Electrode material for secondary battery, method for manufacturing same, and apparatus for manufacturing same

Abstract

Disclosed are an electrode material for a secondary battery, which is manufactured through a dry process such that separation of active materials can be prevented, and a manufacturing method and a manufacturing apparatus capable of mass-producing the electrode material for a secondary battery. The electrode material for a secondary battery comprises a current collector, an active material layer, and a protective layer. The current collector has an upper surface and a lower surface. The active material layer is attached to each of the upper surface and the lower surface of the current collector through an adhesive layer. The protective layer is attached to each of the upper surface and the lower surface of the active material layer.

Description

Electrode material for secondary batteries, manufacturing method thereof, and manufacturing apparatus thereof

[0001] The present invention relates to an electrode material for a secondary battery, a method for manufacturing the same, and a manufacturing apparatus therefor.

[0002] Today, with the advancement of the information age, mobile electronic devices owned by individuals are becoming widely used. These mobile electronic devices inevitably require batteries to operate.

[0003] In the past, primary batteries, such as manganese batteries and alkaline batteries, were mainly used, which were used once and discarded when discharged. However, recently, secondary batteries, which can be recharged after discharge and used repeatedly, are being widely used instead of primary batteries, which are disadvantageous in terms of environmental pollution and cost of discarded batteries.

[0004] These secondary batteries typically consist of a cathode, anode, electrolyte, and separator. Among these, the cathode and anode are the most crucial materials that determine the battery's capacity, lifespan, and charging speed. The cathode, as a lithium-ion source, determines the battery's capacity and average voltage, while the anode determines the charging speed and lifespan.

[0005] In order to manufacture electrode materials such as positive or negative electrode materials, in Korean Patent Publication No. 10-2006-0025230, "Dry particle-based electrochemical device and manufacturing method thereof," a dry active material and a dry binder are mixed at room temperature to form a matrix of the dry active material, and a high-temperature process using a jet mill is performed to dry fiberize a fluororesin such as PTFE and PVDF to develop a dry active material sheet. However, although PTFE has an advantage in fiberization for forming an active material sheet, lithium resistance increases due to a side reaction during lithium charge and discharge.

[0006] To solve this problem, Korean Patent Publication No. 10-2016-0145043, "Dry energy storage device electrode and manufacturing method thereof," used a composite binder including PTFE and PVDF or a copolymer, and Korean Patent Publication No. 10-2022-0100240, "Dry binder and lithium secondary battery electrode including same and manufacturing method thereof," used a mixture of PTFE and CMC or PAA to minimize the resistance of lithium.

[0007] In the case of electrode materials manufactured by such a dry process, there is a problem that the binding force of the binder is weak due to the wet process.

[0008] [Prior Art Literature]

[0009] [Patent Document]

[0010] (Patent Document 1) Republic of Korea Publication No. 10-2016-0145043

[0011] (Patent Document 2) Republic of Korea Publication Patent No. 10-2022-0100240

[0012] Accordingly, the problem to be solved by the present invention is to provide an electrode material for a secondary battery that can be manufactured through a dry process while preventing the detachment of an active material.

[0013] Another problem to be solved by the present invention is to provide a manufacturing method and manufacturing apparatus capable of mass-producing such electrode materials for secondary batteries.

[0014] An exemplary embodiment of the present invention for solving these problems comprises an electrode material for a secondary battery, comprising a current collector, an active material layer, and a protective layer. The current collector has an upper surface and a lower surface. The active material layer is attached to the upper surface and the lower surface of the current collector, respectively, via an adhesive layer. The protective layer is attached to the upper surface and the lower surface of the active material layer, respectively.

[0015] As an example, the active material layer may include active material particles and a binder.

[0016] As an example, the active material layer may be composed of three layers, the first layer and the third layer may include active material particles and a binder, and the second layer in the middle may include only a binder.

[0017] At this time, the porosity of the second layer constituting the active material layer may be in the range of 30% to 50%.

[0018] Additionally, the binder of the second layer constituting the above-described active material layer may have a pre-bonded structure.

[0019] For example, the binder of the second layer constituting the active material layer may include PVDF (Polyvinylidene fluoride).

[0020] As an example, the active material particles may be negative electrode active material particles including at least one of carbon, silicon, tin, antimony, and graphene.

[0021] At this time, the entire body may be copper foil (Cu).

[0022] As an example, the active material particles may be positive electrode active material particles composed of aluminum (Al), nickel (Ni), titanium (Ti), tungsten (W), iron (Fe), chromium (Cr), manganese (Mn), alloys thereof, and combinations thereof.

[0023] At this time, the entire body may be aluminum foil (Al).

[0024] As an example, the binder may include at least one of PVDF (Polyvinylidene fluoride), elastomer, SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), NBR (nitrile butadiene rubber), butadiene, PAA (polyacrylic acid), PP (polypropylene), and PE (polyethylene).

[0025] As an example, the active material layer may further include conductive particles dispersed within the binder.

[0026] As an example, the conductive particles may include at least one of carbon black, acetylene black, VGCF (Vapor grown carbon fiber), CNT, and graphene.

[0027] As an example, the adhesive layer may be a polymer resin mixed with a conductor.

[0028] As an example, the polymer resin may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0029] As an example, the protective layer may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0030] As an example, the thickness of the protective layer may be in the range of 1 μm to 10 μm.

[0031]

[0032] A method for manufacturing an electrode material for a secondary battery according to an exemplary embodiment of the present invention includes a step of supplying a mixed powder to an upper portion of a lower release film that advances from a first supply roller to a first take-up roller, a step of supplying a mixed powder to an upper portion of a current collector that advances from a second supply roller to a second take-up roller from above the lower release film, and a step of pressurizing an upper portion of an upper release film that advances from a third supply roller to a third take-up roller from above the current collector.

[0033] As an example, the mixed powder may be a mixture of active material particles and binder particles.

[0034] As an example, the mixed powder may be manufactured through a step of mixing a binder, active material particles, and an organic solvent, a step of drying to remove the organic solvent, thereby forming binder-coated active material particles, and a step of mixing the binder-coated active material particles and the binder-not-coated active material particles at a certain ratio.

