Method for manufacturing electrode material for secondary battery

Abstract

Disclosed is a method for manufacturing an electrode material for a secondary battery, which eliminates the use of solvents for dissolving binders, thus being harmless to the human body and reducing losses in the slurry process. The method for manufacturing an electrode material for a secondary battery includes the steps of: pulverizing a raw material; applying the raw material on the upper part of a first release film; arranging a second release film on the upper part of the raw material; performing heating and pressing to produce an active material sheet; removing either the first release film or the second release film; applying a polymer adhesive to the exposed surface of the active material sheet from which the first release film or the second release film has been removed; and attaching a current collector to the upper surface of the polymer adhesive.

Description

Secondary battery electrode material manufacturing method

[0001] The present invention relates to a method for manufacturing an electrode material, and more specifically, to a method for manufacturing an electrode material such as a positive electrode material or negative electrode material of a secondary battery.

[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 such a positive electrode material or negative electrode material, first, a positive electrode material or negative electrode active material, a conductive agent, a binder, and a solvent are mixed to form a slurry, the binder is dissolved by the solvent, and then the solvent is dried again, thereby completing a positive electrode material or negative electrode material in which the positive electrode material or negative electrode active material and the conductive agent are bound by the binder.

[0006] At this time, for example, binders such as PVDF (Polyvinylidene fluoride) and PTFE (Polytetrafluoroethylene) and solvents such as NMP (N-Methyl-2-Pyrrolidone) are used, but solvents such as NMP are harmful to the human body, are not environmentally friendly, and also have the problem of causing a loss of 10 to 15% in the slurry process.

[0007] [Prior Art Literature]

[0008] [Patent Document]

[0009] (Patent Document 1) Republic of Korea Publication No. 10-2022-0167669

[0010] Accordingly, the problem that the present invention seeks to solve is to provide a method for manufacturing a secondary battery electrode material without using a solvent.

[0011] A method for manufacturing a secondary battery electrode material according to an exemplary embodiment of the present invention for solving such a problem includes the steps of: crushing a raw material; applying the raw material on top of a first release film; arranging a second release film on top of the raw material; performing heating and pressing to manufacture an active material sheet; removing the first release film or the second release film; applying a polymer adhesive to the surface of the active material sheet exposed by removing the first release film or the second release film; and attaching a current collector plate to the upper surface of the polymer adhesive.

[0012] As an example, the step of crushing the raw material particles may include a step of crushing an active material to form an active material powder, a step of crushing a binder to form a binder powder, and a step of mixing the active material powder and the binder powder.

[0013] As an example, the particle size of the active material powder may be larger than the particle size of the binder powder.

[0014] As an example, the particle size of the active material powder may be in the range of 5 μm to 20 μm, and the particle size of the binder powder may be in the range of 100 nm to 900 nm.

[0015] As an example, the active material may include at least one of graphite, silicon, and tin.

[0016] As an example, the binder may include at least one of PVDF (Polyvinylidene fluoride), PTFE (Polytetrafluoroethylene), elastomer, and silicone rubber.

[0017] As an example, the step of pulverizing the active material to form active material powder can be performed through a ball mill or jet mill process.

[0018] As an example, the step of crushing the binder to form binder powder can be performed by freeze-crushing the fluorine-based membrane film.

[0019] As an example, the step of applying a raw material on the upper part of the first release film can be performed by feeding the active material powder, the binder powder, and water into an extruder and discharging them from the extruder onto the first release film.

[0020] As an example, in the step of mixing the active material powder and the binder powder, a conductive material powder may be further mixed.

[0021] As an example, the conductive powder may include at least one of carbon black, acetylene black, VGCF (Vapor grown carbon fiber), CNT, and graphene.

[0022] As an example, the step of manufacturing an active material sheet by performing heating and pressing may include the step of performing a first roll press and the step of performing a flat plate press.

[0023] As an example, the step of manufacturing an active material sheet by performing heating and pressing may further include a step of performing a second roll press after performing the flat press.

