Electrode, method for manufacturing same, and secondary battery including same

Abstract

The present invention relates to an electrode comprising: a current collector having a modulus of 100 GPa or more; a film portion including a conductive primer layer and an electrode mixture film disposed on the conductive primer layer; a length primer portion adjacent to the film portion and provided at at least one end in the MD direction of the current collector; and a width primer portion adjacent to the film portion and provided at at least one end in the TD direction of the current collector.

Description

Electrode, method of manufacturing the same, and secondary battery including the same

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0193407 filed December 20, 2024 and Korean Patent Application No. 10-2025-0203776 filed December 18, 2025, the entire contents of which are incorporated herein.

[0003]

[0004] Technology field

[0005] The present invention relates to an electrode, a method for manufacturing the same, and a secondary battery including the same.

[0006]

[0007] Secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3 players, mobile phones, PDAs, portable game devices, power tools, and E-bikes, but also in large products requiring high output such as electric vehicles and hybrid vehicles, as well as in power storage devices that store surplus power or new and renewable energy and backup power storage devices.

[0008] Typically, a secondary battery is manufactured by applying an electrode active material slurry to a positive electrode current collector and a negative electrode current collector to form an electrode active material layer, then manufacturing a positive electrode and a negative electrode through drying and rolling processes, and then stacking them on both sides of a separator to form an electrode assembly of a predetermined shape, and then housing the electrode assembly in a battery case, injecting an electrolyte, and sealing.

[0009] Meanwhile, during the drying process of the electrode active material slurry, defects such as pinholes or cracks may be induced in the electrode active material layer formed on the current collector as the solvent contained in the slurry evaporates. In addition, since the inner and outer parts of the electrode active material slurry are not dried uniformly during the drying process, there is a risk that the electrode quality may deteriorate due to a powder floating phenomenon caused by the difference in solvent evaporation rates, that is, powders in the parts that dry first rise and form a gap with the parts that dry relatively later.

[0010] To solve the above problem, drying devices capable of controlling the evaporation rate of the solvent are being considered so that the inside and outside of the electrode active material slurry can be dried uniformly; however, these drying devices are very expensive and require significant cost and time to operate, which is disadvantageous in terms of manufacturing processability.

[0011] On the other hand, the solvent included in conventional electrode active material slurries is N-methyl-2-pyrrolidone (NMP), which has a high boiling point and requires high thermal energy and a very long drying oven to dry, making it very unfavorable for mass production. In addition, N-methyl-2-pyrrolidone (NMP) is a toxic substance and is harmful to living organisms, so it has the disadvantage of not being environmentally friendly.

[0012] Therefore, there is a recent trend of active research on dry electrodes that manufacture electrodes without using solvents. The above-mentioned dry electrode is generally manufactured by laminating a free-standing type electrode composite film, which is manufactured in a sheet form and includes an electrode active material, a binder, a conductive material, etc., onto a current collector. This electrode composite film includes a process of first mixing the electrode active material, a carbon material as a conductive material, and a fiberizable binder together using a blender or similar device, then fiberizing the binder by applying shear force through a process such as jet-milling or kneading, and finally calendering the obtained mixture into a film form to manufacture a free-standing film.

[0013] Meanwhile, secondary batteries used to supply power for various automotive motors or included in energy storage systems (ESS) require excellent output characteristics and energy density. Consequently, interest is growing in bipolar batteries capable of achieving high energy density by connecting individual bipolar electrode pairs, each consisting of a positive electrode and a negative electrode, in series.

[0014] However, unlike wet electrodes, dry electrodes are manufactured by placing a separately manufactured electrode composite film on a current collector and then laminating the current collector and the electrode composite film. Therefore, it is not easy in terms of process to manufacture dry electrodes with a specific structure of non-degradable area to create a bipolar battery. In particular, when manufacturing dry electrodes using a roll-to-roll process capable of achieving excellent processability, forming a non-degradable area of ​​a specific structure results in poor resistance characteristics or causes appearance defects, which degrades battery performance.

[0015] In addition, when a barrier is formed to block electrolyte movement in the unoccupied portion of a specific structure, detachment or rupture of the barrier may occur due to poor adhesion between the unoccupied portion and the barrier; therefore, excellent adhesion is required when forming the barrier.

[0016] Therefore, when manufacturing electrodes with a primer portion of a specific structure to ensure excellent adhesion during barrier formation, there is a need to develop an electrode that achieves excellent processability while also realizing outstanding resistance characteristics, high energy density, and is defect-free.

[0017]

[0018] One objective of the present invention is to solve the above-mentioned problems by providing an electrode having high energy density, excellent resistance characteristics, and no appearance defects, comprising a current collector having a modulus greater than a certain value while forming a primer portion for forming a partition structure on the current collector.

[0019] In addition, one objective of the present invention is to solve the above-mentioned problems by providing a method for manufacturing an electrode that can achieve excellent processability without causing appearance defects while forming a primer portion for forming a partition structure on a current collector.

[0020]

[0021] [1] The present invention provides an electrode comprising: a current collector having a modulus of 100 GPa or more; a film portion having a conductive primer layer and an electrode composite film disposed on the conductive primer layer; a length primer portion adjacent to the film portion and provided at least one end in the MD direction of the current collector; and a width primer portion adjacent to the film portion and provided at least one end in the TD direction of the current collector.

[0022] [2] In the present invention [1], the modulus of the current collector may be 100 GPa to 300 GPa.

[0023] [3] In the present invention [1] or [2], the density of the electrode composite film is 2.20 g / cm³ 3 Up to 2.85 g / cm² 3 It could be.

[0024] [4] In at least one of [1] to [3], the present invention has a loading amount of 575 mg / 25 cm of electrode composite film. 2 Up to 1000 mg / 25 cm 2 It could be.

[0025] [5] In at least one of [1] to [4], the thickness of the electrode composite film may be 80 μm to 185 μm.

[0026] [6] In at least one of [1] to [5], the width of the length primer portion may be 0.5 mm to 20 mm.

[0027] [7] In at least one of [1] to [6], the width of the primer portion may be 0.5 mm to 20 mm.

[0028] [8] In at least one of [1] to [7], the length primer part may include a first primer part provided at one end in the MD direction of the current collector and a third primer part provided at the other end opposite the first primer part, and the width primer part may include a second primer part provided at one end in the TD direction of the current collector and a fourth primer part provided at the other end opposite the second primer part.

[0029] [9] In at least one of [1] to [8], the present invention comprises, wherein the electrode is provided on both sides of a current collector, a film portion having the conductive primer layer and the electrode composite film disposed thereon, and the electrode composite films on both sides may include electrode active materials of different polarities.

[0030]

[0010] The present invention provides a method for manufacturing an electrode comprising: a first step of preparing an electrode composite film comprising an electrode active material and a binder having a three-dimensional fiber network structure, and a current collector having a conductive primer layer continuously arranged thereon; a second step of forming a pattern on the electrode composite film using a patterning roll having irregularities formed thereon; and a third step of laminating the electrode composite film with the current collector to manufacture an electrode having a conductive primer layer and a discontinuous electrode composite film arranged on the current collector, wherein the electrode composite film is arranged parallel to the current collector in the TD direction of the current collector and the modulus of the current collector is 100 GPa or more.

[0031]

[0011] In the present invention

[0010] , the patterning roll having the irregularities formed thereon may be a patterning roll having an intaglio formed thereon.

[0032]

[0012] In the present invention

[0010] or

[0011] , the patterning roll having the irregularities formed thereon may further include a cleaning device.

[0033]

[0013] In at least one of

[0010] to

[0012] , the lamination is performed using a lamination roll press unit, and the lamination roll press unit includes two lamination rolls, and the gap between the lamination rolls may be 50 μm to 500 μm.

[0034]

[0014] In at least one of

[0010] to

[0013] , the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the uneven surface area (A1) may be 1.001 to 1.200.

[0035]

[0015] The present invention provides a secondary battery comprising at least one of the electrodes [1] to [9].

[0036]

[0037] The electrode of the present invention is characterized by having a film portion comprising a conductive primer layer and an electrode composite film on a current collector, and a horizontal primer portion adjacent to the film portion, and forming a partition structure in the primer portion. Furthermore, while implementing the above features, the electrode of the present invention can achieve excellent energy density and low resistance characteristics by controlling the modulus of the current collector to a value above a certain level, while simultaneously preventing appearance defects.

[0038] In addition, the method for manufacturing the electrode of the present invention forms a patterned conductive primer layer on a current collector, and by manufacturing the modulus range of the current collector to be greater than a certain value, excellent processability can be achieved while implementing the aforementioned primer portion, and appearance defects can be reduced.

[0039]

[0040] The drawings attached to this specification illustrate preferred embodiments of the present invention and serve to help to better understand the technical concept of the present invention together with the description of the invention above; therefore, the present invention is not to be interpreted as being limited only to the matters described in such drawings. Meanwhile, the shape, size, scale, or ratio of elements in the drawings included in this specification may be exaggerated to emphasize a clearer explanation.

[0041] FIG. 1 is a perspective view of an electrode manufactured according to Example 1.

[0042] Figure 2 is a plan view of an electrode manufactured according to Example 1.

[0043] FIG. 3 is an electrode according to one embodiment of the present invention.

[0044] Figure 4 is a diagram illustrating a conductive primer layer continuously arranged on a current collector.

[0045] Figure 5 is a diagram illustrating an electrode manufactured by laminating a current collector having a conductive primer layer and an electrode composite film.