[0035] As an example, in the step of mixing the binder-coated active material particles and the binder-uncoated active material particles at a certain ratio, the binder-coated active material particles and the binder-uncoated active material particles may be mixed at a ratio of 1:1.

[0036] At this time, in the step of mixing the binder, active material particles, and organic solvent, a conductive material can be further mixed.

[0037] As an example, in the step of supplying mixed powder to the upper part of the lower release film proceeding from the first supply roller to the first take-up roller and in the step of supplying mixed powder to the upper part of the current collector proceeding from the second supply roller to the second take-up roller on the upper part of the lower release film, the mixed powder may be supplied so that a first layer in which a binder and an active material are mixed, a second layer composed only of an active material, and a third layer in which a binder and an active material are mixed are laminated.

[0038] As an example, the active material particles may be negative electrode active material particles including at least one of carbon, silicon, tin, antimony, and graphene.

[0039] At this time, the entire body may be copper foil (Cu).

[0040] As an example, the active material particles may be positive electrode active material particles composed of aluminum (Al), nickel (Ni), titanium (Ti), tungsten (W), iron (Fe), chromium (Cr), manganese (Mn), alloys thereof, and combinations thereof.

[0041] At this time, the entire body may be aluminum foil (Al).

[0042] As an example, a protective layer may be attached to the upper surface of the lower release film and the lower surface of the upper release film.

[0043] As an example, the protective layer may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0044] As an example, the thickness of the protective layer may be in the range of 1 μm to 10 μm.

[0045] At this time, the thickness of the lower and upper release films may be two to four times the thickness of the protective layer.

[0046] As an example, before the step of supplying the mixed powder to the upper portion of the current collector from the second supply roller to the second take-up roller on the upper portion of the lower release film, an adhesive layer may be formed on the upper and lower surfaces of the current collector.

[0047] As an example, the adhesive layer may be a polymer resin mixed with a conductor.

[0048] As an example, the polymer resin may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0049] As an example, the step of pressing the upper portion of the upper release film from the third supply roller to the third take-up roller on the upper portion of the collector may be performed by a fusion machine.

[0050] As an example, the fusion machine may be an ultrasonic fusion machine.

[0051] As an example, the fusion device may include a lower pressure press and an upper pressure press respectively disposed below and above the current collector.

[0052] As an example, the lower and upper presses can move a certain distance in a pressurized state in the direction of travel, release the pressurization, and then return to the original position so that pressurization can proceed.

[0053] As an example, the first pressurizing position and the second pressurizing position may be adjacent or overlap to a certain extent.

[0054] As an example, the method for manufacturing an electrode material for a secondary battery may further include a step of transferring the protective layers attached to the upper and lower surfaces, respectively, of the lower and upper transfer release films, which are arranged behind the first to third winding rollers and advance from the fourth and fifth supply rollers, which are arranged below and above the current collector, respectively, to the fourth and sixth winding rollers, respectively, to the lower and upper surfaces, respectively, of the active layer formed on the lower and upper surfaces, respectively, of the current collector.

[0055] As an example, the protective layer may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0056] As an example, the thickness of the protective layer may be in the range of 1 μm to 10 μm.

[0057] As an example, the thickness of the lower and upper release films may be two to four times the thickness of the protective layer.

[0058]

[0059] An electrode material manufacturing device for a secondary battery according to an exemplary embodiment of the present invention includes a first supply roller and a first take-up roller, a second supply roller and a second take-up roller, and a third supply roller and a third take-up roller. The first supply roller and the first take-up roller advance a lower release film. The second supply roller and the second take-up roller are disposed above the first supply roller and the first take-up roller and advance a current collector. The third supply roller and the third take-up roller are disposed above the first supply roller and the first take-up roller and advance an upper release film.

[0060] As an example, the first supply roller may be arranged in front of the second supply roller, the second supply roller may be arranged in front of the third supply roller, and the third winding roller may be arranged in front of the second winding roller.

[0061] As an example, the device for manufacturing a negative electrode material for a secondary battery may further include a fusing device disposed between the third supply roller and the third winding roller.

[0062] As an example, the fusion machine may be an ultrasonic fusion machine.

[0063] As an example, the fusion press may include a lower press that applies pressure from the bottom to the top, and an upper press that applies pressure from the top to the bottom.

[0064] As an example, the lower and upper presses can move a certain distance in a pressurized state in the direction of travel, release the pressurization, and then return to the original position so that pressurization can proceed.

[0065] As an example, the device for manufacturing electrode materials for secondary batteries may further include a pair of roll presses arranged at least on one of the front and rear ends of the fusion device to press the lower surface of the lower release film and the upper surface of the upper release film.

[0066] For example, the roll press can pressurize at a temperature of 60°C to 150°C.

[0067] As an example, the electrode material manufacturing device for a secondary battery may further include a first hopper and a second hopper. The first hopper is disposed between the first supply roller and the second supply roller, and supplies the mixed powder to the upper portion of the lower release film. The second hopper is disposed between the second supply roller and the third supply roller, and supplies the mixed powder to the upper portion of the current collector.

[0068] As an example, the secondary battery electrode material manufacturing device may further include a pair of first hoppers arranged between the first supply roller and the second supply roller to supply mixed powder to the upper portion of the lower release film, a pair of second hoppers arranged between the second supply roller and the third supply roller to supply mixed powder to the upper portion of the current collector, and a third hopper arranged between at least one of the pair of first hoppers and the pair of second hoppers to supply binder powder.

[0069] As an example, the electrode material manufacturing device for a secondary battery may further include an application unit disposed below the second supply roller to apply an adhesive to the lower and upper surfaces of the current collector.

[0070] For example, the application unit may include a first spray that sprays adhesive onto the lower surface of the entire body and a second spray that sprays adhesive onto the upper surface of the entire body.

[0071] Preferably, the electrode material manufacturing device for such a secondary battery may further include a first scraper and a second scraper for scraping the adhesive applied to the lower and upper surfaces of the electrode body to a constant thickness, respectively.

[0072] As an example, the electrode material manufacturing device for a secondary battery may further include a fourth supply roller, a fourth take-up roller, a fifth supply roller, and a fifth take-up roller. The fourth supply roller and the fourth take-up roller are arranged at the rear end of the first take-up roller, below the current collector, to advance the lower transfer release film. The fifth supply roller and the fifth take-up roller are arranged at the rear end of the second take-up roller, above the current collector, to advance the upper transfer release film.

