Laser drying device

Abstract

The present disclosure aims to provide a laser drying apparatus that can uniformly dry electrode composite layers and has high drying efficiency. [Solution] A laser drying apparatus 100 for drying an electrode composite layer 300, wherein the laser drying apparatus 100 comprises a furnace body 110, a transport path 120, a laser light source 130, and a plurality of hot air supply units 140, wherein at least one of the plurality of hot air supply units 140 is arranged within the furnace body 110 to supply hot air from one side of the transport path 120 toward the surface of the electrode composite layer 300, and at least one of the plurality of hot air supply units 140 is arranged within the furnace body 110 to supply hot air from the other side of the transport path 120 toward the back surface of the electrode composite layer 300.

Description

[Technical Field]

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

[0002] Hot air drying is a known method for drying the electrode composite layer coated on the current collector layer.

[0003] Patent Document 1 discloses a drying apparatus equipped with a conveying path having a plurality of conveying rollers inside, comprising: a plurality of hot air supply units arranged opposite to and along the conveying path to supply hot air to the conveying path; and a rectifier plate arranged between adjacent hot air supply units to guide the hot air along the conveying direction, wherein the rectifier plate has a hot air exhaust unit for exhausting the hot air, and when the direction perpendicular to the conveying direction of the conveying path is defined as the width direction, the shape of the hot air exhaust unit such that the length in the conveying direction at the center in the width direction is longer than the length in the conveying direction at the ends in the width direction. Patent Document 1 states that according to the disclosure in Patent Document 1, it is possible to provide a drying apparatus that can suppress uneven drying of conveyed materials.

[0004] On the other hand, laser drying is another known drying method. Compared to hot air drying, laser drying consumes less energy and has a lower environmental impact. Various proposals have been made to improve the quality and drying efficiency of laser drying.

[0005] In Patent Document 2, there is provided a method for manufacturing an electrode body, including a conveying step of conveying an electrode body coated with at least one electrode material by a conveying unit, and a drying step of drying the electrode material while the electrode body is being conveyed by the conveying unit. The drying step includes an irradiation step of drying the electrode material by irradiating the electrode material with a laser when the electrode body is conveyed to at least one first position in the conveying direction of the conveying unit, and a recovery step of recovering vapor generated due to the irradiation of the laser on the electrode material by a vapor recovery unit provided at at least one second position adjacent to the first position in the conveying direction. According to the disclosure of Patent Document 2, it is stated that when drying the electrode material by laser, it is possible to suppress a decrease in drying efficiency.

[0006] Also, it is known that when performing laser drying, the drying efficiency can be enhanced by simultaneously supplying hot air.

[0007] In Patent Document 3, there is provided a method for manufacturing an electrode sheet, including a coating step of applying an active material paste onto the surface of a long metal sheet while conveying the long metal sheet, and a drying step of drying the active material paste on the metal sheet while conveying the metal sheet coated with the active material paste in a furnace body, which is carried out in parallel with the coating step. In the furnace body, hot air is blown along the conveying direction of the metal sheet, and light is irradiated from at least one light source onto the active material paste on the metal sheet. Due to the irradiation of the light, the temperature of the active material paste becomes higher than the temperature in the furnace body. According to the disclosure of Patent Document 3, it is stated that by appropriately controlling the temperature of the active material paste, the drying of the active material paste can be uniformly performed in a short time.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0009] When laser-drying the electrode composite material layer, the drying efficiency can be increased by supplying hot air to the electrode composite material layer. In this case, in order not to block the laser irradiation to the electrode composite material layer, it is conceivable to arrange the hot air supply part on the side part of the conveyance path and supply hot air from the side part of the conveyance path to the electrode composite material layer. Furthermore, in order to dry the electrode composite material layer uniformly, it is conceivable to supply hot air from both side parts of the conveyance path. However, when hot air is supplied from both side parts of the conveyance path, the hot air supplied from both side parts collides at the central part of the electrode composite material layer, and the wind speed of the hot air at the central part decreases. As a result, the drying of the electrode composite material layer becomes non-uniform.