[0046]

[0047] The present invention will be described in more detail below.

[0048] Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0049] In this specification, "volume cumulative average particle size D 50 In the particle size distribution curve, it refers to the particle size corresponding to 50% of the cumulative volume. The above D 50For example, it can be measured using the laser diffraction method. The laser diffraction method generally enables the measurement of particle sizes ranging from the submicron range to several millimeters, and can obtain results with high reproducibility and high resolution.

[0050] In this specification, "composite composition" refers to a mixture comprising an electrode active material, a binder, and optionally a conductive material, which is physically mixed to form a uniform dispersed phase. As a product of the mixing process according to this specification, it may be a powdered mixture and may substantially not involve a solvent. Here, "substantially not involving a solvent" means that no solvent is introduced or only a minute amount of solvent is introduced during the mixing of the composite composition.

[0051] In this specification, “mixed aggregate” refers to a product of a mixing process (kneading process) according to this specification in which the powdered mixture is converted into a paste-like aggregate as the binder is fiberized under shear force, and the product may have a solid content of 100%.

[0052] In this specification, “powder for electrode” refers to a material in which the mixed aggregate is crushed to form a powder with a smaller particle size, and may mean an electrode material in powder form comprising an electrode active material, a binder, and optionally a conductive material.

[0053] In this specification, the term "electrode composite film" may refer to a free-standing type single sheet manufactured using an "electrode composite" that includes an electrode active material, a binder, and optionally a conductive material, without the involvement of a solvent, or an electrode composite layer laminated onto a current collector. In this specification, the term "free-standing type" means that it can maintain an independent form without relying on other components and can be moved or handled on its own. As described below, the electrode composite film may be formed by compressing the electrode powder. For example, the electrode powder may have a shape forming a layered structure by being accumulated by compression.

[0054] In this specification, "powder-sheeting film" refers to a film formed from the time the powder for the electrode passes through the first rolling roll in a roll-to-roll process to form a sheet shape until it passes through the last rolling roll in the process. It may be a self-supporting sheet, but may be a sheet with relatively weak self-supporting capacity. Here, "powder-sheeting" refers to the process in which the powder for the electrode is formed into a self-supporting sheet shape by the rolling roll of the roll-to-roll process, and "sheeting" refers to a process performed during the process of manufacturing the powder-sheeting film into an electrode composite film, which may refer to the process of rolling the powder-sheeting film.

[0055] In this specification, "three-dimensional fiber network structure" refers to a structure formed by the fiberization of a binder during the process of sheet forming from a composite composition comprising an electrode active material and a binder into an electrode composite film, and may mean a structure in which a plurality of fibers are connected in the up, down, left, and right directions at a plurality of points. The three-dimensional fiber network structure may refer to various forms of structures that can function as a support, enabling the electrode composite film to be a self-standing film, by having a fine fibrous binder form a framework. At this time, the electrode active material and, optionally, a conductive material may be accommodated within the pores formed in the three-dimensional fiber network structure.

[0056] In this specification, the MD direction (Machine Direction) refers to the longitudinal direction of the current collector or electrode composite film, that is, the direction in which the electrode travels during the production of the current collector or electrode composite film, and the TD direction (Transverse Direction) refers to the width direction of the current collector or electrode composite film, that is, the direction perpendicular to the MD direction.

[0057]

[0058] Bipolar batteries are a cell type that offers the advantage of obtaining high voltage by connecting several unit electrode stacks in series, each having a positive electrode layer on one side of a single current collector and a negative electrode layer on the other. However, they are characterized by the fact that the effect of the series connection can only be achieved when each individual unit electrode stack is completely electrochemically isolated. Therefore, to ensure that multiple unit electrode stacks are completely electrochemically isolated, it is essential to completely block the movement of the electrolyte between the unit electrode stacks.

[0059] As mentioned above, in the case of a bipolar electrode in which an anode layer is disposed on one side of a current collector and a cathode layer is disposed on the other side and connected in series, high power and high energy density can be achieved; however, if the movement of the electrolyte within a single electrode is not completely blocked, a short circuit may occur, leading to a decrease in capacitance or, in severe cases, a risk of explosion. Therefore, it is essential to provide a horizontal primer section adjacent to the film section so that excellent adhesion between the current collector and the partition can be achieved, while simultaneously placing materials such as partitions to block the movement of the electrolyte within the single electrode.

[0060] In addition, while providing a horizontal primer portion adjacent to the film portion in the electrode, it is necessary to increase the density of the electrode composite film to achieve a higher energy density. However, when increasing the density of the electrode composite film while implementing the primer portion, the surface resistance of the electrode composite film and the resistance between the current collector and the electrode composite film increase, or appearance defects occur, which frequently degrades battery characteristics or makes electrode manufacturing impossible. Furthermore, problems such as damage to the current collector or damage to the surface flatness of the electrode composite film occur, and misalignment of the positive and negative layers placed on each side of the current collector may lead to problems such as lithium deposition.

[0061] As a result of continuous efforts to realize an electrode that achieves excellent processability, resistance characteristics, and low appearance defects while solving such problems, the inventors discovered that by placing a patterned electrode composite film on a continuously arranged conductive primer layer, and by applying a current collector having a modulus greater than a certain value while forming a primer section adjacent to the film section where the conductive primer layer and the electrode composite film are arranged, it is possible to easily realize a primer section where a partition is installed to manufacture a bipolar electrode, while also realizing a dry electrode having excellent processability, excellent resistance characteristics, and low appearance defects, and thus completed the present invention.

[0062]

[0063] In this specification, each of the electrode, the method of manufacturing the same, and the secondary battery including the same comprises one or more of the technical features and / or technical configurations described below, and these technical features and / or technical configurations may be combined in various ways.

[0064] electrode

[0065] Hereinafter, an electrode according to the present invention will be described with reference to FIGS. 1 and FIGS. 2.

[0066] The electrode (1) according to the present invention comprises: a current collector (10) having a modulus of 100 GPa or more; a film portion (20) having a conductive primer layer (11) and an electrode composite film (12) disposed on the conductive primer layer (11); a length primer portion provided at least one end in the MD direction of the current collector adjacent to the film portion (20); and a width primer portion provided at least one end in the TD direction of the current collector adjacent to the film portion (20).

[0067] For example, the electrode (1) comprises a current collector (10); a conductive primer layer (11) disposed on at least one surface of the current collector and an electrode composite film (12) disposed on the conductive primer layer (11); the electrode (1) comprises a film portion (20) on which the conductive primer layer (11) and the electrode composite film (12) are disposed on the current collector (10); a length primer portion provided at least one end in the MD direction of the current collector adjacent to the film portion (20); and a width primer portion provided at least one end in the TD direction of the current collector adjacent to the film portion (20); and the modulus of the current collector (10) is 100 GPa or more.

[0068]

[0069] In the case of conventionally manufactured dry electrodes, a continuous electrode composite film is placed on at least one surface of a current collector, or an electrode composite film is placed on one surface of a current collector to include at least one unoccupied portion in the TD direction relative to the current collector in order to form a tab portion of a cylindrical battery. In such cases, there is a problem in that a bipolar dry electrode cannot be manufactured because there is no space to form the partition wall that must be placed to manufacture a bipolar dry electrode.

[0070] Therefore, in order to provide a space for the above-mentioned partition to be formed, a horizontal length-free section and a width-free section adjacent to the electrode composite film must be provided simultaneously; however, if the electrode composite film is placed on the current collector while such a free section is provided, problems such as appearance defects or poor resistance characteristics and energy density occur.

[0071] In addition, in the case of horizontal length-blank and width-blank sections adjacent to the electrode composite film, sufficient adhesion to the partition to be installed later cannot be achieved, leading to problems such as detachment and fracture of the partition.

[0072] However, in the present invention, as described below in the electrode manufacturing method, a patterned electrode composite film is placed on a continuously arranged conductive primer layer, and a current collector having a modulus of a value greater than a certain value is used, thereby providing a bipolar electrode with excellent resistance characteristics and energy density characteristics, as well as excellent appearance characteristics.

[0073] In addition, since the electrode according to the present invention has a length primer portion and a width primer portion arranged adjacent to a film portion in which a conductive primer layer and an electrode composite film are arranged, excellent adhesion between the current collector and the partition is achieved when a partition is subsequently formed to block the electrolyte, thereby improving battery characteristics.

[0074]

[0075] The electrode according to the present invention comprises: a current collector having a modulus of 100 GPa or more; a film portion having a conductive primer layer and an electrode composite film disposed on the conductive primer layer; a length primer portion adjacent to the film portion and provided at least one end in the MD direction of the current collector; and a width primer portion adjacent to the film portion and provided at least one end in the TD direction of the current collector.

[0076]

[0077] When attempting to implement a horizontal primer section adjacent to the film section as described above while utilizing a continuous process, a problem arises where the electrode composite film is pushed backward in the driving direction during lamination. When this problem occurs, defects in the appearance of the electrode composite film may occur, the film may encroach upon the primer section, and in severe cases, the process may be halted.

[0078] To solve the above problem, the present invention implements a specific primer pattern and a film pattern, and applies a current collector having a modulus of 100 GPa or more to the electrode.

[0079]

[0080] The modulus of the above current collector is 100 GPa or higher. If the modulus of the above current collector is less than 100 GPa, significant appearance defects may occur during the lamination process of the electrode composite film and the current collector; the electrode composite film may come into excessive contact with the primer portion, rendering it unable to perform its function as a primer; or the flatness of the electrode composite film surface may be compromised, leading to non-uniform battery characteristics. Furthermore, the current collector may be damaged by lamination, or the alignment of the electrode composite film placed on the current collector may become distorted, resulting in safety issues such as lithium deposition.

