WO2023132531A1 - 리튬 이차전지용 전극 및 이의 제조방법 - Google Patents
리튬 이차전지용 전극 및 이의 제조방법 Download PDFInfo
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- WO2023132531A1 WO2023132531A1 PCT/KR2022/021021 KR2022021021W WO2023132531A1 WO 2023132531 A1 WO2023132531 A1 WO 2023132531A1 KR 2022021021 W KR2022021021 W KR 2022021021W WO 2023132531 A1 WO2023132531 A1 WO 2023132531A1
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- WIPO (PCT)
- Prior art keywords
- electrode
- secondary battery
- lithium secondary
- auxiliary coating
- mixture layer
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
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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
- H01M4/139—Processes of manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- 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 an electrode for a lithium secondary battery and a manufacturing method thereof.
- Such a secondary battery is a power generating device capable of charging and discharging with a laminated structure of an anode/separator/cathode.
- a cathode includes lithium metal oxide as a cathode active material and a cathode includes a carbon-based anode active material such as graphite during charging. Lithium ions emitted from the positive electrode are intercalated into the carbon-based negative electrode active material of the negative electrode, and during discharge, lithium ions contained in the carbon-based negative electrode active material are absorbed into lithium metal oxide of the positive electrode, thereby repeating charging and discharging.
- the capacity ratio of each electrode active material can be expressed as N/P ratio, where the N/P ratio is the total capacity of the negative electrode calculated by considering the capacity per area and/or weight of the negative electrode and the area and/or weight of the positive electrode. It is a value divided by the total capacity of the positive electrode obtained considering the capacity per capacity, and is generally adjusted to have a value of 1 or more because it has a significant effect on the safety and capacity of the battery.
- an object of the present invention is to prevent the inversion of the N / P ratio of the positive electrode and negative electrode for lithium secondary batteries from occurring, thereby preventing the degradation of the electrical performance of the secondary battery, while providing a technology that can further improve the safety of the battery. there is.
- the present invention in one embodiment, the present invention
- the electrode current collector includes an auxiliary coating layer positioned at an end of the electrode mixture layer,
- the electrode mixture layer provides a lithium secondary battery electrode having a deviation ( ⁇ a-b ⁇ ) of the length (a) of the surface that contacts the electrode current collector and the length (b) of the surface that does not contact the electrode current collector of 8 mm or less.
- the auxiliary coating layer may include inorganic particles, a phenolic compound, and a binder.
- the inorganic particles may include at least one aluminum mineral selected from boehmite, gibbsite, diaspore, alunite, and nepheline.
- the phenolic compound is tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin , Epigallocatechin gallate, Butein, Piceatenol, Pyrogallic acid, Ellagic acid, Amylose, Amylopectin and Xanthan
- Xanthan gum may be included.
- the auxiliary coating layer may include inorganic particles in an amount of 50 parts by weight or more based on the total weight.
- the auxiliary coating layer may form a layer with the electrode mixture layer in a structure surrounding the end surface of the electrode mixture layer, and may have a thickness of 70% to 100% of the average thickness of the electrode mixture layer.
- an end of the electrode mixture layer may have an inclination angle of 50° or more.
- the electrode mixture layer provides a method for manufacturing an electrode for a lithium secondary battery having a deviation ( ⁇ a-b ⁇ ) of the length (a) of the surface contacting the electrode current collector and the length (b) of the surface not contacting the electrode current collector of 8 mm or less. do.
- the auxiliary coating composition may include inorganic particles, a phenolic compound, and a binder.
- the inorganic particles may be included in an amount of 50 parts by weight or more based on the total weight of the auxiliary coating composition.
- the phenolic compound is tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin , Epigallocatechin gallate, Butein, Piceatenol, Pyrogallic acid, Ellagic acid, Amylose, Amylopectin and Xanthan
- Xanthan gum may be included.
- the phenol compound may be included in an amount of 0.1 to 5 parts by weight based on the total weight.
- the coating of the electrode slurry and the auxiliary coating composition are simultaneously discharged by a slot die, wherein the slot die includes an upper die having a chamber accommodating the electrode slurry; a lower die facing the upper die; A plate-shaped shim member located between the upper die and the lower die, having a hollow in the body communicating with the chamber, and having a discharge port for discharging the electrode slurry from the hollow, wherein the shim member is provided at both ends of the discharge port. It may include a supply groove for supplying the coating composition.
- the shim member may include a partition wall dividing a hollow so that the electrode slurry is divided and discharged in the body, and the partition wall may have a supply groove for supplying an auxiliary coating composition to an edge of each electrode slurry to be divided and discharged.
- the supply groove may include a through portion penetrating in the thickness direction of the shim member, and the through portion may be formed by a predetermined length inward from the discharge lip through which the auxiliary coating composition is discharged.
- the discharge port and the supply groove of the shim member may have a structure in contact with one side of the upper die and the lower die provided with the discharge port and the discharge lip from the inside.
- an auxiliary coating layer containing inorganic particles, a phenolic compound, and a binder is provided at the end of the electrode mixture layer containing an electrode active material to surround or cover the surface with a predetermined thickness, so that at the end of the electrode mixture layer Since the thickness variation of is improved, the energy density of the battery is improved, and the adhesion of the separator at the end of the electrode is improved, so that lithium can be prevented from being precipitated at the end of the electrode, especially the negative electrode, and there is an advantage of excellent safety.
- FIG. 1 is a cross-sectional view showing one end of an electrode mixture layer provided in an electrode for a lithium secondary battery, (a) shows a cross-sectional structure of a conventional electrode, and (b) shows a cross-sectional structure of an electrode according to the present invention.
- FIG. 2 is a perspective view schematically showing the structure of a slot die according to the present invention.
- FIG 3 is a plan view showing an example of a shim member according to the present invention.
- FIG. 4 is a perspective view showing the structure of a supply groove provided in a body and/or a partition wall of a shim member.
- FIG. 5 is a plan view showing an inlet of a discharge port and a supply groove provided in a core member.
- 6 and 7 are cross-sectional views showing end structures of electrode mixture layers of positive and negative electrodes according to the presence or absence of an auxiliary coating layer, respectively.
- the term "comprises” or “has” is intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.
