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WO2018048143A1 - Procédé de fabrication d'une batterie secondaire comprenant une électrode à haute capacité - Google Patents

Procédé de fabrication d'une batterie secondaire comprenant une électrode à haute capacité Download PDF

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Publication number
WO2018048143A1
WO2018048143A1 PCT/KR2017/009595 KR2017009595W WO2018048143A1 WO 2018048143 A1 WO2018048143 A1 WO 2018048143A1 KR 2017009595 W KR2017009595 W KR 2017009595W WO 2018048143 A1 WO2018048143 A1 WO 2018048143A1
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WO
WIPO (PCT)
Prior art keywords
electrode
secondary battery
manufacturing
coating
uncoated portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2017/009595
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English (en)
Korean (ko)
Inventor
안지희
이은주
이명기
송주용
정희석
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Chem Ltd
Original Assignee
LG Chem Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020170107284A external-priority patent/KR102053239B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Priority to CN201780004286.2A priority Critical patent/CN108370031B/zh
Priority to EP17849027.2A priority patent/EP3367480B1/fr
Priority to PL17849027T priority patent/PL3367480T3/pl
Priority to US15/770,699 priority patent/US10818907B2/en
Publication of WO2018048143A1 publication Critical patent/WO2018048143A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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 of manufacturing a secondary battery including a high capacity electrode.
  • lithium secondary batteries with high energy density and operating potential, long cycle life, and low self-discharge rate Batteries have been commercialized and widely used.
  • EVs electric vehicles
  • HEVs hybrid electric vehicles
  • Ni-MH secondary batteries are mainly used as power sources of such electric vehicles (EVs) and hybrid electric vehicles (HEVs).
  • lithium secondary batteries of high energy density, high discharge voltage and output stability are used. Research is actively underway and some are commercialized.
  • the lithium secondary battery has a structure in which a non-aqueous electrolyte containing lithium salt is impregnated in an electrode assembly having a porous separator interposed between a positive electrode and a negative electrode on which an active material is coated on an electrode current collector.
  • the electrode is prepared by mixing an active material and a binder resin component and dispersing it in a solvent to form an electrode mixture, coating it on the surface of the current collector, and then rolling, drying, notching, slitting, and the like.
  • the present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.
  • an object of the present invention in the manufacture of a high-capacity electrode, excessive stress is applied to the electrode mixture layer of the coating part in the rolling process, the electrode mixture layer bursts out of the electrode sheet and the rolling rate of the uncoated portion is less than the rolling rate of the coating portion It is to provide a method of manufacturing an electrode that exhibits high productivity and improved capacity by minimizing a relatively high bending phenomenon.
  • a method of manufacturing an electrode for a secondary battery according to the present invention includes: (a) forming an electrode slurry including an electrode mix and a solvent such that the coating parts are positioned between the uncoated parts. Partially coating on the electrode sheet, (b) drying the coatings to remove the solvent, and (c) rolling the dried coatings, wherein the thickness of the coating in step (c) It is characterized in that the electrode mixture is moved to the uncoated portion while the uncoated portion is extinguished.
  • the electrode slurry is partially applied to form an uncoated portion between the coated portions, and a part of the electrode mixture layer pushed out of the coated portion during the rolling process fills the uncoated portion. Since the stress is dispersed, the production of a defective electrode in which the electrode mixture layer of the coating portion pops out of the electrode sheet can be significantly reduced.
  • the electrode in general, a problem that the electrode is bent due to the high rolling rate of the uncoated portion, but according to the manufacturing method of the present invention, because the portion of the electrode mixture layer of the coating portion is moved to the uncoated portion, the electrode mixture is filled in the uncoated portion
  • the electrode having a uniform thickness as a whole can be manufactured, the lithium ion conductivity of the electrode is uniform and the resistance can be reduced to produce an electrode and a secondary battery with improved capacity and life characteristics.
  • the coating amount of the electrode mixture in the electrode manufactured by the rolling of the step (c) may be 4 mAh / cm 2 or more, more specifically 5 mAh / cm 2
  • the coating amount of the electrode mixture of the present application may be about 4 times or more of the coating amount when the electrode is manufactured in the prior art.