[0081] Preferably, the modulus of the current collector may be 100 GPa or more, 120 GPa or more, 140 GPa or more, 160 GPa or more, 170 GPa or more, or 180 GPa or more, and may be 300 GPa or less, 280 GPa or less, 260 GPa or less, 240 GPa or less, or 220 GPa or less, and more preferably, the modulus of the current collector may be 180 GPa to 220 GPa. When satisfying the above range, it may be desirable in that damage to the current collector can be prevented when laminating the electrode composite film and the current collector, and when applying strong pressure to achieve adhesion between the current collector and the conductive primer layer, or between the conductive primer layer and the electrode composite film, the change in the area of ​​the current collector may not be large, and damage to the primer portion can be prevented. In addition, it may be desirable in that it can prevent a decrease in energy density caused by the current collector being excessively thick, while also preventing a decrease in processability and economic efficiency due to the poor processability of the current collector.

[0082] The modulus of the above-mentioned current collector refers to the slope (stress / strain) in the elastic region of the stress-strain curve of the current collector. Since the methods for measuring the above-mentioned modulus are known to experts in the art, a detailed explanation is omitted, and the equipment used to measure the modulus may be, for example, a Universal Testing Machine. More specifically, the modulus can be measured by calculating the slope at 0.2% of the strain on the graph appearing in the stress-strain curve.

[0083]

[0084] Hereinafter, the electrode according to the present invention will be described in more detail.

[0085]

[0086] Film Department

[0087] An electrode according to the present invention comprises a conductive primer layer and a film portion on which the electrode composite film is disposed. Preferably, the electrode comprises a current collector; a conductive primer layer disposed on at least one surface of the current collector and an electrode composite film disposed on the conductive primer layer, and a film portion on which the conductive primer layer and the electrode composite film are disposed.

[0088]

[0089] According to one embodiment of the present invention, the density of the electrode composite film is 2.20 g / cm³ 3 Up to 2.85 g / cm² 3 It may be, preferably 2.20 g / cm³ 3 Above, 2.25g / cm² 3 Above 2.30 g / cm³ 3 Above, 2.35g / cm² 3 Above, 2.40g / cm² 3 Above, 2.46 g / cm³ 3 Above, 2.47g / cm² 3 Above, 2.48 g / cm³ 3 Above, 2.49g / cm²3 Above, 2.50 g / cm³ 3 Above, 2.51 g / cm³ 3 Above or 2.52 g / cm³ 3 It may be abnormal, 2.85 g / cm³ 3 Below, 2.80g / cm³ 3 Below, 2.75g / cm³ 3 Below, 2.70g / cm³ 3 Below, 2.69 g / cm³ 3 Below, 2.68 g / cm³ 3 Below, 2.67 g / cm³ 3 Less than or equal to 2.66 g / cm³ 3 It may be less than or equal to, and more preferably, 2.52 g / cm³ 3 Up to 2.66 g / cm² 3 It may be possible. If the above range is satisfied, excellent energy density and resistance characteristics can be realized, while preventing appearance defects of the electrode composite film caused by the problem of the electrode composite film being pushed backward in the driving direction during lamination. Furthermore, it may be desirable in that, through appropriate harmony with the current collector modulus range, it is possible to realize the primer and film sections of specific patterns while realizing the above characteristics.

[0090]

[0091] According to one embodiment of the present invention, the loading amount of the electrode composite film is 560 mg / 25 cm 2 Up to 1000 mg / 25 cm 2 is. Preferably, 560 mg / 25 cm 2 Above, 565mg / 25cm 2 Above, 570mg / 25cm 2 Above, 575mg / 25cm 2 Above, 577mg / 25cm 2 Above, 579mg / 25cm 2 Above or 580 mg / 25 cm 2 It may be more than 1000mg / 25cm 2 Below, 800mg / 25cm 2 Below, 700mg / 25cm 2Below, 650mg / 25cm 2 Below, 600mg / 25cm 2 Below, 597mg / 25cm 2 Below, 594mg / 25cm 2 Less than or equal to 590 mg / 25 cm 2 It may be less than or equal to 580 mg / 25 cm 2 Up to 590 mg / 25 cm 2 It may be possible. If the above range is satisfied, it may be desirable in that it is possible to achieve high output characteristics while realizing excellent energy density, prevent appearance defects of the electrode composite film caused by the problem of the electrode composite film being pushed backward in the driving direction during lamination, and ensure excellent processability.

[0092]

[0093] According to one embodiment of the present invention, the thickness of the electrode composite film may be 80㎛ to 185㎛, preferably 80㎛ or more, 85㎛ or more, or 87㎛ or more, and may be 185㎛ or less, 170㎛ or less, 155㎛ or less, 140㎛ or less, 130㎛ or less, 120㎛ or less, 110㎛ or less, 100㎛ or less, or 95㎛ or less, and more preferably 87㎛ to 95㎛. When satisfying the above range, it may be desirable in that excellent energy density characteristics and resistance characteristics are realized in appropriate harmony with the current collector modulus range, while preventing appearance defects of the electrode composite film caused by the problem of the electrode composite film being pushed backward in the driving direction during lamination.

[0094]

[0095] Primer section

[0096] Hereinafter, the primer portion according to the present invention will be described.

[0097]

[0098] Referring to FIGS. 1 and 2, a current collector (10) according to the present invention comprises a film portion (20) in which a conductive primer layer (11) and an electrode composite film (12) are arranged, a length primer portion adjacent to the film portion and provided at least one end in the MD direction of the current collector, and a width primer portion adjacent to the film portion and provided at least one end in the TD direction of the current collector. In the case of such a length primer portion and a width primer portion, excellent adhesion can be achieved while serving to provide a space for forming a partition to block the movement of electrolyte within a single electrode, thereby enabling the realization of a dry electrode structure suitable for making a bipolar electrode.

[0099] Specifically, as illustrated in FIGS. 1 and 2, the length primer portion is provided at at least one end of the current collector (10) in the MD direction of the current collector, and the length primer portion is adjacent to the film portion (20). The length primer portion arranged as described above is a space for forming a partition to block the movement of electrolyte within one electrode thereafter, and can be a space suitable for forming a partition in the MD direction of the current collector, and can be a space suitable for forming a more closely attached partition adjacent to the film portion, and can achieve excellent adhesion.

[0100] As shown in FIGS. 1 and 2, the width primer portion is provided at at least one end of the current collector (10) in the TD direction of the current collector, and the width primer portion is adjacent to the film portion (20). The width primer portion arranged as described above is a space for forming a partition to block the movement of electrolyte within one electrode thereafter, and can be a space suitable for forming a partition in the TD direction of the current collector, and can be a space suitable for forming a more closely attached partition adjacent to the film portion, and can achieve excellent adhesion.

[0101]

[0102] According to one embodiment of the present invention, the width of the length primer portion may be 0.5 mm to 20 mm, preferably 0.8 mm to 15 mm, and more preferably 1 mm to 10 mm. When satisfying the above range, it may be easy to form a barrier in the MD direction of the current collector and easy to achieve excellent adhesion. For example, since the width of the length primer portion is not too wide, it is desirable to improve processability by preventing waste of raw materials while achieving excellent energy density, and since the width of the length primer portion is not too narrow, it is desirable in that the barrier structure to be subsequently formed is sufficient to block electrolyte movement, or to prevent the problem of the barrier structure collapsing due to poor adhesion at the interface between the length primer portion and the barrier structure.

[0103]

[0104] According to one embodiment of the present invention, the width of the wide primer portion may be 0.5 mm to 20 mm, preferably 0.8 mm to 15 mm, and more preferably 1 mm to 10 mm. When the above range is satisfied, it may be easy to form a barrier in the TD direction of the current collector. For example, since the width of the wide primer portion is not too wide, it is desirable to prevent waste of raw materials and improve processability while achieving excellent energy density, and since the width of the wide primer portion is not too narrow, it is desirable in that the barrier structure to be subsequently formed is sufficient to block electrolyte movement, or to prevent the problem of the barrier structure collapsing due to poor adhesion at the interface between the wide primer portion and the barrier structure.

[0105]

[0106] With reference to FIGS. 1 and 2, the length primer portion and the width primer portion will be described in detail.

[0107]

[0108] According to one embodiment of the present invention, the length primer portion may include a first primer portion (31) provided at one end in the MD direction of the current collector and a third primer portion (33) provided at the other end opposite to the first primer portion (31). The first primer portion (31) and the third primer portion (33) may each be independently adjacent to the film portion. When the above conditions are satisfied, the outer surface of the film portion may be surrounded by the primer portion. For example, since the primer portion may be adjacent to both sides in the horizontal MD direction of the film portion, it is advantageous in that excellent adhesion can be achieved while easily forming a partition to block the movement of the electrolyte to be injected into the film portion, thereby enabling the realization of a dry electrode for bipolar applications.

[0109]

[0110] According to one embodiment of the present invention, the width primer portion may include a second primer portion (32) provided at one end in the TD direction of the current collector and a fourth primer portion (34) provided at the other end opposite to the second primer portion (32). The second primer portion (32) and the fourth primer portion (34) may each be independently adjacent to the film portion. When the above conditions are satisfied, the outer surface of the film portion may be surrounded by the primer portion. For example, since the primer portion may be adjacent to both sides in the horizontal TD direction of the film portion, it may be desirable in that excellent adhesion can be achieved while easily forming a partition to block the movement of the electrolyte to be injected into the film portion, and a dry electrode for bipolar applications can be realized.