- a part such as a layer, film, region, plate, etc. when a part such as a layer, film, region, plate, etc. is described as being “on” another part, this includes not only the case where it is “directly on” the other part, but also the case where another part is present in the middle thereof. . Conversely, when a part such as a layer, film, region, plate, or the like is described as being “under” another part, this includes not only being “directly under” the other part, but also the case where there is another part in the middle. In addition, in the present application, being disposed “on” may include the case of being disposed not only on the upper part but also on the lower part.
- "contains as a main component” is 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, 90% by weight or more, It may mean 95% by weight or more or 97.5% by weight or more, and in some cases, when constituting the entire composition or a specific component, that is, it may mean 100% by weight.
- the "sliding angle" of the end of the electrode mixture layer is based on the electrode current collector when the electrode mixture layer provided on the electrode current collector slides from the inside to the outside to observe the cross section of the electrode mixture layer.
- the angle induced at the end of the electrode mixture layer by the sliding of the electrode mixture layer may mean the sliding angle of the electrode mixture layer, and may also be referred to as the "end inclination angle" of the electrode mixture layer.
- the present invention in one embodiment, the present invention
- the electrode current collector includes an auxiliary coating layer positioned at an end of the electrode mixture layer,
- the electrode mixture layer provides a lithium secondary battery electrode having a deviation ( ⁇ a-b ⁇ ) of the length (a) of the surface that contacts the electrode current collector and the length (b) of the surface that does not contact the electrode current collector of 8 mm or less.
- An electrode for a lithium secondary battery according to the present invention includes an electrode mixture layer containing an electrode active material on an electrode current collector, and an auxiliary coating layer is provided at an edge, that is, an end of the electrode mixture layer, to form a single layer together with the electrode mixture layer and the auxiliary coating layer. contains a layer
- the electrode of the present invention can improve the sliding phenomenon at the end of the electrode mixture layer as shown in FIG. 1(b) by providing an auxiliary coating layer at the end of the electrode mixture layer. Accordingly, since the electrode can suppress the occurrence of thickness variation at the end of the electrode mixture layer, the effect of improving the energy density of the battery is excellent. In addition, the electrode has an excellent effect of improving durability and/or safety of the battery because the adhesive force at the end of the separator is increased.
- the auxiliary coating layer may be prepared by simultaneously applying the auxiliary coating composition for forming the auxiliary coating layer to the edge of the electrode slurry applied when the electrode slurry for forming the electrode mixture layer is applied to the electrode current collector.
- the auxiliary coating layer surrounds or covers the end surface of the electrode mixture layer, and thus has a structure forming one layer together with the electrode mixture layer.
- the auxiliary coating composition co-applied with the electrode slurry comes into contact with the end surface of the electrode slurry to form a shape surrounding or covering the end of the electrode slurry, and drying the electrode slurry and auxiliary coating composition of this shape to form an electrode mixture layer and An auxiliary coating layer is formed.
- the end surface may mean a region exposed to a side surface of the electrode mixture layer.
- the height of the auxiliary coating layer derived from the auxiliary coating composition may have a ratio of 70% to 100% based on the average height of the electrode slurry (or electrode mixture layer), specifically 75% to 100%; 80% to 100%; 90% to 100%; 70% to 95%; 70% to 90%; 70% to 85%; Or it may have a ratio of 80% to 90%.
- a dam function can be implemented to prevent the edge region of the electrode slurry applied during formation of the electrode mixture layer from being pushed outward due to a sliding phenomenon.
- the auxiliary coating layer may include components capable of improving a sliding phenomenon of an end portion of the electrode mixture layer, and the components may exhibit insulating properties.
- the auxiliary coating layer may include inorganic particles, a phenolic compound, and a binder.
- the inorganic particles may perform a function of suppressing a sliding phenomenon at the end of the electrode mixture layer.
- Such inorganic particles may include at least one aluminum mineral selected from among boehmite, gibbsite, diaspore, alunite, and nepheline.
- the phenolic compound may increase the dispersibility of the inorganic particles included in the auxiliary coating layer and increase the adhesion of the end portion of the electrode mixture layer to the separator by distributing a large amount of the binder on the surface of the auxiliary coating layer.
- These phenolic compounds include tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin, Epigallocatechin gallate, butein, piceatenol, pyrogallic acid, ellagic acid, amylose, amylopectin and xanthan gum (Xanthan gum).
- the binder may be applied without particular limitation as long as it is commonly used for lithium secondary battery electrodes in the art, but specifically, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) , styrene-butadiene rubber (SBR), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, ethylene-tetrafluoroethylene Ethylene copolymer, polychlorotrifluoroethylene, vinylidene fluoride-pentafluoropropylene copolymer, propylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene -
- the content of the inorganic particles and the phenolic compound in the auxiliary coating layer may be controlled to satisfy a certain range.
- the inorganic particles are 50% by weight or more, 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, 80% by weight or more, 90% by weight or more, 95% by weight or more, based on the total weight of the auxiliary coating layer. % or more or 97.5% by weight or more, more specifically, 50 to 90% by weight, 50 to 80% by weight, 55 to 85% by weight, 50 to 65% by weight, 60 to 80% by weight based on the total weight of the auxiliary coating layer %, 65 to 85% by weight or 70 to 85% by weight.
- the present invention by controlling the content of the inorganic particles in the above range, it is possible to prevent the effect of suppressing the sliding phenomenon of the electrode mixture layer from being insignificant due to the low content, and to prevent the inorganic particles from detaching from the surface of the auxiliary coating layer due to the high content. It can be prevented.
- the phenolic compound may be included in an amount of 0.01 to 5% by weight based on the total weight of the auxiliary coating layer, specifically 0.1 to 3% by weight, 1 to 3% by weight, or 1.5 to 2.5% by weight.
- the present invention by controlling the content of the phenolic compound within the above range, it is possible to prevent aggregation of inorganic particles in the auxiliary coating layer due to the low content or precipitation of inorganic particles due to phase instability of the coating composition during preparation of the auxiliary coating layer, , it is possible to prevent the adhesive strength of the auxiliary coating layer to the electrode current collector from being lowered due to the high content.
- the auxiliary coating layer may include 72 to 78 wt% of inorganic particles, 1.8 to 2.2 wt% of a phenolic compound, and 19.8 to 26.2 wt% of a binder.