[0073] As an example, the electrode material manufacturing device for a secondary battery may further include a pair of roll presses arranged behind the fourth supply roller and the fifth supply roller.

[0074] In this way, according to the electrode material for a secondary battery, the manufacturing method thereof, and the manufacturing apparatus thereof according to the present invention, the protective layer covers the active material layer, and thus the detachment of the active material layer can be prevented.

[0075] In addition, by forming the thickness of the protective layer in the range of 1 ㎛ to 10 ㎛, the penetration of the secondary battery electrolyte can be facilitated while protecting the active material layer.

[0076] In addition, in the process of forming a protective layer, precise control of the thickness is possible by forming it on a release film and then transferring it rather than forming it directly on the active material layer.

[0077] Additionally, mass production can be achieved by manufacturing through a continuous process using rollers.

[0078] In addition, by configuring the upper and lower presses to be able to move while under pressure, it is possible to prevent loss of material and a decrease in production speed.

[0079] FIG. 1 is a schematic cross-sectional view illustrating a negative electrode material for a secondary battery according to an exemplary embodiment of the present invention.

[0080] FIG. 2 is a schematic cross-sectional view illustrating a negative electrode material for a secondary battery according to another exemplary embodiment of the present invention.

[0081] Figure 3 is a flowchart illustrating a method for manufacturing a negative electrode material for a secondary battery according to an exemplary embodiment of the present invention.

[0082] FIG. 4 is a flowchart illustrating a method for manufacturing a mixed powder of one embodiment illustrated in FIG. 3.

[0083] Figure 5 is a schematic diagram illustrating a device for manufacturing a negative electrode material for a secondary battery according to an exemplary embodiment of the present invention.

[0084] Figures 6 to 8 are conceptual diagrams illustrating the operation of the lower pressure press and the upper pressure press illustrated in Figure 5.

[0085] Figures 9 and 10 are conceptual diagrams showing the first and second pressing positions by the lower pressing press and the upper pressing press shown in Figures 6 to 8.

[0086] Figure 11 is a schematic diagram illustrating a device for manufacturing a negative electrode material for a secondary battery according to another exemplary embodiment of the present invention.

[0087] Fig. 12 is a schematic diagram illustrating a device for manufacturing a negative electrode material for a secondary battery according to another exemplary embodiment of the present invention.

[0088] Fig. 13 is a schematic diagram illustrating a device for manufacturing a negative electrode material for a secondary battery according to another exemplary embodiment of the present invention.

[0089] Figure 14 is a photograph showing a mark on a cathode active material with relatively weak durability, which was pressed by strong press pressure from the lower and upper presses during the manufacture of the cathode material.

[0090] Fig. 15 is a photograph showing the second layer of the active material layer illustrated in Fig. 2.

[0091] The present invention is susceptible to various modifications and takes various forms. Specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components. In the accompanying drawings, the dimensions of structures may be exaggerated to enhance clarity of the present invention.

[0092] While terms like "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0093] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. In addition, the meaning of A and B being "connected" or "coupled" includes a case where, in addition to A and B being directly connected or coupled, another component C is included between A and B so that A and B are connected or coupled.

[0094] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be construed in an idealized or overly formal sense unless explicitly defined herein. Furthermore, in the claims for method inventions, the order of the steps may be interchanged, unless the order of the steps is explicitly stated.

[0095] Additionally, the configurations individually described in each embodiment may also be applied in other embodiments.

[0096]

[0097] Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

[0098] FIG. 1 is a schematic cross-sectional view illustrating a negative electrode material for a secondary battery according to an exemplary embodiment of the present invention.

[0099] Referring to FIG. 1, an electrode material (1000) for a secondary battery according to an exemplary embodiment of the present invention includes a current collector (1100), an active material layer (1300), and a protective layer (1400).

[0100] The above-mentioned collector (1100) has an upper surface and a lower surface.

[0101] The above active material layer (1300) is attached to the upper surface and the lower surface of the current collector (1100) via an adhesive layer (1200), respectively. As an example, the active material layer (1300) may include active material particles (1310) and a binder (1320).

[0102] As an example, the active material particles (1310) may be negative electrode active material particles including at least one of carbon, silicon, tin, antimony, and graphene. In this case, the current collector (1100) may be copper foil (Cu).

[0103] As an example, the active material particles (1310) may be positive electrode active material particles composed of aluminum (Al), nickel (Ni), titanium (Ti), tungsten (W), iron (Fe), chromium (Cr), manganese (Mn), alloys thereof, and combinations thereof. In this case, the current collector (1100) may be aluminum foil (Al).

[0104] As an example, the binder (1320) may include at least one of PVDF (Polyvinylidene fluoride), elastomer, SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), NBR (nitrile butadiene rubber), butadiene, PAA (polyacrylic acid), PP (polypropylene), and PE (polyethylene).

[0105] As an example, the active material layer (1300) may further include conductive particles (1330) dispersed within the binder (1320).

[0106] As an example, the conductive particles (1330) may include at least one of carbon black, acetylene black, VGCF (Vapor grown carbon fiber), CNT, and graphene.

[0107] As an example, the adhesive layer (1200) may be a mixture of a polymer resin and a conductor or a conductive polymer resin.

[0108] As an example, the polymer resin may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0109] The protective layer (1400) is attached to the upper and lower surfaces of the active material layer (1300), respectively. The protective layer (1400) covers and protects the surface of the active material layer (1300). The protective layer (1400) may be formed of the same material as the adhesive layer (1200).

[0110] When the active material layer (1300) is formed by a wet process, after the binder (1320) is completely dissolved by the solvent, the solvent is evaporated so that the binder (1320) binds the active material particles (1310) and the conductive particles (1330), so that the binder (1320) completely surrounds the active material particles (1310) and the conductive particles (1330), and thus the bonding force between the particles becomes stronger.

[0111] However, in the case of proceeding with a dry process as described later in the present invention, the binder (1320) powder is partially melted by heat and then dried, so the active material layer (1300) is relatively weaker than in a wet process. In particular, inside the secondary battery, the active material layer (1300) becomes more vulnerable and can be easily damaged due to exposure to the electrolyte.

