS44 (Graphite having a center particle size of 17 ⁇ manufactured by LON ZA).
  • Example 4 Apply the finished paint to one side of the current collector of rolled copper foil with a blade coater.After drying, apply the same paint on the back side.After drying, press-mold with a roller press machine to a specified size. By cutting, the electrode of Example 3 was obtained. (Example 4)
  • Example 1 was carried out in the same manner as in Example 1 except that the conductive material of Example 1 was changed to scaly natural graphite (LF- 18A center particle size of 18 / m, made by Chuetsu Graphite).
  • scaly natural graphite LF- 18A center particle size of 18 / m, made by Chuetsu Graphite.
  • Example 5 Apply the finished paint to one side of the rolled copper foil current collector with a blade coater '' After drying, apply the same paint on the back side '' After drying, compression-mold with a roller press machine and cut to a predetermined size Thus, an electrode of Example 4 was obtained. (Example 5)
  • Example 1 was repeated except that the conductive material of Example 1 was changed to KS6 (Graphite core particle size of 3.8 ⁇ manufactured by LON ZA).
  • Example 1 was repeated, except that the conductive material was changed to acetylene black (DENKA BLACK manufactured by Denki Kagaku Kogyo).
  • Example 1 was carried out in the same manner as in Example 1 except that the conductive material was changed to vapor grown carbon fiber (VGCF manufactured by Showa Denko). Apply the finished paint to one side of the rolled copper foil current collector with a blade coater, dry it, apply the same paint to the back side, dry it, compress it with a roller press machine, and cut it to a predetermined size Thus, an electrode of Comparative Example 2 was obtained. (Comparative Example 3)
  • PVDF 100 parts by weight was dissolved in 90 parts by weight of NMP to prepare 100 parts by weight of a binder solution.
  • 100 parts by weight of non-graphitizable carbon and 10 parts by weight of a conductive material (Graphite KS 25 made by LON ZA) were dry-mixed with a hyper mixer, and 100 parts by weight of the above binder solution and N were added to this mixture.
  • MP 60 parts by weight was added, and the mixture was stirred and mixed for 60 minutes to obtain an active material layer paint.
  • the paint obtained in Comparative Example 4 was dispersed using a pin-type sand grinder mill using zirconia beads as a dispersion medium so that the residence time of the disperser was 60 minutes, to obtain a paint.
  • the finished paint is applied to one side of the rolled copper foil current collector with a blade coater. After applying and drying, the same paint was applied and dried on the back side, and then compression-molded with a roller press machine and cut into a predetermined size to obtain an electrode of Comparative Example 7. Evaluation method
  • the viscosity of the active material layer paint was measured using a composite plate viscometer, and the yield value was determined from the relationship between shear rate and stress.
  • Example 1 to 5 and Comparative Examples 1 to 7 were cut into a length of 25 mm and a width of 2 O mm, and the upper end was removed with a width of 5 mm to form a 20 mm square electrode layer. Left. A stainless wire was spot-welded as a lead to the upper end from which the electrode layer had been removed to form this electrode (working electrode).
  • a charge / discharge capacity measurement cell was prepared as shown in FIG. 1 and charged / discharged as follows.
  • a beaker 1 a pair of counter electrodes 4 using a lithium plate connected to a stainless steel wire, a lugine tube 6 having a similar reference electrode 5, and an electrode (working electrode) 3 created above between the counter electrodes
  • Electrolyte 7 was prepared by dissolving 1 mo 1/1 lithium perchlorate as an electrolyte salt in a mixed solvent of ethylene power and getyl carbonate in a volume ratio of 1: 1.
  • a cell for measurement was prepared by sealing the beaker and lugine tube with a silicon stopper.
  • This cell is charged and discharged 5 times at a constant current of 2 mA from 0 V to 2 V (Potentia 1 vs. Li / Li + ), and during the first Li ion release. was measured and used as the initial capacity. The fifth capacity was also measured, and the charge / discharge cycle characteristics were obtained.
  • Example 6 The active material layer was produced as follows.
  • Example 6 An electrode of Example 6 was obtained.
  • Example 6 was carried out in the same manner as in Example 6, except that the conductive material was changed to KS6 (Granpite center diameter: 3.8 m, manufactured by LONZA). Apply the finished paint to one side of the aluminum foil current collector with a blade coater. 'Dry and then apply the same paint to the back.'
  • KS6 Garpite center diameter: 3.8 m, manufactured by LONZA
  • Example 7 The electrode of Example 7 was obtained by compression molding with a roller press and cutting to a predetermined size.
  • Example 6 was carried out in the same manner as in Example 6, except that the conductive material was changed to acetylene black (DENKA BLACK manufactured by Denki Kagaku Kogyo).
  • PVDF 6 parts by weight of PVDF was dissolved in 54 parts by weight of NMP to prepare 60 parts by weight of a binder solution.
  • 90 parts by weight of the active material and 4 parts by weight of a conductive material (Graphite KS25 manufactured by LONZA) are dry-mixed with a hypermixer, and 60 parts by weight of the above binder solution and 13 parts by weight of NMP are added to the mixture. The mixture was stirred and mixed for 60 minutes to obtain an active material layer paint.
  • the finished paint is applied to one side of the aluminum foil current collector with a blade coater, dried and then the same paint is applied to the back side.After drying, the product is compression molded with a roller press and cut to a predetermined size. Thus, an electrode of Comparative Example 9 was obtained.
  • the active material layer was produced as follows.
  • Conductive material Granzite KS 25 4 made by LONZA 4 1 1 ⁇ m Binder Elpha Tochem Japan KYNAR 74 1: 4 Polyvinylidene fluoride (PVDF)
  • Solvent N-methyl-2-pyrrolidone (NMP) 67 parts by weight 4 parts by weight of binder was dissolved in 36 parts by weight of solvent to prepare 40 parts by weight of binder solution.
  • 2 parts by weight of the active material 9 and 4 parts by weight of the conductive material were dry-mixed with a hyper mixer, and the mixture was charged into a pressure kneader.
  • 13 parts by weight of the above binder solution was added, and the mixture in the pressurized kneader was kneaded for 30 minutes while being cooled with water, so that the mixture was ground.
  • the kneaded material was removed and 27 parts by weight of a binder solution and 31 parts by weight of a solvent were added and dissolved by a hypermixer to obtain an active material layer paint.
  • Example 8 Apply the finished paint to one side of the current collector of rolled copper foil with a blade coater 'Dry, then apply the same paint on the back side' After drying, press-mold with a roller press machine and cut to predetermined size Thus, an electrode of Example 8 was obtained. (Example 9)
  • Example 8 was carried out in the same manner as in Example 6, except that the conductive material was changed to KS6 (Granpite center particle size: 3.8 m, manufactured by LONZA).
  • Example 9 An electrode of Example 9 was obtained.
  • binder solution 4 parts by weight of the binder was dissolved in 36 parts by weight of the solvent to prepare 40 parts by weight of the binder solution.
  • 9 parts by weight of the active material 9 and 4 parts by weight of the conductive material were dry-mixed with a hypermixer, and 40 parts by weight of the binder solution and the solvent were added to the mixture.
  • Example 8 was carried out in the same manner as in Example 1 except that the conductive material in Example 8 was changed to acetylene black (DENKA BLACK manufactured by Denki Kagaku Kogyo).
  • the finished paint is applied to one side of the aluminum foil current collector with a blade coater. 'After drying, apply the same paint to the back side.'After drying, press-mold with a roller press and cut to a predetermined size. Thus, an electrode of Comparative Example 11 was obtained.
  • JISK 54 00 8.5.1 A test was conducted according to the grid method, and the adhesion of the coating film to the aluminum foil was examined. Cut one side of the coating film coated on both sides of the aluminum foil with a tester (ER I CHS EN MODEL 295 1 mm interval 1 single blade) and make cuts in a grid pattern according to JIS. Scored.
  • the electrode for a non-aqueous electrolyte battery produced by the method of the present invention has good charge / discharge characteristics such as discharge capacity and charge / discharge cycle life, and has improved physical characteristics. It can be used effectively (