- the sliding phenomenon at the end of the electrode mixture layer can be improved by providing the auxiliary coating layer at the edge, that is, the end of the electrode mixture layer.
- the length deviation of both sides of the electrode mixture layer may be 8 mm or less.
- the electrode has a length deviation ( ⁇ a-b ⁇ ) of both sides of the electrode mixture layer of 7 mm or less, 6 mm or less, 5 mm or less, 4 mm or less, 3 mm or less, 2 mm or less, 1 mm or less, or 0.5 mm or less. It may be less than, and in some cases may be less than 0.5 mm.
- FIG. 1 is a cross-sectional view showing one end of an electrode mixture layer.
- a sliding phenomenon is severe at the end of the electrode mixture layer as in (a), and accordingly, the length of the surface in contact with the electrode current collector (a) ) and the deviation ( ⁇ a-b ⁇ or 2c) of the length (b) of the surface not in contact with the electrode current collector exceeds 8 mm.
- the electrode according to the present invention has an auxiliary coating layer, so that the sliding phenomenon generated at the end of the electrode mixture layer is suppressed as shown in (b), so that the length (a) of the surface contacting the electrode current collector and the surface not contacting the electrode current collector The deviation ( ⁇ a-b ⁇ or 2c) of the length (b) of is reduced to 8 mm or less.
- the electrode for a lithium secondary battery has a deviation ( ⁇ a-b ⁇ ) between the length (a) of a surface in contact with the electrode current collector and the length (b) of a surface that does not contact the electrode current collector, in the case of a negative electrode, 2.5 to 3.5 mm, and in the case of an anode, it may be 0.05 to 0.5 mm.
- the electrode for a lithium secondary battery of the present invention may have a sliding angle, that is, an inclination angle of 50° or more at the end of the electrode mixture layer.
- the inclination angle of the end of the electrode mixture layer may be 60 ° or more, 70 ° or more, 80 ° or more, 90 ° or more, or 100 ° or more, more specifically, 50 ° to 120 °, 60 ° to 110 °, 70° to 100°, 75° to 95° or 80° to 95°.
- the present invention can control the N/P ratio, which represents the ratio of the capacity of the positive electrode and the capacity of the negative electrode, to have a value of 1 or more by controlling the length deviation of both sides and/or the inclination angle of the end of the electrode mixture layer within the above range. can improve the safety and dosage of
- the electrode for a lithium secondary battery of the present invention may be applied to both a positive electrode and a negative electrode used in a lithium secondary battery.
- the current collector may be one having high conductivity without causing chemical change in the battery.
- stainless steel, aluminum, nickel, titanium, calcined carbon, etc. may be used, and aluminum or stainless steel may be surface-treated with carbon, nickel, titanium, silver, or the like.
- the positive electrode current collector may form fine irregularities on the surface to increase the adhesion of the positive electrode active material, and various forms such as films, sheets, foils, nets, porous bodies, foams, and nonwoven fabrics are possible.
- the average thickness of the current collector may be appropriately applied in the range of 3 to 500 ⁇ m in consideration of the conductivity and total thickness of the anode to be manufactured.
- the electrode mixture layer provided on the electrode current collector may include a positive electrode active material, and may optionally further include a conductive agent, a binder, an additive, and the like, if necessary.
- the positive electrode active material is a positive electrode active material capable of reversibly intercalating and deintercalating, and may include at least one of a lithium metal composite oxide represented by Formula 1 and a lithium iron phosphate represented by Formula 2 below. :
- M 1 is composed of W, Cu, Fe, V, Cr, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B and Mo At least one doping element selected from the group,
- x, y, z, w, v and u are 1.0 ⁇ x ⁇ 1.30, 0.6 ⁇ y ⁇ 0.95, 0.01 ⁇ z ⁇ 0.5, 0.01 ⁇ w ⁇ 0.5, 0 ⁇ v ⁇ 0.2, 1.5 ⁇ u ⁇ 4.5, respectively.
- M 2 is at least one doping element selected from the group consisting of Ni, Co, Mn, and V;
- p and q are 0.05 ⁇ p ⁇ 0.2 and 2 ⁇ q ⁇ 6, respectively.
- the cathode active material may include a lithium metal composite oxide including nickel (Ni), cobalt (Co), and manganese (Mn), and the lithium metal composite oxide may optionally contain other transition metals ( M 1 ) may have a doped form.
- the cathode active material is Li(Ni 0.6 Co 0.2 Mn 0.2 )O 2 , Li(Ni 0.7 Co 0.15 Mn 0.15 )O 2 , Li(Ni 0.8 Co 0.1 Mn 0.1 )O 2 , Li( Ni 0.9 Co 0.05 Mn 0.05 )O 2 , Li(Ni 0.6 Co 0.2 Mn 0.1 Zr 0.1 )O 2 , Li(Ni 0.6 Co 0.2 Mn 0.15 Zr 0.05 )O 2 and Li(Ni 0.7 Co 0.1 Mn 0.1 Zr 0.1 )O It may include one or more selected from the group consisting of 2 .
- the cathode active material may include lithium phosphate containing iron, and the lithium phosphate may have a form doped with another transition metal (M 2 ) in some cases.
- the lithium iron phosphate may include at least one of LiFePO 4 , LiFe 0.8 Mn 0.2 PO 4 and LiFe 0.5 Mn 0.5 PO 4 .
- the content of the cathode active material may be 85 to 95 parts by weight, specifically 88 to 95 parts by weight, 90 to 95 parts by weight, 86 to 90 parts by weight, or 92 to 95 parts by weight, based on 100 parts by weight of the cathode electrode mixture layer.
- the conductive material is used to improve the electrical performance of the positive electrode, and those commonly used in the art can be applied, but specifically, natural graphite, artificial graphite, carbon black, acetylene black, Denka black, Ketjen At least one selected from the group consisting of black, super-P, channel black, furnace black, lamp black, summer black, graphene, and carbon nanotubes may be included.
- the conductive material may be used alone or in combination with carbon black or Denka Black.