[0024] As an example, at least one of the rollers of the secondary roll press may be a roller formed of a flexible material.

[0025] As an example, the method may further include a step of modifying the exposed surface of the active material sheet before the step of applying a polymer adhesive to the exposed surface of the active material sheet by removing the first release film or the second release film.

[0026] As an example, the step of modifying the surface of the exposed active material sheet may include a step of spraying a sodium-based liquid onto the surface of the exposed active material sheet, a step of washing the sodium-based liquid, and a step of drying.

[0027] As an example, the sodium series liquid may be any one of a sodium ammonia solution and a sodium naphthalene solution.

[0028] As an example, the step of washing the sodium series liquid may be performed using water.

[0029] As an example, in the step of applying a polymer adhesive to the surface of the active material sheet exposed by removing the first release film or the second release film, the polymer adhesive may be a mixture of a polymer resin and a conductor or a conductive polymer resin.

[0030] As an example, the polymer resin may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, and butadiene rubber.

[0031] As an example, in the step of attaching a current collector to the upper surface of the polymer adhesive, the current collector may be copper foil or aluminum foil.

[0032] As an example, if the collector plate is made of copper, the collector plate may be surface-treated to be black.

[0033] As an example, after the step of attaching the current collector to the upper surface of the polymer adhesive, roll pressing may be further performed.

[0034] In this way, according to the method for manufacturing a secondary battery electrode material according to the present invention, a solvent for dissolving a binder is not used, so it is harmless to the human body and the loss of the slurry process can be eliminated.

[0035] FIG. 1 is a flowchart illustrating a method for manufacturing a secondary battery electrode material according to an exemplary embodiment of the present invention.

[0036] Figure 2 is a flowchart illustrating detailed steps of step S110 illustrated in Figure 1.

[0037] Figure 3 is a flowchart illustrating detailed steps of step S140 illustrated in Figure 1.

[0038] Figure 4 is a flowchart illustrating detailed steps of step S160 illustrated in Figure 1.

[0039] Figure 5 is a conceptual diagram illustrating a state in which the active material powder and the binder powder are mixed in step S113 of Figure 2.

[0040] Fig. 6 is a conceptual diagram illustrating a state in which active material powder and binder powder are mixed, and is a conceptual diagram for comparison with Fig. 5.

[0041] Fig. 7 is a side view showing a state in which step S120 illustrated in Fig. 1 has been performed.

[0042] FIG. 8 is a schematic diagram illustrating an extruder used in step S120 illustrated in FIG. 1.

[0043] Fig. 9 is a side view showing a state in which step S130 illustrated in Fig. 1 has been performed.

[0044] Fig. 10 is a side view showing a state in which step S141 illustrated in Fig. 3 has been performed.

[0045] Fig. 11 is a side view showing a state in which step S142 illustrated in Fig. 3 has been performed.

[0046] Fig. 12 is a side view illustrating the state of step S150 illustrated in Fig. 1.

[0047] Fig. 13 is a side view illustrating the state of step S161 illustrated in Fig. 4.

[0048] Fig. 14 is a side view showing a state in which step S170 illustrated in Fig. 1 has been performed.

[0049] Fig. 15 is a side view showing a state in which step S180 illustrated in Fig. 1 has been performed.

[0050] Fig. 16 is a side view illustrating the state of step S190 illustrated in Fig. 1.

[0051] 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.

[0052] 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."

[0053] 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.

[0054] 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.

[0055] Additionally, the configurations individually described in each embodiment may also be applied in other embodiments.

[0056] Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

[0057] FIG. 1 is a flowchart illustrating a method for manufacturing a secondary battery electrode material according to an exemplary embodiment of the present invention.

[0058] Referring to Fig. 1, according to a method for manufacturing a secondary battery electrode material according to an exemplary embodiment of the present invention, first, raw materials are pulverized (step S110). The raw materials are a positive electrode active material or a negative electrode active material of a secondary battery and a binder for binding them, and these are pulverized to manufacture a powder. For example, the active material may include at least one of graphite, silicon, and tin, and the binder may include at least one of PVDF (Polyvinylidene fluoride), PTFE (Polytetrafluoroethylene), an elastomer, and silicone rubber.

