Laser drying device

Abstract

This disclosure aims to provide a laser drying apparatus in which the leakage of laser light to the outside is suppressed. [Solution] A laser drying apparatus 100 for drying an electrode composite layer, wherein the laser drying apparatus 100 comprises a laser light source 110, a furnace body 120, a transport path 130, and a laser light absorption tunnel 140, wherein at least a portion of the inner surface of the laser light absorption tunnel 140 has a light-absorbing member, and the light-absorbing member has an absorption rate of 80% or more of laser light 200 from the laser light source 110.

Description

[Technical Field]

[0001] This disclosure relates to a laser drying apparatus. [Background technology]

[0002] Laser drying is a known method for drying electrode composite layers coated on current collector layers. Compared to hot air drying, laser drying consumes less energy and has a lower environmental impact. Various proposals have been made to improve the drying efficiency of laser drying.

[0003] Patent Document 1 discloses an electrode manufacturing method comprising: a transport step of transporting an electrode body coated with at least one electrode material by a transport unit; and a drying step of drying the electrode material while transporting the electrode body by the transport unit, wherein the drying step includes an irradiation step of drying the electrode material by irradiating it with a laser when the electrode body is transported to at least one first position in the transport direction of the transport unit; and a recovery step of recovering the vapor generated as a result of the laser irradiation of the electrode material by a vapor recovery unit provided at at least one second position adjacent to the first position in the transport direction. Patent Document 1 states that, according to the disclosure in Patent Document 1, it is possible to suppress a decrease in drying efficiency when drying the electrode material with a laser. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-169591 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The production of the electrode laminate can be made more efficient by conveying it in a roll-to-roll manner. In this case, when drying the electrode mixture layer inside the furnace body, an inlet for carrying the electrode mixture layer into the furnace body and an outlet for carrying the dried electrode mixture layer out of the furnace body are required.

[0006] However, if there are openings such as the above-mentioned inlet and outlet in the furnace body, when the drying method is laser drying, laser light may leak from the openings.

[0007] Therefore, an object of the present disclosure is to provide a laser drying device in which leakage of laser light to the outside is suppressed.

Means for Solving the Problem

[0008] The present disclosure achieves the above object by the following means. 〈Aspect 1〉 A laser drying device for drying an electrode mixture layer, The laser drying device includes a laser light source, a furnace body, a conveyance path, and a laser light absorption tunnel, The laser light source is configured to irradiate and heat the electrode mixture layer inside the furnace body with laser light, and (i) The laser light absorption tunnel is disposed at the inlet of the furnace body, whereby the electrode mixture layer is carried into the furnace body through the laser light absorption tunnel and the inlet by the conveyance path, and carried out through the outlet, and / or (ii) The laser light absorption tunnel is disposed at the outlet of the furnace body, whereby the electrode mixture layer is carried into the furnace body through the inlet by the conveyance path, and carried out through the outlet and the laser light absorption tunnel, and At least a part of the inner surface of the laser light absorption tunnel has an absorptive member, and The absorptive member has an absorption rate of laser light from the laser light source of 80% or more. Laser drying device. <Aspect 2> The laser drying apparatus according to Aspect 1, wherein the area of the light absorbing member is 90% or more of the area of the inner surface of the laser light absorption tunnel. <Aspect 3> The laser drying apparatus according to Aspect 1 or 2, wherein the laser light absorption tunnel has a light shielding plate that suppresses leakage of laser light from the laser light absorption tunnel. <Aspect 4> A method for manufacturing an electrode laminate using the apparatus according to any one of Aspects 1 to 3, comprising: irradiating a laser beam onto an electrode mixture layer coated on a current collector layer; A method for laminating an electrode laminate, including this step.

Advantages of the Invention

[0009] According to the present disclosure, it is possible to provide a laser drying apparatus in which leakage of laser light to the outside is suppressed.

Brief Description of the Drawings

[0010] [Figure 1] FIG. 1 is a schematic diagram for explaining the laser drying apparatus of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram for explaining the laser drying apparatus of the present disclosure. [Figure 3] FIG. 3 is a schematic diagram for explaining Examples and Comparative Examples.