[0111]

[0112] According to one embodiment of the present invention, the length primer portion may include a first primer portion (31) provided at one end in the MD direction of the current collector and a third primer portion (33) provided at the other end opposite to the first primer portion (31), and the width primer portion may include a second primer portion (32) provided at one end in the TD direction of the current collector and a fourth primer portion (34) provided at the other end opposite to the second primer portion (32). The first primer portion (31) to the fourth primer portion (34) may each independently be adjacent to the film portion. When the above conditions are satisfied, the primer portion may be adjacent to four horizontal surfaces of the film portion, so that a partition wall to block the movement of the electrolyte to be injected into the film portion can be easily formed while achieving excellent adhesion, which may be desirable in terms of realizing a dry electrode for bipolar applications.

[0113]

[0114] According to one embodiment of the present invention, the width of the first primer portion (31) to the fourth primer portion (34) may each be independently 0.5 mm to 20 mm, preferably 0.8 mm to 15 mm, and more preferably 1 mm to 10 mm.

[0115]

[0116] According to one embodiment of the present invention, when the first primer part (31) to the fourth primer part (34) are provided, the widths of the first primer part (31) to the fourth primer part (34) may each be independently different. Preferably, the width of the first primer part (31) and the width of the third primer part (33) may be the same, and the width of the second primer part (32) and the width of the fourth primer part (34) may be the same.

[0117]

[0118] An electrode according to one embodiment of the present invention will be described with reference to FIG. 3.

[0119] According to one embodiment of the present invention, the electrode (1) is provided on both sides of a current collector (10) with a film portion having the conductive primer layer (11, 41) and the electrode composite film (12, 42) disposed therein, and the electrode composite films (12, 42) on both sides may include electrode active materials of different polarities. When the above conditions are satisfied, the composition of the active material included in the electrode composite film disposed on one side of the current collector and the electrode composite film disposed on the other side of the current collector located opposite to the one side may be different, such as a positive active material and a negative active material, respectively. In this way, when the electrode active materials on the upper and lower sides of a single current collector are different, such as positive and negative active materials, it may be desirable to manufacture a dry electrode for bipolar applications.

[0120] The positive active material and the negative active material are omitted as they will be described later, and the conductive material and / or fiberizable binder that may be included in each of the electrode composite films (12, 42) may each be independent.

[0121]

[0122] According to one embodiment of the present invention, as described above, film portions are provided on both sides of a current collector, and when the electrode composite films on both sides contain electrode active materials of different polarities, a configuration such as the length primer portion and width primer portion formed on one side of the current collector described above is also formed on the other side of the current collector, so that a first primer portion (not shown) and a second primer portion (not shown) may be provided on the other side of the current collector.

[0123] Preferably, a configuration such as the first primer section and the fourth primer section formed on one side of the current collector described above may also be formed on the other side of the current collector, so that the other side of the current collector may be provided with a first-1 primer section (not shown) to a fourth-1 primer section (not shown). In this case, the width of the first-1 primer section (not shown) located on the other side of the first primer section may be the same as or different from the width of the first primer section described above. The width of the second-1 primer section (not shown) located on the other side of the second non-primer section may be the same as or different from the width of the second primer section described above. The width of the third-1 primer section (not shown) located on the other side of the third primer section may be the same as or different from the width of the third primer section described above. The width of the fourth-1 primer section (not shown) located on the other side of the fourth primer section may be the same as or different from the width of the fourth primer section described above.

[0124]

[0125] Meanwhile, the electrode composite film may include an electrode active material and a binder having a three-dimensional fiber network structure. Preferably, the electrode composite film may include an electrode active material, a binder having a three-dimensional fiber network structure, and a conductive material.

[0126] Hereinafter, the electrode composite film according to the present invention will be described in more detail.

[0127]

[0128] (1) Electrode active material

[0129] The above electrode composite film may include an electrode active material.

[0130] There are no special limitations on the electrode active material as long as it is a commonly used electrode active material; for example, the electrode active material may be a positive electrode active material or a negative electrode active material.

[0131] The above-mentioned cathode active material is a compound capable of reversible intercalation and deintercalation of lithium, and specifically, may include a lithium metal oxide containing lithium and one or more metals such as cobalt, manganese, nickel, or aluminum. More specifically, the lithium metal oxide is a lithium-manganese-based oxide (e.g., LiMnO2, LiMn2O4, etc.), a lithium-cobalt-based oxide (e.g., LiCoO2, etc.), a lithium-nickel-based oxide (e.g., LiNiO2, etc.), or a lithium-nickel-manganese-based oxide (e.g., LiNi 1-Y Mn Y O2(here, 0 <Y<1), LiMn 2-Z Ni Z O4 (where 0 < Z < 2), etc.), lithium-nickel-cobalt oxides (e.g., LiNi 1-Y1 Co Y1 O2(here, 0 <Y1<1) 등), 리튬-망간-코발트계 산화물(예를 들면, LiCo 1-Y2 Mn Y2 O2(here, 0 <Y2<1), LiMn 2-Z1 Co Z1 O4 (where 0 < Z1 < 2), etc.), lithium-nickel-manganese-cobalt oxides (e.g., Li(Ni p Co q Mn r )O2(where, 0<p<1, 0<q<1, 0<r<1, p+q+r=1) or Li(Ni p1 Co q1 Mn r1 )O4 (where 0<p1<2, 0<q1<2, 0<r1<2, p1+q1+r1=2), etc.), or lithium-nickel-cobalt-transition metal (M) oxide (e.g., Li(Ni p2 Co q2 Mn r2 M s2)O2(wherein M is selected from the group consisting of Al, Fe, V, Cr, Ti, Ta, Mg, and Mo, and p2, q2, r2, and s2 are the atomic fractions of independent elements, respectively, 0 < p2 < 1, 0 < q2 < 1, 0 < r2 < 1, 0 < s2 < 1, p2 + q2 + r2 + s2 = 1), etc.), lithium iron phosphate (e.g., Li 1+a Fe 1-x M x (PO 4-b )X b (Here, M is one or more selected from Al, Mg and Ti, and X is one or more selected from F, S and N, and -0.5≤a≤0.5, 0≤x≤0.5, 0≤b≤0.1) etc., and any one or more of these compounds may be included.

[0132] Among these, the lithium metal oxides mentioned above include LiCoO2, LiMnO2, LiNiO2, and lithium nickel manganese cobalt oxide (e.g., Li(Ni)) in that they can improve the capacity characteristics and stability of the battery. 1 / 3 Mn 1 / 3 Co 1 / 3 )O2, Li(Ni 0.6 Mn 0.2 Co 0.2 )O2, Li(Ni) 0.5 Mn 0.3 Co 0.2 )O2, Li(Ni 0.7 Mn 0.15 Co 0.15 )O2 and Li(Ni 0.8 Mn 0.1 Co 0.1 )O2, etc.), lithium nickel-cobalt-aluminum oxide (e.g., Li(Ni 0.8 Co 0.15 Al 0.05 )O2, etc.), or lithium nickel-cobalt-manganese-aluminum oxide (e.g., Li(Ni 0.86 Co 0.05 Mn 0.07 Al 0.02It may be lithium iron phosphate (e.g., LiFePO4), etc., and any one or more of these may be used. More specifically, the electrode active material may include lithium nickel-cobalt-manganese-aluminum oxide in terms of being able to form a uniform and stable film-shaped electrode composite.

[0133] More preferably, the positive active material may include a lithium phosphate-based material, specifically, the positive active material may include a compound of the following chemical formula 1, more specifically, the positive active material may be a compound of the following chemical formula 1, and even more specifically, the positive active material may include LiFePO4.

[0134] [Chemical Formula 1]

[0135] Li 1+x [Fe 1-a-b Mn a M 1 b ]PO4

[0136] In the above chemical formula 1, M 1 It contains one or more elements selected from the group consisting of Al, Mg, Ni, Co, Ti, Ga, Cu, V, Mo, Nb, W, Zr, Ce, In, Zn, and Y, and -0.5≤x≤0.5, 0≤a≤0.8, and 0≤b≤0.1. If the above conditions are satisfied, it may be desirable in terms of achieving excellent economic efficiency and stability.

[0137] The above-mentioned negative electrode active material may include at least one selected from the group consisting of lithium metal, a carbon material capable of reversibly intercalating / deintercalating lithium ions, a metal or an alloy of these metals and lithium, a metal composite oxide, a material capable of doping and dedoping lithium, and a transition metal oxide.

[0138] As for the carbon material capable of reversibly intercalating / deintercalating the above lithium ions, any carbon-based negative electrode active material commonly used in lithium-ion secondary batteries may be used without particular limitation, and representative examples include crystalline carbon, amorphous carbon, or a combination thereof. Examples of the above crystalline carbon include graphite such as amorphous, plate-like, flake-like, spherical, or fibrous natural graphite or artificial graphite, and examples of the above amorphous carbon include soft carbon (low-temperature calcined carbon) or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0139] As the above metal or alloy of these metals and lithium, a metal selected from the group consisting of Cu, Ni, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn, or an alloy of these metals and lithium may be used.

[0140] The above metal composite oxides include PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5, Li x Fe2O3(0≤x≤1), Li x WO2(0≤x≤1) and Sn x Me 1-x Me y O z (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, Group 1, 2, and 3 elements of the periodic table, halogens; 0 <x≤1; 1≤y≤3; 1≤z≤8) 로 이루어진 군에서 선택되는 것이 사용될 수 있다.

