WO2023075319A1 - 이차 전지용 전극의 제조방법, 이차 전지용 전극, 및 상기 방법에 사용되는 전극 제조 시스템 - Google Patents
이차 전지용 전극의 제조방법, 이차 전지용 전극, 및 상기 방법에 사용되는 전극 제조 시스템 Download PDFInfo
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- WO2023075319A1 WO2023075319A1 PCT/KR2022/016216 KR2022016216W WO2023075319A1 WO 2023075319 A1 WO2023075319 A1 WO 2023075319A1 KR 2022016216 W KR2022016216 W KR 2022016216W WO 2023075319 A1 WO2023075319 A1 WO 2023075319A1
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- WIPO (PCT)
- Prior art keywords
- electrode
- insulating layer
- secondary battery
- laser
- current collector
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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
- 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
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
- B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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 a method for manufacturing an electrode for a secondary battery, an electrode for a secondary battery, and an electrode manufacturing system used in the method.
- lithium secondary batteries having high energy density and discharge voltage are commercialized and widely used.
- lithium secondary batteries there is a demand for prismatic secondary batteries and pouch-type secondary batteries that can be applied to mobile phones and automobiles in terms of the shape of the battery, and in terms of materials, lithium ion batteries with high energy density, discharge voltage, and output stability, lithium There is a high demand for lithium secondary batteries such as ion polymer batteries.
- Lithium secondary batteries are also classified according to the structure of the electrode assembly of the cathode/separator/cathode structure. Specifically, a jelly-roll (wound type) electrode assembly having a structure in which long sheet-type positive electrodes and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive electrodes and negative electrodes cut in units of a predetermined size with a separator interposed therebetween Stacked (stacked) electrode assemblies sequentially stacked, bi-cells or full cells in which positive and negative electrodes in predetermined units are stacked with a separator interposed therebetween are stacked/folded electrodes Assemblies and the like are known.
- a pouch type battery having a structure in which a stack type or stack/fold type electrode assembly is embedded in a pouch type battery case of an aluminum laminate sheet has attracted much attention due to low manufacturing cost, low weight, easy shape deformation, etc. Usage is also gradually increasing.
- the present inventors applied a laser cutting method while studying an efficient notching process of an electrode tab in which an insulating layer was stacked.
- the line width of the incision line by the laser is very narrow, re-fusion of the melted insulation layer after cutting, dross generation when separating the re-fusion portion, defective electrode tab profile due to re-fusion, melting and curling of the insulation layer
- the insulating layer was lifted (or widened) due to development, and a problem in which a part of the current collector was exposed due to the insulating layer lifted occurred.
- the present inventors have made diligent efforts to solve the above problems, and have found a method capable of preventing the occurrence of the above problems by minimizing the melting of the insulating layer during cutting, thereby completing the present invention.
- An object of the present invention is to provide a method for manufacturing an electrode for a secondary battery capable of manufacturing an electrode including an electrode tab on which an insulating layer is stacked with excellent efficiency and excellent quality by using a specific laser.
- an object of the present invention is to provide an electrode manufacturing system used in the method.
- the notching is performed using a laser having a pulse width of 100 ps to 10 -6 ps.
- It includes a laser cut electrode tab cut in a state in which an insulating layer and a current collector are laminated
- an electrode for a secondary battery in which the thickness of the cut end surface of the electrode tab is 1 to 1.7 times the thickness before cutting.
- It includes a laser cut electrode tab cut in a state in which an insulating layer and a current collector are laminated
- an electrode for a secondary battery in which a length of a current collector protruding from a cutting edge of the electrode tab based on a front end of the insulating layer is less than 20 ⁇ m.
- an electrode sheet supplying device including a current collector divided into a holding part and a non-coated part, and supplying an electrode sheet in which an insulating layer is laminated to the uncoated part;
- a laser beam irradiation device having a pulse width of 100 ps to 10 ⁇ 6 ps to form an electrode tab by notching the uncoated portion where the insulating layer is stacked;
- It provides an electrode manufacturing system including a jig for supporting the laser beam irradiation part for the electrode sheet from a lower surface.
