WO2021210766A1 - 이차 전지용 전극 - Google Patents
이차 전지용 전극 Download PDFInfo
- Publication number
- WO2021210766A1 WO2021210766A1 PCT/KR2021/001339 KR2021001339W WO2021210766A1 WO 2021210766 A1 WO2021210766 A1 WO 2021210766A1 KR 2021001339 W KR2021001339 W KR 2021001339W WO 2021210766 A1 WO2021210766 A1 WO 2021210766A1
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- WIPO (PCT)
- Prior art keywords
- electrode
- line
- line portion
- current collector
- region
- Prior art date
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- 239000011149 active material Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims description 11
- 239000010410 layer Substances 0.000 description 88
- 239000011267 electrode slurry Substances 0.000 description 23
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 239000011247 coating layer Substances 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 8
- 239000012811 non-conductive material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000011530 conductive current collector Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/62—Insulating-layers or insulating-films on metal bodies
-
- 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
- H01M10/04—Construction or 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
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to an electrode for a secondary battery, and more particularly, to an electrode for a secondary battery that improves the rigidity of an end of an electrode current collector to which an electrode tab is attached.
- secondary batteries are of great interest not only as mobile devices such as mobile phones, digital cameras, notebooks, and wearable devices, but also as energy sources for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles.
- the secondary battery may be formed by inserting an electrode assembly including a positive electrode, a negative electrode, and a separator into a case and then sealing the electrode assembly.
- a positive electrode or a negative electrode (hereinafter referred to as "electrode plate”) is formed by coating an active material slurry to a predetermined thickness on a positive conductive current collector or a negative conductive current collector, respectively, and a separator is interposed between the positive conductive current collector and the negative conductive current collector
- An electrode assembly may be formed by winding a jelly roll a plurality of times or stacking it in a plurality of layers to make it possible.
- the electrode plate may be formed of an active material layer coated with an active material slurry and an uncoated area.
- the active material layer may include a rolling process to increase adhesion to the electrode current collector and increase the active material capacity density. After drying, the rolled electrode plate may be cut into a predetermined size by passing through a cutter having a predetermined width.
- an insulating member was coated on the uncoated portion of each electrode plate to solve a problem that a positive electrode current collector and a negative electrode and/or a negative current collector and a positive electrode contact each other and cause a short circuit due to the shrinkage of the separator at high temperature. .
- FIG. 1 is a diagram schematically showing an enlarged part of a conventional electrode.
- 2 and 3 are cross-sectional views taken along the cutting line A-A' of FIG. 1 .
- 3 is a view showing a structure in which a part of the electrode of FIG. 2 is folded or bent. It is a diagram showing a structure in which a part of an electrode is bent in a cross-sectional view.
- the electrode 1 includes an active material layer 20 coated with an active material on a current collector 10 , and an end of the active material layer 20 on the current collector 10 and An insulating layer 30 coated with an insulating material on a corresponding boundary may be included.
- the insulating layer 30 may be positioned adjacent to the interface where the end of the active material layer 20 is located, and the insulating layer 30 overlaps the end of the active material layer 20 depending on the type of the insulating coating solution. It can be positioned so that it occurs.
- the exposed area on which the active material layer 20 and the insulating layer 30 are not coated on the current collector 10 is adjacent to the end of the current collector. may be formed, and the exposed area may be folded or bent when the electrode 1 passes through the traveling roller as the subsequent process proceeds.
- the active material layer 20 and the insulating layer 30 on the current collector 10 the exposed area is not coated, an electrode tab (not shown) may be attached through a method such as welding according to a later process, In the subsequent process, the electrode tab attached to the exposed area, which is folded or bent when passing through the traveling roller, is more likely to be easily folded or disconnected, thereby increasing the defect rate and lowering productivity.
- An object of the present invention is to provide an electrode for a secondary battery that improves the rigidity of an electrode current collector portion to which an electrode tab is attached.
- An electrode for a secondary battery includes: an electrode current collector including a first region and a second region partitioned by a first boundary, wherein at least a portion of the second region is exposed; a first coating layer positioned on the first region of the electrode current collector and including an active material; and a second coating layer positioned in the second region of the electrode current collector but including an insulating material, wherein the second coating layer includes a first line portion, wherein the first line portion is positioned to correspond to the first boundary ,
- the second coating layer further includes at least one second line portion having a predetermined pattern, wherein the second line portion is spaced apart from the first line portion by a predetermined interval while corresponding to the first boundary.