Modes for Carrying Out the Invention

[0011] 《Laser Drying Apparatus》 A laser drying apparatus for drying an electrode mixture layer, the laser drying apparatus having a laser light source, a furnace body, a conveyance path, and a laser light absorption tunnel, the laser light source being configured to irradiate and heat the electrode mixture layer in the furnace body with laser light, and (i) The laser light absorbing tunnel is located at the entrance of the furnace body, so that the electrode composite layer is transported into the furnace body through the laser light absorbing tunnel and the entrance via the transport path, and / or is transported out through the exit (ii) The laser light absorbing tunnel is located at the outlet of the furnace body, so that the electrode composite layer is transported into the furnace body through the inlet via the transport path, and then transported out through the outlet and the laser light absorbing tunnel. Occasionally, At least a portion of the inner surface of the above-mentioned laser light absorbing tunnel has a light-absorbing member, and The above light-absorbing member has an absorption rate of 80% or more of the laser light from the above laser light source. Laser drying device.

[0012] According to this disclosure, it is possible to provide a laser drying apparatus in which the leakage of laser light to the outside is suppressed.

[0013] The Disclosers have found that by arranging a laser light absorption tunnel when laser drying an electrode composite layer, leakage of laser light from the furnace opening can be suppressed. Laser light leaking from the furnace opening enters the laser light absorption tunnel connected to the furnace opening. Since the inner surface of the laser light absorption tunnel has an absorbent material with a high laser light absorption rate, the laser light is absorbed by the absorbent material and does not leak to the outside.

[0014] Specifically, as shown in Figure 1, the laser drying apparatus 100 includes a laser light source 110, a furnace body 120, a transport path 130, and a laser light absorption tunnel 140. The transport path 130 has a transport belt 131 and transport rollers 132, and the transport rollers 132 rotate to move the electrode mixture layer placed on the transport belt 131 at a constant speed in the transport direction. Therefore, it is possible to transport the electrode mixture layer from outside the furnace body 120 into the furnace body 120 and to transport the electrode mixture layer from inside the furnace body 120 to outside the furnace body 120. The electrode mixture layer transported into the furnace body 120 by the transport path 130 is irradiated with laser light 200 from the laser light source 110.

[0015] A laser light absorption tunnel 140 is located at the entrance of the furnace body 120. Even if laser light 200 leaks out of the furnace body 120 through the entrance, the leaked laser light 200 is absorbed within the laser light absorption tunnel 140 and does not leak to the outside. In addition, the laser light absorption tunnel 140 has a light shielding plate 141 to enhance the absorption efficiency of the laser light 200.

[0016] Furthermore, the laser drying apparatus 100 includes a hot air supply device 150 and an exhaust device 160. The hot air supply device 150 consists of a hot air generator 151, an air supply duct 152, and an air supply nozzle 153. The hot air supply device 150 supplies hot air generated by the hot air generator 151 into the furnace body 120 via the air supply duct 152 and the air supply nozzle 153. The hot air is supplied in the direction of transport and in the direction opposite to the transport direction. Steam near the surface of the electrode mixture layer generated by irradiation with laser light 200 is removed by the hot air and then discharged to the outside of the furnace body 120 by the exhaust device 160. This makes it possible to increase the drying efficiency of the electrode mixture layer.

[0017] The embodiments of this disclosure will be described in detail below. However, this disclosure is not limited to the embodiments described below and can be implemented in various ways within the scope of the gist of this disclosure.

[0018] The laser drying device of the present disclosure is a laser drying device for drying an electrode mixture layer.

[0019] Regarding the present disclosure, "electrode mixture" means a composition that can form an electrode active material layer as it is or by further containing other components. And "electrode mixture layer" means a layer that contains a dispersion medium in addition to the "electrode mixture" and can be applied and dried to form an electrode active material layer.

[0020] The laser drying device of the present disclosure has a laser light source, a furnace body, a conveyance path, and a laser light absorption tunnel. Further, the laser drying device may further include a heat supply device and an exhaust device.