- a laser having a pulse width of 100 ps to 10 -6 ps is applied to a notching process of an electrode tab in which an insulating layer is stacked, so that after cutting, the insulating layer is re-fused and the re-fused portion is separated. It prevents problems such as occurrence of dross, defective electrode tab profile due to re-fusion, lifting (or widening) of the insulating layer due to melting and curling of the insulating layer, and exposure of the current collector due to the lifting of the insulating layer, so that the electrode It provides an effect of greatly improving manufacturing efficiency and quality of electrodes.
- the electrode of the present invention provides an excellent insulating layer-laminated electrode tab profile, thereby providing an effect of improving the stability and reliability of the battery.
- the electrode manufacturing system of the present invention provides an electrode manufacturing system capable of efficiently performing the above method.
- FIG. 1 is a partial cross-sectional view of a battery structure in which electrodes including electrode tabs in which insulating layers are laminated are stacked;
- FIG. 2 is a plan view showing the form of an electrode sheet in a step before the electrode tab notching process in the process of manufacturing an electrode in which an insulating layer is laminated on an electrode tab;
- FIG. 3 is an enlarged view of part A of Figure 2
- Figure 4 is a diagram visually showing the characteristics of the laser used in the present invention.
- Figure 5 is a graph showing the peak power according to the pulse width of the laser
- FIG. 6 is a diagram schematically showing an electrode manufacturing system according to an embodiment of the present invention.
- FIG. 7 is a photograph of a state in which an insulating layer is spread on a cut surface when an insulating layer-stacked electrode tab is cut using a nanosecond laser;
- FIG. 8 is a photograph showing a state in which dross in the form of a thread is generated on a cut surface when an insulating layer-stacked electrode tab is cut using a mold.
- the notching is characterized in that it is performed using a laser having a pulse width of 100 ps to 10 ⁇ 6 ps.
- the pulse width may be selected from, for example, a range of picoseconds, femtoseconds, and the like, and may be used in a range of 100 ps to 100 fs.
- the efficiency of the notching process and the quality of the notched electrode tab are greatly deteriorated due to the melting of the insulating layer. That is, when a conventional laser using the heat absorption of the cutting medium and the subsequent cutting mechanism of the medium is applied to the notching of the insulating layer-stacked electrode tab, the characteristics of laser cutting with a very narrow line width of the cutting line and the laser wavelength are absorbed and melted. While the characteristics of the insulating layer being cut act together, a problem occurs in that the molten insulating layer is fused again during cutting.
- the profile of the cut surface becomes bumpy, and dross such as the molten insulation is lumpy, and the melting and curling of the insulation layer causes the insulation layer to Lifting (or widening) occurs, and a problem in that a part of the current collector is exposed due to the lifting phenomenon also occurs.
- the profile of the cross section of the electrode tab shows a high defect rate.
- the present invention is characterized by using a laser having a pulse width of 100 ps to 10 ⁇ 6 ps in order to solve the above problems.
- the above problem occurs even when a pulse laser as well as a continuous wave (cw) laser conventionally used in a notching process is used.
- a laser having a pulse width of 100 ps to 10 ⁇ 6 ps among pulse lasers it seems that the above problems can be avoided, and an effect of greatly improving the notching speed is obtained. That is, even when a nanosecond laser outside the scope of the present invention is used, a problem due to melting of the insulating layer occurs, but when a laser having a pulse width of picosecond or less (pulse width of 100 ps or less) is used, the above The same problem does not occur.
- a laser having a pulse width of 10 ps to 10 ⁇ 3 ps or 5 ps to 10 ⁇ 1 ps may be efficiently used. This is because, since the desired effect can be obtained in the present invention even if the pulse width is not smaller, a laser having a pulse width in the above range can be practical considering cost and the like.
- IR infrared
- UV ultraviolet
- green wavelength light may be used for the laser
- IR may be preferably used considering the stability and usability of the laser.
- the laser may have an average output energy of 10W to 200W at an average traveling speed of 100 mm/s to 2,000 mm/s, and 20W to 20W at 500 mm/s to 1,500 mm/s 150W may be used, and 50W to 100W based on 1,000 mm/s may be used.
- the average traveling (cutting) speed during the notching may be 100 mm/s to 2,000 mm/s, and 500 mm/s to 1,500 mm/s may be preferable in terms of notching efficiency. .
- the laser average power energy and average traveling speed are examples of one embodiment of the present invention, but the present invention is not limited thereto.