- the conductive material may be included in an amount of 0.1 to 5 parts by weight, specifically 0.1 to 4 parts by weight, based on 100 parts by weight of the cathode electrode mixture layer; 2-4 parts by weight; 1.5 to 5 parts by weight; 1 to 3 parts by weight; 0.1 to 2 parts by weight; or 0.1 to 1 part by weight.
- the binder serves to bind the positive electrode active material, the positive electrode additive, and the conductive material to each other, and any binder having such a function may be used without particular limitation.
- the binder includes polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-co-HFP), polyvinylidenefluoride (PVdF), polyacrylonitrile, polymethylmethacryl It may include at least one resin selected from the group consisting of polymethylmethacrylate and copolymers thereof.
- the binder may include polyvinylidenefluoride.
- the binder may include 1 to 10 parts by weight, specifically 2 to 8 parts by weight, based on the total 100 parts by weight of the electrode mixture layer; Alternatively, 1 to 5 parts by weight of the conductive material may be included.
- the average thickness of the electrode mixture layer is not particularly limited, but may be specifically 50 ⁇ m to 300 ⁇ m, more specifically 100 ⁇ m to 200 ⁇ m; 80 ⁇ m to 150 ⁇ m; 120 ⁇ m to 170 ⁇ m; 150 ⁇ m to 300 ⁇ m; 200 ⁇ m to 300 ⁇ m; Or it may be 150 ⁇ m to 190 ⁇ m.
- the electrode current collector is not particularly limited as long as it does not cause chemical change in the battery and has high conductivity.
- copper, stainless steel, nickel, titanium, sintering Carbon, etc. may be used, and in the case of copper or stainless steel, those surface-treated with carbon, nickel, titanium, silver, or the like may be used.
- the negative electrode current collector may form fine irregularities on the surface to strengthen the bonding force with the negative electrode active material, and various forms such as films, sheets, foils, nets, porous bodies, foams, and nonwoven fabrics are available. possible.
- the average thickness of the negative electrode current collector may be appropriately applied in the range of 3 to 500 ⁇ m in consideration of the conductivity and total thickness of the negative electrode to be manufactured.
- the negative electrode active material may include, for example, at least one of a carbon material and a silicon material.
- the carbon material refers to a carbon material containing carbon atoms as a main component, and examples of the carbon material include graphite having a completely layered crystal structure such as natural graphite, a low-crystalline graphene structure; a hexagonal honeycomb plane of carbon soft carbon having this layered structure) and hard carbon in which these structures are mixed with amorphous portions, artificial graphite, expanded graphite, carbon fiber, non-graphitizable carbon, carbon black, acetylene black, Ketjen black, carbon It may include nanotubes, fullerenes, activated carbon, graphene, carbon nanotubes, and the like, preferably at least one selected from the group consisting of natural graphite, artificial graphite, graphene, and carbon nanotubes.
- the carbon material includes natural graphite and/or artificial graphite, and may include at least one of graphene and carbon nanotubes together with the natural graphite and/or artificial graphite.
- the carbon material may include 0.1 to 10 parts by weight of graphene and/or carbon nanotubes based on 100 parts by weight of the total carbon material, and more specifically, 0.1 to 5 parts by weight based on 100 parts by weight of the total carbon material. wealth; Alternatively, 0.1 to 2 parts by weight of graphene and/or carbon nanotubes may be included.
- the silicon material is a particle containing silicon (Si) as a main component as a metal component, and may include at least one of a silicon (Si) particle and a silicon oxide (SiO X , 1 ⁇ X ⁇ 2) particle.
- the silicon material may include silicon (Si) particles, silicon monoxide (SiO) particles, silicon dioxide (SiO 2 ) particles, or a mixture of these particles.
- the silicon material when applied as an anode active material together with a carbon material, it may be included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the negative electrode mixture layer, and specifically, 5 to 20 parts by weight based on 100 parts by weight of the negative electrode mixture layer. wealth; 3 to 10 parts by weight; 8 to 15 parts by weight; 13 to 18 parts by weight; or 2 to 7 parts by weight.
- the present invention by adjusting the content of the silicon material included in the negative electrode active material within the above range, it is possible to improve the charging capacity per unit mass while reducing lithium consumption and irreversible capacity loss during initial charging and discharging of the battery.
- the negative electrode active material may include 95 ⁇ 2 parts by weight of graphite based on 100 parts by weight of the negative electrode mixture layer; It may include 5 ⁇ 2 parts by weight of a mixture in which silicon monoxide (SiO) particles and silicon dioxide (SiO 2 ) particles are uniformly mixed.
- SiO silicon monoxide
- SiO 2 silicon dioxide
- the negative electrode mixture layer may have an average thickness of 100 ⁇ m to 200 ⁇ m, specifically 100 ⁇ m to 180 ⁇ m, 100 ⁇ m to 150 ⁇ m, 120 ⁇ m to 200 ⁇ m, 140 ⁇ m to 200 ⁇ m, or 140 ⁇ m. to 160 ⁇ m in average thickness.
- the electrode for a lithium secondary battery according to the present invention has the above structure, the thickness deviation at the end of the electrode mixture layer is improved, so the energy density of the battery is improved, and the adhesive strength of the separator at the end of the electrode is improved, so that the electrode, especially at the end of the negative electrode It is possible to prevent the precipitation of lithium, so there is an advantage of excellent safety.
- the electrode mixture layer provides a method for manufacturing an electrode for a lithium secondary battery having a deviation ( ⁇ a-b ⁇ ) of the length (a) of the surface contacting the electrode current collector and the length (b) of the surface not contacting the electrode current collector of 8 mm or less. do.
- the method for manufacturing an electrode for a lithium secondary battery according to the present invention is a method for manufacturing the above-described electrode for a lithium secondary battery, which includes an electrode active material by simultaneously coating an electrode slurry containing an electrode active material and an auxiliary coating composition on an electrode current collector and manufacturing an electrode having a structure in which an electrode mixture layer and an auxiliary coating layer are disposed at an end thereof.
- the present invention can improve the sliding phenomenon at the end of the electrode mixture layer by simultaneously coating the electrode slurry for forming the electrode mixture layer and the auxiliary coating composition for forming the auxiliary coating layer provided at the end of the electrode mixture layer during formation of the electrode mixture layer. Accordingly, the present invention has an excellent effect of improving the energy density of the battery because it is possible to suppress the occurrence of thickness variation at the end of the electrode mixture layer. In addition, the manufactured electrode has an excellent effect of improving the durability and/or safety of the battery because the adhesive force at the end of the separator is increased.