[0010] Also, when laser-drying the electrode composite material layer, it is difficult to irradiate only the electrode composite material layer with laser light, and the current collector layer is also irradiated with laser light. Therefore, the current collector layer becomes high temperature, and as a result of the heat being transferred to the end part of the electrode composite material layer, the drying of only the end part of the electrode composite material layer is promoted, and the drying of the electrode composite material layer may become non-uniform.

[0011] Therefore, an object of the present disclosure is to provide a laser drying device that can dry the electrode composite material layer uniformly and has high drying efficiency.

Means for Solving the Problems

[0012] The present disclosure achieves the above object by the following means. <Aspect 1> A laser drying device for drying an electrode composite material layer, The laser drying device includes a furnace body, a conveyance path, a laser light source, and a plurality of hot air supply parts, The electrode composite material layer is conveyed in the conveyance direction on the conveyance path in the furnace body, The above-mentioned laser light source is configured to heat the electrode composite layer being transported within the furnace body by irradiating it with laser light. At least one of the above-mentioned multiple hot air supply units is arranged within the furnace body to supply hot air from one side of the transport path toward the surface of the electrode composite layer. At least one of the above-mentioned multiple hot air supply units is arranged within the furnace body to supply hot air from the other side of the transport path toward the back surface of the electrode composite layer. Laser drying device. <Aspect 2> The apparatus according to embodiment 1, wherein the amount of hot air supplied from a hot air supply unit arranged to supply hot air toward the surface of the electrode mixture layer is greater than the amount of hot air supplied from a hot air supply unit arranged to supply hot air toward the back surface of the electrode mixture layer. <Aspect 3> A method for manufacturing an electrode laminate using the apparatus described in Embodiment 1 or 2, Irradiating the electrode composite layer coated on the current collector layer with laser light, and To supply hot air into the furnace body, A method for manufacturing an electrode stack, including [the specified element]. [Effects of the Invention]

[0013] According to this disclosure, it is possible to provide a laser drying apparatus that can uniformly dry electrode composite layers and has high drying efficiency. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a schematic diagram illustrating the laser drying apparatus of this disclosure. [Figure 2] Figure 2 is a schematic diagram illustrating the laser drying apparatus of this disclosure. [Modes for carrying out the invention]

[0015] 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.

[0016] Laser drying equipment A laser drying apparatus for drying an electrode composite layer, The above laser drying apparatus comprises a furnace body, a transport path, a laser light source, and multiple hot air supply units. The electrode composite layer described above is transported along the transport path within the furnace body in the transport direction. The above-mentioned laser light source is configured to heat the electrode composite layer being transported within the furnace body by irradiating it with laser light. At least one of the above-mentioned multiple hot air supply units is arranged within the furnace body to supply hot air from one side of the transport path toward the surface of the electrode composite layer. At least one of the above-mentioned multiple hot air supply units is arranged within the furnace body to supply hot air from the other side of the transport path toward the back surface of the electrode composite layer. Laser drying device.

[0017] According to this disclosure, it is possible to provide a laser drying apparatus that can uniformly dry electrode composite layers and has high drying efficiency.

[0018] The Disclosers investigated how to improve the drying efficiency of laser drying by supplying hot air to the electrode mixture layer, and found that it is difficult to dry the electrode mixture layer uniformly. In response, the Disclosers found that the electrode mixture layer can be dried uniformly by arranging at least one hot air supply unit within the furnace body to supply hot air from one side of the transport path toward the surface of the electrode mixture layer, and at least one other hot air supply unit within the furnace body to supply hot air from the other side of the transport path toward the back surface of the electrode mixture layer. Since the opposing hot airs are supplied to the front and back surfaces of the electrode mixture layer, they do not collide in the center of the electrode mixture layer, and hot air with sufficient air velocity is supplied to the center of the electrode mixture layer. Therefore, even when the drying efficiency is improved by supplying hot air to the electrode mixture layer, the electrode mixture layer is dried uniformly.