- the average power may be properly changed according to the environment such as the configuration of the laser optical system and the light collecting ability of the lens, and the average running speed may be appropriately changed according to the environment such as the shape of the notching object.
- the insulating layer may include a polymer resin.
- the insulating layer includes boehmite (AlO(OH)), Al 2 O 3 , ⁇ -AlOOH, Al(OH) 3, Mg(OH) 2 , Ti(OH) 4 , MgO, CaO, Cr 2 O 3 , MnO 2 , Fe 2 O 3 , Co 3 O 4 , NiO, ZrO 2 , BaTiO 3 , SnO 2 , CeO 2 , Y 2 O 3 , SiO 2 , silicon carbide (SiC), boron nitride (BN ) It may further include one or more inorganic particles selected from the group consisting of the like.
- one or more insulating layer materials used in this field may be further included in addition to the above components.
- the weight ratio of the polymer (binder) and the non-fat particles included in the insulating layer may be 5:95 to 99:1, 5:95 to 50:50, or 10:90 to 50:50. .
- polymer resin examples include styrene-butadiene rubber, acrylate styrene-butadiene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene-styrene rubber, acrylic rubber, butyl rubber, fluoro rubber, polyvinylidene fluoride, Polytetrafluoroethylene, polyethylene, polypropylene, ethylene propylene copolymer, polyethylene oxide, polyvinylpyrrolidone, polyepicrohydrin, polyphosphazene, polyacrylonitrile, polystyrene, ethylenepropylenediene copolymer from the group consisting of polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, acrylic resin, phenol resin, epoxy resin, polyvinyl alcohol, hydroxypropylmethylcellulose, hydroxypropylcellulose, diacetylcellulose, etc. One or more selected species may be used.
- the electrode sheet may or may not have an active material laminated on the holding portion.
- the active material is used in a laminated state, but is not limited thereto.
- the electrode may be an anode or a cathode.
- the current collector used for the anode or cathode may be a foil made of copper, aluminum, gold, nickel, copper alloy, or a combination thereof, but is not limited thereto.
- the electrode may be an anode, and an aluminum (Al) foil may be used as a current collector.
- It includes a laser cut electrode tab cut in a state in which an insulating layer and a current collector are laminated
- It relates to an electrode for a secondary battery in which the thickness of the cut end surface of the electrode tab is 1 to 1.7 times the thickness before cutting.
- the laser may be a laser having a pulse width of 100 ps to 10 ⁇ 6 ps.
- the electrode of the present invention has the feature of minimizing the lifting (or widening) of the insulating layer by solving the above problems.
- the thickness of the cutting section of the electrode tab may be 1 to 1.6 times the thickness before cutting. Also, the lower limit may be 1.1 times, 1.2 times, 1.3 times, 1.4 times, or 1.5 times.
- the cut cross section of the electrode tab of the present invention does not include dross in the form of yarn that inevitably occurs during mold cutting.
- It includes a laser cut electrode tab cut in a state in which an insulating layer and a current collector are laminated
- It relates to a secondary battery electrode in which the length of a current collector protruding from the cutting end of the electrode tab based on the front end of the insulating layer is less than 20 ⁇ m.
- the laser may be a laser having a pulse width of 100 ps to 10 ⁇ 6 ps.
- the insulating layer absorbs laser wavelength and is cut while being melted, as shown in FIG. And the lifting (or spreading) of the insulating layer due to the curling phenomenon occurs very greatly. In addition, the occurrence of such a lifting phenomenon causes exposure of the current collector. The exposed current collector causes a short circuit or the like, resulting in battery failure.
- the electrode of the present invention is characterized by minimizing the exposure of the current collector by solving the above problems.
- the length of the protruding current collector may have an upper limit of less than 18 ⁇ m and less than 16 ⁇ m.
- the lower limit may be 0, 1 ⁇ m, 3 ⁇ m, 5 ⁇ m, 10 ⁇ m, 12 ⁇ m, or 15 ⁇ m.
- the cut cross section of the electrode tab of the present invention does not include dross in the form of yarn that inevitably occurs during mold cutting.