[0141] Materials capable of doping and dedoping the above lithium include Si and SiO x(0 <x≤2), Si-Y 합금(상기 Y는 알칼리 금속, 알칼리 토금속, 13족 원소, 14족 원소, 전이금속, 희토류 원소 및 이들의 조합으로 이루어진 군에서 선택되는 원소이며, Si은 아님), Sn, SnO2, Sn-Y(상기 Y는 알칼리 금속, 알칼리 토금속, 13족 원소, 14족 원소, 전이금속, 희토류 원소 및 이들의 조합으로 이루어진 군에서 선택되는 원소이며, Sn은 아님) 등을 들 수 있고, 또한 이들 중 적어도 하나와 SiO2를 혼합하여 사용할 수도 있다. 상기 원소 Y로는 Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Ge, P, As, Sb, Bi, S, Se, Te, Po 및 이들의 조합으로 이루어진 군에서 선택될 수 있다.

[0142] Examples of the above transition metal oxides include lithium-containing titanium composite oxide (LTO), vanadium oxide, and lithium vanadium oxide.

[0143]

[0144] According to one embodiment of the present invention, the electrode active material may be included in an amount of 80 to 99 parts by weight based on the total weight of the electrode composite film, and preferably in an amount of 90 to 99 parts by weight. Satisfying the above range is desirable in terms of increasing the capacity and energy density of the electrode.

[0145]

[0146] (2) Binder

[0147] The electrode composite film may include a binder having a three-dimensional fiber network structure. In one aspect, the binder functions to form a three-dimensional fiber network structure so that the electrode composite film can stand on its own. The binder is not specified as being capable of fiberization, that is, if it can form a three-dimensional fiber network structure within the electrode composite film through fiberization and provide a void capable of accommodating an electrode active material and, optionally, a conductive material.

[0148] The fiberization of the above binder refers to a treatment that divides the polymer applied as a binder into smaller fibers, which can be performed, for example, by applying mechanical shear force, and as a result, the surface is loosened and fiberized, forming multiple microfibers, and thereby can include a three-dimensional fiber network structure.

[0149]

[0150] The fiberizable binder may preferably include one or more selected from the group consisting of polytetrafluoroethylene (PTFE) and polyolefins, more preferably may include polytetrafluoroethylene, and even more preferably may be polytetrafluoroethylene.

[0151] At this time, the binder may additionally include one or more selected from the group consisting of polyethylene oxide (PEO), polyvinylidene fluoride (PVdF), polyvinylidene fluoride-cohexafluoropropylene (PVdF-HFP), polyacrylic acid (PAA), polyvinylpyrrolidone (PVP), and polyolefin. Preferably, it may further include high-density polyethylene. When two or more types of the binder are mixed, the polytetrafluoroethylene may be included in an amount of 60% by weight or more based on the total weight of the binder.

[0152]

[0153] According to one embodiment of the present invention, the binder may be included in an amount of 0.1 to 10 parts by weight with respect to the total weight of the electrode composite film, and preferably in an amount of 0.1 to 5.0 parts by weight. Satisfying the above range is desirable in that it can achieve a degree of fiberization suitable for manufacturing a self-standing sheet while also having excellent resistance characteristics.

[0154]

[0155] (3) Challenge material

[0156] The above electrode composite film may include a conductive material.

[0157] The above conductive material is a component for further improving the conductivity of the electrode active material, and such conductive material is not particularly limited as long as it is conductive without causing chemical changes in the battery, and for example, carbon powder such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, or thermal black; graphite powder such as natural graphite, artificial graphite, or graphite with a highly developed crystal structure; conductive fibers such as carbon fibers or metal fibers; fluorocarbon powder; conductive powder such as aluminum powder or nickel powder; conductive whiskers such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc. may be used. In detail, to ensure uniform mixing of the conductive material and to improve conductivity, it may include one or more selected from the group consisting of activated carbon, graphite, carbon black, and carbon nanotubes (CNT).

[0158]

[0159] According to one embodiment of the present invention, the conductive material may be included in an amount of 0.1 to 10 parts by weight with respect to the total weight of the electrode composite film, and preferably in an amount of 0.1 to 5.0 parts by weight. Satisfying the above range is desirable in that it can form an excellent conductive path while also realizing an excellent capacity density.

[0160]

[0161] Meanwhile, according to one embodiment of the present invention, the current collector is not particularly limited as long as it has conductivity without causing chemical changes in the battery and its modulus satisfies the aforementioned range. For example, the current collector may be copper, stainless steel, aluminum, nickel, titanium, calcined carbon, or a surface treated with carbon, nickel, titanium, silver, etc., on the surface of copper, aluminum, or stainless steel, or an aluminum-cadmium alloy. Preferably, the current collector may include stainless steel.

[0162] The thickness of the current collector may be 3 μm to 500 μm, but is not limited thereto. Additionally, fine irregularities may be formed on the surface of the current collector to increase the adhesion of the electrode composite film. Preferably, the thickness of the current collector may be 3 μm to 30 μm, more preferably 5 μm to 20 μm, and even more preferably 8 μm to 15 μm. Satisfying the above range may be desirable in that it can achieve excellent energy density while preventing breakage of the current collector.

[0163]

[0164] Meanwhile, according to one embodiment of the present invention, the conductive primer layer may include a conductive primer, and the conductive primer may include a conductive material and a binder. The conductive material is not limited to any material that exhibits conductivity, but may, for example, be a carbon-based material. The binder may include fluorine-based (including PVDF and PVDF copolymers), acrylic binders, and water-based binders that are soluble in solvents.

[0165]

[0166] Meanwhile, according to one embodiment of the present invention, the electrode of the present invention may be a dry electrode, and preferably a dry electrode for bipolar applications.

[0167]

[0168] Method for manufacturing an electrode

[0169] Hereinafter, a method for manufacturing an electrode according to the present invention will be described.

[0170]

[0171] A method for manufacturing an electrode according to the present invention comprises: a first step of preparing an electrode composite film comprising an electrode active material and a binder having a three-dimensional fiber network structure, and a current collector having a conductive primer layer continuously arranged thereon; a second step of forming a pattern on the electrode composite film using a patterning roll having irregularities formed thereon; and a third step of laminating the electrode composite film with the current collector to manufacture an electrode having a conductive primer layer on the current collector and a discontinuous electrode composite film arranged on the conductive primer layer; wherein the electrode composite film is arranged parallel to the current collector in the TD direction of the current collector, and the modulus of the current collector is 100 GPa or more.

[0172]

[0173] As described above, in order to manufacture a dry electrode for bipolar applications, it is necessary to manufacture the electrode such that a primer portion is provided on the outer surface of a film portion comprising a conductive primer layer and an electrode composite film disposed on the conductive primer layer. In particular, when using a roll-to-roll process capable of achieving excellent processability while manufacturing the dry electrode for the above pattern, it was not easy to manufacture the pattern by a continuous process.

[0174] Accordingly, the present invention aims to realize the aforementioned pattern by first placing a conductive primer layer with excellent adhesion continuously on a current collector so as to provide the aforementioned length and width primer portions, then forming a pattern on an electrode composite film using a patterning roll having irregularities, and laminating the electrode composite film with a current collector on which the conductive primer layer is continuously formed.

[0175] However, when attempting to bond the electrode composite film only at selective locations by implementing the aforementioned primer pattern while utilizing a continuous process, a problem arises in which the electrode composite film is pushed backward in the driving direction during the lamination process. When such a problem occurs, defects in the appearance of the electrode composite film may occur, the electrode composite film may excessively encroach upon the primer area, the electrode composite film may fail to adhere only to the selective locations, and in severe cases, the process may be halted.

[0176] Accordingly, to solve the above-mentioned problem, the present invention laminates the patterned electrode composite film onto a current collector having a conductive primer layer arranged continuously, and controls the modulus of the current collector to be 100 GPa or more.

[0177] If the modulus of the current collector is less than 100 GPa, significant appearance defects may occur during the lamination process of the patterned electrode composite film and the current collector. Additionally, the patterned electrode composite film may come into excessive contact with the primer, rendering it unable to perform its function as a primer, or the flatness of the electrode composite film surface may be compromised, leading to non-uniform battery characteristics. Furthermore, the current collector may be damaged by lamination, or the alignment of the electrode composite film placed on the current collector may become distorted, resulting in safety issues such as lithium deposition. The preferred modulus of the current collector has been described above and is therefore omitted.

[0178]

[0179] Hereinafter, the method for manufacturing an electrode according to the present invention will be described in detail step by step.

[0180]

[0181] Stage 1

[0182] The first step is to prepare an electrode composite film comprising an electrode active material and a binder having a three-dimensional fiber network structure, and a current collector having a conductive primer layer arranged continuously.

[0183]

[0184] The above electrode active material and binder are omitted as they have been described above.

[0185]

[0186] Referring to Fig. 4, a current collector in which the conductive primer layers are arranged continuously can be seen.

[0187]

[0188] Meanwhile, the thickness, composition, etc. of the above-mentioned entire house have been previously described and are therefore omitted.

[0189]

[0190] Meanwhile, according to one embodiment of the present invention, the electrode composite film can be manufactured by including steps (A1) to (A4) as follows.