[0059] Figure 2 is a flowchart illustrating detailed steps of step S110 illustrated in Figure 1.

[0060] Referring to FIG. 2, the step S110 of crushing a raw material may include a step (S111) of crushing an active material to form active material powder, a step (S112) of crushing a binder to form binder powder, and a step (S113) of mixing the active material powder and the binder powder. Meanwhile, in the step (S113) of mixing the active material powder and the binder powder, a conductive material powder may be further mixed. As an example, the conductive material powder may include at least one of carbon black, acetylene black, VGCF (Vapor grown carbon fiber), CNT, and graphene.

[0061] Meanwhile, for convenience, the step of forming active material powder (S111) is described before the step of forming binder powder by crushing the binder (S112). However, conversely, the step of forming active material powder (S111) may be performed after the step of forming binder powder by crushing the binder (S112), and these two steps may be performed simultaneously.

[0062] For example, the step of forming active material powder by crushing the active material (step S111) can be performed through a ball mill or jet mill process, and the step of forming binder powder by crushing the binder (step S112) can be performed by freeze-pulverizing the fluorine-based membrane film.

[0063] The reason for freeze-pulverizing the binder is that the Teflon-based polymers that form the binder, such as PTFE or PVDF, are soft and difficult to pulverize using conventional crushing methods. Therefore, for example, liquid nitrogen (-196 degrees Celsius) is used to create an ultra-low temperature environment, and the fluorine-based membrane film is frozen before crushing. Alternatively, the fluorine-based membrane film can be pre-pulverized before freeze-pulverizing.

[0064] Experimental results show that binder powder is difficult to grind to a particle size of 1 μm or less even when freeze-milled. This is due to the low coefficient of friction of fluorine-based materials.

[0065] At this time, the particle size of the active material powder is pulverized to be larger than the particle size of the binder powder. For example, the particle size of the active material powder may be in the range of 5 μm to 20 μm, and the particle size of the binder powder may be in the range of 100 nm to 900 nm. The reason for making the particle sizes of the active material powder and the binder powder different in this way will be explained with reference to FIGS. 5 and 6, which will be described later.

[0066] FIG. 5 is a conceptual diagram illustrating a state in which active material powder and binder powder are mixed in step S113 of FIG. 2, and FIG. 6 is a conceptual diagram illustrating a state in which active material powder and binder powder are mixed, and is a conceptual diagram for comparison with FIG. 5.

[0067] Referring to FIGS. 5 and 6, the particles constituting the raw material (100) are active material particles (110) and binder particles (120). FIG. 5 illustrates a case in which the particle size of the active material particles (110) is larger than that of the binder particles (120), as in the present invention, and FIG. 6 illustrates a comparative example in which the particle size of the active material particles (110) is similar to that of the binder particles (120).

[0068] As shown in Fig. 5, when the particle size of the binder particles (120) is small, the bonding area between the active material particles (110) and the binder particles (120) increases, thereby increasing the bonding force between the active material particles (110) and the binder particles (120). In addition, the density of the active material particles (110) per unit volume increases, thereby improving the performance of the electrode material.

[0069] Referring again to Figure 1, after crushing the raw material (step S110), the raw material is applied to the upper part of the first release film (step S120).

[0070] Fig. 7 is a side view showing a state in which step S120 illustrated in Fig. 1 has been performed.

[0071] Referring to Fig. 7, a raw material (100) is applied to the upper portion of the first heteromorphic film (SF1).

[0072] The first type of film (SF1) is wound on a roll and is unwound along the working direction (PD), so that the raw material (100) can be continuously applied thereon.

[0073] When applying the raw material (100) on the upper part of the first release film (SF1), the raw material mixed with active material particles and binder particles can be placed in a powder state on the upper part of the first release film (SF1) to an appropriate thickness, but an extruder can also be used.