[0112] To solve this problem, in the present invention, the protective layer (1400) protects the active material layer (1300).

[0113] As an example, the protective layer (1400) may include a thermosetting resin or a thermoplastic resin.

[0114] As an example, the thickness of the protective layer (1400) may be in the range of 1 μm to 10 μm. If the thickness of the protective layer (1400) is too thin, the first layer (1610) is vulnerable to protection, and conversely, if it is too thick, the electrolyte of the secondary battery has difficulty penetrating, so that the electrode material cannot perform its function.

[0115]

[0116] Fig. 2 is a schematic cross-sectional view illustrating a negative electrode material for a secondary battery according to another exemplary embodiment of the present invention. The negative electrode material for a secondary battery illustrated in Fig. 2 is substantially identical to the negative electrode material for a secondary battery illustrated in Fig. 1 except for the active material layer (1300). Therefore, identical or similar components are given the same reference numerals, and redundant descriptions are omitted.

[0117] Referring to FIG. 2, the active material layer (1300) is composed of three layers, a first layer (1300a), a second layer (1300b), and a third layer (1300c) that are sequentially laminated. The first layer (1300a) and the third layer (1300c) include active material particles and a binder, and the second layer (1300b) in the middle includes only a binder.

[0118] As shown in Fig. 1, when the active material layer (1300) is formed as a single layer, some of the active material layer (1300) may be damaged during the mass production process described below. That is, since the active material layer (1300) has poor flexibility and bendability, it is formed hard and may be damaged when rolled. To solve this problem, when a second layer formed only with a binder is added, bendability and flexibility are added to the active material layer (1300), thereby preventing damage.

[0119] At this time, the second layer (1300b) constituting the active material layer (1300) includes a plurality of pores, and the porosity may be in the range of 30% to 50%. If the porosity is formed to be 30% or less, the insertion and de-insertion process of lithium ions becomes difficult, resulting in increased resistance. If the porosity exceeds 50%, the bonding strength becomes weak, and the first layer (1300a) or the third layer (1300c) may be separated from the second layer (1300b).

[0120] Meanwhile, the binder of the second layer constituting the active material layer preferably has a linear bonding structure, as shown in Fig. 15. As such a binder, PVDF (Polyvinylidene fluoride) can be applied. That is, in the case of a spherical binder, point contact is made, and the bonding strength is low compared to the pores formed. However, in the case of a linear bonding structure, even if many pores are formed, a strong bonding strength is imparted.

[0121]

[0122] Figure 3 is a flowchart illustrating a method for manufacturing a negative electrode material for a secondary battery according to an exemplary embodiment of the present invention.

[0123] Referring to FIGS. 1 to 3, a method for manufacturing an electrode material for a secondary battery according to an exemplary embodiment of the present invention includes a step (S110) of supplying a mixed powder to an upper portion of a lower release film proceeding from a first supply roller to a first take-up roller, a step (S120) of supplying a mixed powder to an upper portion of a current collector proceeding from a second supply roller to a second take-up roller above the lower release film, and a step (S130) of pressing an upper portion of an upper release film proceeding from a third supply roller to a third take-up roller above the current collector. The order of the step (S110) of supplying a mixed powder to an upper portion of a lower release film proceeding from a first supply roller to a first take-up roller, and the step (S120) of supplying a mixed powder to an upper portion of a current collector proceeding from a second supply roller to a second take-up roller above the lower release film may be reversed, or may be performed simultaneously.

[0124] As described above, as an example, the mixed powder may be a mixture of active material particles (1310) and binder particles (1320). Here, the mixed powder may be a simple mixture of active material particles and binder particles, or may be a mixed powder manufactured by the process of FIG. 4.

[0125] As an example, the active material particles (1310) may be negative electrode active material particles including at least one of carbon, silicon, tin, antimony, and graphene. In this case, the current collector (1100) may be copper foil (Cu).

[0126] As an example, the active material particles (1310) may be positive electrode active material particles composed of aluminum (Al), nickel (Ni), titanium (Ti), tungsten (W), iron (Fe), chromium (Cr), manganese (Mn), alloys thereof, and combinations thereof. In this case, the current collector (1100) may be aluminum foil (Al).

[0127] As an example, a protective layer (1400) may be attached to the upper surface of the lower release film (LSF) and the lower surface of the upper release film (USF).

[0128] As an example, the protective layer (1400) may include the same material as the adhesive layer (1200).

[0129] As an example, the thickness of the protective layer (1400) may be in the range of 1 μm to 10 μm.

[0130] At this time, the thickness of the lower and upper release films (LSF, USF) may be 2 to 4 times the thickness of the protective layer (1400). If the release film (1500) becomes too thick, the bonding strength between the protective layer (1400) and the active material layer (1300) is reduced in S130. To explain in more detail, in order to control the thickness of the protective layer (1400), the protective layer (1400) is not formed directly on the active material layer (1300), but is applied to the lower and upper release films (LSF, USF) and cured, and then the lower and upper release films (LSF, USF) are pressed so that the protective layer (1400) is transferred from the lower and upper release films (LSF, USF) to the upper portion of the active material layer (1300). At this time, the elastic lower and upper release films (LSF, USF) absorb the pressing, so that the protective layer (1400) is not pressed against the active material layer (1300).

[0131] In this way, in the present invention, the protective layer (1400) is not formed by applying a resin on top of the active material layer (1300), but is transferred from the lower and upper release films (LSF, USF). If the resin is directly applied on top of the active material layer (1300), it is not easy to control the thickness of the protective layer (1400). However, in the present invention, if the protective layer (1400) is transferred from the lower and upper release films (LSF, USF), precise thickness control of the protective layer (1400) becomes possible.

[0132] Meanwhile, although not shown in FIG. 3, a step of forming an adhesive layer (1200) on the upper and lower surfaces of the collector may be further included before the step (S120) of supplying the mixed powder to the upper portion of the collector, which proceeds from the second supply roller to the second winding roller, above the lower release film.

[0133] As an example, the adhesive layer (1200) may be a mixture of a polymer resin and a conductor or a conductive polymer resin.

[0134] As an example, the polymer resin may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

[0135] As an example, the step (S130) of pressing the upper portion of the upper release film from the third supply roller to the third take-up roller on the upper portion of the collector (1100) may be performed by a fusion machine.