- the first boundary may correspond to one end of the electrode current collector and one end of the first coating layer spaced apart by a predetermined distance.
- first line part and the at least one or more second line parts may be spaced apart from each other at the same distance.
- the at least one second line portion may have the same pattern as the first line portion.
- the at least one second line portion may have a different pattern from that of the first line portion, and a line connecting one end and the other end of the second line portion may be parallel to the second boundary.
- an electrode tab may be attached to at least a partial region of the second region.
- an electrode tab may be attached to a region exposed between the first line part and the at least two second line parts.
- the second coating layer may have a height equal to or smaller than that of the first coating layer.
- the second coating layer may further include at least one or more third line portions, and the at least one or more third line portions may be spaced apart from each other by a predetermined interval while corresponding to a second boundary perpendicular to the first boundary.
- the at least one or more third line parts may be spaced apart from each other at the same distance.
- the at least one or more third line portions may have the same pattern as the first line portion.
- the at least one third line portion may have a different pattern from the first line portion, and a line connecting one end and the other end of the third line portion may be parallel to the second boundary.
- the at least one or more second line portions and the at least one or more third line portions may have different thicknesses.
- the rigidity of the exposed region of the electrode current collector may be increased by the pattern of the insulating layer.
- the exposed region is a portion to which the electrode tab is attached, and prevents disconnection due to bending or folding of the electrode tab during the electrode manufacturing process, thereby reducing the defect rate and increasing productivity.
- FIG. 1 is a diagram schematically showing an enlarged part of a conventional electrode.
- FIG. 2 and 3 are cross-sectional views taken along the cutting line A-A' of FIG. 1 .
- FIG. 3 is a view showing a structure in which a part of the electrode of FIG. 2 is folded or bent.
- FIG. 4 is a plan view illustrating an electrode for a secondary battery according to an embodiment of the present invention.
- FIG. 5 is a cross-sectional view taken along the cutting line B-B' of FIG. 4 .
- FIG. 6 is a plan view illustrating an electrode for a secondary battery according to another embodiment of the present invention.
- FIG. 7 is a cross-sectional view taken along the cutting line C-C' of FIG. 6 .
- FIG. 8 is a cross-sectional view taken along the cutting line D-D' of FIG. 6 .
- planar it means when the target part is viewed from above, and "in cross-section” means when viewed from the side when a cross-section of the target part is vertically cut.
- an electrode for a secondary battery according to an embodiment of the present invention will be described.
- the electrode will be described with reference to the upper surface of the upper and lower surfaces of the current collector, but the present invention is not limited thereto, and the same or similar contents may be described in the case of the lower surface.
- FIG. 4 is a plan view illustrating an electrode for a secondary battery according to an embodiment of the present invention.
- 5 is a cross-sectional view taken along the cutting line B-B' of FIG. 4 .
- the electrode 100 for a secondary battery includes an electrode current collector 110 , an active material layer 120 , and an insulating layer 130 .
- the electrode current collector 110 includes a first region in which the active material layer 120 is formed and a second region not covered by the active material layer 120 .
- the active material layer 120 is formed by coating the electrode slurry on the electrode current collector 110 .
- the insulating layer 130 may be formed in an exposed region where the active material layer 120 is not coated in the electrode current collector 110 . In this case, the insulating layer 130 may be formed by coating an insulating solution in a region where the active material layer 120 is not formed.
- the end of the electrode 100 may be cut to a predetermined size and shape to attach an electrode tab in a subsequent process, and in particular, the insulating layer 130 on the electrode current collector 110 as shown in FIGS. 4 and 5 . ) located at the end (position indicated by A) may be cut to a predetermined size and shape.
- the sizes and shapes shown in FIGS. 4 and 5 are merely exemplary, and other sizes and shapes suitable for attaching the electrode tabs may also be applied.
- each configuration of the electrode 100 for a secondary battery according to an embodiment of the present application will be described in detail.
- the electrode 100 will be described based on the case of the anode, but is not necessarily limited thereto, and the same or similar contents may be described in the case of the cathode.
- the active material layer 120 may be formed as the electrode slurry is coated on the electrode current collector 110 .
- the active material layer 120 may be formed as the electrode slurry is coated on one region of the electrode current collector 110 so as to have a region to which the electrode current collector 110 is exposed.
- the active material layer 120 may be formed as the electrode slurry is coated on one of the regions partitioned by the first boundary B1 parallel to one end of the electrode current collector 110, and the electrode slurry is not coated. Silver may be a region to which the electrode current collector 110 is exposed.
