KR102168229B1 - An electrode for an electrochemical device and a method for manufacturing the same - Google Patents

Abstract

The present invention relates to an electrode for an electrochemical device having improved electrolyte impregnation properties and a method of manufacturing the same. In the electrode according to the present invention, at least one pattern portion is formed on a surface, and the pattern portion is provided by laser etching.

Description

An electrode for an electrochemical device and a method for manufacturing the electrode TECHNICAL FIELD [An electrode for an electrochemical device and a method for manufacturing the same}

The present invention relates to an electrode for an electrochemical device and a method of manufacturing the electrode. In more detail, the present invention relates to an electrode for an electrochemical device with improved electrolyte impregnation properties and a method of manufacturing the same.

As portable electronic devices such as mobile phones and notebook computers are developed, the demand for secondary batteries as an energy source is rapidly increasing. In recent years, the use of secondary batteries as a power source for hybrid electric vehicles (HEV) and electric vehicles (EV) has been realized. Accordingly, many studies are being conducted on secondary batteries that can meet various needs, and in particular, demand for lithium secondary batteries having high energy density, high discharge voltage, and output is increasing.

The secondary battery for this purpose is required to have high capacity, high energy density, and excellent life characteristics. In order to satisfy these characteristics, the electrode assembly must be completely impregnated with the electrolyte so that electrode reactions between the electrodes can be actively generated. If the electrode assembly is incompletely impregnated with the electrolyte, the reaction between the electrodes is not smooth, so the resistance increases, the output characteristics and the capacity of the battery drop rapidly, resulting in a decrease in battery performance and a shortened lifespan, as well as high resistance. As a result, you are exposed to the risk of battery deterioration or explosion.

Therefore, it is urgent to develop an electrochemical device such as a battery to improve the performance and safety of the battery by increasing the electrolyte impregnation property of the electrode assembly.

An object of the present invention is to provide an electrode for an electrochemical device having excellent electrolyte impregnation properties and a method of manufacturing the same. In addition, another object of the present invention is to provide an electrode assembly including the electrode and a method of manufacturing the electrode assembly. On the other hand, it will be easily understood that the objects and advantages of the present invention can be realized by means or methods described in the claims, and combinations thereof.

The present invention provides an electrode with improved electrolyte impregnation and a method of manufacturing the electrode.

A first aspect of the present invention is an electrode current collector; And an electrode active material layer formed on at least one side of the electrode current collector, wherein the electrode active material layer includes a pattern portion having a concave pattern formed on a surface thereof and a non-pattern portion in which the pattern is not formed. It is a dragon electrode.

A second aspect of the present invention is that in the first aspect, the pattern portion includes a pattern in the form of a furrow.

In a third aspect of the present invention, in the second aspect, at least one furrow is formed on the surface of the electrode active material layer.

In a fourth aspect of the present invention, in the third aspect, at least one end of the furrow is connected to the edge of the electrode active material layer.

A fifth aspect of the present invention is that in the third aspect, any one furrow formed on the surface of the electrode active material layer intersects with or does not cross another furrow.

In a sixth aspect of the present invention, in any one of the first to fifth aspects, the area of the pattern portion is 1% to 10% relative to 100% of the surface area of the electrode active material layer.

In a seventh aspect of the present invention, in any one of the first to sixth aspects, the difference in porosity between the patterned portion and the non-patterned portion is within 20%.

An eighth aspect of the present invention relates to an electrode assembly for an electrochemical device comprising an anode, a cathode, and a separator interposed between the anode and the cathode, wherein at least one of the cathode and the anode is from the first aspect of the present invention. According to any of the seventh aspects.

A ninth aspect of the present invention relates to a method of manufacturing an electrode according to any one of the '1 to 8', the method comprising (S1) applying a slurry for forming an electrode active material on at least one surface of the electrode current collector Step to do; (S2) drying the slurry; And (S3) forming a pattern portion having a concave pattern on the surface of the dried slurry, wherein (S3) is performed by a laser etching method.

A tenth aspect of the present invention further includes the step of rolling the electrode active material layer (S4) after performing the step (S3), wherein the rolling is performed using a rolling member.

In the eleventh aspect of the present invention, in the tenth aspect, the rolled member is surface-treated to have a pattern matching the pattern formed on the surface of the electrode active material layer.