[0191]

[0192] (A1) Step

[0193] The step involves mixing an electrode active material and a binder to form a composite composition. Preferably, the mixing is performed so that the electrode active material and the binder are uniformly distributed. Optionally, a conductive material may be further included, and since the mixture is in powder form, the mixing can be performed by various methods that enable simple mixing, without limitation. However, since the method for manufacturing the electrode is a dry method that does not use a solvent, the mixing can be performed by dry mixing, and the materials can be mixed by introducing them into a device such as a mixer or blender.

[0194] At this time, the mixing can be performed in a mixer at 5,000 rpm to 20,000 rpm for 10 seconds to 5 minutes, and more specifically, at 8,000 rpm to 15,000 rpm for 30 seconds to 3 minutes. When performed within the above range, the materials can be uniformly mixed, thereby improving battery performance.

[0195]

[0196] (A2) Step

[0197] Next, a step of forming a mixed aggregate by kneading while applying shear force to the above composite composition can be performed. That is, the above A2 step may be a fiberization process of a binder using a binder capable of forming a three-dimensional fiber network structure.

[0198] The above fiberization process can be performed, for example, through mechanical milling or kneading, and there are no particular limitations as long as it is generally performed, but preferably, it can be performed by high-temperature, low-shear kneading, and can be performed through a kneader such as a twin-screw extruder, for example. Through such kneading, the binder (preferably a fiberizable binder) is fiberized, and the electrode active material powders, or optionally powders containing a conductive material, are combined or linked to form a mixed aggregate with 100% solid content.

[0199] The above mixing can be performed at a speed of 10 rpm to 100 rpm, and more specifically at a speed of 20 rpm to 70 rpm. In addition, the above mixing can be performed for 1 minute to 120 minutes, and more specifically at 2 minutes to 60 minutes. When the above range is satisfied, appropriate fiberization can proceed, and a structurally stable three-dimensional fiber network structure can be formed while being fiberized uniformly throughout.

[0200] In addition, the above mixing can be performed under high temperature and pressure conditions higher than atmospheric pressure, and more specifically, under pressure conditions higher than atmospheric pressure.

[0201] More specifically, the above mixing can be performed at a temperature of 50°C to 230°C, preferably 90°C to 200°C. When mixing is performed at a high temperature such as the above range, the fiberization of the binder and agglomeration by mixing can be effectively achieved, and the problem of breakage of the fiberized binder can be appropriately prevented.

[0202] In addition, it can be performed at a pressure above atmospheric pressure, specifically at a pressure of 1 atm to 3 atm, and more specifically at 1.1 atm to 3 atm. When performed within the above range, the problem of breakage of the binder undergoing fiberization can be adequately prevented, and the problem of the density of the aggregate becoming too high can be prevented.

[0203] That is, according to the present invention, when a high-temperature, low-shear mixing process is performed under high temperature and pressure conditions greater than atmospheric pressure instead of high-shear mixing, the effect intended by the present invention can be achieved.

[0204]

[0205] (A3) Step

[0206] Next, a step of obtaining an electrode powder by crushing the mixed aggregate produced through the above mixing step may be performed. Preferably, a step of manufacturing an electrode powder by crushing the mixed aggregate may be performed.

[0207] Although the mixed aggregate produced through the above mixing process may be immediately pressurized to form a sheet (sheeting, e.g., a calendering process), in this case, the aggregate may need to be pressed under high pressure and high temperature to produce a thin film. Consequently, problems may arise where the film density becomes too high or a uniform film cannot be obtained. Therefore, the mixed aggregate produced as described above can be crushed to produce a powder for electrodes.

[0208] The device used for the above grinding is not particularly limited, but preferably can be performed with a device such as a blender or a grinder.

[0209] The grinding above can be performed at a speed of 1,000 rpm to 15,000 rpm for 5 seconds to 45 minutes, preferably at a speed of 3,000 rpm to 10,000 rpm for 1 minute to 30 minutes. When performed within the above range, sufficient grinding can be achieved to produce powder of a size suitable for film formation, and a large amount of fine powder may not be generated in the mixed aggregate.

[0210] The average particle size of the above electrode powder may be 10㎛ to 3,000㎛, more specifically 50㎛ to 1,500㎛, and even more specifically 100㎛ to 700㎛. When the above range is satisfied, an electrode composite film with uniform thickness and density can be formed, and excellent electrode composite film properties can be secured.

[0211]

[0212] Meanwhile, the electrode powder according to the present invention may additionally include fillers to suppress the expansion of the electrode, although this is not essential. The fillers are not particularly limited as long as they are fibrous materials that do not cause chemical changes in the battery, but, for example, at least one selected from olefinic polymers such as polyethylene and polypropylene; and fibrous materials such as glass fibers and carbon fibers may be included.

[0213]

[0214] (A4) Step

[0215] Next, a step of manufacturing a powder sheeting film by sheeting the electrode powder can be performed. Preferably, after manufacturing a powder sheeting film by heat-pressing the electrode powder, a step of manufacturing an electrode composite film can be performed. For example, it may include sheet-forming the electrode powder into an electrode composite film.

[0216] The above A4 step may be a process of manufacturing a powder sheeting film or an electrode composite film in the form of a self-standing sheet by heat-pressing the electrode powder obtained as described above using rolling rolls in a roll-to-roll process (calendering process, sheeting process) that includes two or more pairs of rolling rolls.

[0217] The above roll-to-roll process (calendar process) may include a roll press section, and the roll press section may have rolling rolls arranged in pairs facing each other, and multiple such pairs of rolling rolls may be arranged continuously in the roll press section. When multiple rolling rolls are arranged continuously, the temperature and peripheral speed ratio (ratio of rotational speeds of a pair of rolls) of each roll may be the same, or, in this case, the rotational speed ratio of each rolling roll may be independently and appropriately adjusted within a range of 1:1 to 1:10. In addition, the manufactured electrode composite film may be fed back into the roll press section to be adjusted to an appropriate thickness and subjected to heating and pressing 1 to 10 times.

[0218] In one aspect, the above step A4 may include a step of producing a powder sheeting film by powder sheeting the electrode powder (A4a); and a step of producing an electrode composite film by calendering the powder sheeting film (A4b). After converting the powder into a sheet in step A4a, the powder may be rolled in step A4b to reduce thickness while improving strength, and to satisfy the porosity and loading amount required for the electrode.

[0219] In addition, the powder sheeting film produced by the above powder sheeting may be subjected to heat pressing 1 to 10 times through the calendering process of step A4b for reasons such as additional fiberization, securing mechanical properties, or controlling porosity. At this time, the peripheral speed ratio between rolls can be appropriately applied within the range of the peripheral speed ratio in powder sheeting, and the number of times can also be appropriately controlled to match the target properties.

[0220] When performing the lamination described below, it may be preferable to perform it after one or more or two or more heat pressings in step A4b.

[0221]

[0222] Phase 2

[0223] The second step is described in detail with reference to Fig. 5.

[0224] The second step is to form a pattern on the electrode composite film using a patterning roll having irregularities formed thereon.

[0225]

[0226] In order to place a patterned electrode composite film on a current collector (10) having a conductive primer layer (11) arranged continuously as in FIG. 5, it is necessary to prepare a patterned electrode composite film before lamination.

[0227] In the present invention, a method is used to continuously remove a portion of an electrode composite film manufactured through a roll-to-roll process using a patterning roll having irregularities formed thereon, so that after lamination between a current collector (10) having a conductive primer layer (11) arranged therein and an electrode composite film, the aforementioned primer portion pattern can be provided.

[0228] A pattern of a certain shape is formed on the electrode composite film by the patterning roll having the above-mentioned irregularities. For example, unnecessary parts excluding the certain shape of the continuously produced electrode composite film are removed by the irregularities, so that an electrode composite film of a certain shape can be manufactured to have the aforementioned primer pattern.

[0229]

[0230] According to one embodiment of the present invention, the patterning roll having the irregularities formed thereon may be a patterning roll having an intaglio portion formed thereon. When the above condition is satisfied, it is desirable in that an electrode composite film is transferred to the raised portion excluding the intaglio portion, so that an electrode composite film having the same shape as the intaglio portion can participate in the manufacturing process.

[0231]

[0232] According to one embodiment of the present invention, the shape of the intaglio portion may vary depending on the specifications of the desired electrode composite film, the area of ​​the intaglio portion may vary depending on the specifications of the desired electrode composite film, the width of the intaglio portion may vary depending on the specifications of the desired electrode composite film, and the length of the intaglio portion may vary depending on the specifications of the desired electrode composite film. For example, the intaglio portion may have an area of ​​70mm × 70mm.

[0233]

[0234] According to one embodiment of the present invention, the patterning roll having irregularities may further include a cleaning device. When the above conditions are satisfied, excellent processability can be maintained by removing the unnecessary electrode composite film transferred to the patterning roll having irregularities.

[0235]

[0236] Stage 3

[0237] The third step is described in detail with reference to Fig. 5.

[0238] The third step is to manufacture an electrode by laminating the electrode composite film with the current collector (10), wherein a conductive primer layer (11) is disposed on the current collector and a discontinuous electrode composite film (12) is disposed on the conductive primer layer (11).

[0239] Referring to FIG. 5, it can be seen that the discontinuous electrode composite film (12) is arranged parallel to the current collector (10) in the TD direction of the current collector.

[0240]

[0241] The above lamination can be performed using a lamination roll press unit, and preferably, the lamination can be performed by a roll press method using the lamination roll press unit. For example, the lamination roll press unit may have two lamination rolls arranged to face each other.