- the lithium secondary battery electrode manufactured by the above manufacturing method has a length deviation of both sides of the electrode mixture layer, that is, the length (a) of the surface contacting the electrode current collector and the length of the surface not contacting the electrode current collector (
- the deviation ( ⁇ a-b ⁇ ) of b) may be 8 mm or less.
- the electrode has a length deviation ( ⁇ a-b ⁇ ) of both sides of the electrode mixture layer of 7 mm or less, 6 mm or less, 5 mm or less, 4 mm or less, 3 mm or less, 2 mm or less, 1 mm or less, or 0.5 mm or less. It may be less than, and in some cases may be less than 0.5 mm.
- the auxiliary coating composition may include inorganic particles, a phenolic compound and a binder.
- the inorganic particles may perform a function of suppressing a sliding phenomenon at the end of the electrode mixture layer.
- Such inorganic particles may include at least one aluminum mineral selected from among boehmite, gibbsite, diaspore, alunite, and nepheline.
- the phenolic compound may increase the dispersibility of the inorganic particles included in the auxiliary coating layer and increase the adhesion of the end portion of the electrode mixture layer to the separator by distributing a large amount of the binder on the surface of the auxiliary coating layer.
- These phenolic compounds include tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin, Epigallocatechin gallate, butein, piceatenol, pyrogallic acid, ellagic acid, amylose, amylopectin and xanthan gum (Xanthan gum).
- the binder may be applied without particular limitation as long as it is commonly used for lithium secondary battery electrodes in the art, but specifically, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) , styrene-butadiene rubber (SBR), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, ethylene-tetrafluoroethylene Ethylene copolymer, polychlorotrifluoroethylene, vinylidene fluoride-pentafluoropropylene copolymer, propylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene -
- the content of the inorganic particles and the phenolic compound in the auxiliary coating composition may be controlled to satisfy a certain range.
- the inorganic particles are 50% by weight or more, 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, 80% by weight or more, 90% by weight or more, 95% by weight or more, based on the total weight of the auxiliary coating composition.
- auxiliary coating layer It may be included in more than 97.5% by weight or more, more specifically, 50 to 90% by weight, 50 to 80% by weight, 55 to 85% by weight, 50 to 65% by weight, 60 to 80% by weight based on the total weight of the auxiliary coating layer It may be included in weight%, 65 to 85% by weight or 70 to 85% by weight.
- the present invention by controlling the content of the inorganic particles in the above range, it is possible to prevent the effect of suppressing the sliding phenomenon of the electrode mixture layer from being insignificant due to the low content, and to prevent the inorganic particles from detaching from the surface of the auxiliary coating layer due to the high content. It can be prevented.
- the phenolic compound may be included in 0.01 to 5% by weight based on the total weight of the auxiliary coating composition, specifically 0.1 to 3% by weight, 1 to 3% by weight, or 1.5 to 2.5% by weight.
- the present invention by controlling the content of the phenolic compound within the above range, it is possible to prevent aggregation of inorganic particles in the auxiliary coating composition due to the low content or precipitation of inorganic particles due to phase instability of the coating composition during preparation of the auxiliary coating composition. And, due to the high content, it is possible to prevent the adhesive strength of the auxiliary coating layer to the electrode current collector from deteriorating.
- the auxiliary coating composition may include 72 to 78% by weight of inorganic particles, 1.8 to 2.2% by weight of a phenolic compound, and 19.8 to 26.2% by weight of a binder.
- coating of the electrode slurry and the auxiliary coating composition may be performed by a simultaneous coating method commonly applied in the art, but may be specifically implemented by a slot die as shown in FIG. 2 .
- the slot die 100 includes an upper die 110 having a chamber accommodating an electrode slurry; a lower die 120 facing the upper die; A plate-shaped shim member 130 located between the upper die and the lower die, having a hollow in the body communicating with the chamber C, and having a discharge port for discharging electrode slurry from the hollow, the shim member 130 130 may include a supply groove 135 for supplying an auxiliary coating composition to both ends of the discharge port 134 .
- the upper die 110 and the lower die 120 are coupled to each other to form a die portion.
- the upper die 110 and the lower die 120 may be directly coupled to each other, but indirectly through an intermediate medium or the like. can also be combined.
- the upper die 110 and the lower die 120 form an inner space, that is, a chamber, by being coupled to each other at the edge area. At this time, the inner space is a space where the electrode slurry is received and stayed before being discharged to the outside through the outlet.
- the shim member 130 is interposed between the upper die and the lower die when the upper die 110 and the lower die 120 are coupled, and has a hollow 132 having a central portion, so that the chamber formed by the die unit is mutually connected with each other. It works. Through this, both the chamber and the hollow form a space in which the electrode slurry is accommodated.
- the shim member 130 has a plate-shaped body 131, the body 131 is a chamber of the upper die of the die It has a hollow 132 in communication with.
- the hollow 132 includes a discharge port 134 for discharging the electrode slurry supplied from the chamber to one side of the body 131, and a supply groove 135 for supplying an auxiliary coating composition to both ends of the discharge port 134 this is provided That is, a supply groove 135 for supplying an auxiliary coating composition to both sides of the discharge port 134 may be further included on one side of the body 131 on which the discharge port 134 is formed.
- the shim member 130 includes one or more partition walls 133 dividing the hollow 132 so that the electrode slurry is divided and discharged to the body 131.
- the barrier rib 133 may have a supply groove 135 for supplying an auxiliary coating composition to an edge of each electrode slurry that is divided and discharged.
- the shim member 130 may be multi-row coated by having a partition wall 133 dividing the hollow, and the supply groove 135 provided in the partition wall 133 is provided on both edges of the discharged electrode slurry to form a secondary coating composition.
- Two discharge lips 136 may be included at the lower end of one partition wall 133 so that the liquid may be supplied adjacently.