[0074] FIG. 8 is a schematic diagram illustrating an extruder used in step S120 illustrated in FIG. 1.

[0075] Referring to FIGS. 7 and 8, the step (S120) of applying a raw material to the upper portion of the first release film is as follows: when the active material powder, the binder powder, and optionally water are fed into the hopper (IMI) of the extruder, they are mixed more evenly by the rotating conveying screw (TS), are conveyed toward the discharge port (IMO), and are applied to the upper portion of the first release film (SF1) through the discharge port (IMO). At this time, depending on the size, a plurality of extruders may be arranged in parallel to discharge the raw material to the upper portion of the first release film (SF1).

[0076] Referring again to Figure 1, after applying the raw material on top of the first release film (step S120), the second release film is placed on top of the raw material (step S130).

[0077] Fig. 9 is a side view showing a state in which step S130 illustrated in Fig. 1 has been performed.

[0078] Referring to Fig. 9, a second release film (SF2) is wound onto a roll and placed continuously on top of the raw material (100) applied on top of the first release film (SF1). In the present invention, in order to improve productivity, all processes are carried out while being transported along the work direction (PD), but they may also be carried out while being fixed to a work table.

[0079] Referring back to Figure 1, after placing a second release film on top of the raw material (step S130), heating and pressing are performed to manufacture an active material sheet (step S140). For example, by pressing while applying heat to the top of the second release film, the binder can be melted, thereby bonding the binder and the active material.

[0080] Figure 3 is a flowchart illustrating detailed steps of step S140 illustrated in Figure 1.

[0081] Referring to FIGS. 1 and 3, the step (S140) of manufacturing an active material sheet by performing heating and pressing may include a step (S141) of performing a first roll press and a step (S142) of performing a flat press.

[0082] Fig. 10 is a side view showing a state in which step S141 illustrated in Fig. 3 has been performed.

[0083] Referring to FIG. 10, the raw material (100) between the first release film (SF1) and the second release film (SF2) passes between a pair of rollers (R), and is subjected to pressure and temperature, so that the binder binds the active material and is manufactured into an active material sheet (200).

[0084] Fig. 11 is a side view showing a state in which step S142 illustrated in Fig. 3 has been performed.

[0085] Referring to Fig. 11, after the active material sheet (200) is first manufactured by roll pressing at the front end, a flat press (P) is performed once again. Roll pressing provides high vertical binding force in the thickness direction of the active material sheet (200), but weak horizontal binding force. To compensate for this, the present invention performs a flat press once again. Therefore, the area pressed into the flat plate has increased vertical and horizontal binding force.

[0086] Referring back to FIGS. 1 and 3, the step (S140) of manufacturing an active material sheet by performing heating and pressing may further include a step (S143) of performing a second roll press after performing the flat plate press. In one embodiment, at least one of the rollers of the second roll press may be a roller formed of a flexible material.

[0087] As previously explained with reference to Figure 11, when a flat press is performed, the horizontal and vertical bonding forces within the flat plate increase, but the flat plate presses, i.e., the flat plate pressed boundary area, may be wrinkled or formed differently from other areas, so this problem can be solved when finishing with a roller made of a flexible material.

[0088] Referring again to FIG. 1, after heating and pressing are performed to produce an active material sheet (step S140), the first release film or the second release film is removed (step S150).

[0089] Fig. 12 is a side view illustrating the state of step S150 illustrated in Fig. 1.

[0090] Referring to FIG. 12, the second heteromorphic film (SF2) is separated from the active material sheet (200) as the upper roller (not shown) rotates, thereby exposing the upper surface of the active material sheet (200).

[0091] Referring again to FIG. 1, after removing the first release film or the second release film (step S150), the surface of the selectively exposed active material sheet can be modified (step S160).

[0092] Figure 4 is a flowchart illustrating detailed steps of step S160 illustrated in Figure 1.