In a twelfth aspect of the present invention, in the tenth aspect, the rolling is such that the difference in porosity between the pattern portion and the non-pattern portion is within 20%.

Since the electrode according to the present invention has a concave pattern on its surface and the pattern does not come into close contact with the separator, the electrolyte can easily penetrate into the electrode assembly through the pattern. Accordingly, the electrode assembly using the electrode has an improved impregnation rate for an electrolyte and an electrolyte impregnation property. Accordingly, the electrode including the electrode according to the present invention has an effect of improving battery performance, such as life characteristics, output characteristics, and resistance characteristics.

In addition, the electrode manufacturing method according to the present invention can eliminate the problem of capacity reduction because the electrode active material is less detached. In addition, since the pattern and the electrode surface are pressed evenly during rolling of the electrode surface, the rolling density and porosity of the electrode active material layer exhibit uniform distribution without local differences.

The accompanying drawings illustrate preferred embodiments of the present invention, and explain the principles of the present invention together with the detailed description, and the scope of the invention is not limited thereto. Meanwhile, the shape, size, scale, or ratio of elements in the drawings included in the present specification may be exaggerated to emphasize a clearer description.
1 and 2 are schematic views of an electrode according to a specific embodiment of the present invention.
3 is a schematic diagram of a process in which an electrolyte is impregnated with an electrode and a separator in a conventional electrode assembly.
4 shows a flow chart of a manufacturing process of an electrode according to a specific embodiment of the present invention.
5A to 5D schematically show each step of the manufacturing process of an electrode according to a specific embodiment of the present invention.
6A and 6B schematically show various methods of forming a pattern on an electrode active material layer.
7 is a schematic view showing an electrode assembly according to a specific embodiment of the present invention.
8 is a diagram illustrating an electrolyte solution injection direction for an electrode assembly according to a specific embodiment of the present invention.
9 is a schematic view showing a manufacturing process of an electrode assembly according to a specific embodiment of the present invention.
10A to 10D are photographs showing the electrode surfaces etched in Examples 1 to 4.
11 is a photograph showing the electrode surface etched in Example 5.
12 is a photograph showing the electrode surface etched in Example 6.

The terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor shall appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, and thus various alternatives that can be substituted for them at the time of application It should be understood that there may be equivalents and variations.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

A first aspect of the present invention relates to an electrode for an electrochemical device.

The electrode according to the present invention includes a current collector and an electrode active material layer coated on at least one surface of the current collector. The electrode may be an anode or a cathode. An electrode formed by coating a positive electrode active material on a current collector functions as a positive electrode, and an electrode formed by coating a negative active material on a current collector functions as a negative electrode.

The electrode according to the present invention includes a pattern portion including a concave pattern and a non-pattern portion in which the pattern is not formed in the electrode active material layer, and the concave pattern may be provided as a flow path of an electrolyte solution or gas.

1 and 2 are schematic views of an electrode 100 for an electrochemical device according to a specific embodiment of the present invention. Referring to this, the electrode according to the present invention is coated with an electrode active material layer 110 on one surface of the current collector 120, and the electrode active material layer has a pattern portion 111 having a concave pattern and a non-patterned pattern. The pattern part 112 is provided. In the present invention, the concave pattern refers to a portion of the electrode active material layer having a height lower than that of the peripheral portion. In one embodiment of the present invention, the concave pattern may have a furrow shape, and the furrow shape is, for example, a linear shape having a predetermined length.

One or more furrows may be formed on the surface of the electrode active material layer. When two or more furrows are formed, one furrow may or may not intersect with the other furrow. In a specific embodiment of the present invention, when two or more furrows are formed, the furrows may be formed parallel to each other.

1 schematically illustrates that a plurality of furrows are formed in an electrode active material layer, and they are arranged parallel to each other. In addition, FIG. 2 schematically shows a state in which one furrow is disposed to cross each other with another furrow.

In a specific embodiment of the present invention, the furrow-shaped concave pattern is formed such that at least one end of the concave pattern is connected to the edge of the electrode active material layer (see FIGS. 1 and 2 ). When the concave pattern is formed as described above, when an electrode assembly including the electrode is manufactured, the furrow formed in the electrode in the electrode assembly is opened to the outside of the electrode assembly, so that the electrolyte can easily flow into and out of the electrode assembly. In addition, when the electrolyte is introduced into the electrode assembly, it may be provided as a passage through which air present in the electrode assembly is exhausted.