  • the amount of active material required for the movement of lithium ions during the charge and discharge cycle per electrode prepared according to the manufacturing method of the present invention is increased, it can exhibit a high capacity and improved cycle characteristics. 4 mAh / cm 2 Alternatively, even when the electrode mixture is applied in a high amount of 5 mAh / cm 2 or more, the above-described manufacturing method may solve the problem of electrode defects that may appear during rolling.
  • a specific pattern shape may be formed by the uncoated portion in the process (a), and a plurality of coating portions having a predetermined interval or shape may be formed on the electrode sheet by the uncoated portion. have.
  • Each of the uncoated portions serves as a buffer space so that the electrode mixture layer which is pushed out during rolling does not burst out of the electrode sheet, and as a result, the thickness of the rolled coatings may be constant, resulting in an electrode having a uniform quality. It can manufacture.
  • the formation of a pattern shape means that the coating part and the non-coating part are present on the electrode sheet together, and have a specific pattern when the electrode sheet is viewed in a plan view, and form an uneven shape when viewed from the side of the electrode sheet. It means that the slurry is partially coated.
  • the pattern of the uncoated portion may be, for example, a straight line shape, a zigzag shape, a wavy pattern shape, a lattice pattern shape, or a honeycomb shape, but is not limited thereto. Can be formed.
  • the pattern shape of the uncoated portion is not particularly limited as long as the overall coating portion may be uniform after rolling, for example, it may be a triangle, a square or a hexagon in plan, and various coating members when applying the electrode slurry
  • the pattern shape can be determined using the through method.
  • the width of the uncoated portion where the pattern shape disappears after rolling may be 10 ⁇ m to 300 ⁇ m, more specifically 50 ⁇ m to 200 ⁇ m, most preferably 50 ⁇ m to 100 ⁇ m.
  • the width of the uncoated portion is less than 10 ⁇ m, the buffering function during the originally intended rolling cannot be performed beyond the above preferred range, and if the width of the uncoated portion exceeds 300 ⁇ m, rolling is completed. Even if the pattern shape does not disappear locally, an electrode having a uniform thickness or size cannot be formed, which is not preferable.
  • the method used in the application process in the step (a) is not particularly limited as long as it is a method for applying the electrode slurry so that the uncoated portion can form a specific pattern shape as described above, for example, a nozzle scan ( It can be made by one method selected from the group consisting of nozzle scan, die casting, comma coating and screen printing.
  • the manufacturing method may proceed in the order of (b) and (c) after the process (a), and may proceed in the order of (c) and (b), the process (b) Drying in) is not particularly limited as long as it can quickly remove the solvent mixed in the mixture and does not cause chemical change in the electrode mixture.
  • it may be made by mixing hot air drying, or vacuum drying or hot air drying and vacuum drying. After the drying process, a cooling process at room temperature may be further included to stabilize the electrode mixture.
  • the amount of the solvent to be dried and removed may be from 20% to 60% by weight of the solvent added in the first electrode slurry production, more detailed Preferably it can be 20% to 40% by weight, if the solvent in this range is removed, the fluidity enough to push the electrode mixture layer to the uncoated portion in the rolling process of step (c) is preferred Do.
  • the thickness of the electrode mixture layer in the uncoated portion disappeared by the movement of the electrode mixture may be equal to or smaller than the thickness of the electrode mixture layer of the coating portion, more preferably.
  • the thickness of the electrode mixture layer in the uncoated portion dissipated by the movement of the electrode mixture may be the same as the thickness of the electrode mixture layer of the rolled coating portion, so that the electrode produced finally has a uniform thickness as a whole Accordingly, the electrolyte impregnation rate or the conductivity of lithium ions for each part of the electrode is also uniform, so that the charge and discharge efficiency of the secondary battery can be improved.
  • the thickness of the electrode mixture layer rolled in the process (c) may be 100 ⁇ m to 300 ⁇ m.
  • the coating amount decreases, thereby increasing the capacity of the electrode having high capacity and high performance. Since it cannot manufacture, it is unpreferable, and when the thickness of an electrode mixture layer exceeds 300 micrometers, since an active material layer becomes too thick and the impregnation with electrolyte solution falls, it is unpreferable.