[0136] This manufacturing method will be described in more detail in the description of FIG. 5.

[0137]

[0138] FIG. 4 is a flowchart illustrating a method for manufacturing a mixed powder of one embodiment illustrated in FIG. 3.

[0139] Referring to Fig. 4, in order to manufacture the mixed powder, first, a binder, active material particles, and an organic solvent are mixed (step S210). At this time, a conductive material may be further mixed. In this way, when the binder, active material particles, conductive material, and organic solvent are mixed, the organic solvent dissolves the binder, so that the active material particles and conductive material enter the melted binder. As the binder, a thermosetting resin or a thermoplastic resin, etc. may be used. For example, epoxy, PVDF, elastomer, SBR, CMC, TPE, TPU, etc. may be used. As the organic solvent, toluene, ME, DMF, etc. may be used.

[0140] Afterwards, the organic solvent is removed by drying to form binder-coated active material particles (step S220).

[0141] Thereafter, the binder-coated active material particles and the non-binder-coated active material particles are mixed at a certain ratio (step S230). In one embodiment, the binder-coated active material particles and the non-binder-coated active material particles may be mixed at a ratio of 1:1. In this way, the binder coated on the active material particles can be combined with other active material particles in a subsequent process.

[0142]

[0143] Figure 5 is a schematic diagram illustrating a device for manufacturing a negative electrode material for a secondary battery according to an exemplary embodiment of the present invention.

[0144] Referring to FIGS. 1 to 5, an electrode material manufacturing apparatus for a secondary battery according to an exemplary embodiment of the present invention includes a first supply roller (PR1) and a first take-up roller (WR1), a second supply roller (PR2) and a second take-up roller (WR2), and a third supply roller (PR3) and a third take-up roller (WR3). As an example, the electrode material manufacturing apparatus for a secondary battery may further include a first hopper (H1) and a second hopper (H2). In addition, the electrode material manufacturing apparatus for a secondary battery may further include a fusing device disposed between the third supply roller (PR3) and the third take-up roller (WR3). In addition, the electrode material manufacturing apparatus for a secondary battery may further include a coating unit including a first spray (SP1) and a second spray (SP2). In addition, the device for manufacturing a negative electrode material for a secondary battery may further include a first scraper (SC1) and a second scraper (SC2). In addition, the device for manufacturing a negative electrode material for a secondary battery may further include a roll press (PPR, PLR).

[0145] The first supply roller (PR1) and the first take-up roller (WR1) advance the lower release film (LSF). More specifically, as the first take-up roller (WR1) rotates and takes up the lower release film (LSF), the first supply roller (PR1) is unwound and the lower release film (LSF) advances. Meanwhile, multiple rollers may be arranged for changing direction.

[0146] At this time, the lower release film (LSF) may have a protective layer (1400) attached to it as described above. At this time, the protective layer (1400) faces the upper surface.

[0147] The second supply roller (PR2) and the second winding roller (WR2) are arranged above the first supply roller (PR1) and the first winding roller (WR1) and advance the current collector (1100). More specifically, as the second winding roller (WR2) rotates and winds the current collector (1100), the second supply roller (PR2) is released and the current collector (1100) advances. Meanwhile, multiple rollers may be arranged to change direction.

[0148] The third supply roller (PR3) and the third take-up roller (WR3) are arranged above the first supply roller (PR1) and the first take-up roller (WR1) and advance the upper release film (USF). More specifically, as the third take-up roller (WR3) rotates and winds the upper release film (USF), the third supply roller (PR3) is unwound and the upper release film (USF) advances. Meanwhile, multiple rollers may be arranged for changing direction.

[0149] At this time, the upper release film (USF) may have a protective layer (1400) attached to it as described above. At this time, the protective layer (1400) faces the lower surface.

[0150] As an example, the first supply roller (PR1) is arranged in front of the second supply roller (PR2), and the second supply roller (PR2) is arranged in front of the third supply roller (PR3). Accordingly, a certain gap is formed between the first to third supply rollers (PR1, PR2, PR3), and at this location, the first hopper (H1) and the second hopper (H2) are arranged.

[0151] In more detail, the first hopper (H1) is disposed between the first supply roller (PR1) and the second supply roller (PR2) to supply a mixed powder containing active material particles, conductive particles, and binder powder to the upper portion of the lower release film (LSF). The second hopper (H2) is disposed between the second supply roller (PR2) and the third supply roller (PR3) to supply a mixed powder containing active material particles, conductive particles, and binder powder to the upper portion of the current collector (1100).

[0152] Meanwhile, the third winding roller (WR3) can be placed in front of the second winding roller (WR2).

[0153] The above-described application unit is disposed below the second supply roller (PR2) and applies adhesive to the lower and upper surfaces of the current collector (1100). For example, the application unit may include a first spray (SP1) that sprays adhesive to the lower surface of the current collector (1100) and a second spray (SP2) that sprays adhesive to the upper surface of the current collector (1100). In the present embodiment, the application unit sprays adhesive in a spray type, but the adhesive may be applied to the upper and lower surfaces of the current collector (1100) in another way. For example, the adhesive may be applied to the surface of the current collector (1100) by passing the current collector (1100) through a bowl-shaped container that stores adhesive.

[0154] In addition, the first scraper (SC1) and the second scraper (SC2) are respectively positioned below the first spray (SP1) and the second spray (SP2) to scrape the adhesive so that the applied adhesive has a certain thickness.

[0155] The above pair of roll presses (PPR, PLR) are arranged at least on one of the front and rear ends of the fusion device, and can pressurize the lower surface of the lower release film and the upper surface of the upper release film. For example, the front roll press (PPR) is arranged at the front end of the fusion device (UP, LP) to preliminarily pressurize the lower release film and the upper release film, and the rear roll press (PLR) is arranged at the rear end of the fusion device (UP, LP) to perform flattening, thereby preventing thickness deviation.

[0156] At this time, the pair of roll presses (PPR, PLR) can pressurize at a temperature of 60°C to 150°C.