- an electrode sheet supplying device 200 including a current collector divided into a holding part and a non-coating part, and supplying an electrode sheet 10 in which an insulating layer 11 is laminated to the uncoated part 12. );
- a laser beam irradiation device 300 having a pulse width of 100 ps to 10 ⁇ 6 ps to form an electrode tab by notching the uncoated portion where the insulating layer 11 is stacked;
- It relates to an electrode manufacturing system including a jig 400 supporting a laser beam irradiation part for the electrode sheet from a lower surface.
- the system of the present invention can be applied to all of the information related to the manufacturing method of the electrode described above. Therefore, descriptions of overlapping contents will be omitted below.
- the electrode sheet supply device 200 may be a roll-to-roll device.
- the roll-to-roll device may have the form shown in FIG. 8, and may further include an unwinding roll and a rewinding roll on both sides as a configuration not shown in FIG. 8.
- the laser beam irradiation device 300 is the same as a general laser device that can be purchased on the market except that it is a device for irradiating a laser beam having a pulse width of 100 ps to 10 ⁇ 6 ps. can have a configuration.
- the laser beam irradiation device 300 may include a laser source generator, a delivery mirror, a laser beam width controller, and a scanner unit, and the scanner may include a galvano mirror, a theta A lens (eg, ftheta lens) and the like may be included.
- the scanner may include a galvano mirror, a theta A lens (eg, ftheta lens) and the like may be included.
- the structure of the jig 400 is not particularly limited as long as it can support the laser beam irradiation part for the electrode sheet on its lower surface.
- a device designed to support an electrode sheet while rotating a plurality of electrode sheet supporting parts 410 may also be used.
- the insulating layer was laminated with a composition in which boehmite and SBS were mixed in a weight ratio of 6:4.
- An electrode tab was formed by performing a notching process on the uncoated portion of the electrode sheet on which the insulating layer was laminated using a laser device having a picosecond pulse width under the conditions shown in Table 1 below.
- the black portion is the background when photographing with an optical microscope, and the boundary line of the black portion is the cut portion of the electrode tab in which the insulating layer and the current collector are stacked. Since the drawing is a plan view image, the upper insulating layer of the electrode tab is shown, and the current collector positioned under the insulating layer is not exposed or protruded through the cut portion, so it is not visible in the image.
- the electrode manufactured by the picosecond laser of the present invention has a very excellent cutting profile of the electrode tab in which the insulating layer and the current collector are stacked, and the problems caused by the re-fusion of the insulating layer and the melting of the insulating layer are very good. It was confirmed that the current collector exposure problem did not occur at all.
- An electrode tab was manufactured by performing the notching process in the same manner as in the above embodiment, except that electrode tab notching was performed using a laser having a nanosecond pulse width under the conditions of Table 2 below. A photograph of the cut portion of the electrode tab is shown in Table 2 below.
- the drawings in Table 2 are optical micrographs obtained by photographing after nanosecond laser cutting in a state where the cut portion was not completely cut or the removed portion could not be removed due to re-fusion. Since the image corresponds to a plan view, the upper insulating layer and the cut portion of the electrode tab in which the insulating layer and the current collector are stacked are mainly shown, and in Comparative Examples 1 and 2, the current collector is partially exposed due to melting of the insulating layer. (The shiny part in the center) is confirmed.
- Comparative Example 1 it was confirmed that re-fusion of the insulating layer occurred entirely after cutting, and it was confirmed that the current collector was partially exposed due to the melting of the insulating layer.
- Comparative Example 2 it was confirmed that re-fusion of the insulating layer partially occurred after cutting, and the white part in the middle was confirmed as a portion where uncutting occurred as the insulation was melted during cutting and then fused and hardened again. In addition, it is confirmed that the current collector is partially exposed (shiny part) due to melting of the insulating layer.
- the insulating layer was laminated with a composition in which boehmite and SBS were mixed in a weight ratio of 5:5.
- An electrode tab was formed by performing a notching process on the uncoated portion of the electrode sheet on which the insulating layer was laminated using a laser device having a nanosecond pulse width under the conditions shown in Table 3 below.
- the upper part of the flat picture (round part and straight part) shown in black is the background when photographing with an optical microscope, and the lower part is the upper insulating layer part of the electrode tab in which the insulating layer and the current collector are stacked.
- the boundary line of the black portion is the cut portion of the electrode tab.
- the sandwich shape in the center of the cross-sectional photograph is a cut surface of an electrode tab in which an insulating layer and a current collector are stacked, and the remaining portion is a background portion when photographed under an optical microscope.
