Laser drying device

Abstract

[Problem] The present disclosure aims to provide a laser drying device with high drying efficiency. [Solution] A laser drying device (100) for drying an electrode composite layer, wherein the laser drying device (100) comprises a furnace body (110), a rectifier plate (120), a laser light source (130), and a hot air supply device (140), wherein the rectifier plate (120) is disposed inside the furnace body (110), disposed between the electrode composite layer and the laser light source (130), and configured to transmit laser light (200), wherein the laser light source (130) irradiates laser light (200) onto the electrode composite layer through the rectifier plate (120), and the hot air supply device (140) supplies hot air between the rectifier plate (120) and the electrode composite layer.

Description

Technology Field

[0001] The present disclosure relates to a laser drying device. Background Technology

[0002] Laser drying is known as a drying method for an electrode composite layer coated on a current collector layer. Compared to hot air drying, laser drying is characterized by lower energy consumption and a lower environmental burden. Various proposals have been made to improve drying efficiency regarding laser drying.

[0003] Patent Document 1 discloses a method for manufacturing an electrode body, comprising a conveying process in which an electrode body coated with at least one electrode material is conveyed by a conveying unit, and a drying process in which the electrode material is dried while the electrode body is conveyed by the conveying unit, wherein the drying process comprises an irradiation process in which the electrode material is dried by irradiating a laser onto the electrode material when the electrode body is conveyed to at least one first position in the conveying direction of the conveying unit, and a recovery process in which steam generated due to the laser irradiation onto the electrode material is recovered by a steam recovery unit provided at least one second position adjacent to the first position in the conveying direction. Patent Document 1 states that, according to the disclosure of Patent Document 1, when drying the electrode material by a laser, the decrease in drying efficiency can be suppressed.

[0004] Patent Document 2 discloses a method for manufacturing an electrode sheet, comprising a preparation process for preparing a coated sheet having a coated portion coated with an electrode material on a first surface of a current collection sheet having a longitudinal direction in a first direction, and a drying process for obtaining an electrode sheet by drying the coated portion by irradiating laser light from a plurality of laser heads arranged in a row in the first direction while conveying the coated sheet in the first direction, wherein the drying process supplies hot air with a temperature of 50°C or higher and a wind speed of 5 m / s or higher to a laser irradiation portion of the conveyed coated sheet, where laser light is irradiated from each laser head, during the period until the next laser irradiation. Patent Document 2 states that, according to the disclosure of Patent Document 2, it is possible to manufacture an electrode sheet in which the decrease in peel strength between the electrode layer and the current collection sheet is suppressed while suppressing the increase in drying time.

[0005] Meanwhile, when drying the electrode composite layer by supplying hot air to the electrode composite layer, a proposal is being made to place a rectifier plate inside the drying device.

[0006] Patent Document 3 discloses a drying device having a conveying path having a plurality of conveying rollers inside, comprising a hot air supply unit that is positioned opposite to the conveying path and is also arranged in plurality along the conveying path to supply hot air to the conveying path, and a straightening plate positioned between adjacent hot air supply units to guide the hot air along the conveying direction, wherein the straightening plate has a hot air exhaust unit that exhausts the hot air, and when the direction perpendicular to the conveying direction of the conveying path is the width direction, the shape of the hot air exhaust unit such that the length of the conveying direction at the center of the width direction is longer than the length of the conveying direction at the end of the width direction. Patent Document 3 states that, according to the disclosure of Patent Document 3, stagnation caused by interference of the hot air can be suppressed, thereby suppressing drying non-uniformity. Prior art literature

[0007] Japanese Patent Publication No. 2023-169591, Japanese Patent Publication No. 2024-020819, Japanese Patent Publication No. 2023-014755 The problem to be solved

[0008] When a laser light source is used for drying the electrode composite layer, it is necessary to secure a large distance between the laser light source and the workpiece to increase the laser irradiation area of ​​the electrode composite layer. In this case, it is necessary to increase the size of the furnace body.

[0009] Meanwhile, when performing laser drying, drying efficiency can be increased by supplying hot air to the electrode composite layer within the furnace. However, as mentioned above, if the size of the furnace is increased, the hot air diffuses, making it difficult to supply the hot air to the electrode composite layer, and there are cases where the expected drying efficiency is not achieved.

[0010] Accordingly, the present disclosure aims to provide a laser drying device with high drying efficiency. means of solving the problem

[0011] The present disclosure achieves the above objective by means of the following.