3 is a photograph showing a cross section of an electrode assembly manufactured according to the prior art, in which an electrolyte flow path is not formed on the surface of the electrode active material layer, and the entire surface of the electrode active material layer is in close contact with the separator. When the electrolyte is injected into the electrode assembly in this state, since the electrolyte must penetrate between the active material particles in order to impregnate the electrode, the penetration path extends to the inside of the electrode, thereby increasing the impregnation time. In addition, when the viscosity of the electrolyte solution is high, this tendency may worsen. In addition, when air is not exhausted when impregnated with the electrolyte and remains in the form of bubbles between the active material particles, a portion in which the electrolyte cannot penetrate may occur, which may cause a decrease in capacity.

In a specific embodiment of the present invention, the area of the pattern on the surface of the electrode active material layer is 50% or less. When manufacturing an electrode assembly by stacking an electrode active material layer and a separator, the pattern part does not come into close contact with the separator, so if the area of the pattern part excessively exceeds the above range, an ion transfer path may increase and battery performance may deteriorate.

In the present invention, the pattern of the pattern portion may be any pattern as long as it allows the electrolyte to move into the electrode to be accelerated, and is not limited to a special type of pattern. In a specific embodiment of the present invention, the pattern may be a stripe pattern. Referring to FIG. 5, in the case of rolling the electrode by a roll press, the stripe pattern may be formed to be parallel to the running direction of the roll press.

In a specific embodiment of the present invention, the spacing of the furrows in the stripe pattern is preferably 100 μm or more. If the gap between the furrows is narrower than the above range, the electrode surface of the non-patterned portion directly facing the roll during electrode rolling may be broken. On the other hand, the width of the furrow is sufficient as long as the electrolyte can move, and may be, for example, 0.1 µm to 10 µm.

In addition, in a specific embodiment of the present invention, the electrode has the same porosity (Gurley value) of the patterned portion and the non-patterned portion, or within 20% or within 10%. When a single electrode has a large portion and a small portion with a large porosity, it is difficult to diffuse lithium ions from the electrode surface layer to the inside in a small portion, so that excessive reaction occurs only on the surface, and the portion is relatively early deteriorated. May occur. Therefore, it is preferable that the difference in porosity of the non-pattern portion and the pattern portion is small, which is preferably adjusted to adjust the applied pressure so that the difference in porosity of the non-pattern portion and the pattern portion is preferably within the above range in the electrode rolling step described later. .

A second aspect of the present invention relates to a method of manufacturing an electrode for an electrochemical device according to the present invention. In the present invention, the method is characterized in that the laser etching method is applied when forming the concave pattern.

4 is a process flow diagram of a method of manufacturing an electrode according to an embodiment of the present invention, and FIGS. 5A to 5D schematically show each step of the manufacturing process. With reference to this, the electrode manufacturing method will be described in detail.

First, an electrode current collector is prepared (see Fig. 5A). In a specific embodiment of the present invention, the current collector is not particularly limited as long as it has conductivity without causing chemical changes to the battery, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or A surface-treated aluminum or stainless steel surface with carbon, nickel, titanium, silver, or the like may be used.

Next, a slurry for forming an electrode active material layer is applied to at least the surface of the current collector (see FIG. 5B). It can be carried out on one side or both sides of the current collector of the slurry. In a specific embodiment of the present invention, the active material-forming slurry is a dispersion composition in which components necessary for manufacturing an electrode, such as an electrode active material, a binder, and a conductive material, are uniformly dispersed in a dispersion medium. In a specific embodiment of the present invention, the application of the slurry may be performed continuously or discontinuously using various methods such as slot die coating, slide coating, and curtain coating.

Thereafter, the slurry is dried to remove the solvent. The drying temperature of the slurry is not particularly limited, but is 70°C to 150°C.

Next, a pattern portion in a concave shape is formed on the surface of the electrode active material layer that has been dried (FIG. 5C), and the pattern portion may be formed in the shape of a furrow extending at least one end to the edge of the electrode active material layer as described above. .

In a specific embodiment of the present invention, the pattern formation step is performed by laser etching.