[0019] Furthermore, by supplying hot air from the side of the transport path, the current collector layer adjacent to the electrode composite layer is cooled by the high-velocity airflow, preventing it from becoming hot and suppressing heat transfer to the edges of the electrode composite layer.

[0020] Specifically, as shown in Figure 1, the laser drying apparatus 100 includes a furnace body 110, a transport path 120, a laser light source 130, and a plurality of hot air supply units 140.

[0021] As the conveyor roller 121 rotates, the electrode mixture layer 300 and the current collector layer 400, which are placed on the conveyor path 120, can be conveyed at a constant speed in the conveying direction. Therefore, it is possible to transport the electrode mixture layer 300 and the current collector layer 400 from outside the furnace body 110 into the furnace body 110, and to transport the electrode mixture layer 300 and the current collector layer 400 from inside the furnace body 110 to outside the furnace body 110.

[0022] The electrode mixture layer 300, transported into the furnace body 110 via the transport path 120, is irradiated with laser light 200 from the laser light source 130 located outside the furnace body 110. This removes volatile components contained in the electrode mixture layer 300 and dries the electrode mixture layer.

[0023] The hot air generated by the hot air generator 141 is supplied to multiple hot air supply units 140 via the air supply duct 142. As shown in Figure 2(a), hot air supply unit 140-1 is positioned inside the furnace body 110 to supply hot air from the front side in the width direction of the transport path 120 toward the surface of the electrode mixture layer 300, and hot air supply unit 140-2 is positioned inside the furnace body 110 to supply hot air from the back side in the width direction of the transport path 120 toward the back surface of the electrode mixture layer. By positioning the hot air supply units 140 in this way and radiating hot air in direction 500, the electrode mixture layer is dried uniformly without the hot air colliding with the center of the electrode mixture layer in the width direction. The volatile components removed from the electrode mixture layer 300 by the laser light 200 and hot air are discharged to the outside of the furnace body by the exhaust equipment 150.

[0024] The laser drying apparatus of this disclosure is a laser drying apparatus for drying an electrode composite layer.

[0025] In this disclosure, "electrode mixture" means a composition that can constitute an electrode active material layer, either as is or by further containing other components. The "electrode mixture layer" means a layer that, in addition to the "electrode mixture," contains a dispersion medium and can be applied and dried to form an electrode active material layer. The electrode mixture layer is applied to at least a portion of the current collector layer and dried.

[0026] The laser drying apparatus of this disclosure comprises a furnace body, a transport path, a laser light source, and a plurality of hot air supply units. The laser drying apparatus may also further include an exhaust device.

[0027] <Furnace body> Drying the electrode mixture layer inside the furnace body can improve drying efficiency.

[0028] The furnace body may have an inlet for transporting the electrode mixture layer via a transport path, and may also have an outlet for transporting the electrode mixture layer.

[0029] The base material of the furnace body is not particularly limited and may be, for example, steel, stainless steel, aluminum, etc. The furnace body may be surface-treated by zinc plating, powder coating, etc. The size of the furnace body is not particularly limited and may be determined as appropriate considering the dimensions of the electrode composite layer, etc.

[0030] From the viewpoint of improving the drying efficiency of the electrode mixture layer, the furnace body preferably has high thermal insulation properties, and may have thermal insulation material on the outside of the base material. Examples of thermal insulation materials include firebrick, ceramic fiber, and glass wool.

[0031] <Transportation route> The electrode mixture layer is transported along a transport path within the furnace body in the transport direction. Here, "transport direction" refers to the direction in which the electrode mixture layer is transported, and means the transport direction in Figure 1. The type of transport path is not particularly limited and may be, for example, a roller conveyor, a belt conveyor, etc.

[0032] The electrode mixture layer may be irradiated with laser light while being transported inside the furnace body via a transport path. In this case, the transport 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 transport 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.

[0033] The transport path may be connected to other devices such as an electrode composite layer coating device or an electrode laminate winding device.

[0034] <Laser light source> The laser light source is designed to heat the electrode composite layer being transported within the furnace by irradiating it with laser light.