[0012] <Mode 1>

[0013] As a laser drying device for drying an electrode composite layer,

[0014] The above laser drying device comprises a furnace body, a rectifier plate, a laser light source, and a hot air supply device, and

[0015] The above rectifier plate is disposed inside the furnace body, is positioned between the electrode composite layer and the laser light source, and is also configured to transmit laser light.

[0016] The above laser light source irradiates laser light onto the electrode composite layer through the rectifier plate, and also

[0017] The above hot air supply device is a laser drying device that supplies hot air between the rectifier plate and the electrode composite layer.

[0018] <Mode 2>

[0019] The above-mentioned furnace body is additionally equipped with a laser-transmitting protective plate, and also

[0020] The device described in Embodiment 1, wherein the laser light source irradiates laser light onto the electrode composite layer via the protective plate and the rectifier plate.

[0021] <Mode 3>

[0022] An apparatus described in Embodiment 1 or 2 that satisfies the following relationship when the distance between the laser light source and the electrode composite layer is x and the distance between the rectifier plate and the electrode composite layer is y:

[0023] y / x≤0.15.

[0024] <Mode 4>

[0025] An apparatus described in any one of embodiments 1 to 3, wherein the transmittance of the laser light of the rectifier plate with respect to the laser light irradiated from the laser light source is 95.0% or higher.

[0026] <Mode 5>

[0027] A method for manufacturing an electrode laminate using an apparatus described in any one of embodiments 1 to 4, wherein

[0028] Irradiating laser light onto an electrode composite layer coated on a current collector layer, and

[0029] A method for manufacturing an electrode laminate, comprising supplying hot air into the furnace body. Effects of the invention

[0030] According to the present disclosure, a laser drying device with high drying efficiency can be provided. Brief explanation of the drawing

[0031] FIG. 1 is a schematic diagram for explaining a laser drying apparatus of the present disclosure. FIG. 2 is a schematic diagram for explaining a laser drying apparatus of the present disclosure. FIG. 3 is a schematic diagram for explaining a laser drying apparatus of the present disclosure. Specific details for implementing the invention

[0032] Laser Drying Device

[0033] As a laser drying device for drying an electrode composite layer,

[0034] The above laser drying device comprises a furnace body, a rectifier plate, a laser light source, and a hot air supply device, and

[0035] The above rectifier plate is disposed inside the furnace body, is positioned between the electrode composite layer and the laser light source, and is also configured to transmit laser light.

[0036] The above laser light source irradiates laser light onto the electrode composite layer through the rectifier plate, and also

[0037] The above hot air supply device is a laser drying device that supplies hot air between the rectifier plate and the electrode composite layer.

[0038] According to the present disclosure, a laser drying device with high drying efficiency can be provided.

[0039] The present inventors considered increasing drying efficiency by supplying hot air into the furnace body using a hot air supply device when laser drying an electrode composite layer. However, in order to increase the laser irradiation area of ​​the electrode composite layer, the distance between the laser light source and the electrode composite layer was significantly increased, causing the hot air to diffuse and making it difficult to supply hot air to the electrode composite layer.

[0040] In this regard, the present disclosures have found that the above problem can be solved by placing a rectifier plate between the electrode composite layer inside the furnace body and a laser light source, and by supplying hot air between the rectifier plate and the electrode composite layer. By placing the rectifier plate, the flow path of the hot air is adjusted, making it possible to supply the hot air appropriately to the electrode composite layer.

[0041] In addition, the laser light is supplied to the electrode composite layer through a rectifier plate; however, since the rectifier plate has high transmittance of the laser light, the laser light is supplied to the electrode composite layer without waste.

[0042] Specifically, for example, as shown in FIG. 1, the laser drying device (100) is equipped with a furnace body (110), a rectifier plate (120), a laser light source (130), and a hot air supply device (140). In addition, the laser drying device (100) has a conveying device (150), and by rotating the conveying roller (152), the electrode composite layer placed on the conveying belt (151) can be moved in the conveying direction at a constant speed. Thus, it is possible to bring the electrode composite layer into the furnace body (110) from the outside of the furnace body (110), and to take out the electrode composite layer from the inside of the furnace body (110) to the outside of the furnace body (110).

[0043] Inside the furnace body (110), a rectifier plate (120) is disposed between the laser light source (130) and the conveyor belt (151). The electrode composite layer on the conveyor belt (151), which is brought into the furnace body (110) by the conveyor device (150), is irradiated with laser light (200) from the laser light source (130) through the rectifier plate (120).