When forming a pattern on the electrode active material layer, a method of rolling with a rolled member having a pattern corresponding to the pattern part of the electrode active material layer (M1) or removing a part of the slurry using a patterning cutter (PC) (M2) ) Can be used. 6A is a schematic diagram of the M1 method. According to this, a higher pressure is applied to the pattern portion (A1) where the pattern is formed by the protrusion on the surface of the rolling member, compared to the non-pattern portion (A2), so that the porosity of the pattern portion is lowered, resulting in a non-uniform porosity pattern of the electrode active material layer. Overall ventilation can also lead to electrical charges. Further, even if the electrolyte flows into the pattern portion, impregnation of the electrolyte into the active material layer, that is, between particles of the active material layer, is not promoted due to the low porosity of the pattern portion. Further, FIG. 6B shows a method of forming a pattern by the M2 method using a patterning cutter. In the method of removing a part of the slurry by such a patterning cutter, the active material may be excessively desorbed, resulting in a problem of deteriorating electrode capacity, and it is difficult to form a precise pattern.

On the other hand, in the present invention, a desired pattern can be accurately implemented by performing a patterning process by laser etching, and precise and precise patterning is possible. In addition, laser etching does not cause thermal damage to the electrode active material layer because energy can be effectively transferred to a narrow area by irradiating light of a specific wavelength.

In a specific embodiment of the present invention, the laser etching may be performed using an IR laser, an excimer laser, a Yag laser, a CO ₂ laser, etc. It can be appropriately selected from among various conventional laser etching methods.

According to a specific embodiment of the present invention, the patterning by laser etching may use a gas medium or a solid-state medium.

The gas medium is selected from He-Ne, CO ₂ , Ar, and Excimer laser, and the solid-state medium includes Nd:YAG, Nd:YVO4, and Ytterbium fiber. You can choose from among them.

In laser etching, the line width of the pattern part can be adjusted by adjusting the wavelength or output of the laser beam. In a specific embodiment of the present invention, the laser beam wavelength is 300 ~ 2000nm, the wavelength of the laser beam can be used by selecting a wavelength of 1.06um, 532nm, 355nm, 266nm, 248nm. In addition, soft etching may be performed by adjusting the frequency of the laser beam to 100 to 1000 kHz.

Next, the electrode active material layer on which the concave pattern is formed is rolled (S4). In general, the electrode manufacturing process performs a rolling process of compressing the electrode in order to increase the capacity density of the active material after coating the active material on the electrode current collector and increase adhesion between the electrode current collector and the active material coating layer. In a specific embodiment of the present invention, the rolling process is performed using a rolling member, and the rolling member may be a rolling roller or a rolling jig. At this time, it is preferable to appropriately adjust the pressure so that the porosity of the non-patterned portion and the patterned portion is within 20% as described above. According to a specific embodiment of the present invention, the applied pressure during the rolling may be appropriately adjusted in the range of 0.1 to 90 MPa, or 0.1 to 50 MPa, or 0.1 to 30 MPa or 0.1 to 10 MPa (0.5 to 1.5 tons in terms of linear pressure). I can. In addition, in a specific embodiment of the present invention, the rolling may be performed by a roll press, at which time the speed of the roll press is 20 to 60 m/min.

According to a specific embodiment of the present invention, a pattern having irregularities formed on the surface of the roller or jig is added, and the pattern may be matched with the pattern formed on the electrode active material layer. Since the pattern formed on the rolled member is matched with the pattern formed on the electrode active material layer, a uniform pressure may be applied to the pattern portion and the non-pattern portion on the surface of the electrode active material layer. By applying a uniform pressure to the pattern portion and the non-pattern portion in this manner, the electrode active material layer can exhibit even porosity distribution over the entire surface.

A third aspect of the present invention relates to an electrode assembly for an electrochemical device. The electrode assembly is stacked with electrode(s) having opposite polarities through a separator, and may include one or more electrodes according to the present invention having the above-described characteristics. 7 is a schematic diagram of an electrode assembly according to an embodiment of the present invention. Referring to this, since a groove-shaped concave pattern is formed in the electrode active material layer, the separator is in close contact with the non-patterned portion of the electrode and not with the patterned portion. Accordingly, there is an effect of improving electrolyte impregnation efficiency of the electrode assembly by promoting electrolyte movement through the pattern portion opened to the outside.