[0021] The energy density of the laser light irradiated from the laser light source to the electrode mixture layer in the furnace body is not particularly limited. For example, for example, 0.1 W / cm 2 or more, 0.5 W / cm 2 or more, 1.0 W / cm 2 or more, 2.0 W / cm 2 or more, or 3.0 W / cm 2 or more may be used, and 20.0 W / cm 2 or less, 10.0 W / cm 2 or less, 7.0 W / cm 2 or less, or 4.0 W / cm 2 or less may also be used.

[0022] The distance between the laser light source and the electrode mixture layer irradiated with the laser light is not particularly limited and may be appropriately determined in consideration of the irradiation region of the laser light. The above distance may be, for example, 300 mm or more, 500 mm or more, 1000 mm or more, 1500 mm or more, 2000 mm or more, and may also be 5000 mm or less, 4000 mm or less, or 3000 mm or less.

[0023] 〈Laser Light Source〉 The laser light source is configured to irradiate and heat the electrode mixture layer in the furnace body with laser light. The laser light source may be disposed inside the furnace body or outside the furnace body.

[0024] The type of laser light source is not particularly limited and may be, for example, a Yb fiber laser, a YAG laser, a carbon dioxide laser, etc. The wavelength of the laser light may be 0.5 μm or more, 0.6 μm or more, 0.7 μm or more, 0.8 μm or more, or 0.9 μm or more, and may be 1.5 μm or less, 1.4 μm or less, 1.3 μm or less, 1.2 μm or less, or 1.1 μm or less. The laser light may be a single wavelength or multiple wavelengths.

[0025] The output power of the laser light source is not particularly limited and may be appropriately determined based on the laser light irradiation area, the available irradiation time, etc. The output power of the laser light source may be, for example, 0.1 kW or more, 1 kW or more, 5 kW or more, 10 kW or more, 15 kW or more, 20 kW or more, or 30 kW or more, and may be 100 kW or less, 70 kW or less, or 50 kW or less.

[0026] The number of laser light sources is not particularly limited and may be determined as appropriate based on the laser light irradiation area, the available irradiation time, etc. The number of laser light sources may be, for example, one or more, two or more, three or more, five or more, or ten or more, or it may be 30 or less, or 20 or less.

[0027] The shape of the irradiation area of ​​the electrode composite layer with the laser light may be, for example, rectangular. Furthermore, the size of the irradiation area is not particularly limited and may be appropriately determined by the dimensions of the electrode composite layer.

[0028] <Furnace body> Inside the furnace, the electrode mixture layer is dried by irradiation with laser light. The furnace body has an inlet for transporting the electrode mixture layer via a transport path, and an outlet for transporting it out.

[0029] The dimensions of the above-mentioned opening are not particularly limited, but are preferably narrow from the viewpoint of reducing the leakage of laser light to the outside of the furnace body. The dimensions of the opening may be, for example, the minimum gap necessary for the transport path and electrode composite layer to pass through.

[0030] The material of the furnace body is not particularly limited and may be, for example, steel, stainless steel, aluminum, etc. The exterior substrate may be surface-treated with zinc plating, powder coating, etc. The dimensions of the furnace body are not particularly limited and may be determined as appropriate considering the dimensions of the electrode composite layer, etc.

[0031] <Laser light absorption tunnel> The laser light absorption tunnel is located at the entrance and / or exit of the furnace body. When located at the entrance, the electrode mixture layer is transported into the furnace body via the laser light absorption tunnel and the entrance, and then transported out through the exit. When located at the exit, the electrode mixture layer is transported into the furnace body via the entrance, and then transported out through the exit and the laser light absorption tunnel. The laser light absorption tunnel absorbs laser light leaking from the furnace body.

[0032] At least a portion of the inner surface of the laser light absorption tunnel has an absorbing element. The larger the area of ​​the absorbing element on the inner surface, the more laser light leaking from the furnace body can be absorbed within the laser light absorption tunnel.