[0044] The hot air supply device (140) is composed of a hot air generator (141), a supply air duct (142), and a supply air nozzle (143). The hot air supply device (140) supplies hot air generated by the hot air generator (141) into the furnace body (110) via the supply air duct (142) and the supply air nozzle (143). Additionally, the hot air is supplied between the rectifier plate (120) and the electrode composite layer. Furthermore, the hot air is supplied in the conveying direction and in a direction opposite to the conveying direction. By supplying the hot air, the steam near the surface of the electrode composite layer, which is generated by laser irradiation, is removed by the hot air and is also discharged outside the furnace body (110) by the exhaust device (160). Additionally, by arranging the rectifier plate (120), the flow path of the hot air is adjusted, thereby increasing the drying efficiency of the electrode composite layer.

[0045] Embodiments of the present disclosure are described in detail below. Furthermore, the present disclosure is not limited to the embodiments described below and may be implemented with various modifications within the scope of the gist of the present disclosure.

[0046] The laser drying device of the present disclosure is a laser drying device for drying an electrode composite layer.

[0047] In relation to the present disclosure, "electrode composite" refers to a composition that can form an electrode active material layer as is or by additionally including other components. And, "electrode composite layer" refers to a layer that includes a dispersion medium in addition to the "electrode composite" and can form an electrode active material layer by coating and drying accordingly.

[0048] The laser drying device of the present disclosure comprises a furnace body, a rectifier plate, a laser light source, and a hot air supply device. Additionally, the laser drying device may further comprise a conveying device and an exhaust device.

[0049] The rectifier plate is positioned inside the furnace body and also between the electrode composite layer and the laser light source. By installing the rectifier plate, the space through which hot air is supplied can be narrowed, making it easier to supply hot air to the electrode composite layer.

[0050] The laser drying apparatus of the present disclosure may satisfy y / x ≤ 0.15, 0.14, 0.13, 0.12, 0.10, 0.08, or 0.05 when x is the distance between the laser light source and the electrode composite layer and y is the distance between the rectifier plate and the electrode composite layer. By satisfying the above relationship, the rectification effect of the hot air by arranging the rectifier plate is enhanced, and the drying efficiency is increased. In addition, y / x ≥ 0.01, 0.02, 0.03, or 0.04 may be satisfied.

[0051] Specifically, for example, as shown in FIG. 2, the electrode composite layer (300) is placed on a conveyor belt (151) and irradiated with laser light. The x is the shortest distance from the laser irradiation part of the laser light source (130) to the electrode composite layer (300) in the height direction. Also, the y is the shortest distance from the rectifier plate (120) to the electrode composite layer (300) in the height direction.

[0052] The distance (x) between the laser light source and the electrode composite layer is not specifically limited and may be appropriately determined by considering the irradiation area of ​​the laser light, etc. The distance (x) may, for example, be 300 mm or more, 500 mm or more, 1000 mm or more, 1500 mm or more, 2000 mm or more, or 5000 mm or less, 4000 mm or less, or 3000 mm or less. In addition, the laser light source may be placed inside the furnace body or outside the furnace body.

[0053] The distance (y) between the rectifier plate and the electrode composite layer is not specifically limited and may be appropriately determined by considering y / x or the thickness of the electrode composite layer. The distance (y) may, for example, be 5 mm or more, 10 mm or more, 30 mm or more, 50 mm or more, or 100 mm or more, or 750 mm or less, 500 mm or less, 400 mm or less, or 300 mm or less.

[0054] The energy density of the laser light irradiated from a laser light source onto the electrode composite layer inside the drying oven is not particularly limited, and, for example, 0.1 W / cm² 2 Above, 0.5W / cm² 2 Above, 1.0W / cm² 2 Above, 2.0W / cm² 2 Above, or 3.0W / cm² 2 It can be higher, 20.0 W / cm² 2 Below, 10.0W / cm² 2 Below, 7.0W / cm² 2 Less than, or 4.0W / cm² 2 It is acceptable to do the following.

[0055] <Restoration Plate>

[0056] The rectifier plate is configured to transmit laser light. By transmitting laser light, the laser light generated from the laser light source can be irradiated onto the electrode composite layer without waste.