[0093] Referring to FIGS. 1 and 4, the step (S160) of modifying the surface of the exposed active material sheet may include a step (S161) of spraying a sodium-based liquid onto the surface of the exposed active material sheet, a step (S162) of washing the sodium-based liquid, and a step (S163) of drying.

[0094] Fig. 13 is a side view illustrating the state of step S161 illustrated in Fig. 4.

[0095] Referring to Fig. 13, a sodium-based liquid (NL) is sprayed onto the upper surface of the exposed active material sheet (200). As an example, the sodium-based liquid may be any one of a sodium ammonia solution and a sodium naphthalene solution. In this way, spraying the sodium-based liquid can modify the surface of a fluoropolymer, including a non-adhesive material such as PTFE, PFA, FEP, ETFE, PCTFE, and PVDF, thereby increasing heterogeneous bonding strength.

[0096] Referring again to FIG. 4, the step of washing the sodium series liquid (S162) can be performed using water, and the drying step (S163) removes the water used in the washing.

[0097] Referring again to FIG. 1, a polymer adhesive is then applied to the exposed active material sheet surface (step S170).

[0098] Fig. 14 is a side view showing a state in which step S170 illustrated in Fig. 1 has been performed.

[0099] Referring to Fig. 14, a polymer adhesive (300) is applied to the upper surface of the exposed active material sheet (200). The polymer adhesive (300) may be a mixture of a polymer resin and a conductor or a conductive polymer resin.

[0100] As an example, the polymer resin may include any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, and butadiene rubber.

[0101] Referring again to FIG. 1, after applying a polymer adhesive to the exposed active material sheet surface (step S170), a current collector is attached to the upper surface of the polymer adhesive (step S180).

[0102] Fig. 15 is a side view showing a state in which step S180 illustrated in Fig. 1 has been performed.

[0103] Referring to Fig. 15, a current collector plate (400) of a secondary battery electrode material is attached to the upper surface of the polymer adhesive (300). The current collector plate (400) may be copper foil or aluminum foil.

[0104] As an example, if the current collector plate is made of copper foil, the current collector plate may be surface-treated with blackening. This blackening surface treatment forms a roughness on the surface of the negative electrode current collector plate using Cu2O or CuO, and through this blackening surface treatment, the negative electrode active material particles can be more firmly attached to the negative electrode current collector plate.

[0105] Referring again to FIG. 1, after attaching the collector plate to the upper surface of the polymer adhesive (step S180), roll pressing can optionally be performed (step S190).

[0106] Fig. 16 is a side view illustrating the state of step S190 illustrated in Fig. 1.

[0107] Referring to Fig. 16, by pressurizing the upper portion of the current collector plate (400), the adhesive strength between the current collector plate (400) and the active material sheet (200) can be strengthened.

[0108] In this way, according to the method for manufacturing a secondary battery electrode material according to the present invention, a solvent for dissolving a binder is not used, so it is harmless to the human body and the loss of the slurry process can be eliminated.

[0109] 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. Step of crushing raw materials; A step of applying raw materials on the upper part of the first heteromorphic film; A step of placing a second release film on top of the raw material; A step of manufacturing an active material sheet by performing heating and pressing; A step of removing the first release film or the second release film; A step of applying a polymer adhesive to the surface of the active material sheet exposed by removing the first release film or the second release film; and A step of attaching a current collector to the upper surface of a polymer adhesive; A method for manufacturing a secondary battery electrode material comprising:

2. In paragraph 1, The step of crushing the above raw material particles is: A step of crushing an active material to form an active material powder; A step of crushing a binder to form binder powder; and A step of mixing the above active material powder and binder powder; A method for manufacturing a secondary battery electrode material, characterized in that it includes:

3. In paragraph 2, A method for manufacturing a secondary battery electrode material, characterized in that the particle size of the active material powder is larger than the particle size of the binder powder.

4. In paragraph 3, The particle size of the above active material powder is in the range of 5㎛ to 20㎛, A method for manufacturing a secondary battery electrode material, characterized in that the particle size of the binder powder is in the range of 100 nm to 900 nm.