In addition, in order to maximize the electrolyte impregnation efficiency when the electrode assembly according to the present invention is applied to electrode manufacturing, it is preferable that the electrolyte injection direction (c) coincides with the opening portion of the pattern as shown in 8 when injecting the electrolyte. .

Finally, a fourth aspect of the present invention relates to a method of manufacturing an electrode assembly according to the present invention. In a method for manufacturing an electrode assembly according to a specific embodiment of the present invention, an electrode and a separator are stacked so that a separator is interposed between opposite electrodes to produce a laminate, and the laminate passes between a pair of lamination rolls to perform a rolling process. Perform. At this time, at least one electrode included in the electrode assembly is according to the present invention, and a pattern portion is formed on the surface of the electrode active material layer. In addition, a pattern corresponding to the pattern portion of the electrode active material layer is formed on the surface of the lamination roll so that only the surface of the separator and the non-pattern portion of the electrode are in close contact with each other during rolling.

9 is a schematic view showing a method of manufacturing an electrode assembly according to the present invention. Referring to this, a separator is interposed between two electrodes provided with a pattern part to form a laminate, and the laminate is rolled while passing through a pair of lamination rolls to form an electrode assembly.

In a specific embodiment of the present invention, a pattern corresponding to the pattern portion of the electrode may be formed on the surface of the lamination roll. By doing this, only the non-patterned portion of the electrode is pressed during rolling, and only the non-patterned portion is in close contact with the separator.

In the present invention, the binder may be a thermoplastic resin or a thermosetting resin, or may be used in combination. Among these, polyvinylidene fluoride (PVdF) or polytetrafluoroethylene (PTFE) is preferable.

The conductive material may be any electronically conductive material that does not cause chemical changes in the configured battery. Carbon black, such as acetylene black, Ketjen black, Parnes black, and thermal black, for example; Natural graphite, artificial graphite, conductive carbon fiber, etc. can be used, and carbon black, graphite powder, and carbon fiber are particularly preferred.

In addition, isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, and the like may be used as the dispersion medium.

In the present invention, the separator is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 µm, and the thickness is generally 5 to 300 µm. Examples of such separation membranes include olefin-based polymers such as polypropylene having chemical resistance and hydrophobicity; Sheets or non-woven fabrics made of glass fiber or polyethylene are used.

In a specific embodiment of the present invention, the negative active material includes a carbon material. Both low crystalline carbon and high crystalline carbon may be used as the carbon material. Typical low crystalline carbons include soft carbon and hard carbon, and high crystalline carbons include natural graphite, artificial graphite, kish graphite, pyrolytic carbon, and liquid crystal pitch. High-temperature calcined carbon such as mesophase pitch based carbon fiber, meso-carbon microbeads, mesophase pitches, and petroleum or coal tar pitch derived cokes are typical.

In a specific embodiment of the present invention, the positive electrode may include a lithium-containing transition metal oxide. The lithium-containing transition metal oxide is, for example, LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , Li(Ni _a Co _b Mn _C )O ₂(0<a<1, 0<b<1, 0<c<1, a+b+c=1), LiNi _{1 - y} Co _y O ₂ , LiCo _1-y Mn _y O ₂ , LiNi _{1 - y} Mn _y O ₂ (O=y=1), Li(Ni _a Mn _b Co _c )O ₄(0<a<2, 0<b<2, 0<c<2, a+b+c=2), LiMn _2-z Ni _z O ₄ , LiMn _{2 - z} Co _z O ₄Any one selected from the group consisting of (O<z<2), LiCoPO ₄ and LiFePO ₄ , or a mixture of two or more of them may be used. In addition, in addition to these oxides, sulfide, selenide, and halide may also be used.

In addition, the present invention provides an electrochemical device including an electrode and/or an electrode assembly according to the present invention. In a specific embodiment of the present invention, the electrochemical device is preferably a lithium secondary battery.

Meanwhile, in the description of the electrode and/or electrode assembly in the present invention, a conventional material or method used in the technical field to which the present invention pertains may be applied to contents not described in the present specification.

Hereinafter, examples will be described in detail to illustrate the present invention in detail. However, the embodiments according to the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art.