- Figure 4 is a perspective view showing the structure of the supply groove 235 provided in the body 231 and / or the partition wall 233 of the shim member, the supply groove 235 is a secondary coating on both sides of the discharge port 234 It is provided in the body 231 and/or the partition wall 233 of the shim member 230 to supply the composition, and includes a through portion 237 penetrating in the thickness direction of the shim member 230, and the through portion ( 237) may have a structure formed by a predetermined length from the inlet of the supply groove 235 through which the auxiliary coating composition is discharged, that is, the discharge lip 236 into the body.
- a shim member used in a slot die applied in the art includes a discharge port and / or a supply groove, and the discharge port and the supply groove have a height of a channel through which an auxiliary coating composition is finally supplied is higher than a height of a channel of electrode slurry. It has a partially blocked structure to have a step by a predetermined length from the discharge lip of the supply groove to the inside like a groove (groove) for placement. In this case, since the amount of the composition remaining in the slot die increases due to the step of the discharge lip through which the auxiliary coating composition is discharged, the electrode slurry can be uniformly coated more stably when forming the electrode mixture layer.
- the auxiliary coating composition when the height of the passage is higher than the discharge port through which the electrode slurry is discharged by inducing a step at the inlet of the supply groove, the auxiliary coating composition is biased to the downstream side, so that the auxiliary coating layer prevents sliding of the electrode mixture layer. There is a problem that doesn't prevent enough.
- the shim member 230 used in the present invention provides a supply groove 235 to have a through portion 237 penetrated in the thickness direction of the shim member by a predetermined length inward from the inlet through which the auxiliary coating composition is discharged. While the auxiliary coating composition increases the amount of the composition staying inside the slot die, it is possible to prevent the auxiliary coating composition from being coated downstream.
- FIG. 5 is a plan view showing the structure of the discharge port 334 and the inlet (ie, discharge lip 336) of the supply groove 335 provided in the shim member 330, wherein the shim member 330 includes an upper die and a lower die. It is positioned between, but may be located inside the upper die and the lower die overlapping the surface on which the discharge port 334 for discharging the electrode slurry and the discharge lip 336 for discharging the auxiliary coating composition are formed.
- the discharge lip 336 for discharging the auxiliary coating composition may be provided at both inner ends of the discharge port 334 for discharging the electrode slurry.
- the discharge port 334 and the discharge lip 336 provided in the core member may have a structure in contact at a point 338 spaced inward by a predetermined length based on one side of the upper die and the lower die where they are located. .
- the discharge port 334 and the discharge lip 336 are recessed by 10 ⁇ m to 1,000 ⁇ m based on one side surface of the overlapping upper die and lower die (eg, a plane perpendicular to the bonding surface of the upper die and the lower die), Specifically, 50 ⁇ m to 750 ⁇ m; 50 ⁇ m to 500 ⁇ m; 200 ⁇ m to 400 ⁇ m; or at entry points spaced inwardly by 80 ⁇ m to 200 ⁇ m.
- the discharge port 334 and the discharge lip 336 of the shim member 330 exist inside the upper die and the lower die, so that the electrode slurry supplied from the discharge port and the auxiliary coating composition supplied from the supply groove are applied to the electrode current collector. It can be simultaneously ejected in a contacted state inside the die before reaching it. Accordingly, the auxiliary coating composition simultaneously discharged can implement a shape that surrounds or covers the end surface at a height ratio of 70% to 100% relative to the average height of the applied electrode slurry, so that the sliding phenomenon of the electrode slurry can be more effectively prevented. there is.
- the secondary coating Since the composition is not formed at the end of the electrode slurry to a sufficient thickness compared to the average height of the electrode slurry to be applied, there is a limit in that the auxiliary coating composition cannot sufficiently develop a dam function.
- the method for manufacturing a lithium secondary battery according to the present invention has the above-described structure, the sliding phenomenon of the electrode slurry to constitute the electrode mixture layer can be improved, and thus the thickness deviation at the end of the electrode mixture layer is improved, so that the energy density of the battery is increased.
- the adhesive strength of the separator at the end of the electrode is improved, it is possible to prevent lithium from being deposited at the end of the electrode, particularly the negative electrode, and thus has an advantage of excellent safety.
- a secondary coating composition was prepared by preparing boehmite, tannic acid, styrene butadiene rubber (SBR) and polyvinylidene fluoride (PVdF), weighing them as shown in Table 1 and mixing them in N-methylpyrrolidone did At this time, the solid content of each auxiliary coating composition prepared was adjusted as shown in Table 1.
- a cathode for a lithium secondary battery a thin aluminum plate (average thickness: 30 ⁇ m) was prepared as a cathode current collector, and 97.5 parts by weight of LiNi 0.7 Co 0.1 Mn 0.2 O 2 as a cathode active material as a cathode slurry; 1 part by weight of carbon nanotubes as a conductive material; 1.5 parts by weight of PVdF as a binder was weighed and prepared by mixing it with N-methylpyrrolidone.
- a thin copper plate (average thickness: 30 ⁇ m) is prepared as an anode current collector, and 60 to 99 parts by weight of artificial graphite as an anode active material is used as an anode slurry; 0.5 to 20 parts by weight of carbon nanotubes and carbon black as conductive materials; It was prepared by weighing 0.2 to 20 parts by weight of styrene butadiene rubber (SBR) as a binder and mixing it with water.
- SBR styrene butadiene rubber
- An electrode for a lithium secondary battery was prepared by fixing each electrode current collector to a coating device having a slot die and supplying the electrode slurry and the auxiliary coating composition prepared in Preparation Example through the slot die.
- the type of electrode prepared and the type of auxiliary coating composition supplied through the slot die are shown in Table 2 below.
- the slot die has a structure in which an upper die and a lower die having a chamber are coupled, a shim member is interposed between the upper die and the lower die, and the shim member has a plate-shaped body having a hollow in communication with the chamber.
- the structure of the core member has a discharge port through which the electrode slurry supplied through the hollow is discharged on one side, as shown in (b) of FIG.
- supply grooves on the end of the inner surface of the bulkhead and the body disposed in parallel with the bulkhead so that the auxiliary coating composition prepared in Manufacturing Example is discharged to both sides of each discharge port (first discharge port and second discharge port) divided by the barrier rib Is provided, but the supply groove has a structure in which two discharge lips are provided in the partition wall and one discharge lip in the body, and a through portion passing through the core member in the thickness direction is formed about 0.5 to 2 mm inward from the inlet of the supply groove.