[0033] The light-absorbing member has an absorption rate of 80% or more of laser light from the laser light source. Due to the high absorption rate of laser light, laser light leaking from the furnace body can be absorbed within the laser light absorption tunnel. The above absorption rate may be 85% or more, 90% or more, 95% or more, 100% or less, 99% or less, or 98% or less.

[0034] The transmittance of laser light can be measured by spectrophotometric method using an ultraviolet-visible-near-infrared spectrophotometer (Shimadzu Corporation, SolidSpec-3700DUV).

[0035] The light-absorbing material is not particularly limited and may be, for example, carbon black.

[0036] The dimensions of the laser light absorption tunnel are not particularly limited; for example, the length in the width direction may be appropriately determined by the dimensions of the transport path, furnace body, etc. A longer length in the transport direction and height direction can increase the laser light absorption capacity of the laser light absorption tunnel.

[0037] A laser light absorption tunnel may have a light-shielding plate to suppress the leakage of laser light from the tunnel. By having a light-shielding plate, the area that can absorb laser light increases, and therefore the laser light absorption capacity of the laser light absorption tunnel is enhanced.

[0038] The number of light-shielding plates is not particularly limited. The more light-shielding plates there are, the higher the laser light absorption capacity of the laser light absorption tunnel.

[0039] The dimensions of the light-shielding plate are not particularly limited, but it is preferable that they be dimensions that minimize the gap through which the laser light can pass. The gap may be, for example, the minimum gap necessary for the transport path and the electrode composite layer to pass through.

[0040] The position of the light-shielding plate is not particularly limited, but it is preferable to position it on a plane perpendicular to the conveying direction. It may be positioned above or below the conveying path in the height direction.

[0041] The material of the light shield is not particularly limited. Preferably, the surface material of the light shield has a high absorption rate of laser light from the laser light source. The surface material of the light shield may be the same as, for example, the light-absorbing member.

[0042] <Conveying equipment> The conveying equipment is not particularly limited and may be, for example, a roller conveyor, a belt conveyor, etc. The electrode mixture layer may be placed, for example, on a conveying path and transported into the furnace body and transported out of the furnace body.

[0043] The electrode mixture layer may be irradiated with laser light while moving inside the furnace body using a conveying device. In this case, the moving speed may be appropriately determined considering the output of the laser light source, the amount of energy required to dry the electrode mixture layer, etc. The moving speed may be, for example, 0.1 m / s or more, 0.3 m / s or more, 0.5 m / s or more, or 1.0 m / s or more, or 3.0 m / s or less, 2.5 m / s or less, or 2.0 m / s or less.

[0044] The conveying equipment may be connected to other devices such as an electrode composite layer coating device or an electrode laminate winding device.

[0045] <Hot air supply equipment> The hot air supply equipment supplies hot air into the furnace body. By supplying hot air to the electrode mixture layer, steam on the surface of the electrode mixture layer can be removed, thereby improving drying efficiency.

[0046] The temperature of the hot air supplied from the hot air supply equipment may be 100°C or higher, 150°C or higher, 160°C or higher, 180°C or higher, 200°C or higher, 220°C or higher, 240°C or higher, 260°C or higher, 280°C or higher, or 300°C or higher, and may be 500°C or lower, 450°C or lower, 400°C or lower, or 350°C or lower.

[0047] The hot air supply equipment is not particularly limited and may, for example, supply air heated by gas combustion, oil combustion, electric heating, etc., to the electrode mixture layer via a blower fan through a blower duct and blower nozzle. From the viewpoint of drying the electrode mixture layer, the hot air is preferably low in humidity.

[0048] The direction of hot air supply is not particularly limited; for example, if the electrode mixture layer is transported inside the furnace body, the direction may be opposite to the transport direction. Furthermore, multiple air nozzles may be arranged, each with a different supply direction.

[0049] The wind speed of the hot air is not particularly limited and may be, for example, 5 m / s or more, 10 m / s or more, 15 m / s or more, or 20 m / s or more. Higher wind speeds result in higher drying efficiency of the electrode mixture layer. Alternatively, the wind speed of the hot air may be 60 m / s or less, 50 m / s or less, 40 m / s or less, or 30 m / s or less.