- the electrode current collector 110 may have an exposed region on which the electrode slurry is not coated, and the exposed region may include an uncoated region 115 where an electrode tab is to be formed.
- the insulating layer 130 is a region on the electrode current collector 110 that is not coated with the electrode slurry, and may be a region in which an insulating solution is coated on a portion of the region where the electrode current collector 110 is exposed. .
- the insulating layer 130 may be a region coated with an insulating solution adjacent to the active material layer 120 in the region where the electrode current collector 110 is exposed.
- the insulating layer 130 includes at least two line portions 131 and 135 .
- the first line part 131 and the second line part 135 are coated with an insulating solution along a predetermined line in a portion of the region where the electrode current collector 110 is exposed. may be a part of
- a region in which an insulating solution is not coated with respect to a portion of the exposed region of the electrode current collector 110 may include the uncoated region 115 where the electrode tab is to be formed.
- the first line part 131 may be disposed adjacent to one end of the active material layer 120 .
- the first line portion 131 may be a portion formed by coating an insulating solution so as to be in contact with one end of the active material layer 120 or to be spaced apart from each other by a predetermined distance.
- the second line part 135 may be disposed to be spaced apart from the first line part 131 .
- the second line part 135 may have a structure extending parallel to the first line part 131 .
- the first line part 131 and the second line part 135 also show a straight line part, but the present invention is not limited thereto.
- the predetermined pattern may be a curved line, a hatched line, a dashed line, a dotted line, or the like.
- first line part 131 and the second line part 135 may have different patterns.
- a line connecting one end and the other end of the second line unit 135 may be parallel to the first line unit 131 .
- the second line portion 135 may be a coated region to have the same or different thickness as the first line portion 131 .
- first line portion 131 and the second line portion 135 included in the insulating layer 130 may be coated regions to have the same or smaller height compared to the active material layer 120 , respectively.
- the first line portion 131 and the second line portion 135 included in the insulating layer 130 may have the same height, but may be a coated region to have a height equal to or smaller than that of the active material layer 120 . .
- the insulating layer 130 has a greater height than the active material layer 120 , the insulating layer 130 or a portion where the insulating layer 130 and the active material layer 120 overlap may protrude, thereby affecting the final cell appearance.
- the exposed area on which the electrode slurry is not coated may be bent or folded.
- the electrode 100 as the insulating layer 130 further includes the second line portion 135 as well as the first line portion 131 closest to the active material layer 120 , the electrode In the current collector 110 , the rigidity of the exposed region on which the electrode slurry is not coated may be increased. Accordingly, the exposed area on which the electrode slurry is not coated in the electrode current collector 110 may not be easily bent or folded.
- the area of the uncoated area 115 may be reduced compared to the conventional electrode, so that the electrode is placed on the uncoated area 115 included in the exposed area on which the electrode slurry is not coated in the electrode current collector 110 . Even if the tab is formed, it may not be bent or folded easily. That is, through this, the electrode 100 according to an embodiment of the present invention is expected to have a complex effect of preventing short circuit, which is the basic effect of the insulating layer 130 , and preventing disconnection, improving battery life and increasing productivity. can be
- the insulating solution coated on the insulating layer 130 is a non-conductive material, and the insulating layer 130 may be formed by coating and drying the insulating solution.
- the insulating liquid is not particularly limited as long as it is a non-conductive material without causing a chemical change in the secondary battery using the electrode according to the present embodiment.
- the first line part 131 and the second line part 135 may include a non-conductive material, but may include the same or different non-conductive material.
- the viscosity of the insulating solution may be adjusted in order to reduce the degree to which the insulating solution and the materials forming the electrode slurry are mixed by diffusion.
- the first line part 131 and the second line part 135 may be coated with an insulating liquid having the same viscosity.
- the first line portion 131 may be positioned adjacent to the active material layer 120 coated with the electrode slurry, so that the viscosity may be adjusted to be high, whereas the second line portion 135 may have a low viscosity.
- the insulating layer 130 may prevent the electrode current collector 110 and an electrode having a different polarity from contacting with the electrode having a different polarity to cause a short circuit due to the contraction of the separator that occurs when the secondary battery is used at a high temperature.
- the insulating layer 130 may increase the stability of the battery cell by preventing the short circuit as described above.