  • the present invention also provides an electrode manufactured by the above-described manufacturing method, the secondary battery electrode may be a positive electrode and / or a negative electrode.
  • the positive electrode is manufactured by applying a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector so as to form a predetermined pattern, followed by rolling and drying, according to the manufacturing method of the present invention. Further fillers may be added to the mixture.
  • the conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
  • the binder is a component that assists the bonding of the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • binders examples include polyvinylidene fluoride (PVdF), polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, and poly Vinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers, and the like.
  • PVdF polyvinylidene fluoride
  • PVA polyvinyl alcohol
  • CMC carboxymethyl cellulose
  • EPDM ethylene-propylene-diene terpolymer
  • EPDM ethylene-propylene-diene terpolymer
  • EPDM ethylene-propylene-diene terpolymer
  • EPDM ethylene-propylene-diene terpolymer
  • EPDM ethylene-propylene-diene terpol
  • the filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery.
  • the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.
  • the negative electrode is manufactured by coating the negative electrode active material on the negative electrode current collector so as to form a predetermined pattern, and then rolling and drying the negative electrode active material according to the manufacturing method of the present invention. It may be further included.
  • carbon such as hardly graphitized carbon and graphite type carbon
  • Me: Mn, Fe, Pb, Ge; Me' Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen, 0 ⁇ x ⁇ 1; 1 ⁇ y ⁇ 3; 1 ⁇ z ⁇ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; SnO, SnO 2 , PbO, PbO 2 , Pb 2 O 3 , Pb 3 O 4 , Sb 2 O 3 , Sb 2 O 4 , Sb 2 O 5 , GeO, GeO 2 , Bi 2 O 3 , Bi 2 O 4 , and metal oxides such as Bi 2
  • the electrolyte may be a lithium salt-containing non-aqueous electrolyte, and consists of a non-aqueous electrolyte and a lithium salt.
  • nonaqueous electrolyte nonaqueous organic solvents, organic solid electrolytes, inorganic solid electrolytes, and the like are used, but not limited thereto.
  • non-aqueous organic solvent examples include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, and gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be
  • organic solid electrolyte examples include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating groups and the like can be used.
  • Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides, sulfates and the like of Li, such as Li 4 SiO 4 -LiI-LiOH, Li 3 PO 4 -Li 2 S-SiS 2 , and the like, may be used.
  • the lithium salt is a good material to be dissolved in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6, LiSbF 6, LiAlCl 4, CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide
  • Nitrobenzene derivatives sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyr
  • a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. Carbonate), PRS (Propene sultone) may be further included.
  • lithium salts such as LiPF 6 , LiClO 4 , LiBF 4 , LiN (SO 2 CF 3 ) 2, and the like, may be prepared by cyclic carbonate of EC or PC, which is a highly dielectric solvent, and DEC, DMC, or EMC, which are low viscosity solvents.
  • Lithium salt-containing non-aqueous electrolytes can be prepared by adding them to a mixed solvent of linear carbonates.
  • the present invention provides a secondary battery including the secondary battery electrode, but the type of the secondary battery is not particularly limited, but as a specific example, lithium having advantages such as high energy density, discharge voltage, output stability, and the like. It may be a lithium secondary battery such as an ionic (Li-ion) secondary battery, a lithium polymer (Li-polymer) secondary battery, or a lithium ion polymer (Li-ion polymer) secondary battery.
  • a lithium secondary battery such as an ionic (Li-ion) secondary battery, a lithium polymer (Li-polymer) secondary battery, or a lithium ion polymer (Li-ion polymer) secondary battery.
  • the present invention also provides a battery pack including the secondary battery, and provides a device including the battery pack as a power source.
  • the device may be selected from a mobile phone, a portable computer, a smartphone, a tablet PC, a smart pad, a netbook, a light electronic vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.
  • LEV light electronic vehicle
  • an electric vehicle a hybrid electric vehicle
  • a plug-in hybrid electric vehicle a power storage device.