- the discharge lip through which the auxiliary coating composition is supplied has a partition wall so as to be located inside the upper die and the lower die, and the inner surface end of the body disposed in parallel with the partition wall is about 100 ⁇ m based on the side surfaces of the upper die and the lower die. It may have an inwardly recessed form 338 .
- Example 1 anode Auxiliary coating composition of Preparation Example 1
- Example 2 cathode Auxiliary coating composition of Preparation Example 1
- Example 3 anode Auxiliary coating composition of Preparation Example 2
- Example 4 cathode Auxiliary coating composition of Preparation Example 2
- Example 5 anode Auxiliary coating composition of Preparation Example 3 Comparative Example 1 cathode Auxiliary coating composition of Preparation Example 3
- the electrode slurry is applied on the electrode current collector by a slot die, and the auxiliary coating composition of Table 3 is applied to the edge of the continuously applied electrode slurry to prepare an electrode for a lithium secondary battery did
- the electrode for a lithium secondary battery according to the present invention has an improved sliding phenomenon at the end of the electrode mixture layer.
- the electrode of the embodiment in which the auxiliary coating layer is simultaneously coated at the end of the electrode mixture layer has the length (a) of the surface of the electrode mixture layer in contact with the electrode current collector and the length (a) of the electrode mixture layer
- the deviation ( ⁇ a-b ⁇ ) of the length (b) of the surface that is, the deviation ( ⁇ a-b ⁇ ) of the length of the upper and lower surfaces of the electrode mixture layer is less than 2 mm in the case of the positive electrode, specifically 1.2 mm or less, and less than 8 mm in the case of the negative electrode, specifically was found to be less than 7.5 mm.
- the sliding angles of the electrodes of the examples exceeded 80° for both the positive electrode and the negative electrode.
- the electrode for a lithium secondary battery according to the present invention is provided with an auxiliary coating layer containing inorganic particles, a phenolic compound, and a binder at the end of the electrode mixture layer containing the electrode active material, so that the thickness deviation at the end of the electrode mixture layer is improved. It can be seen that the energy density of the battery is improved and the adhesion of the separator at the end of the electrode is improved, thereby preventing lithium from being deposited at the end of the electrode, particularly the negative electrode.
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Abstract
Description
단위: 중량% | 뵘석 | PVdF | 탄닌산 | 고형분 |
제조예 1 | 50~89.9 | 10~40 | 0.1~10 | 25% |
제조예 2 | 60~90 | 10~40 | 0 | 25% |
제조예 3 | 30~49.9 | 41~79.9 | 0.1~10 | 12.7% |
전극 종류 | 보조 코팅 조성물의 종류 | |
실시예 1 | 양극 | 제조예 1의 보조 코팅 조성물 |
실시예 2 | 음극 | 제조예 1의 보조 코팅 조성물 |
실시예 3 | 양극 | 제조예 2의 보조 코팅 조성물 |
실시예 4 | 음극 | 제조예 2의 보조 코팅 조성물 |
실시예 5 | 양극 | 제조예 3의 보조 코팅 조성물 |
비교예 1 | 음극 | 제조예 3의 보조 코팅 조성물 |
전극 종류 | 보조 코팅 조성물의 종류 | |
비교예 2 | 양극 | 제조예 1의 보조 코팅 조성물 |
비교예 3 | 음극 | 제조예 1의 보조 코팅 조성물 |
비교예 4 | 양극 | 제조예 3의 보조 코팅 조성물 |
비교예 5 | 음극 | 제조예 3의 보조 코팅 조성물 |
전극 합재층의 상하면의 길이 편차 (┃a-b┃) | 슬라이딩 각도 | |
실시예 1 | 0.8mm | 87° |
실시예 2 | 6.0mm | 83° |
실시예 3 | 1.2mm | 60° |
실시예 4 | 7.3mm | 60° |
실시예 5 | 4.5mm | 55° |
비교예 1 | 10.0mm | 60° |
비교예 2 | 8.5mm | 65° |
비교예 3 | 9.0mm | 60° |
비교예 4 | 12.0mm | 50° |
비교예 5 | 10.0mm | 55° |
Claims (17)
- 전극 집전체;상기 전극 집전체 상에 마련되고, 전극 활물질을 포함하는 전극 합재층; 및상기 전극 집전체 상에 마련되며, 전극 합재층의 단부에 위치하는 보조 코팅층을 포함하고,상기 전극 합재층은 전극 집전체와 맞닿는 면의 길이(a)와 전극 집전체와 맞닿지 않는 면의 길이(b)의 편차(┃a-b┃)가 8 mm 이하인 리튬 이차전지용 전극.
- 제1항에 있어서,보조 코팅층은 무기 입자, 페놀 화합물 및 바인더를 포함하는 리튬 이차전지용 전극.
- 제2항에 있어서,무기 입자는 뵘석(boehmite), 기브자이트(gibbsite), 다이어스포어(diaspore), 명반석(alunite) 및 하석(nepheline) 중 1종 이상의 알루미늄 광물을 포함하는 리튬 이차전지용 전극.
- 제2항에 있어서,페놀 화합물은 탄닌산(Tannic acid), 바이칼린(Baicalein), 루테올린(luteolin), 탁시폴린(Taxifolin), 미리세틴(Myricetin), 케르세틴(Quercetin), 루틴(Rutin), 카테킨(Catechin), 에피갈로카테킨 갈레이트(Epigallocatechin gallate), 뷰테인(Butein), 피세아테놀, 파이로갈릭산(Pyrogallic acid), 엘라직 산(Ellagic acid), 아밀로오스(Amylose), 아밀로펙틴(Amylopectin) 및 잔탄검(Xanthan gum) 중 1종 이상을 포함하는 리튬 이차전지용 전극.
- 제2항에 있어서,보조 코팅층은 전체 중량에 대하여 50 중량부 이상으로 무기 입자를 포함하는 리튬 이차전지용 전극.
- 제1항에 있어서,보조 코팅층은 전극 합재층의 단부 표면을 둘러싸는 구조로 전극 합재층과 하나의 층을 이루는 리튬 이차전지용 전극.