[0057] The transmittance of the laser light of the rectifier plate may be 95.0% or higher with respect to the laser light irradiated from the laser light source. In addition, the transmittance may be 96.0% or higher, 97.0% or higher, 98.0% or higher, 99.0% or higher, 99.5% or higher, or 99.8% or higher, and may be 100.0% or lower or 99.9% or lower.

[0058] The transmittance of the laser light is the transmittance at that wavelength when the laser light is of a single wavelength, and the transmittance at the wavelength with the highest intensity when the laser light is of multiple wavelengths. The transmittance of the laser light can be measured by spectrophotometry using an ultraviolet-visible-near-infrared spectrophotometer (Solid Spec-3700DUV manufactured by Shimadzu Corporation).

[0059] The material of the rectifier plate is not particularly limited as long as it has laser transmittance, and may be a material having a heat resistance temperature higher than that of the hot air. The material of the rectifier plate may be, for example, glass, acrylic (PMMA), polycarbonate (PC), or polyetheretherketone (PEEK).

[0060] The glass may be, for example, quartz glass, soda-lime glass, lead glass, borosilicate glass, alkali glass, etc.

[0061] The dimensions of the rectifier plate are not specifically limited and may be dimensions that facilitate the supply of hot air to the electrode composite layer, or may be appropriately determined according to the dimensions of the furnace body, the position of the hot air supply nozzle, etc. For example, the length in the conveying direction of the rectifier plate (120) in FIG. 1 may be 30% or more, 50% or more, 70% or more, or 90% or more of the length in the width direction of the furnace body, or 100% or less, or 95% or less. In addition, the length in the direction (width direction) perpendicular to the conveying direction and the height direction of the rectifier plate (120) may be 30% or more, 50% or more, 70% or more, or 90% or more of the length in the width direction of the furnace body, or 100% or less, or 95% or less.

[0062] The thickness of the rectifier plate is not specifically limited and may be appropriately determined according to the material of the laser-transmitting protective plate, etc. The thickness of the rectifier plate may be, for example, 1 mm or more, 3 mm or more, 5 mm or more, 7 mm or more, or 10 mm or more, or 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0063] The rectifier plate may be inclined so as to be close to the electrode composite layer from the inlet of the furnace body toward the outlet, or inclined so as to be close to the electrode composite layer from the outlet of the furnace body toward the inlet.

[0064] The rectifier plate may be composed of a single plate or may be composed of multiple plate pieces joined together.

[0065] The method of maintaining the rectifier plate is not particularly limited and may include, for example, suspension, support, etc.

[0066] Noche

[0067] The furnace body may be equipped with a laser-transmitting protective plate. In this case, at least a portion of the outer casing of the furnace body may be a laser-transmitting protective plate. By providing a laser-transmitting protective plate, even if a laser light source is placed outside the furnace body, a laser can be irradiated into the furnace body (110) through the laser-transmitting protective plate.

[0068] Specifically, for example, as shown in FIG. 3, the furnace body (110) is equipped with an outer surface material (111) and a laser-transmitting protective plate (112), and the laser light source (130) is positioned outside the furnace body (110). Even if the inside of the furnace body (110) is at a high temperature, the heat is not transferred to the laser light source, so the risk of failure of the laser light source can be reduced.

[0069] The placement location of the laser-transmitting protective plate may be a location where the laser light generated from a laser light source placed outside the furnace body can be transmitted completely into the interior of the furnace body through the laser-transmitting protective plate.

[0070] The material of the exterior cladding of the furnace body is not particularly limited and may be, for example, steel, stainless steel, aluminum, etc. The furnace body may also undergo surface treatments such as galvanizing or powder coating.

[0071] The dimensions of the furnace body are not specifically limited and may be appropriately determined by considering the dimensions of the electrode composite layer, etc. Additionally, the furnace body may have an opening for introducing and removing the electrode composite layer by means of a conveying device.

[0072] (Laser-transmitting protective plate)

[0073] The transmittance of laser light of the laser-transmitting protective plate may be 95.0% or more, 96.0% or more, 97.0% or more, 98.0% or more, 99.0% or more, 99.5% or more, or 99.8% or more, and may be 100.0% or less or 99.9% or less.

[0074] The transmittance of the laser light is the transmittance at that wavelength when the laser light is of a single wavelength, and the transmittance at the wavelength with the highest intensity when the laser light is of multiple wavelengths. The transmittance of the laser light can be measured by spectrophotometry using an ultraviolet-visible-near-infrared spectrophotometer (Shimadzu Solid Spec-3700DUV).