[0157] The above-described fusion device may include a lower pressure press (LP) that applies pressure from the bottom to the top, and an upper pressure press (UP) that applies pressure from the top to the bottom. By the operation of the fusion device, the protective layer (1400) of the lower release film (LSF) and the protective layer (1400) of the upper release film (USF) are respectively attached to the surface of the active material layer (1300) attached to the adhesive layer (1200) of the current collector (1100), and the lower release film (LSF) and the upper release film (USF) from which the protective layer (1400) has been detached are respectively wound around the first winding roller (WR1) and the third winding roller (WR3).

[0158] As an example, the lower and upper presses (LP, UP) may move a certain distance in a pressurized state in the direction of travel, then release the pressurization and return to their original positions, thereby allowing pressurization to proceed. This operation will be described in more detail with reference to FIGS. 6 to 8.

[0159]

[0160] Figures 6 to 8 are conceptual diagrams illustrating the operation of the lower pressure press and the upper pressure press illustrated in Figure 5.

[0161] As shown in Fig. 6, the lower pressure roller (LP) and the upper pressure roller (UP) are pressed at position A and move in the direction of travel, and when position B is reached as shown in Fig. 7, the lower pressure roller (LP) and the upper pressure roller (UP) release the pressure and return to the original position as shown in Fig. 8.

[0162] In this way, when the lower and upper presses are configured to move under pressure, the efficiency of the manufacturing process can be improved. In other words, when the fusion machine only performs a pressing operation at a fixed position, the first winding roller (WR1) and the third winding roller (WR3) must perform a repetitive operation of stopping and starting the operation. Therefore, the manufacturing speed decreases. Otherwise, when the operation is performed continuously, material that is not pressed in some areas may be wasted.

[0163]

[0164] Figures 9 and 10 are conceptual diagrams showing the first and second pressing positions by the lower pressing press and the upper pressing press shown in Figures 6 to 8.

[0165] The first and second pressing positions (PP1, PP2) by the lower pressing press and the upper pressing press can be adjacent to each other as in Fig. 9, or can overlap to a certain extent as in Fig. 10. That is, after pressing is performed at the first pressing position (PP1) through the operations of Figs. 6 to 8, the second pressing position (PR2) where pressing is performed again after returning to the original position is controlled so that the operating speeds of the first to third winding rollers (WR1, WR2, WR3) and the lower and upper pressing presses (LP, UP) are adjacent to each other or overlap each other. In this case, loss of material can be prevented.

[0166]

[0167] Referring again to FIG. 5, instead of the lower pressure press and upper pressure press (LP. UP) applied by the above-described fusion device, an ultrasonic fusion device may be applied. When strong press pressure is applied by the lower pressure press and upper pressure press (LP. UP), an active material with weak durability may be pressed, as shown in FIG. 14.

[0168] To address these issues, when an ultrasonic bonding machine is used, the bonding material can be melted and bonded through frictional heat generated by ultrasonic vibrations, even without applying strong press pressure. Consequently, damage to the active material can be prevented.

[0169]

[0170] Fig. 11 is a schematic diagram illustrating an apparatus for manufacturing a negative electrode material for a secondary battery according to another exemplary embodiment of the present invention. In the embodiment of Fig. 5 above, a protective layer is attached to the surfaces of the lower release film (LSF) and the upper release film (USF), but in this embodiment, the protective layer is not attached to the lower release film (LSF) and the upper release film (USF). For this purpose, a separate configuration for transferring the protective layer may be added. The same components as in the previous embodiment are given the same reference numerals, and redundant descriptions are omitted.

[0171] Referring to FIG. 11, an electrode material manufacturing device for a secondary battery according to another exemplary embodiment of the present invention may further include a fourth supply roller (PR4), a fourth winding roller (WR4), a fifth supply roller (PR5), and a fifth winding roller (WR5).

[0172] The fourth supply roller (PR4) and the fourth take-up roller (WR4) are arranged at the rear end of the first take-up roller (WR1) and below the collector to advance the lower transfer release film.

[0173] The fifth supply roller (PR5) and the fifth take-up roller (WR5) are arranged on the upper side of the collector at the rear end of the second take-up roller (WR2) to advance the upper transfer release film. At this time, a protective layer may be formed on the surfaces of the lower transfer release film and the upper transfer release film, and a pair of roll presses (LLR) arranged at the rear ends of the fourth supply roller (PR4) and the fifth supply roller (PR5) may be further included. This pair of roll presses (LLR) can further solidify the attachment of the protective layer.

[0174]

[0175] Fig. 12 is a schematic diagram illustrating a secondary battery negative electrode material manufacturing apparatus according to another exemplary embodiment of the present invention, and Fig. 13 is a schematic diagram illustrating a secondary battery negative electrode material manufacturing apparatus according to another exemplary embodiment of the present invention. The secondary battery negative electrode material manufacturing apparatus illustrated in Figs. 12 and 13 is a manufacturing apparatus for manufacturing the secondary battery negative electrode material illustrated in Fig. 2, and is substantially the same as the manufacturing apparatus illustrated in Figs. 5 and 11 for manufacturing the secondary battery negative electrode material illustrated in Fig. 1, except for the hopper. Therefore, identical or similar components are given the same reference numerals, and redundant descriptions are omitted.

[0176] Referring to FIGS. 12 and 13, the electrode material manufacturing device for a secondary battery includes a pair of first hoppers (H1), a pair of second hoppers (H2), and a pair of third hoppers (H3).

[0177] The above pair of first hoppers (H1) are arranged between the first supply roller (PR1) and the second supply roller (PR2) to supply mixed powder to the upper portion of the lower release film (LSF).

[0178] The above pair of second hoppers (H2) are arranged between the second supply roller (PR2) and the third supply roller (PR3) to supply mixed powder to the upper portion of the collector (1100).

[0179] The third hopper (H) is positioned between at least one of the pair of first hoppers and the pair of second hoppers to supply binder powder. When configured in this manner, an electrode material for a secondary battery having an active layer composed of three layers can be manufactured, as shown in Fig. 2.

[0180]

[0181] In this way, according to the electrode material for a secondary battery, the manufacturing method thereof, and the manufacturing apparatus thereof according to the present invention, the protective layer covers the active material layer, and thus the detachment of the active material layer can be prevented.

[0182] Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims to be described later.