  • the electrode manufacturing method according to the present invention by coating so that the coating is formed between the uncoated portion having a specific pattern shape during application, the uncoated portion of the buffer space for the coating portion in the rolling process Since it serves to lower the defective rate during electrode production, the electrode mixture layer after the rolling process has a uniform thickness as a whole, it is possible to produce an electrode having excellent quality.
  • FIG. 1 is a flow chart of a manufacturing method according to one embodiment of the present invention.
  • FIG. 2 is a vertical cross-sectional view of the coating direction showing a change in the shape of the electrode produced by the manufacturing method according to FIG. 1;
  • 3 to 7 are plan views showing the pattern shape of the electrode mixture according to one embodiment.
  • FIG. 8 is a vertical cross-sectional view of the coating direction showing the shape of the coating unit according to another embodiment.
  • FIG. 1 is a flow chart of a manufacturing method according to an embodiment of the present invention.
  • the method 100 for manufacturing an electrode for a secondary battery according to the present invention includes an electrode slurry including an electrode mix and a solvent such that the coating parts are positioned between the uncoated parts.
  • the process of partially applying on the electrode sheet 110, drying the coating parts to remove the solvent 120, and rolling the dried coating parts 130 are performed in this order.
  • the electrode slurry is applied to the electrode sheet so that the coating amount of the electrode mixture is 4 mAh / cm 2 or more.
  • the coating amount corresponds to about 4 times or more as compared with the coating amount of the electrode mixture used in the conventional electrode, and the electrode and the secondary battery manufactured according to the manufacturing method of the present invention exhibit high capacity and improved cycle characteristics. Can be.
  • the electrode mixture layer pops out of the electrode sheet during the rolling process, or rolled for each part of the electrode sheet
  • the electrode slurry to form an uncoated portion exhibiting a constant pattern shape which can act as a buffer during the rolling process in step 110 Apply.
  • step 120 Upon drying in step 120, only 20 wt% to 60 wt% of the solvent added during preparation of the electrode slurry is removed, such that the electrode mixture layer may be pushed to the uncoated portion in the rolling process of step 130.
  • the liquidity of can be secured.
  • part of the electrode mixture layer of the coating part is pushed down to the uncoated part having a pattern shape to fill the uncoated part, so that the coating part pops out of the electrode sheet even at a constant pressure.
  • the phenomenon of the electrode warping is significantly reduced.
  • the pattern shape of the uncoated portion disappears by the electrode mixture layer pushed out of the coating portion, and the thickness of the uncoated portion filled with the electrode mixture pushed out of the coating portion may be less than or equal to the thickness of the rolled coating portion. Since the electrode having a uniform thickness as a whole may exhibit better performance, it is more preferable that the thickness of the uncoated portion filled with the electrode mixture layer is equal to the thickness of the coating portion partially pushed out of the electrode mixture layer.
  • the process 120 may proceed after the process 130, in this case it is possible to remove all the solvent of the electrode slurry.
  • Figure 2 is a cross-sectional view showing a change in the form of the electrode produced by the manufacturing method according to Figure 1 in the vertical plane of the coating direction.
  • the electrode slurry 221 is partially applied on the electrode sheet 210 in the process 110 to form the coating part 220 and the uncoated part 230.
  • the uneven structure is formed by the coating part 220 and the uncoated part 230 as shown.
  • the interval between the coating portion 220 that is, the width (D) of the uncoated portion 230
  • the buffering action between the coating portion 220 during rolling it is possible to eliminate all of the uncoated portion 230 It is necessary to ensure a sufficient gap, it may be from 10 ⁇ m to 300 ⁇ m, more specifically from 50 ⁇ m to 200 ⁇ m. Most preferably from 50 ⁇ m to 100 ⁇ m.
  • the coating part 240 having a uniform height as a whole may be formed in the uncoated portion 230 being rolled out.
  • the thickness of the uncoated portion filled with the electrode mixture layer is preferably equal to the thickness (W2) of the electrode mixture layer of the rolled coating portion.
  • the thickness of the expired uncoated portion may be smaller than the thickness W2 of the electrode mixture layer of the rolled coating portion.
  • the linear pressure when rolling the dried coating may be 0.5 to 3.5 ton / cm, more preferably 1 to 3 ton / cm, most preferably 1 to 2 ton / cm. If the linear pressure during rolling is less than 0.5 ton / cm, it is not preferable in terms of uniformity of the electrode, and if the linear pressure exceeds 3.5 ton / cm, the electrode may be broken.