[0035] The energy density of the laser light irradiated from the laser light source onto the electrode composite layer inside the furnace is not particularly limited, for example, 0.1 W / cm². 2 More than 0.5W / cm 2 More than 1.0W / cm 2Above, 2.0 W / cm 2 Above, or 3.0 W / cm 2 Above, and may be, 20.0 W / cm 2 Below, 10.0 W / cm 2 Below, 7.0 W / cm 2 Below, or 4.0 W / cm 2 Below, and may be.

[0036] The distance between the laser light source and the electrode alloy 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. The laser light source may be arranged inside the furnace body or outside the furnace body.

[0037] The type of the 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 also 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 a multi-wavelength.

[0038] The output of the laser light source is not particularly limited and may be appropriately determined according to the irradiation region of the laser light, the irradiation time of the laser light, etc. The output 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 also be 100 kW or less, 70 kW or less, or 50 kW or less.

[0039] The number of laser light sources is not particularly limited and may be appropriately determined according to the irradiation region of the laser light, the irradiation time of the laser light, etc. The number of laser light sources may be, for example, 1 or more, 2 or more, 3 or more, 5 or more, or 10 or more, and may also be 30 or less, or 20 or less.

[0040] 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.

[0041] <Hot air supply section> At least one of the multiple hot air supply units is arranged within the furnace body to supply hot air from one side of the transport path toward the surface of the electrode mixture layer. Here, "one side of the transport path" means the front or back side in the width direction with respect to the transport path 120 in Figure 2(a). Also, "the surface of the electrode mixture layer" means the upper surface in the height direction of the electrode mixture layer 300 in Figure 2(a).

[0042] At least one of the multiple hot air supply units is arranged within the furnace body to supply hot air from the other side of the transport path toward the back surface of the electrode mixture layer. Here, "the other side of the transport path" means the far side in the width direction if one side of the transport path is the near side in the width direction, and the near side in the width direction if one side of the transport path is the far side in the width direction. Also, "the back surface of the electrode mixture layer" means the surface of the electrode mixture layer 300 that is in contact with the current collector layer 400 in Figure 2.

[0043] The amount of hot air supplied from the hot air supply unit (first hot air supply unit), which is positioned to supply hot air toward the surface of the electrode mixture layer, may be greater than the amount of hot air supplied from the hot air supply unit (second hot air supply unit), which is positioned to supply hot air toward the back surface of the electrode mixture layer. Since volatile vapors tend to accumulate on the surface side of the electrode mixture layer, it is preferable that the amount of hot air supplied from the first hot air supply unit be relatively large. The difference between the amount of hot air supplied from the first hot air supply unit and the amount of hot air supplied from the second hot air supply unit is not particularly limited, for example, 0.01 m 3 / s or more, 0.05m 3 / s or more, or 0.10m 3 It may be more than / s, and 0.50m 3 / s or less, 0.40m 3 / s or less, 0.30m3 / s or less, or 0.20m 3 It may be less than / s.

[0044] The positional relationship between the first hot air supply unit and the second hot air supply unit may be the same in the conveying direction, as shown in Figure 2(b). Alternatively, they may be positioned at different locations in the conveying direction.

[0045] The wind speed of the hot air in the hot air supply section 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. A higher wind speed increases the cooling effect of the current collector layer and the drying efficiency of the electrode composite 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.

[0046] The area of ​​the hot air supply port is not particularly limited and may be determined as appropriate considering the dimensions of the electrode mixture slurry, the required hot air velocity, etc. For example, the area could be 0.001 m². 2 More than 0.005m 2 More than 0.010m 2 More than 0.050m 2 Above, or 0.100m 2 It may be greater than or equal to 1,000m 2 Below, 0.500m 2 The following, or 0.300m 2 The following is also acceptable.

[0047] The distance between the hot air supply unit and the transport path is not particularly limited, but it is preferable to keep it short from the viewpoint of improving the drying efficiency of the electrode composite layer and the cooling efficiency of the current collector layer. The above distance may be 1000 mm or less, 500 mm or less, 300 mm or less, 200 mm or less, or 100 mm or less, and may be 10 mm or more, 30 mm or more, or 50 mm or more.