[0050] <Exhaust equipment> The laser drying apparatus may have an exhaust system. Having an exhaust system allows for the recovery of vapors generated from the electrode mixture layer, thereby increasing drying efficiency. The vapors may be water vapor or other gases.

[0051] The exhaust equipment may be configured, for example, by using an exhaust fan to draw steam in from the exhaust port and discharge it to the outside of the furnace body via an exhaust duct. The output of the exhaust fan, the dimensions of the exhaust port and exhaust duct may be determined appropriately considering the amount of steam generated, etc.

[0052] From the viewpoint of improving drying efficiency, it is preferable that the exhaust port be located above the electrode mixture layer and in a position that does not interfere with laser irradiation. The distance between the exhaust port and the electrode mixture layer may be a distance sufficient to allow steam to be drawn in. The number of exhaust ports is not particularly limited.

[0053] Method for manufacturing electrode stacks A method for manufacturing an electrode laminate using a laser drying apparatus, as disclosed herein, Irradiating the electrode composite layer coated on the current collector layer with laser light, A method for laminating electrode stacks, including the method described above.

[0054] According to this disclosure, it is possible to provide a method for manufacturing an electrode stack in which the leakage of laser light to the outside is suppressed.

[0055] The method disclosed herein is a method for manufacturing an electrode laminate using the laser drying apparatus described herein. For details regarding the laser drying apparatus, please refer to the description of the laser drying apparatus above.

[0056] The method of this disclosure includes irradiating an electrode mixture layer coated on a current collector layer with laser light. The electrode mixture layer and the laser light can be described in the above-described laser drying apparatus. By irradiating the electrode mixture layer with laser light, the dispersion medium contained in the electrode mixture layer volatilizes, forming an electrode active material layer.

[0057] The dispersion medium contained in the electrode composite layer is not particularly limited and may include, for example, nonpolar solvents such as heptane, xylene, and toluene, as well as polar solvents such as water, tertiary amine solvents, ether solvents, thiol solvents, ketone solvents (e.g., diisobutyl ketone) and ester solvents (e.g., butyl butyrate).

[0058] The content of the above-mentioned dispersion medium is not particularly limited, and may be such that the solid content of the electrode composite layer is 30% or more, 35% or more, 40% or more, 45% or more, or 50% or more, or it may be such that it is 80% or less, 75% or less, 70% or less, 65% or less, or 60% or less.

[0059] The coating method for the electrode composite layer is not particularly limited and may include the doctor blade method, die coating method, gravure coating method, spray coating method, electrostatic coating method, bar coating method, etc.

[0060] The irradiation time of the laser light is not particularly limited, and may be extended, for example, until the reduction drying period of the electrode composite layer is reached. The irradiation time of the laser light may be, for example, 30 seconds or more, 1 minute or more, or 2 minutes or more, and may be 30 minutes or less, 20 minutes or less, or 10 minutes or less.

[0061] <Electrode Laminate> The electrode stack may have an electrode active material layer and a current collector layer. The electrode active material layer may be a positive electrode active material layer or a negative electrode active material layer. Furthermore, the electrode stack may be a bipolar electrode stack having a positive electrode active material layer and a negative electrode active material layer.

[0062] (electrode active material layer) If the electrode active material layer of this disclosure is a positive electrode active material layer, this positive electrode active material layer contains at least a positive electrode active material. If the electrode active material layer is a negative electrode active material layer, this negative electrode active material layer contains at least a negative electrode active material. The electrode active material layer may further optionally contain a binder, a solid electrolyte, and a conductive additive. The electrode active material layer may also contain various other additives. The respective contents of the positive electrode active material, negative electrode active material, binder, solid electrolyte, conductive additive, etc. in the electrode active material layer should be appropriately determined according to the desired battery performance.