- 제1항에 있어서,보조 코팅층은 전극 합재층 평균 두께에 대하여 70% 내지 100% 비율의 두께를 갖는 리튬 이차전지용 전극.
- 제1항에 있어서,전극 합재층의 단부는 50° 이상의 경사각을 갖는 리튬 이차전지용 전극.
- 전극 집전체 상에 전극 활물질을 포함하는 전극 슬러리와 보조 코팅 조성물을 동시에 코팅하여 전극 활물질을 포함하는 전극 합재층의 단부에 보조 코팅층이 배치된 전극을 제조하는 단계를 포함하고,상기 전극 합재층은 전극 집전체와 맞닿는 면의 길이(a)와 전극 집전체와 맞닿지 않는 면의 길이(b)의 편차(┃a-b┃)가 8 mm 이하인 리튬 이차전지용 전극의 제조방법.
- 제9항에 있어서,보조 코팅 조성물은 무기 입자, 페놀 화합물 및 바인더를 포함하는 리튬 이차전지용 전극의 제조방법.
- 제10항에 있어서,무기 입자는 보조 코팅 조성물 전체 중량에 대하여 50 중량부 이상으로 포함되는 리튬 이차전지용 전극의 제조방법.
- 제10항에 있어서,페놀 화합물은 탄닌산(Tannic acid), 바이칼린(Baicalein), 루테올린(luteolin), 탁시폴린(Taxifolin), 미리세틴(Myricetin), 케르세틴(Quercetin), 루틴(Rutin), 카테킨(Catechin), 에피갈로카테킨 갈레이트(Epigallocatechin gallate), 뷰테인(Butein), 피세아테놀, 파이로갈릭산(Pyrogallic acid), 엘라직 산(Ellagic acid), 아밀로오스(Amylose), 아밀로펙틴(Amylopectin) 및 잔탄검(Xanthan gum) 중 1종 이상을 포함하는 리튬 이차전지용 전극의 제조방법.
- 제10항에 있어서,페놀 화합물은 전체 중량에 대하여 0.1 내지 5 중량부로 포함되는 리튬 이차전지용 전극.
- 제9항에 있어서,전극 슬러리와 보조 코팅 조성물의 코팅은 슬롯 다이에 의해 동시 토출되고,상기 슬롯 다이는 전극 슬러리를 수용하는 챔버를 갖는 상부 다이; 상기 상부 다이와 대향되는 하부 다이; 상기 상부 다이와 하부 다이 사이에 위치하고, 몸체에 챔버와 통하는 중공을 가지며, 상기 중공으로부터 전극 슬러리를 토출시키는 토출구가 마련된 플레이트 형상의 심(shim) 부재를 포함하되,상기 심 부재는 토출구의 양단부에 보조 코팅 조성물을 공급하는 공급홈을 포함하는 리튬 이차전지용 전극의 제조방법.
- 제14항에 있어서,심 부재는 몸체에 전극 슬러리가 분할 토출되도록 중공을 분할하는 격벽을 포함하고,상기 격벽은 분할 토출되는 각 전극 슬러리의 가장자리에 보조 코팅 조성물을 공급하는 공급홈을 구비하는 리튬 이차전지용 전극의 제조방법.
- 제15항에 있어서,공급 홈은 심 부재의 두께 방향으로 관통되는 관통부를 포함하고,상기 관통부는 보조 코팅 조성물이 토출되는 토출립에서 내측으로 소정의 길이만큼 형성되는 리튬 이차전지용 전극의 제조방법.
- 제16항에 있어서,심 부재의 토출구와 토출립은 토출구와 토출립이 마련된 상부 다이와 하부 다이의 일측면을 기준으로 내측에서 접하는 구조를 갖는 리튬 이차전지용 전극의 제조방법.
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US18/272,720 US20240088453A1 (en) | 2022-01-07 | 2022-12-22 | Electrode for lithium secondary battery and manufacturing method thereof |
JP2023543450A JP2024505452A (ja) | 2022-01-07 | 2022-12-22 | リチウム二次電池用電極およびその製造方法 |
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KR20220002814A (ko) | 2020-12-15 | 2022-01-07 | 베이징 바이두 넷컴 사이언스 테크놀로지 컴퍼니 리미티드 | 딥 모델 시각화 데이터의 처리 방법, 장치 및 전자 기기 |
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2022
- 2022-01-07 KR KR1020220002814A patent/KR20230106989A/ko unknown
- 2022-12-22 JP JP2023543450A patent/JP2024505452A/ja active Pending
- 2022-12-22 CN CN202280011323.3A patent/CN116802829A/zh active Pending
- 2022-12-22 US US18/272,720 patent/US20240088453A1/en active Pending
- 2022-12-22 EP EP22919068.1A patent/EP4266401A1/en active Pending
- 2022-12-22 WO PCT/KR2022/021021 patent/WO2023132531A1/ko active Application Filing
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KR20130024766A (ko) * | 2011-08-30 | 2013-03-08 | 가부시키가이샤 지에스 유아사 | 전극 및 전극의 제조 방법 |
JP5772397B2 (ja) * | 2011-08-30 | 2015-09-02 | 株式会社Gsユアサ | 電池用電極の製造方法及び電池用電極 |
WO2017163846A1 (ja) * | 2016-03-24 | 2017-09-28 | Necエナジーデバイス株式会社 | リチウムイオン二次電池、電極及びその製造方法 |
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KR20200049640A (ko) * | 2018-10-31 | 2020-05-08 | 도요타 지도샤(주) | 전극판, 이것을 이용한 전지, 전극판의 제조 방법, 이것을 이용한 전지의 제조 방법, 다이 헤드 |
KR102035826B1 (ko) * | 2019-05-31 | 2019-10-24 | 씨아이에스(주) | 다열 동시 코팅 슬롯다이 |
KR20220002814A (ko) | 2020-12-15 | 2022-01-07 | 베이징 바이두 넷컴 사이언스 테크놀로지 컴퍼니 리미티드 | 딥 모델 시각화 데이터의 처리 방법, 장치 및 전자 기기 |
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EP4266401A1 (en) | 2023-10-25 |
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US20240088453A1 (en) | 2024-03-14 |
JP2024505452A (ja) | 2024-02-06 |
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