Claims

1. A collector having an upper surface and a lower surface; Active material layers attached to the upper and lower surfaces of the collector, respectively, through adhesive layers; and A protective layer attached to each of the upper and lower surfaces of the active material layer; Electrode material for secondary batteries including:

2. In paragraph 1, An electrode material for a secondary battery, characterized in that the active material layer comprises active material particles and a binder.

3. In paragraph 1, The above active material layer is composed of three layers, An electrode material for a secondary battery, characterized in that the first and third layers include active material particles and a binder, and the second layer in the middle includes only a binder.

4. In paragraph 3, An electrode material for a secondary battery, characterized in that the porosity of the second layer constituting the active material layer is in the range of 30% to 50%.

5. In paragraph 3, An electrode material for a secondary battery, characterized in that the binder of the second layer constituting the above-mentioned active material layer has a pre-bonded structure.

6. In paragraph 4, An electrode material for a secondary battery, characterized in that the binder of the second layer constituting the active material layer includes PVDF (Polyvinylidene fluoride).

7. In paragraph 2 or 3, The above active material particles are, An electrode material for a secondary battery, characterized in that it is a negative electrode active material particle containing at least one of carbon, silicon, tin, antimony, and graphene.

8. In paragraph 7, An electrode material for a secondary battery, characterized in that the above-mentioned collector is made of copper foil (Cu).

9. In paragraph 2 or paragraph 3, The above active material particles are, An electrode material for a secondary battery characterized by being a cathode active material particle composed of aluminum (Al), nickel (Ni), titanium (Ti), tungsten (W), iron (Fe), chromium (Cr), manganese (Mn), an alloy thereof, and a combination thereof.

10. In paragraph 9, An electrode material for a secondary battery, characterized in that the above-mentioned collector is made of aluminum foil (Al).

11. In paragraph 2, The above binder, An electrode material for a secondary battery, characterized in that it contains at least one of PVDF (polyvinylidene fluoride), elastomer, SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), NBR (nitrile butadiene rubber), butathione, PAA (polyacrylic acid), PP (polypropylene), and PE (polyethylene).

12. In paragraph 2 or paragraph 3, An electrode material for a secondary battery, characterized in that the active material layer further includes conductive particles dispersed within the binder.

13. In paragraph 12, An electrode material for a secondary battery, characterized in that the conductive particles include at least one of carbon black, acetylene black, VGCF (Vapor grown carbon fiber), CNT, and graphene.

14. In paragraph 1, An electrode material for a secondary battery, characterized in that the adhesive layer is a polymer resin mixed with a conductor.

15. In paragraph 14, The above polymer resin is, An electrode material for a secondary battery, characterized in that it contains any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

16. In paragraph 15, An electrode material for a secondary battery, characterized in that the protective layer comprises the same material as the adhesive layer.

17. In paragraph 1, An electrode material for a secondary battery, characterized in that the thickness of the protective layer is 1㎛ to 10㎛.

18. A step of supplying mixed powder to the upper portion of the lower release film that proceeds from the first supply roller to the first take-up roller; A step of supplying mixed powder to the upper part of the current collector, which proceeds from the second supply roller to the second winding roller, on the upper part of the lower release film; and A step of pressing the upper part of the upper release film that advances from the third supply roller to the third take-up roller at the upper part of the entire body; A method for manufacturing an electrode material for a secondary battery, comprising:

19. In paragraph 18, A method for manufacturing an electrode material for a secondary battery, wherein the above mixed powder is characterized by a mixture of active material particles and binder particles.

20. In paragraph 18, The above mixed powder is, A step of mixing a binder, active material particles and an organic solvent; A step of drying to remove the organic solvent, thereby forming binder-coated active material particles; and A step of mixing the binder-coated active material particles and the binder-free active material particles at a certain ratio; A method for manufacturing an electrode material for a secondary battery, characterized in that it is manufactured through .

21. In paragraph 20, A method for manufacturing an electrode material for a secondary battery, characterized in that, in the step of mixing the binder-coated active material particles and the binder-uncoated active material particles at a certain ratio, the binder-coated active material particles and the binder-uncoated active material particles are mixed at a ratio of 1:

1.

22. In paragraph 20, In the step of mixing the binder, active material particles and organic solvent, A method for manufacturing an electrode material for a secondary battery, characterized by further mixing a conductive material.

23. In paragraph 18, In the step of supplying mixed powder to the upper part of the lower release film proceeding from the first supply roller to the first take-up roller, and in the step of supplying mixed powder to the upper part of the current collector proceeding from the second supply roller to the second take-up roller, from the upper part of the lower release film, A method for manufacturing an electrode material for a secondary battery, characterized in that the above mixed powder is supplied so that a first layer in which a binder and an active material are mixed, a second layer composed only of an active material, and a third layer in which a binder and an active material are mixed are laminated.

24. In paragraph 19 or 20, The above active material particles are, A method for manufacturing an electrode material for a secondary battery, characterized in that the electrode material is a particle of an anode active material containing at least one of carbon, silicon, tin, antimony, and graphene.

25. In paragraph 24, A method for manufacturing an electrode material for a secondary battery, characterized in that the above-mentioned collector is copper foil (Cu).

26. In paragraph 19 or 20, The above active material particles are, A method for manufacturing an electrode material for a secondary battery, characterized in that the electrode material is a positive electrode active material particle composed of aluminum (Al), nickel (Ni), titanium (Ti), tungsten (W), iron (Fe), chromium (Cr), manganese (Mn), an alloy thereof, and a combination thereof.

27. In paragraph 26, A method for manufacturing an electrode material for a secondary battery, characterized in that the above-mentioned collector is made of aluminum foil (Al).

28. In paragraph 18, A method for manufacturing an electrode material for a secondary battery, characterized in that a protective layer is attached to the upper surface of the lower release film and the lower surface of the upper release film.

29. In paragraph 28, A method for manufacturing an electrode material for a secondary battery, characterized in that the protective layer includes a polymer resin including SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), PE (polyethylene) and a conductor.

30. In paragraph 28, A method for manufacturing an electrode material for a secondary battery, characterized in that the thickness of the protective layer is 1 ㎛ to 10 ㎛.

31. In paragraph 30, A method for manufacturing an electrode material for a secondary battery, characterized in that the thickness of the lower and upper release films is 2 to 4 times the thickness of the protective layer.