- the cut end is bumpy, the current collector protrudes to the outside (a light-colored part adjacent to the background), and the thickness of the cut surface in the cross-sectional photograph is about 200 ⁇ m compared to the thickness before cutting (45 ⁇ m). It can be seen that it is very thick. The reason for the increase in the thickness is that the insulation layer absorbs heat and melts when irradiated with a nanosecond laser and is separated from the current collector and rolled outward (see FIG. 7). The current collector exposed in this way may deteriorate stability of battery quality such as short circuit and low voltage.
- the insulating layer was laminated with a composition in which boehmite and PVDF were mixed in a weight ratio of 88:12.
- a notching process was performed on the uncoated portion of the electrode sheet on which the insulating layer was laminated under the conditions shown in Table 4 below using a laser device having a picosecond pulse width (Example 4) or a laser device having a picosecond pulse width (Comparative Example 8). This was carried out to form a positive electrode tab.
- the upper part of the flat picture (round part and straight part) shown in black is the background when photographing with an optical microscope, and the lower part is the upper insulating layer part of the electrode tab in which the insulating layer and the current collector are stacked.
- the boundary line of the black portion is the cut portion of the electrode tab.
- the sandwich shape in the center of the cross-sectional photograph is a cut surface of an electrode tab in which an insulating layer and a current collector are stacked, and the remaining portion is a background portion when photographed under an optical microscope.
- the electrode tab in which the insulating layer and the current collector are stacked with the picosecond laser notched of Example 4 has a very excellent cutting profile, and no problem due to re-fusion of the insulating layer has occurred. Confirmed. In addition, it was confirmed that exposure of the current collector due to melting of the insulating layer was minimized to 0 (round portion) and 15.83 ⁇ m (straight portion).
- the thickness of the cut surface was 69.25 ⁇ m, and it was confirmed that the increase in thickness was minimized compared to the thickness before cutting (45 ⁇ m).
- the electrode tab of Comparative Example 8 in which the insulating layer and the current collector are stacked with the nanosecond laser notched has an uneven cutting profile, and the exposure of the current collector by melting the insulating layer is 49.68 ⁇ m (round portion) and 23.02 ⁇ m (straight portion), respectively. found to be large.
- the thickness of the cut surface is 82.71 ⁇ m, and the thickness increase is significantly increased compared to the thickness before cutting (45 ⁇ m).
- the reason for the increase in the thickness is that the insulation layer absorbs heat and melts when irradiated with a nanosecond laser and is separated from the current collector and rolled outward (see FIG. 7).
- the stability of battery quality such as short circuit and low voltage may be deteriorated.
- the upper part of the flat picture (round part and straight part) shown in black is the background when photographing with an optical microscope, and the lower part is the upper insulating layer part of the electrode tab in which the insulating layer and the current collector are stacked.
- the boundary line of the black portion is the cut portion of the electrode tab.
- the sandwich shape in the center of the cross-sectional photograph is a cut surface of an electrode tab in which an insulating layer and a current collector are stacked, and the remaining portion is a background portion when photographed under an optical microscope.
- the thickness of the cut surface was 71.00 ⁇ m, and it was confirmed that the increase in thickness was minimized compared to the thickness before cutting (45 ⁇ m).