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Abstract

L'invention concerne un procédé de production d'une électrode pour cellules électrolytiques non-aqueuses consistant à appliquer, sur les collecteurs, une substance activant l'électrode, laquelle comprend une substance activatrice, du graphite écailleux et un liant, caractérisé en ce que le graphite est mélangé à la substance activatrice et ensuite pulvérisé. Le procédé permet d'obtenir une électrode destinée à des accumulateurs pouvant conférer une grande capacité aux cellules et augmenter la flexibilité desdites cellules.
PCT/JP1998/002312 1997-05-27 1998-05-27 Procede de production d'une electrode pour cellules electrolytiques non-aqueuses WO1998054769A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU74517/98A AU7451798A (en) 1997-05-27 1998-05-27 Method of producing an electrode for non-aqueous electrolytic cells
KR10-1999-7010919A KR100502530B1 (ko) 1997-05-27 1998-05-27 무수 전해질 전지용 전극의 제조방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9/136663 1997-05-27
JP13666397 1997-05-27

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57143262A (en) * 1981-02-27 1982-09-04 Shin Kobe Electric Mach Co Ltd Manufacture of anode body for non-aqueous electrolyte battery
JPH08195201A (ja) * 1995-01-17 1996-07-30 Fuji Photo Film Co Ltd 非水二次電池の負極用合剤の製造方法
JPH08222206A (ja) * 1995-02-16 1996-08-30 Sumitomo Chem Co Ltd リチウム二次電池用正極およびリチウム二次電池
JPH08273669A (ja) * 1995-04-04 1996-10-18 Fuji Elelctrochem Co Ltd 非水電解液電池用正極の製造方法
JPH09129238A (ja) * 1995-10-31 1997-05-16 Matsushita Electric Ind Co Ltd 電 池
JPH09147839A (ja) * 1995-11-29 1997-06-06 Matsushita Electric Ind Co Ltd 非水電解液二次電池用負極の製造法
JPH09171826A (ja) * 1995-12-19 1997-06-30 Tdk Corp リチウム二次電池

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57143262A (en) * 1981-02-27 1982-09-04 Shin Kobe Electric Mach Co Ltd Manufacture of anode body for non-aqueous electrolyte battery
JPH08195201A (ja) * 1995-01-17 1996-07-30 Fuji Photo Film Co Ltd 非水二次電池の負極用合剤の製造方法
JPH08222206A (ja) * 1995-02-16 1996-08-30 Sumitomo Chem Co Ltd リチウム二次電池用正極およびリチウム二次電池
JPH08273669A (ja) * 1995-04-04 1996-10-18 Fuji Elelctrochem Co Ltd 非水電解液電池用正極の製造方法
JPH09129238A (ja) * 1995-10-31 1997-05-16 Matsushita Electric Ind Co Ltd 電 池
JPH09147839A (ja) * 1995-11-29 1997-06-06 Matsushita Electric Ind Co Ltd 非水電解液二次電池用負極の製造法
JPH09171826A (ja) * 1995-12-19 1997-06-30 Tdk Corp リチウム二次電池

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KR100502530B1 (ko) 2005-07-20
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