[0048] The hot air supply unit may radiate hot air in the width direction as shown in Figure 2(a), or it may supply hot air in a direction substantially parallel to the width direction. For example, the hot air supply unit may supply hot air at an angle of 30° or more, 45° or more, 60° or more, 75° or more, or 90° or more with respect to the transport direction, or it may supply hot air at an angle of 150° or less, 135° or less, 120° or less, 105° or less, or 90° or less.

[0049] The temperature of the hot air supplied from the hot air supply equipment may be 100°C or higher, 120°C or higher, or 140°C or higher. Higher hot air temperatures increase drying efficiency. Alternatively, the temperature of the hot air may be 200°C or lower, 180°C or lower, or 160°C or lower. Lower hot air temperatures increase the cooling effect of the current collector layer.

[0050] The number of hot air supply units is not particularly limited and may be, for example, two or more, four or more, six or more, eight or more, or ten or more, or it may be 30 or less, or 20 or less.

[0051] The method for generating the hot air supplied from the hot air supply unit is not particularly limited. For example, air heated by gas combustion, oil combustion, electric heating, etc., may be supplied to the hot air supply unit by a blower fan. From the viewpoint of drying the electrode mixture layer, the hot air is preferably of low humidity.

[0052] <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.

[0053] 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.

[0054] 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.

[0055] 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, and To supply hot air into the furnace body, A method for manufacturing an electrode stack, including [the specified element].

[0056] According to this disclosure, it is possible to provide a method for manufacturing an electrode laminate that enables uniform drying of the electrode composite layer and improves drying efficiency.

[0057] 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.

[0058] 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.

[0059] 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).

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The method of this disclosure includes supplying hot air into the furnace body. For details regarding the furnace body and the supply of hot air, refer to the description of the laser drying apparatus above.

[0064] <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.

[0065] (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.

[0066] 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), lithium iron phosphate (LFP:LiFePO4), lithium iron manganese phosphate (LMFP:LiFeMnPO4), and lithium nickel-cobalt-manganate (NCM:LiCO2O2). 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).

[0067] 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.

[0068] 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). 12Examples include, but are not limited to, those listed above.

[0069] 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.

[0070] The carbon material is not particularly limited and examples include hard carbon, soft carbon, and graphite.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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 Al x 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.

[0076] The sulfide solid electrolyte and oxide solid electrolyte may be glass or crystallized glass (glass ceramics).

[0077] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof.

[0078] 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.

[0079] (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.

[0080] 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.

[0081] 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. [Explanation of Symbols]

[0082] 100 Laser drying apparatus 110 Furnace body 120 Conveyor paths 121 Conveyor roller 130 Laser light sources 140 Hot air supply section 141 Hot air generator 142 Air intake duct 150 Exhaust equipment 200 laser beams 300 Electrode composite layer 400 Current collector layer

Claims

1. A laser drying apparatus for drying an electrode composite layer, The laser drying apparatus comprises a furnace body, a transport path, a laser light source, and a plurality of hot air supply units. The electrode composite layer is transported along the transport path within the furnace body in the transport direction. The laser light source is configured to heat the electrode composite layer being transported within the furnace body by irradiating it with laser light. At least one of the plurality of hot air supply units is arranged within the furnace body to supply hot air from one side of the transport path toward the surface of the electrode composite layer, At least one of the plurality of hot air supply units is arranged within the furnace body to supply hot air from the other side of the transport path toward the back surface of the electrode composite layer. Laser drying device.

2. The apparatus according to claim 1, wherein the amount of hot air supplied from a hot air supply unit arranged to supply hot air toward the surface of the electrode composite layer is greater than the amount of hot air supplied from a hot air supply unit arranged to supply hot air toward the back surface of the electrode composite layer.

3. 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, and To supply hot air into the furnace body, A method for manufacturing an electrode stack, including [the specified element].

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