  • the number of rolls of the dried coating part is preferably 1 to 3 times. If the number of rolling exceeds three times, the electrode mixture may be broken, which is not preferable.
  • the thickness W2 of the electrode mixture layer of the rolled coating part may be 100 ⁇ m to 300 ⁇ m, preferably 110 ⁇ m to 250 ⁇ m, and most preferably 130 ⁇ m to 200 ⁇ m.
  • the thickness of the electrode mixture layer of the rolled coating portion is less than 100 ⁇ m, it is not preferable in terms of high capacity and high performance electrode production, and when the thickness of the electrode mixture layer of the rolled coating portion exceeds 300 ⁇ m, it is not preferable in terms of electrolyte solution impregnation. not.
  • the thickness of the electrode mixture layer of the coating part after the rolling may be 30% to 80% of the thickness of the electrode mixture layer of the coating part before the rolling. More preferably 40% to 75%, most preferably 50% to 70%.
  • 3 to 7 are plan views showing the pattern shape of the electrode mixture according to one embodiment.
  • the electrode mixture is included on the electrode sheet so that the uncoated portions 320, 420, 520, 620, and 720 are formed between the coating portions 310, 410, 510, 610, and 710.
  • the uncoated portion forms patterns 300, 400, 500, 600, and 700.
  • the patterns 300, 400, 500, 600, 700 of the uncoated portion may be a straight line 300, a zigzag shape 400, a wave pattern 500, a grid pattern 600 or a honeycomb shape 700
  • the electrode slurry may be applied to form a specific pattern at intervals such that the uncoated portion disappears during rolling.
  • each of the coating parts formed by the pattern shapes 300, 400, 500, 600, 700 of the uncoated part according to FIGS. 3 to 7 is separate from the pattern shapes 300, 400, 500, 600, 700 of the uncoated part.
  • the furnace may take various shapes on a plane, and specifically, may be a triangle 810, a rectangle 820, or a hexagon 830.
  • the coating part may take various shapes.
  • various discharge members or methods may be used when the electrode slurry is applied.
  • the manufacturing failure rate is significantly lowered, showing a high capacity and high efficiency Electrodes can be prepared.

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une électrode pour une batterie secondaire, le procédé comprenant les processus consistant à : (a) appliquer partiellement une suspension d'électrode comprenant un mélange d'électrode et un solvant sur une feuille d'électrode de manière à établir des parties revêtues avec une partie non revêtue interposée entre celles-ci; (b) sécher les parties revêtues pour éliminer le solvant; et (c) laminer les parties revêtues séchées, les parties revêtues dans le processus (c) sont réduites en épaisseur de telle sorte que le mélange d'électrode migre vers la partie non revêtue, avec la disparition consécutive de la partie non revêtue.
PCT/KR2017/009595 2016-09-09 2017-09-01 Procédé de fabrication d'une batterie secondaire comprenant une électrode à haute capacité Ceased WO2018048143A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201780004286.2A CN108370031B (zh) 2016-09-09 2017-09-01 制备包括高容量电极的二次电池的方法
EP17849027.2A EP3367480B1 (fr) 2016-09-09 2017-09-01 Procédé de préparation d'une batterie secondaire comprenant une électrode à haute capacité
PL17849027T PL3367480T3 (pl) 2016-09-09 2017-09-01 Sposób produkcji akumulatora, w tym elektrody o wysokiej pojemności
US15/770,699 US10818907B2 (en) 2016-09-09 2017-09-01 Method of preparing secondary battery including high capacity electrode

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2016-0116233 2016-09-09
KR20160116233 2016-09-09
KR10-2017-0107284 2017-08-24
KR1020170107284A KR102053239B1 (ko) 2016-09-09 2017-08-24 고용량의 전극을 포함하는 이차전지의 제조 방법

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114375513A (zh) * 2020-05-22 2022-04-19 株式会社Lg新能源 包括未涂布部分按压部的电极辊压设备和使用该电极辊压设备的电极辊压方法

Citations (5)

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