5. In paragraph 2, A method for manufacturing a secondary battery electrode material, characterized in that the active material comprises at least one of graphite, silicon, and tin.

6. In paragraph 2, A method for manufacturing a secondary battery electrode material, characterized in that the binder comprises at least one of PVDF (Polyvinylidene fluoride), PTFE (Polytetrafluoroethylene), elastomer, and silicone rubber.

7. In paragraph 2, The step of crushing the active material to form active material powder is: A method for manufacturing a secondary battery electrode material, characterized in that it is performed through a ball mill or jet mill process.

8. In paragraph 2, The step of crushing the binder to form binder powder is A method for manufacturing a secondary battery electrode material, characterized in that the method is performed by freeze-pulverizing a fluorine-based membrane film.

9. In paragraph 2, The step of applying raw materials on the upper part of the first type film is as follows: A method for manufacturing a secondary battery electrode material, characterized in that it is performed through a process of putting the active material powder, the binder powder, and water into an extruder and extruding them from the extruder onto the first release film.

10. In paragraph 2, In the step of mixing the above active material powder and binder powder, A method for manufacturing a secondary battery electrode material, characterized by further mixing a conductive powder.

11. In paragraph 10, A method for manufacturing a secondary battery electrode material, characterized in that the conductive powder comprises at least one of carbon black, acetylene black, VGCF (Vapor grown carbon fiber), CNT, and graphene.

12. In paragraph 1, The step of manufacturing an active material sheet by performing heating and pressing is as follows: Step of performing the first roll press; and Steps to perform a flat press; A method for manufacturing a secondary battery electrode material, characterized in that it includes:

13. In paragraph 12, The step of manufacturing an active material sheet by performing heating and pressing is as follows: After performing the above flat press, Step of performing the second roll press; A method for manufacturing a secondary battery electrode material, characterized in that it further includes.

14. In paragraph 13, A method for manufacturing a secondary battery electrode material, characterized in that at least one of the rollers of the secondary roll press is formed of a flexible material.

15. In paragraph 1, Before the step of applying a polymer adhesive to the exposed surface of the active material sheet by removing the first release film or the second release film, A step of modifying the surface of the exposed active material sheet; A method for manufacturing a secondary battery electrode material, characterized in that it further includes.

16. In paragraph 15, The step of modifying the surface of the exposed active material sheet is: A step of spraying a sodium series liquid onto the surface of the exposed active material sheet; A step of washing the above sodium series liquid; and Drying stage; A method for manufacturing a secondary battery electrode material, characterized in that it includes:

17. In paragraph 16, A method for manufacturing a secondary battery electrode material, characterized in that the above sodium series liquid is one of a sodium ammonia solution and a sodium naphthalene solution.

18. In paragraph 16, A method for manufacturing a secondary battery electrode material, characterized in that the step of washing the sodium series liquid is performed using water.

19. In paragraph 1, In the step of applying a polymer adhesive to the exposed surface of the active material sheet by removing the first release film or the second release film, A method for manufacturing a secondary battery electrode material, wherein the polymer adhesive is a mixture of a polymer resin and a conductor or a conductive polymer resin.

20. In paragraph 19, A method for manufacturing a secondary battery electrode material, characterized in that the polymer resin comprises any one of SBR (styrene butadiene rubber), CMC (carboxy methylcellulose), silicone rubber, and butadiene rubber.

21. In paragraph 1, In the step of attaching the collector plate to the upper surface of the polymer adhesive, A method for manufacturing a secondary battery electrode material, characterized in that the above current collector plate is copper foil or aluminum foil.

22. In paragraph 22, A method for manufacturing a secondary battery electrode material, characterized in that when the above current collector plate is made of copper foil, the current collector plate is subjected to a blackening surface treatment.

23. In paragraph 1, After the step of attaching the collector plate to the upper surface of the polymer adhesive, A method for manufacturing a secondary battery electrode material, characterized by further performing roll pressing.

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