[0063] The material of the positive electrode active material is not particularly limited as long as it is capable of intercalating and releasing lithium ions. Examples of positive electrode active materials include lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium manganese oxide (LiMn2O4), and nickel-cobalt-manganese oxide (NCM:LiCO2). 1 / 3 Ni 1 / 3 Mn 1 / 3 O2), lithium nickel-cobalt aluminum oxide (LiNi 0.8 (CoAl) 0.2 O2), Li 1+x Mn 2-x-y M y This may include, but is not limited to, heteroatom-substituted Li-Mn spinel with a composition represented by O4 (where M is one or more metallic elements selected from Al, Mg, Co, Fe, Ni, and Zn).

[0064] The shape of the positive electrode active material is not particularly limited, as long as it is a shape common for positive electrode active materials in batteries. The positive electrode active material may be, for example, particulate. The positive electrode active material may be primary particles or secondary particles formed by the aggregation of multiple primary particles. The average particle diameter D of the positive electrode active material 50 For example, it may be 1 nm or more, 5 nm or more, or 10 nm or more, and it may also be 500 μm or less, 100 μm or less, 50 μm or less, or 30 μm or less. Note that the average particle diameter D 50 This is the particle diameter (median diameter) at 50% of the integrated value in the volume-based particle size distribution determined by laser diffraction and scattering.

[0065] As the negative electrode active material, various materials can be used whose potential for intercalating and releasing lithium ions (charge / discharge potential) is lower than that of the positive electrode active material described above. The material of the negative electrode active material is not particularly limited and may be metallic lithium, or any material capable of intercalating and releasing metallic ions such as lithium ions. Examples of materials capable of intercalating and releasing metallic ions such as lithium ions include alloy-based negative electrode active materials, carbon materials, or lithium titanate (Li4Ti5O4). 12 Examples include, but are not limited to, those listed above.

[0066] The alloy-based anode active material is not particularly limited and includes, for example, Si alloy-based anode active materials or Sn alloy-based anode active materials. Si alloy-based anode active materials include silicon, silicon oxide, silicon carbide, silicon nitride, or solid solutions thereof. Si alloy-based anode active materials may also contain metallic elements other than silicon, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, Ti, etc. Sn alloy-based anode active materials include tin, tin oxide, tin nitride, or solid solutions thereof. Sn alloy-based anode active materials may also contain metallic elements other than tin, such as Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, Si, etc.

[0067] The carbon material is not particularly limited and examples include hard carbon, soft carbon, and graphite.

[0068] The shape of the negative electrode active material is not particularly limited, but any shape common for negative electrode active materials in batteries is acceptable. The negative electrode active material may be in the form of parts or sheets, for example.

[0069] The material of the binder is not particularly limited. The binder may be, for example, polyvinylidene fluoride (PVdF), butadiene rubber (BR), polytetrafluoroethylene (PTFE), styrene-butadiene rubber (SBR), etc., but is not limited to these. The binder is not particularly limited, and may be used alone or in combination of two or more types.

[0070] The material of the solid electrolyte is not particularly limited and may be, for example, a sulfide solid electrolyte, an oxide solid electrolyte, or a polymer electrolyte.

[0071] Examples of sulfide solid electrolytes include, but are not limited to, sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, or argyrodite-type solid electrolytes. Specific examples of sulfide solid electrolytes include the Li2S-P2S5 system (Li7P3S 11 , Li3PS4, Li8P2S9, etc.), Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-LiBr-Li2S-P2S5, Li2S-P2S5-GeS2 (Li 13 GeP3S 16 Li 10 GeP2S 12 ), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x PS 6-x Cl x Etc.; or combinations thereof, but not limited to these.

[0072] An example of an oxide solid electrolyte is Li7La3Zr2O 12 Li 7-x La3Zr 1-x Nb x O 12 Li 7-3x La3Zr2Al x O 12 Li 3x La 2 / 3-x TiO3, Li 1+x Al x Ti 2-x (PO4)3, Li 1+x Alx Ge 2-x (PO4)3, Li3PO4, or Li 3+x PO 4-x N x Examples include (LiPON), etc.; or combinations thereof, but are not limited to these.