[0242]

[0243] According to one embodiment of the present invention, the lamination is performed using a lamination roll press unit, and the lamination roll press unit includes a lamination roll. The temperature of the lamination roll may be 20°C to 200°C, preferably 50°C to 180°C, and more preferably 80°C to 150°C. When the above range is satisfied, the temperature may be suitable for manufacturing a dry electrode by transferring the electrode composite film to a desired location while reducing the occurrence of appearance defects of the electrode composite film.

[0244]

[0245] According to one embodiment of the present invention, the lamination is performed using a lamination roll press unit, and the lamination roll press unit includes two lamination rolls, and the rotational speed ratio of the lamination rolls may be 1:1 to 1:2, preferably the rotational speed ratio of the lamination rolls may be 1:1.0 to 1:1.5, and more preferably the rotational speed ratio of the lamination rolls may be 1:1.0 to 1:1.1. When the above range is satisfied, the electrode composite film and the current collector are appropriately rolled, and excellent adhesion between the electrode composite film and the current collector can be realized.

[0246]

[0247] According to one embodiment of the present invention, the lamination is performed using a lamination roll press unit, and the lamination roll press unit includes two lamination rolls. The gap between the lamination rolls may be 50 μm to 500 μm, preferably the gap between the lamination rolls may be 75 μm to 300 μm, and more preferably the gap between the lamination rolls may be 90 μm to 200 μm. When the above range is satisfied, an electrode composite film satisfying a density within an appropriate range with a non-excessive gap can be manufactured, and excellent adhesion between the conductive primer layer and the electrode composite film can be achieved. Furthermore, due to the non-narrow gap, breakage of the current collector can be prevented, while also preventing appearance defects where the electrode composite film is pushed out at the rear end of the process travel direction.

[0248]

[0249] According to one embodiment of the present invention, by controlling the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the uneven surface area (A1) to a specific range, excellent resistance characteristics and processability can be achieved without causing appearance defects.

[0250]

[0251] According to one embodiment of the present invention, the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the uneven surface area (A1) may be 1.001 to 1.200, preferably 1.001 or more, 1.01 or more, 1.02 or more, 1.03 or more, 1.04 or more, 1.05 or more, or 1.059 or more, 1.200 or less, 1.19 or less, 1.18 or less, 1.17 or less, 1.16 or less, 1.15 or less, 1.14 or less, 1.13 or less, 1.12 or less, or 1.119 or less, and more preferably 1.059 to 1.119.

[0252] If the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the uneven surface area (A1) is excessively low, the conductive primer layer and the electrode composite film may be grounded with a very weak force, and it may be difficult to attach the conductive primer layer and the electrode composite film. Furthermore, even if attachment is achieved, there is a problem that the adhesive strength may decrease, resulting in high interfacial resistance. Conversely, if the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the uneven surface area (A1) is excessively high, the conductive primer layer and the electrode composite film may be grounded with a very strong force. Consequently, problems may arise where the electrode composite film is not transferred only to the intended location, and breakage of the current collector may occur. Additionally, appearance defects may occur where the electrode composite film is pushed backward in the process travel direction, and problems may arise regarding poor resistance characteristics. Accordingly, when the above range is satisfied, it is possible to implement a method for manufacturing an electrode having a desired pattern without causing appearance defects and having excellent resistance characteristics and processability.

[0253]

[0254] secondary battery

[0255] A secondary battery according to the present invention comprises a structure in which electrodes and separators according to the present invention are alternately stacked. Preferably, the secondary battery may comprise electrodes, separators, and an electrolyte according to the present invention. For example, the secondary battery may be a secondary battery comprising a liquid electrolyte and an all-solid-state battery comprising a solid electrolyte.

[0256]

[0257] In the case where a secondary battery according to one embodiment of the present invention is a secondary battery comprising a liquid electrolyte, a separator may be included between a plurality of electrodes. The separator separates the negative electrode and the positive electrode and provides a pathway for the movement of lithium ions. Any separator typically used as a separator in a secondary battery may be used without special limitations, and it is particularly desirable that it has low resistance to the movement of electrolyte ions and excellent electrolyte moisture retention capacity. Specifically, a porous polymer film, such as a porous polymer film made of a polyolefin-based polymer like an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, and an ethylene / methacrylate copolymer, or a laminated structure of two or more layers thereof may be used. In addition, a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fibers or polyethylene terephthalate fibers, may be used. In addition, a coated separator containing ceramic components or polymer materials may be used to ensure heat resistance or mechanical strength, and may optionally be used in a single-layer or multi-layer structure.

[0258] In addition, if the secondary battery is an all-solid-state battery, the solid electrolyte membrane can be manufactured to perform the function of the separator.

[0259]

[0260] In addition, the above electrolytes may include organic liquid electrolytes, inorganic liquid electrolytes, solid polymer electrolytes, gel-type polymer electrolytes, solid inorganic electrolytes, molten inorganic electrolytes, etc., which can be used in the manufacture of secondary batteries, but are not limited to these.

[0261] Specifically, the electrolyte may include an organic solvent and a lithium salt. The organic solvent may be used without special limitations as long as it can serve as a medium through which ions involved in the electrochemical reaction of the battery can move. Specifically, the organic solvent may include ester-based solvents such as methyl acetate, ethyl acetate, γ-butyrolactone, and ε-caprolactone; ether-based solvents such as dibutyl ether or tetrahydrofuran; ketone-based solvents such as cyclohexanone; and aromatic hydrocarbon-based solvents such as benzene and fluorobenzene. Carbonate-based solvents such as dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (MEC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), and propylene carbonate (PC); alcohol-based solvents such as ethyl alcohol and isopropyl alcohol; nitriles such as R-CN (where R is a straight-chain, branched, or cyclic hydrocarbon group having 2 to 20 carbon atoms and may include a double bond, a directional ring, or an ether bond); amides such as dimethylformamide; dioxolanes such as 1,3-dioxolane; or sulfolanes may be used. Among these, a carbonate-based solvent is preferred, and a mixture of a cyclic carbonate (e.g., ethylene carbonate or propylene carbonate, etc.) having high ionic conductivity and high dielectric constant that can improve the charge / discharge performance of the battery, and a low-viscosity linear carbonate-based compound (e.g., ethylmethyl carbonate, dimethyl carbonate or diethyl carbonate, etc.) is more preferred.

[0262]

[0263] The above lithium salt may be used without special restrictions as long as it is a compound capable of providing lithium ions used in secondary batteries. Specifically, the anion of the above lithium salt is F - , Cl - , Br - , I - , NO3 - , N(CN)2 - , BF4 - , CF3CF2SO3 - , (CF3SO2)2N - , (FSO2)2N - , CF3CF2(CF3)2CO - , (CF3SO2)2CH - , (SF5)3C - , (CF3SO2)3C - , CF3(CF2)7SO3 - , CF3CO2 - , CH3CO2 - , SCN - and (CF3CF2SO2)2N - It may be at least one selected from the group consisting of, and the lithium salt is, LiPF6, LiClO4, LiAsF6, LiBF4, LiSbF6, LiAlO4, LiAlCl4, LiCF3SO3, LiC4F9SO3, LiN(C2F5SO3)2, LiN(C2F5SO2)2, LiN(CF3SO2) 2. LiCl, LiI, or LiB(C2O4)2, etc., may be used. It is preferable to use the lithium salt in a concentration range of 0.1M to 4.0M, preferably 0.5M to 3.0M, and more preferably 1.0M to 2.0M. When the concentration of the lithium salt falls within the above range, the electrolyte has appropriate conductivity and viscosity, so it can exhibit excellent electrolyte performance and lithium ions can move effectively.

[0264]

[0265] In addition to the above electrolyte components, the above electrolyte may further include one or more additives for the purpose of improving the lifespan characteristics of the battery, suppressing the decrease in battery capacity, and improving the discharge capacity of the battery, such as, for example, haloalkylene carbonate-based compounds like difluoroethylene carbonate, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, triamide hexaphosphate, nitrobenzene derivative, sulfur, quinone imine dye, N-substituted oxazolidinone, N,N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, or aluminum trichloride. In this case, the additive may be included in an amount of 0.1 to 10.0 weight% based on the total weight of the electrolyte.

[0266]

[0267] In addition, since the secondary battery according to the present invention stably exhibits excellent discharge capacity, output characteristics, and capacity retention rate, it is useful in portable devices such as mobile phones, laptop computers, and digital cameras, as well as in the field of electric vehicles such as hybrid electric vehicles (HEVs).

[0268]

[0269] battery box

[0270] According to one embodiment of the present invention, a battery box comprising a plurality of secondary batteries may be provided. The battery box may include a plurality of secondary batteries and may include a packaging that accommodates the plurality of secondary batteries. Herein, the battery box may be, for example, a battery module or a battery pack.

[0271] Since the above secondary battery stably exhibits excellent discharge capacity, output characteristics, and capacity retention rate, it can be usefully applied in portable devices such as mobile phones, laptops, and digital cameras, or in the field of electric vehicles such as Full Electric Vehicles (FEVs) and Hybrid Electric Vehicles (HEVs).

[0272] The above battery box may be used as one or more power devices selected from the group consisting of a power tool; an electric vehicle including a Full Electric Vehicle (FEV), a Hybrid Electric Vehicle (HEV), and a Plug-in Hybrid Electric Vehicle (PHEV); or a power storage system.

[0273]

[0274] According to one embodiment of the present invention, an electric device or electronic device may be provided that includes the battery box, wherein the battery box is included as a power source.