[0075] The thermal conductivity of the laser-transmitting protective plate may be 1.50 W / (M·K) or less, 1.40 W / (M·K) or less, 1.38 W / (M·K) or less, 1.35 W / (M·K) or less, 1.30 W / (M·K) or less, 1.20 W / (M·K) or less, 1.10 W / (M·K) or less, or 1.00 W / (M·K) or less, or 0.10 W / (M·K) or more, 0.30 W / (M·K) or more, or 0.50 W / (M·K) or more. Due to the low thermal conductivity, the laser light source is protected without being affected by the temperature inside the furnace body.

[0076] Thermal conductivity can be measured by the heat flow meter method according to ASTM-E-1530.

[0077] The material of the laser-transmitting protective plate may be glass. Regarding glass, the description concerning the rectifier plate above may be referenced.

[0078] The laser-transmitting protective plate may be double-pane glass. By being double-pane glass, thermal insulation performance is improved. The double-pane glass may be one in which air, argon gas, krypton gas, etc., are sealed between multiple panes of glass.

[0079] The thickness of the laser-transmitting protective plate is not specifically limited and may be appropriately determined according to the material of the laser-transmitting protective plate, etc. The thickness of the laser-transmitting protective plate may be, for example, 1 mm or more, 3 mm or more, 5 mm or more, 7 mm or more, or 10 mm or more, or 30 mm or less, 25 mm or less, 20 mm or less, or 15 mm or less.

[0080] The dimensions of the laser-transmitting protective plate are not particularly limited and may be dimensions that allow the laser light generated from the laser light source to pass through the interior of the furnace without omission.

[0081] Laser light source

[0082] A laser light source irradiates laser light onto an electrode composite layer through a rectifier plate. Since the laser transmittance of the rectifier plate is high, the light energy generated from the laser light source can be supplied to the electrode composite layer without waste. Additionally, if the furnace body has a laser-transmitting protective plate, the laser light source may irradiate laser light onto the electrode composite layer through the protective plate and the rectifier plate. Accordingly, laser light can be irradiated onto the electrode composite layer even if the laser light source is placed outside the furnace body.

[0083] 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.

[0084] The output of the laser light source is not specifically limited and may be appropriately determined according to the laser light irradiation area, the laser light irradiation time, 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, or 100 kW or less, 70 kW or less, or 50 kW or less.

[0085] The number of laser light sources is not specifically limited and may be appropriately determined according to the laser light irradiation area, the laser light irradiation time, etc. The number of laser light sources may, for example, be 1 or more, 2 or more, 3 or more, 5 or more, or 10 or more, or 30 or fewer, or 20 or fewer.

[0086] The shape of the irradiation area of ​​the laser light on the electrode composite layer may be, for example, rectangular. In addition, the size of the irradiation area is not particularly limited and may be appropriately determined according to the dimensions of the electrode composite layer. The area of ​​the irradiation area is not particularly limited and, for example, 100 cm² 2 Over 1000cm 2 Over 5000cm 2 More than, or 10,000 cm 2 It can be more than that, 100,000cm 2 Below, 50,000cm 2 Less than, or 30,000 cm 2 It is acceptable to do the following.

[0087] Hot air supply device

[0088] The hot air supply device supplies hot air between the rectifier plate and the electrode composite layer. By supplying hot air to the electrode composite layer, steam on the surface of the electrode composite layer can be removed, thereby increasing drying efficiency.

[0089] The temperature of the hot air supplied from the hot air supply device may be 100°C or higher, 120°C or higher, 150°C or higher, 200°C or higher, 250°C or higher, or 300°C or higher, or 500°C or lower, 450°C or lower, 400°C or lower, or 350°C or lower.

[0090] The hot air supply device is not particularly limited and may supply air heated by, for example, gas combustion, oil combustion, electric heating, etc., to the electrode composite layer via a blower fan, blower duct, and blower nozzle. From the perspective of drying the electrode composite layer, it is preferable that the hot air has low humidity.

[0091] The direction of hot air supply is not particularly limited; for example, when the electrode composite layer is conveyed within the furnace body, the direction may be opposite to the conveying direction. Additionally, multiple blower nozzles may be arranged, and each may be positioned to have a different supply direction.

[0092] The speed of the hot air is not specifically 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. If the air speed is high, the drying efficiency of the electrode composite layer increases. In addition, the 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.