[0073] The sulfide solid electrolyte and oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0074] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0075] The conductive additive is not particularly limited. Examples of conductive additives include, but are not limited to, vapor-grown carbon fibers (VGCF), acetylene black (AB), Ketjenblack (KB), carbon nanotubes (CNT), and carbon nanofibers (CNF). The conductive additive may be particulate or fibrous, and its size is not particularly limited. While the conductive additive is not particularly limited, it may be used alone or in combination of two or more types.

[0076] (Current collector layer) The material of the current collector layer is not particularly limited, but a material commonly used as a conductor for battery electrodes can be appropriately adopted. Examples of materials for the conductive layer include, but are not limited to, Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, etc. Furthermore, the current collector layer may be a metal foil or a substrate on which the above metals are plated or deposited.

[0077] The shape of the current collector layer is not particularly limited, but examples include foil-like, plate-like, or mesh-like shapes. Among these, a foil-like shape is preferred.

[0078] The thickness of the current collector layer is not particularly limited, but may be 0.1 μm or more, or 1 μm or more, or 1 mm or less, or 100 μm or less. [Examples]

[0079] The present invention will be specifically described by examples and comparative examples, but the present invention is not limited thereto.

[0080] Laser drying equipment As shown in Figure 3, a laser light source 110 and a furnace body 120 were arranged, and a laser light absorption tunnel 140 was connected to the opening of the furnace body 120. The laser drying apparatus of Example 1 had a black paint coating as a light-absorbing material applied to the entire inner surface of the laser light absorption tunnel 140, while the laser drying apparatus of Comparative Example 1 had an aluminum inner surface for the entire inner surface of the laser light absorption tunnel 140.

[0081] Evaluation of light leakage In the laser drying apparatus of Example 1 and Comparative Example 1, laser light 200 was irradiated onto the furnace body from the laser light source 110. The irradiated energy density was as shown in Table 1. The amount of light measured at the light intensity measurement position 300 while the laser light 200 was irradiated was evaluated as the amount of leaked light. The results are shown in Table 1.

[0082] [Table 1]

[0083] From Example 1 and Comparative Example 1 in Table 1, it can be seen that if the inner surface of the laser light absorption tunnel has an absorbent material with a high laser light absorption rate, the amount of leaked light can be significantly reduced. Therefore, a laser drying apparatus with suppressed laser light leakage can be provided. [Explanation of Symbols]

[0084] 100 Laser drying apparatus 110 Laser light source 120 Furnace body 130 Conveyor paths 131 Conveyor belt 132 Conveyor rollers 140 Laser light absorption tunnel 141 Light-blocking plate 150 Hot air supply equipment 151 Hot air generator 152 Air intake duct 153 Air intake nozzle 160 Exhaust equipment 200 laser beams 300 Light intensity measurement position

Claims

1. A laser drying apparatus for drying an electrode composite layer, The laser drying apparatus comprises a laser light source, a furnace body, a transport path, and a laser light absorption tunnel. The laser light source is configured to heat the electrode composite layer inside the furnace body by irradiating it with a laser, and (i) The laser light absorbing tunnel is located at the entrance of the furnace body, so that the electrode composite layer is transported into the furnace body through the laser light absorbing tunnel and the entrance via the transport path, and / or is transported out through the exit (ii) The laser light absorbing tunnel is located at the outlet of the furnace body, so that the electrode composite layer is transported into the furnace body through the inlet via the transport path and transported out through the outlet and the laser light absorbing tunnel. Occasionally, At least a portion of the inner surface of the laser light absorbing tunnel has a light-absorbing member, and The light-absorbing member has an absorption rate of 80% or more of the laser light from the laser light source. Laser drying device.

2. The laser drying apparatus according to claim 1, wherein the area of ​​the light-absorbing member is 90% or more of the area of ​​the inner surface of the laser light-absorbing tunnel.

3. The laser drying apparatus according to claim 1 or 2, wherein the laser light absorbing tunnel has a light-shielding plate that suppresses the leakage of laser light from the laser light absorbing tunnel.

4. A method for manufacturing an electrode laminate using the apparatus described in claim 1 or 2, Irradiating the electrode composite layer coated on the current collector layer with laser light, A method for laminating electrode stacks, including the method described above.

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