[0275]

[0276]

[0277] Examples

[0278] Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0279]

[0280] Example 1

[0281] (1) Manufacturing of electrode composite film

[0282] 96g of lithium iron phosphate (BTR, LFP-S20) as the electrode active material, 0.5g of carbon black as the conductive material, and 3.5g of polytetrafluoroethylene (PTFE) as the binder were introduced into a blender and mixed at 10,000 rpm for 1 minute to prepare a composite composition. Then, the composite composition was introduced into a kneader and kneaded at a rotation speed of 50 rpm for 5 minutes at 1.1 atm and 150℃ to prepare a mixed aggregate. The mixed aggregate was introduced into a blender, ground at 10,000 rpm for 40 seconds, and classified through a sieve having pores of 1 mm to prepare an electrode powder. Subsequently, the electrode powder was sheeted using a calendering roll (roll diameter: 88 mm, roll temperature: 100℃) in a roll-to-roll process to produce an electrode composite film.

[0283]

[0284] (2) Dry electrode manufacturing

[0285] A current collector (thickness 15 μm) having a continuous conductive primer layer and a modulus of 193 GPa was prepared, and a patterning roll having a 70 mm × 70 mm irregularity (intaglio pattern) was used to continuously remove a portion of the electrode composite film prepared in (1) to form a pattern, and then the electrode composite film was laminated using a lamination roll (roll temperature: 100°C) to obtain a dry electrode composed of a current collector / conductive primer layer / electrode composite film.

[0286] The above dry electrode includes a film portion in which a conductive primer layer and an electrode composite film are disposed, and first to fourth primer portions, each containing a conductive primer layer, are disposed adjacent to the film portion and on the outer surface of the film portion. At this time, residual electrode composite film remaining in addition to the irregularities (engraved pattern) is continuously removed using a cleaning device.

[0287]

[0288] Examples 2–4 and Comparative Examples 1–2

[0289] By controlling the gap between the lamination rolls and the modulus of the current collector, the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the uneven surface area (A1) and the density (g / cm³) of the electrode composite film are obtained as shown in Table 1 below. 3 ), loading amount of electrode composite film (mg / 25cm 2 A dry electrode was manufactured in the same manner as in Example 1, except that the thickness (μm) of the electrode composite film was controlled.

[0290]

[0291] The above manufacturing method is summarized and shown in Table 1.

[0292]

[0293] Current collector modulus (GPa) Electrode composite film density (g / cm³) 3 ) Electrode composite film thickness (㎛) Electrode composite film loading amount (mg / 25cm) 2 Example 1 1932.5294.4595 Example 2 1932.6191.1595 Example 3 1932.6689.4595 Comparative Example 1802.4397.8595 Comparative Example 2802.5294.5595

[0294] Experimental Example 1: Evaluation of defects in electrode composite film formed on dry electrode

[0295] The dry electrodes prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were checked, and if the electrode composite film came into excessive contact with the primer portion beyond the film portion, it was evaluated as X, and if no defect occurred, it was evaluated as O.

[0296] The evaluation results are shown in Table 2 below.

[0297]

[0298] Experimental Example 2: Measurement of electrode layer resistance, interfacial resistance, and adhesion strength

[0299] 1) Electrode layer resistance (Ωcm)

[0300] For the dry electrodes prepared in Examples 1 to 3 and Comparative Examples 1 to 2, they were cut into 50 mm x 50 mm pieces, and a current of 100 μA was applied to the electrode using the MP resistance measurement method, and the resistance value of the surface of the electrode composite film was measured by the potential difference measured between 46 probes.

[0301] The measurement results are shown in Table 2 below.

[0302]

[0303] 2) Interface resistance (Ωcm) 2 )

[0304] For the dry electrodes prepared in Examples 1 to 3 and Comparative Examples 1 to 2, they were cut into 50 mm x 50 mm pieces, and a current of 100 μA was applied to the electrode using the MP resistance measurement method, and the resistance value between the electrode composite film and the current collector layer was measured by the potential difference measured between 46 probes.

[0305]

[0306] The measurement results are shown in Table 2 below.

[0307]

[0308] Experimental Example 3: Measurement of Adhesion Strength

[0309] For the dry electrodes prepared in Examples 1 to 3 and Comparative Examples 1 to 2, they were cut to 100 mm x 20 mm, and the surface of the electrode composite film inside the dry electrode was attached to a slide glass measuring 75 mm x 25 mm using double-sided tape. That is, the slide glass was attached to an area corresponding to half of the length direction of the electrode. Then, an evaluation sample was prepared by rubbing a roller 10 times to ensure that the double-sided tape was attached uniformly.

[0310] Next, the slide glass portion of the evaluation sample was fixed to the sample stage of a Universal Testing Machine (UTM), and the electrode half without the slide glass attached was connected to the load cell of the UTM. The load applied to the load cell was measured while moving the load cell up to 80 mm at a speed of 100 mm / min. At this time, the minimum value of the load measured in the 20 mm to 40 mm range of the travel section was determined as the adhesion strength (gf / 20 mm) of each sample. After a total of 5 measurements for each electrode, the average value is shown in Table 2 below.

[0311]

[0312] Defective evaluation electrode layer resistance (Ωcm) interface resistance (Ωcm) 2 )Adhesion strength (gf / 20mm) Example 1 O4.7750.06541.4 Example 2 O4.4620.06246.5 Example 3 O4.2710.06056.8 Comparative Example 1 O5.8210.54712.7 Comparative Example 2 X5.2550.32921.7

[0313] As can be seen in Table 2 above, Examples 1 to 3 show superior electrode layer resistance and interfacial adhesion compared to Comparative Examples 1 and 2. In particular, referring to Comparative Example 1, it can be seen that the electrode layer resistance, interfacial resistance, and adhesion are very inferior when manufacturing a dry electrode to prevent defects, and in Comparative Example 2, it can be seen that defects occurred while the electrode layer resistance, interfacial resistance, and adhesion were poor.

[0314]

[0315] [Explanation of the symbol]

[0316] 1: Electrode

[0317] 10: The whole house

[0318] 11: Conductive primer layer

[0319] 12: Electrode composite film

[0320] 20: Film Department

[0321] 31: 1st Primer Section

[0322] 32: 2nd Primer Section

[0323] 33: 3rd Primer Section

[0324] 34: 4th Primer Section

[0325] 41: Conductive primer layer

[0326] 42: Electrode composite film

[0327] D1: Width of the first primer section

[0328] D2: Width of the second primer section

[0329] D3: Width of the 3rd primer section

[0330] D4: Width of the 4th primer section

Claims

1. An entire house with a modulus of 100 GPa or more; A film portion having a conductive primer layer and an electrode composite film disposed thereon on the conductive primer layer; A length primer portion adjacent to the above film portion and provided at least one end in the MD direction of the current collector; and An electrode comprising: a width primer portion adjacent to the above film portion and provided at least one end in the TD direction of the current collector.

2. In Claim 1, The electrode, wherein the modulus of the above current collector is 100 GPa to 300 GPa.

3. In Claim 1, The density of the above electrode composite film is 2.20 g / cm³ 3 Up to 2.85 g / cm² 3 Phosphorus, electrode.

4. In Claim 1, The loading amount of the above electrode composite film is 560 mg / 25 cm 2 Up to 1000 mg / 25 cm 2 Phosphorus, electrode.

5. An electrode having a thickness of 80㎛ to 185㎛ of the electrode composite film.

6. In Claim 1, An electrode having a length primer portion with a width of 0.5 mm to 20 mm.

7. In Claim 1, An electrode having a width of 0.5 mm to 20 mm for the above-mentioned primer portion.

8. In Claim 1, The above length primer portion includes a first primer portion provided at one end in the MD direction of the current collector and a third primer portion provided at the other end opposite to the first primer portion. The electrode, wherein the above-mentioned width primer portion comprises a second primer portion provided at one end in the TD direction of the current collector and a fourth primer portion provided at the other end opposite to the second non-transparent portion.

9. In Claim 1, The above electrode is, A film portion having a conductive primer layer and an electrode composite film is provided on both sides of a current collector, and The above-described electrode composite film comprises electrode active materials of different polarities.

10. A first step of preparing an electrode composite film comprising an electrode active material and a binder having a three-dimensional fiber network structure, and a current collector having a conductive primer layer arranged continuously thereon; A second step of forming a pattern on the electrode composite film using a patterning roll having irregularities; and A third step of laminating the electrode composite film with the current collector to manufacture a dry electrode having a conductive primer layer on the current collector and a discontinuous electrode composite film disposed on the conductive primer layer; The above electrode composite film is arranged parallel to the current collector in the TD direction of the current collector, and A method for manufacturing an electrode in which the modulus of the above-mentioned current collector is 100 GPa or more 11. In Claim 10, A method for manufacturing an electrode, wherein the patterning roll having the above-mentioned irregularities is a patterning roll having an intaglio formed thereon.

12. In Claim 10, A method for manufacturing an electrode, wherein the patterning roll having the above-mentioned irregularities further includes a cleaning device.

13. In Claim 10, The above lamination is performed using a lamination roll press unit, and The above lamination roll press unit includes two lamination rolls, and A method for manufacturing an electrode, wherein the gap between the lamination rolls is 50㎛ to 500㎛.

14. In Claim 10, A method for manufacturing an electrode, wherein the ratio (A2 / A1) of the area (A2) of the electrode composite film after lamination to the area (A1) of the uneven surface is 1.001 to 1.

200.

15. A secondary battery comprising the electrode of claim 1.

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