[0093] <Return Device>

[0094] The conveying device is not particularly limited and may be, for example, a roller conveyor, a belt conveyor, etc. The electrode composite layer may be placed on a conveying path, for example, and may be introduced into the furnace body and removed from the furnace body.

[0095] The electrode composite layer may be irradiated with laser light while moving inside the furnace body by means of a conveying device. In this case, the moving speed may be appropriately determined by considering the output of the laser light source, the amount of energy required for drying the electrode composite 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.

[0096] The conveying device may be connected to other devices, such as a coating device for the electrode composite layer and a winding device for the electrode laminate.

[0097] Exhaust equipment

[0098] The laser drying device may be equipped with an exhaust device. By having an exhaust device, steam generated from the electrode composite layer can be recovered, thereby increasing drying efficiency. Furthermore, the steam is water vapor or other gases.

[0099] The exhaust device may be configured to draw steam from the exhaust port, for example by an exhaust fan, and discharge the steam to the outside of the furnace body via an exhaust duct. The output of the exhaust fan and the dimensions of the exhaust port and exhaust duct may be appropriately determined by taking into account the amount of steam generated, etc.

[0100] It is desirable for the exhaust port to be positioned above the electrode composite layer and in a location that does not interfere with laser irradiation, from the perspective of increasing drying efficiency. The distance between the exhaust port and the electrode composite layer may be sufficient to allow for the suction of steam. The number of exhaust ports is not particularly limited.

[0101] Method for manufacturing an electrode laminate

[0102] A method for manufacturing an electrode laminate using the laser drying apparatus of the present disclosure,

[0103] Irradiating laser light onto an electrode composite layer coated on a current collector layer, and

[0104] A method for manufacturing an electrode laminate, comprising supplying hot air into the furnace body.

[0105] According to the present disclosure, a method for manufacturing an electrode laminate with high drying efficiency can be provided.

[0106] The method of the present disclosure is a method for manufacturing an electrode laminate using the laser drying apparatus of the present disclosure. For the laser drying apparatus, reference may be made to the description of the laser drying apparatus above.

[0107] The method of the present disclosure comprises irradiating a laser light onto an electrode composite layer coated on a current collector layer. For the electrode composite layer and the laser light, reference may be made to the description of the laser drying apparatus above. By irradiating the electrode composite layer with laser light, the dispersion medium contained in the electrode composite layer volatilizes, and an electrode active material layer is formed.

[0108] The dispersion medium contained in the electrode composite layer is not particularly limited and may be, for example, a nonpolar solvent such as heptane, xylene, and toluene, and a polar solvent such as water, a tertiary amine solvent, an ether solvent, a thiol solvent, a ketone solvent (e.g., diisobutyl ketone) and an ester solvent (e.g., butyl butyrate).

[0109] The content of the dispersion medium is not particularly limited, and, for example, may be an amount in which 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 an amount in which it is 80% or less, 75% or less, 70% or less, 65% or less, or 60% or less.

[0110] The method of coating 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.

[0111] The irradiation time of the laser light is not particularly limited and may be irradiated, for example, until the rate drying period of the electrode composite layer is reached. The irradiation time of the laser light may, for example, be 30 seconds or more, 1 minute or more, or 2 minutes or more, or 30 minutes or less, 20 minutes or less, or 10 minutes or less.

[0112] The method of the present disclosure includes supplying hot air into a furnace body, and regarding the furnace body and the supply of hot air, reference may be made to the description of the laser drying device above.

[0113] Electrode stack

[0114] The electrode laminate 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. Additionally, the electrode laminate may be a bipolar electrode laminate having a positive electrode active material layer and a negative electrode active material layer.

[0115] (Electrode active material layer)

[0116] When the electrode active material layer of the present disclosure is a positive electrode active material layer, the positive electrode active material layer comprises at least a positive electrode active material. Additionally, when the electrode active material layer is a negative electrode active material layer, the negative electrode active material layer comprises at least a negative electrode active material. The electrode active material layer may optionally further comprise a binder, a solid electrolyte, and a conductive additive, etc. The electrode active material layer may also comprise 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 may be appropriately determined according to the intended battery performance.

[0117] The material of the positive electrode active material is not particularly limited as long as it is capable of absorbing and releasing lithium ions. Examples of positive electrode active materials include lithium cobaltate (LiCoO2), lithium nickelate (LiNiO2), lithium manganate (LiMn2O4), lithium iron phosphate (LFP), lithium manganese iron phosphate (LMFP), and nickel-cobalt-manganese oxide (NCM: LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 O2), nickel, cobalt, and lithium aluminum (LiNi 0.8 (CoAl) 0.2 O2), Li 1+x Mn 2-x-y M y It may be a heterogeneous element-substituted Li-Mn spinel with a composition represented by O4 (where M is one or more metal elements selected from Al, Mg, Co, Fe, Ni, and Zn), but is not limited to these.