- electrode sheet 11 insulating layer
- electrode sheet supply device 210 support roller
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Laser Beam Processing (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (15)
- (a) 유지부와 무지부로 구획된 집전체를 포함하며, 상기 무지부에 절연층이 적층된 전극시트를 준비하는 단계; 및(b) 상기 절연층이 적층된 무지부를 노칭하여 전극탭을 형성하는 단계;를 포함하며,상기 노칭은 펄스폭이 100 ps 내지 10-6 ps인 레이저를 사용하여 수행하는 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 제1항에 있어서,상기 레이저는 평균출력 에너지가 평균주행속도 100 mm/s 내지 2,000 mm/s 기준 10W 내지 200W인 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 제1항에 있어서,상기 노칭 시 주행 평균주행속도는 100 mm/s 내지 2,000 mm/s인 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 제1항에 있어서,상기 절연층은 고분자 수지를 포함하는 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 제4항에 있어서,상기 고분자 수지는 스티렌-부타딘엔 고무, 아크릴레이트 스티렌-부타디엔 고무, 아크릴로니트릴-부타디엔 고무, 아크릴로니트릴-부타디엔-스티렌 고무, 아크릴 고무, 부틸 고무, 불소 고무, 폴리비닐리덴플루오라이드, 폴리테트라플루오로에틸렌, 폴리에틸렌, 폴리프로필렌, 에틸렌프로필렌 공중합체, 폴리에틸렌옥시드, 폴리비닐피롤리돈, 폴리에피크로로히드린, 폴리포스파젠, 폴리아크릴로니트릴, 폴리스틸렌, 에틸렌프로필렌디엔 공중합체, 폴리비닐피리딘, 클로로설폰화 폴리에틴렌, 라텍스, 폴리에스테르 수지, 아크릴 수지, 페놀 수지, 에폭시 수지, 폴리비닐알코올, 하이드록시프로필메틸셀룰로즈, 하이드록시프로필셀룰로오스, 및 디아세틸셀룰로오스로 이루어진 군으로부터 선택되는 1종 이상인 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 제1항에 있어서,상기 전극시트는 유지부에 활물질이 적층된 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 제1항에 있어서,상기 전극은 양극 또는 음극인 것을 특징으로 하는 이차 전지용 전극의 제조방법.
- 절연층과 집전체가 적층된 상태로 커팅된 레이저 커팅 전극탭을 포함하며,상기 전극탭의 커팅 단면 두께가 커팅전 두께를 기준으로 1배 내지 1.7배인 이차 전지용 전극.
- 제8항에 있어서,상기 레이저는 펄스폭이 100 ps 내지 10-6 ps인 레이저인 것을 특징으로 하는 이차 전지용 전극.
- 제8항에 있어서,상기 전극탭의 커팅 단면은 금형 커팅시 발생하는 실오라기 형태의 드로스(dross)를 포함하지 않는 것을 특징으로 하는 이차 전지용 전극.
- 절연층과 집전체가 적층된 상태로 커팅된 레이저 커팅 전극탭을 포함하며,상기 전극탭의 커팅 단면에서 절연층의 선단부를 기준으로 돌출된 집전체의 길이가 20㎛ 미만인 이차 전지용 전극.
- 제11항에 있어서,상기 레이저는 펄스폭이 100 ps 내지 10-6 ps인 레이저인 것을 특징으로 하는 이차 전지용 전극.
- 제11항에 있어서,상기 전극탭의 커팅 단면은 금형 커팅시 발생하는 실오라기 형태의 드로스(dross)를 포함하지 않는 것을 특징으로 하는 이차 전지용 전극.
- 유지부와 무지부로 구획된 집전체를 포함하며, 상기 무지부에 절연층이 적층된 전극시트를 공급하는 전극시트 공급 장치;상기 절연층이 적층된 무지부를 노칭하여 전극탭을 형성하는 펄스폭이 100 ps 내지 10-6 ps인 레이저 빔 조사 장치; 및상기 전극시트에 대한 레이저 빔 조사부를 하부면에서 지지하는 지그;를 포함하는 전극 제조 시스템.
- 제14항에 있어서,상기 전극시트 공급 장치는 롤투롤(Roll-to-Roll) 장치인 것을 특징으로 하는 전극 제조 시스템.
Priority Applications (3)
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CN202280039795.XA CN117413430A (zh) | 2021-10-25 | 2022-10-24 | 制造二次电池的电极的方法、二次电池的电极、以及用于该方法的电极制造系统 |
EP22887515.9A EP4336645A1 (en) | 2021-10-25 | 2022-10-24 | Method for manufacturing electrode for secondary battery, electrode for secondary battery, and electrode manufacturing system used for method |
JP2023575338A JP2024523063A (ja) | 2021-10-25 | 2022-10-24 | 二次電池用電極の製造方法、二次電池用電極、及び前記方法に用いられる電極製造システム |
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KR1020220136351A KR20230059153A (ko) | 2021-10-25 | 2022-10-21 | 이차 전지용 전극의 제조방법, 이차 전지용 전극, 및 상기 방법에 사용되는 전극 제조 시스템 |
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- 2022-10-24 WO PCT/KR2022/016216 patent/WO2023075319A1/ko active Application Filing
- 2022-10-24 EP EP22887515.9A patent/EP4336645A1/en active Pending
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