Example

Manufacturing example One

LiNi _{0 . 5} Mn _{0 . 3} Co _{0 . 2} O ₂ , polyvinylidene fluoride and carbon black were mixed with N-methylpyrrolidone in a weight ratio of 96:2:2 to prepare a positive electrode slurry. The positive electrode slurry was coated on an aluminum thin film to a thickness of 60 μm to form a thin electrode plate and then dried at 135° C. for 3 hours or more.

Manufacturing example 2

Artificial graphite, Super-P, CMC, and SBR were mixed with N-methylpyrrolidone in a weight ratio of 95.8:1:1.2:2 to prepare a negative electrode slurry. Next, the negative electrode slurry was coated on a copper foil with a thickness of 14 μm to form a thin electrode plate and dried at 135° C. for 3 hours or more.

Example

The electrode surfaces prepared in Preparation Example 1 were each laser etched. An IR laser (output up to 20W, speed up to 2500mm/s) was used, and laser etching conditions are shown in Table 1 below. After the electrode surface was etched, the electrode was manufactured by rolling with a roll press. The rolling conditions were 50 m/min and 10 MPa. In addition, the surface of the etched electrode is illustrated in FIGS. 10A to 10D.

electrode Laser etching conditions result Example 1 Manufacturing Example 1 2W, 2500mm/s See Figure 10a Example 2 Manufacturing Example 1 4W, 2500mm/s See Figure 10b Example 3 Manufacturing Example 2 2W, 2500mm/s See also `10c Example 4 Manufacturing Example 2 4W, 2500mm/s See also `10d

Example 5: Etching Different experimental results on speed

Laser etching was performed on the electrodes prepared in Preparation Example 1 and Preparation Example 2 at different speeds, and the results are shown in FIG. 11. For reference, the drawings of each anode and cathode shown in FIG. 11 are rear surfaces of the electrode on which laser etching has been performed. According to this, in the case of the anode manufactured in Preparation Example 1, furrows were well formed by etching up to 110 mm/s under 20W condition, but when it exceeds 110 mm/s (in the case of 120 mm/s or more according to the experiment), laser irradiation at the same point As the time increased, etching proceeded excessively, resulting in cutting of the electrode.

In addition, in the case of the cathode, furrows were well formed by etching up to 90 mm/s under the condition of 20 W, but when exceeding 1000 mm/s (in the case of 170 mm/s or more according to the experiment), the electrode was cut for the same reason as described above. As such, the laser etching condition may be selected in an appropriate range in consideration of various conditions such as the type of electrode, the type of active material included in the electrode, and laser output.

Example 6: Etching Experimental results different in shape

For the electrode of Preparation Example 1, a square pattern having a predetermined area at 20 W and 160 mm/s was formed. 12B is an enlarged view of portion A of FIG. 12A, and it was confirmed that the pattern portion and the non-pattern portion formed a clear boundary.

Claims (12)

It is a method of manufacturing an electrode for an electrochemical device,
The electrode is an electrode current collector; And
And an electrode active material layer formed on at least one side of the electrode current collector,
The electrode active material layer includes a pattern portion in which a concave pattern is formed on a surface and a non-pattern portion in which the pattern is not formed,
The above method,
(S1) applying a slurry for forming an electrode active material on at least one surface of the electrode current collector;
(S2) drying the slurry;
(S3) forming a pattern portion having a concave pattern on the surface of the dried slurry; And
(S4) rolling the electrode active material layer on which the pattern portion is formed; includes,
The (S3) is performed by a method of laser etching,
The rolling is to make the difference between the porosity of the pattern portion and the non-pattern portion within 20%, the method of manufacturing an electrode for an electrochemical device.
The method of claim 1,
The pattern portion includes a pattern in the form of a furrow, wherein at least one furrow is formed on the surface of the electrode active material layer, and the furrow has at least one end connected to the edge of the electrode active material layer. A method of manufacturing an electrode for a chemical device.
The method of claim 2,
Any one furrow formed on the surface of the electrode active material layer crosses or does not cross the other furrow.
The method of claim 1,
A method of manufacturing an electrode for an electrochemical device, wherein the area of the pattern portion is 1% to 10% relative to 100% of the surface area of the electrode active material layer. delete delete delete delete delete delete delete delete

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