[0118] The shape of the positive electrode active material is not particularly limited, as long as it is a shape common for a positive electrode active material of a battery. The positive electrode active material may, for example, be in the form of particles. The positive electrode active material may be primary particles or secondary particles formed by the aggregation of multiple primary particles. Average particle size D of the positive electrode active material 50 Silver, for example, may be 1 nm or more, 5 nm or more, or 10 nm or more, and may also be 500 µm or less, 100 µm or less, 50 µm or less, or 30 µm or less. In addition, the average particle size D 50 The particle size (median diameter) at 50% of the cumulative value in the volume-based particle size distribution obtained by laser diffraction and scattering methods.

[0119] As a negative electrode active material, various materials may be employed in which the potential for absorbing and releasing lithium ions (charge / discharge potential) is a lower potential compared to the positive electrode active material of the present disclosure. The material of the negative electrode active material is not particularly limited and may be metallic lithium, or may be a material capable of absorbing and releasing metal ions such as lithium ions. Examples of materials capable of absorbing and releasing metal ions such as lithium ions include alloy-based negative electrode active materials, carbon materials, or lithium titanate (Li4Ti5O2). 12 Examples include ), but are not limited to these.

[0120] As for alloy-based negative electrode active materials, they are not particularly limited and, for example, Si alloy-based negative electrode active materials or Sn alloy-based negative electrode active materials may be used. Si alloy-based negative electrode active materials include silicon, silicon oxide, silicon carbide, silicon nitride, or solid solutions thereof. In addition, Si alloy-based negative electrode active materials may include metal elements other than silicon, for example, Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Sn, Ti, etc. Sn alloy-based negative electrode active materials include tin, tin oxide, tin nitride, or solid solutions thereof. In addition, Sn alloy-based negative electrode active materials may include metal elements other than tin, for example, Fe, Co, Sb, Bi, Pb, Ni, Cu, Zn, Ge, In, Ti, Si, etc.

[0121] Carbon materials are not particularly limited and, for example, hard carbon, soft carbon, graphite, etc.

[0122] The shape of the negative electrode active material is not particularly limited, but any shape common to negative electrode active materials of a battery is sufficient. The negative electrode active material may, for example, be in the form of particles or sheets.

[0123] 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, but may be used as a single type or as a combination of two or more types.

[0124] 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.

[0125] Examples of sulfide solid electrolytes include, but are not limited to, sulfide-based amorphous solid electrolytes, sulfide-based crystalline solid electrolytes, or azirodite-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 etc.), LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li 7-x PS 6-x Cl x Etc.; or combinations thereof, but are not limited to these.

[0126] As an example of an oxide solid electrolyte, 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 Ti2-x (PO4)3, Li 1+x Al x Ge 2-x (PO4)3, Li3PO4, or Li 3+x PO 4-x N x (LiPON) etc.; or combinations thereof may be cited, but are not limited to these.

[0127] Sulfide solid electrolytes and oxide solid electrolytes may be glass or crystallized glass (glass ceramic).

[0128] Examples of polymer electrolytes include polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof, but are not limited to these.

[0129] The conductive agent is not particularly limited. The conductive agent may be, for example, vapor-grown carbon fiber (VGCF), acetylene black (AB), Ketjen black (KB), carbon nanotubes (CNT), carbon nanofibers (CNF), etc., but is not limited to these. The conductive agent may be, for example, in the form of particles or fibers, and its size is not particularly limited. The conductive agent is not particularly limited, but may be used alone or may be used in combination of two or more types.

[0130] (All floors of the house)

[0131] The material of the current collector layer is not particularly limited, but any material commonly used as a conductor for the electrode of a battery may be appropriately adopted. Examples of materials for the conductor layer include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, stainless steel, etc., but are not limited to these. Furthermore, the current collector layer may be a metal foil or a substrate on which the above metals are plated or deposited.

[0132] The shape of the current collector layer is not particularly limited, but examples include a thin film shape, a plate shape, or a mesh shape. Among these, a thin film shape is preferred.

[0133] 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.