- the electrode manufacturing method includes the steps of forming the active material layer 120 by coating the electrode slurry on the electrode current collector 110 while rolling the electrode current collector 110 .
- the method may include forming the insulating layer 130 by coating an insulating solution on an exposed region where the electrode slurry is not coated on the electrode current collector 110 .
- the forming of the insulating layer 130 may be performed after the electrode slurry of the active material layer 120 is completely dried.
- forming the insulating layer 130 may include drying the insulating liquid.
- FIG. 6 is a plan view illustrating an electrode for a secondary battery according to another embodiment of the present invention.
- 7 is a cross-sectional view taken along the cutting line C-C' of FIG. 6 .
- 8 is a cross-sectional view taken along the cutting line D-D' of FIG. 6 .
- FIGS. 4 and 5 since there are some overlapping contents with those described in FIGS. 4 and 5 , different features will be mainly described in detail.
- the electrode 200 for a secondary battery includes an electrode current collector 210 , an active material layer 220 , and an insulating layer 230 .
- the electrode current collector 210 and the active material layer 220 are the same as those described above, and will be omitted below.
- a region in which an insulating solution is not coated with respect to a portion of the exposed region of the electrode current collector 210 may include the uncoated region 215 where the electrode tab is to be formed.
- the uncoated region 215 may be an exposed region of the electrode current collector 210 deviated from an end of the insulating layer 230 positioned in a direction away from the active material layer 220 .
- the insulating layer 130 may include at least one line portion, but may be a region in which an insulating solution is coated to have a predetermined pattern on some of the exposed regions of the electrode current collector 110 .
- the insulating layer 230 includes at least two line portions, and the line portions may include a first line portion 231 and a second line portion 235 , and additionally a third line portion 239 . ) may be included.
- the descriptions of the first line part 231 and the second line part 235 are the same as those described above, and will be omitted below.
- the third line part 239 may include at least one line part extending in a direction crossing the first line part 231 and/or the second line part 235 .
- the third line part 239 may include at least two or more line parts extending in a direction crossing the first line part 231 and/or the second line part 235 , and the at least two or more line parts may have a predetermined predetermined value. may be spaced apart from each other at intervals.
- the third line part 239 may have the same pattern as the first line part 231 or the second line part 235 .
- the third line part 239 includes at least one or more line parts extending in a direction crossing the first line part 231 and/or the second line part 235 , and at least two or more line parts have a predetermined pattern.
- the predetermined pattern may be a straight line, a curved line, a hatched line, a dashed line, a dotted line, or the like. 6 to 8, for convenience of explanation, a predetermined pattern is indicated by a straight line.
- the first line part 231 , the second line part 235 , and the third line part 239 may form a grid pattern according to a predetermined pattern on the exposed area of the electrode current collector 210 .
- the third line part 239 has a pattern different from that of the first line part 231 and/or the second line part 235
- the line connecting one end and the other end of the third line part 239 is It may be perpendicular to the first line part 231 and/or the second line part 235 .
- the third line portion 239 may be a coated region to have the same or different thickness as the first line portion 231 and/or the second line portion 235 .
- the third line portions 239 included in the insulating layer 230 may be coated regions to have the same or smaller height than the active material layer 220 , respectively.
- the first line portion 231 , the second line portion 235 , and the third line portion 239 included in the insulating layer 230 have the same height, but are equal to or smaller than the active material layer 220 . It may be an area coated to have a height.
- the insulating layer 230 has a greater height than the active material layer 220 , the insulating layer 230 or a portion where the insulating layer 230 and the active material layer 220 overlap may protrude, thereby affecting the final cell appearance.
- the exposed area on which the electrode slurry is not coated may be bent or folded.
- the insulating solution coated on the insulating layer 230 is a non-conductive material, and the insulating layer 230 may be formed by coating and drying the insulating solution.
- the insulating liquid is not particularly limited as long as it is a non-conductive material without causing a chemical change in the battery using the electrode according to the present embodiment.
- the first line part 231 , the second line part 235 , and the third line part 239 may include a non-conductive material, but may include the same or different non-conductive material.
- the viscosity of the insulating solution may be adjusted in order to reduce the degree to which the insulating solution and the materials forming the electrode slurry are mixed by diffusion.
- first line portion 231 to the third line portion 239 may be coated with an insulating liquid having the same viscosity.
- the first line portion 231 is positioned adjacent to the active material layer 220 coated with the electrode slurry, so that the viscosity can be adjusted to be high.
- the second line portion 235 and the third line portion 239 can be adjusted to have a low viscosity.