32. In paragraph 18, Before the step of supplying the mixed powder to the upper part of the current collector from the second supply roller to the second winding roller on the upper part of the lower release film, A method for manufacturing an electrode material for a secondary battery, characterized in that it further includes a step of forming an adhesive layer on the upper and lower surfaces of the above-mentioned collector.

33. In paragraph 32, A method for manufacturing an electrode material for a secondary battery, characterized in that the adhesive layer is a polymer resin mixed with a conductor.

34. In paragraph 33, The above polymer resin is, A method for manufacturing an electrode material for a secondary battery, characterized in that it comprises any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), and PE (polyethylene).

35. In paragraph 18, A method for manufacturing an electrode material for a secondary battery, characterized in that the step of pressing the upper part of the upper release film, which proceeds from the third supply roller to the third winding roller on the upper part of the current collector, is performed by a fusion machine.

36. In paragraph 35, A method for manufacturing an electrode material for a secondary battery, characterized in that the above-mentioned fusion machine is an ultrasonic fusion machine.

37. In paragraph 35, A method for manufacturing an electrode material for a secondary battery, characterized in that the above-mentioned fusion device includes a lower pressure press and an upper pressure press respectively disposed below and above the current collector.

38. In paragraph 37, A method for manufacturing an electrode material for a secondary battery, characterized in that the lower and upper presses move a certain distance in a pressurized state in the direction of movement, release the pressurization, and return to the original position so that pressurization can proceed.

39. In paragraph 38, A method for manufacturing an electrode material for a secondary battery, characterized in that the first pressurizing position and the second pressurizing position are adjacent or overlap to a certain extent.

40. In paragraph 18, A step of transferring the protective layers attached to the upper and lower surfaces, respectively, of the lower and upper transfer release films, which are arranged at the rear end of the first to third winding rollers and which proceed from the fourth and fifth supply rollers, which are arranged at the lower and upper sides, respectively, of the current collector to the fourth and sixth winding rollers, respectively, to the lower and upper surfaces, respectively, of the active layer formed on the lower and upper surfaces, respectively, of the current collector; A method for manufacturing an electrode material for a secondary battery, characterized in that it further includes:

41. In paragraph 40, A method for manufacturing an electrode material for a secondary battery, characterized in that the protective layer includes a polymer resin including SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, butadiene rubber, silane-based binder, urethane, PP (polypropylene), PE (polyethylene) and a conductor.

42. In paragraph 41, A method for manufacturing an electrode material for a secondary battery, characterized in that the thickness of the protective layer is 1 ㎛ to 10 ㎛.

43. In paragraph 42, A method for manufacturing an electrode material for a secondary battery, characterized in that the thickness of the lower and upper release films is 2 to 4 times the thickness of the protective layer.

44. A first supply roller and a first take-up roller for advancing the lower release film; A second supply roller and a second winding roller are arranged above the first supply roller and the first winding roller and are used to advance the collector; and A third supply roller and a third winding roller are arranged above the first supply roller and the first winding roller, and are used to advance the upper release film; A device for manufacturing electrode materials for secondary batteries, including:

45. In paragraph 44, The above first supply roller is arranged in front of the second supply roller, The second supply roller is arranged in front of the third supply roller, A secondary battery electrode material manufacturing device characterized in that the third winding roller is arranged in front of the second winding roller.

46. ​​In paragraph 45, A fusion device arranged between the third supply roller and the third winding roller; A secondary battery electrode material manufacturing device characterized by further including:

47. In paragraph 46, The above fusion machine, A secondary battery electrode material manufacturing device characterized by being an ultrasonic fusion device.

48. In paragraph 46, The above fusion machine, A lower pressure press that presses from the bottom to the top; and Upper pressure press that applies pressure from top to bottom; A secondary battery electrode material manufacturing device characterized by including:

49. In paragraph 48, A secondary battery electrode material manufacturing device characterized in that the lower and upper presses move a certain distance in a pressurized state in the direction of movement, release the pressurization, and return to the original position so that pressurization can proceed.

50. In paragraph 46, A pair of roll presses arranged at least on one of the front and rear ends of the above-mentioned fusion machine to press the lower surface of the lower release film and the upper surface of the upper release film; A secondary battery electrode material manufacturing device characterized by further including:

51. In paragraph 50, The above roll press is a secondary battery electrode material manufacturing device characterized in that it presses at a temperature of 60°C to 150°C.

52. In paragraph 45, A first hopper arranged between the first supply roller and the second supply roller to supply mixed powder to the upper portion of the lower release film; and A second hopper arranged between the second supply roller and the third supply roller to supply mixed powder to the upper portion of the collector; A secondary battery electrode material manufacturing device characterized by further including:

53. In paragraph 45, A pair of first hoppers arranged between the first supply roller and the second supply roller to supply mixed powder to the upper portion of the lower release film; A pair of second hoppers arranged between the second supply roller and the third supply roller to supply mixed powder to the upper portion of the collector; and A third hopper, arranged between at least one of the pair of first hoppers and the pair of second hoppers, for supplying binder powder; A secondary battery electrode material manufacturing device characterized by further including:

54. In paragraph 44, An application unit disposed below the second supply roller and applying adhesive to the lower and upper surfaces of the collector; A secondary battery electrode material manufacturing device characterized by further including:

55. In paragraph 54, The above application part, A first spray that sprays adhesive onto the lower surface of the entire body; and A second spray that sprays adhesive onto the upper surface of the entire body; A secondary battery electrode material manufacturing device characterized by including:

56. In paragraph 54, A first scraper and a second scraper each scrape the adhesive applied to the lower and upper surfaces of the contact member to a constant thickness; A secondary battery electrode material manufacturing device characterized by further including:

57. In paragraph 45, At the rear end of the first winding roller, a fourth supply roller and a fourth winding roller are arranged at the lower part of the collector to advance the lower transfer release film; and At the rear end of the second winding roller, a fifth supply roller and a fifth winding roller are arranged on the upper side of the collector to advance the upper transfer release film; A secondary battery electrode material manufacturing device characterized by further including:

58. In paragraph 45, A secondary battery electrode material manufacturing device further comprising a pair of roll presses arranged at the rear end of the fourth supply roller and the fifth supply roller.

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