[0134] [Example]

[0135] The present invention will be specifically explained by examples and comparative examples, but the present invention is not limited thereto.

[0136] Preparation of the Laser Drying Device

[0137] Laser drying apparatuses were prepared as Examples 1 to 5 with a configuration as shown in Fig. 1, wherein the distance (y) between the rectifier plate and the electrode composite layer was adjusted as shown in Table 1. In addition, the distance (x) between the laser light source and the electrode composite layer was 1500 mm. Furthermore, a laser drying apparatus identical to Examples 1 to 5, except that a rectifier plate was not installed, was prepared as Comparative Example 1.

[0138] The material of the rectifier plate is quartz glass, and the transmittance of the laser light generated from a 20 kW output laser light source was 99.8% at a wavelength of 970 nm. The transmittance of the laser light was measured by spectrophotometry using an ultraviolet-visible-near-infrared spectrophotometer (Solid Spec-3700DUV manufactured by Shimadzu Corporation).

[0139] The area of ​​the rectifier plate is 90% of the bottom area of ​​the furnace body (length in the conveying direction × length in the width direction), and it is positioned so that the hot air supplied from the supply nozzle does not leak upward in the height direction of the rectifier plate.

[0140] The temperature of the hot air supplied from the hot air supply device is 120℃.

[0141] Evaluation of Drying Efficiency of Electrode Composite Layer

[0142] <Fabrication of Electrode Composite Layer>

[0143] Lithium cobaltate (LiCoO2) as the electrode active material and styrene-butadiene copolymer (SBR) as the binder were weighed at a mass ratio of 97.5:2.5 and mixed with ion-exchanged water at a solid fraction of 55% to prepare an electrode composite layer. Additionally, the basis weight of the electrode composite layer was 35 mg / cm². 2 was.

[0144] <Evaluation of Drying Time>

[0145] The above electrode composite layer was coated to a thickness of 400 μm on an aluminum foil serving as a current collector layer, and the same was introduced into the laser drying apparatus of Examples 1 to 5, and laser light was irradiated onto an area including the center of the electrode composite layer.

[0146] The temperature of the center of the electrode composite layer was continuously measured by a radiation thermometer, and the timing at which the center of the electrode composite layer entered falling-rate drying was defined as the drying time. The drying times in the laser drying apparatus of Examples 1 to 5 are shown in Table 1.

[0147]

[0148] From Examples 1 to 5 and Comparative Example 1 of Table 1, it can be understood that by placing a rectifier plate between the electrode composite layer in the furnace and the laser light source, hot air is easily supplied to the electrode composite layer, and the drying time is shortened.

[0149] In addition, from Examples 1 to 5 of Table 1, it can be understood that as y / x decreases, hot air becomes easier to supply to the electrode composite layer, and the drying time becomes shorter. Explanation of the symbols

[0150] 100 Laser Drying Device 110 Noche 111 External Equipment 112 Laser-transmitting protective plate 120 rectifiers 130 laser light source 140 hot air supply device 141 Hot Air Generator 142 supply air duct 143 Supply Nozzle 150 return devices 151 Return Belt 152 return rollers 160 exhaust devices 200 laser beams 300 electrode composite layer

Claims

Claim 1 A laser drying device for drying an electrode composite layer, wherein the laser drying device comprises a furnace body, a rectifier plate, a laser light source, and a hot air supply device, wherein the rectifier plate is disposed inside the furnace body and is disposed between the electrode composite layer and the laser light source and is configured to transmit laser light, wherein the laser light source irradiates laser light onto the electrode composite layer through the rectifier plate, and wherein the hot air supply device supplies hot air between the rectifier plate and the electrode composite layer. Claim 2 An apparatus according to claim 1, wherein the furnace body is equipped with a laser-transmitting protective plate, and the laser light source irradiates laser light onto the electrode composite layer through the protective plate and the rectifier plate. Claim 3 An apparatus according to claim 1 or 2 that satisfies the following relationship when the distance between the laser light source and the electrode composite layer is x and the distance between the rectifier plate and the electrode composite layer is y: y / x ≤ 0.

15. Claim 4 A device according to claim 1 or 2, wherein the transmittance of the laser light of the rectifier plate with respect to the laser light irradiated from the laser light source is 95.0% or higher. Claim 5 A method for manufacturing an electrode laminate using the apparatus described in claim 1 or 2, comprising irradiating a laser light onto an electrode composite layer coated on a current collector layer and supplying hot air into the furnace body.

Images