- the insulating layer 230 includes not only the first line portion 231 adjacent to the active material layer 220 , but also the second line portion 235 and the third line portion 239 .
- the rigidity of the exposed region on which the electrode slurry is not coated in the electrode current collector 210 may be increased.
- the insulating layer 230 is not only the first line portion 231 adjacent to the active material layer 220 , but also the second line portion 235 and the third line portion.
- the exposed area on which the electrode slurry is not coated in the electrode current collector 210 may not be easily bent or folded.
- the insulating layer 130 is adjacent to the active material layer 220 and the first line portion 231 as well as the second line portion 235 and the third line portion.
- the area of the uncoated region 215 may be reduced compared to the conventional electrode, so that even if the electrode tab is formed in the exposed area where the electrode slurry is not coated in the electrode current collector 210, it is not easily bent or folded. may not be That is, through this, the electrode 200 according to an embodiment of the present application can be expected to have a combined effect of preventing short circuit, which is a basic effect of the insulating layer 230 , and preventing disconnection and increasing the lifespan of the battery. In addition, through this, the electrode 200 according to an embodiment of the present application can increase productivity by reducing defects such as disconnection that may occur in a subsequent process.
- one of the first line part 231 and the second line part 235 may be omitted.
- one of the first line part 231 and the second line part 235 and the third line part 239 may also form a grid pattern.
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims (11)
- 제1 영역과 제2 영역을 포함하는 전극 집전체,상기 전극 집전체의 제1 영역 상에 위치하는 활물질층, 및상기 전극 집전체의 제2 영역 상에 위치하는 절연층을 포함하고,상기 절연층은 적어도 2개의 라인부를 포함하는 이차 전지용 전극.
- 제1항에 있어서,상기 제1 영역과 상기 제2 영역을 구획하는 제1 경계는 상기 활물질층의 일단부와 대응되고, 상기 제1 라인부 및 상기 제2 라인부는 서로 동일한 간격으로 이격되어 있는 이차 전지용 전극.
- 제1항에 있어서,상기 제2 라인부는 상기 제1 라인부와 동일한 패턴을 가지는 이차 전지용 전극.
- 제1항에 있어서,상기 제1 라인부와 상기 제2 라인부는 서로 상이한 패턴을 갖고,상기 제2 라인부의 일단 및 타단을 연결한 선은 상기 제1 라인부와 평행한 이차 전지용 전극.
- 제1항에 있어서,상기 제2 영역 중 적어도 일부 영역에 전극 탭이 부착되는 이차 전지용 전극.
- 제1항에 있어서,상기 절연층은 상기 활물질층 대비하여 동일하거나 작은 높이를 갖는 이차 전지용 전극.
- 제1항에 있어서,상기 절연층은 제3 라인부를 더 포함하고,상기 제3 라인부는 상기 라인부와 교차하는 이차 전지용 전극.
- 제7항에 있어서,상기 적어도 하나 이상의 제3 라인부는 서로 동일한 간격으로 이격되어 있는 이차 전지용 전극.
- 제7항에 있어서,상기 제3 라인부는 상기 제1 라인부와 동일한 패턴을 가지는 이차 전지용 전극.
- 제7항에 있어서,상기 제3 라인부는 상기 제1 라인부와 상이한 패턴을 가지되,상기 제3 라인부의 일단 및 타단을 연결한 선이 상기 제2 경계와 평행한 이차 전지용 전극.
- 제7항에 있어서,상기 제2 라인부와 상기 제3 라인부가 서로 상이한 두께를 가지는 이차 전지용 전극.
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JP2022544389A JP7391461B2 (ja) | 2020-04-16 | 2021-02-02 | 二次電池用電極 |
EP21788363.6A EP4092823A4 (en) | 2020-04-16 | 2021-02-02 | ELECTRODE OF A SECONDARY BATTERY |
US17/909,053 US20230092071A1 (en) | 2020-04-16 | 2021-02-02 | Secondary Battery Electrode |
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CN115088131B (zh) | 2024-10-01 |
JP7391461B2 (ja) | 2023-12-05 |
KR20210128123A (ko) | 2021-10-26 |
JP2023511180A (ja) | 2023-03-16 |
CN115088131A (zh) | 2022-09-20 |
EP4092823A1 (en) | 2022-11-23 |
EP4092823A4 (en) | 2024-07-24 |
US20230092071A1 (en) | 2023-03-23 |
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