KR20230114083A - Secondary battery and manufacturing method of the same - Google Patents

Abstract

A secondary battery according to an embodiment of the present invention includes a current collector and an electrode formed of a plurality of coating patterns made of different materials on one surface of the current collector. According to one embodiment of the present invention, there is an effect of effectively increasing the degree of freedom in design by manufacturing various shapes and irregular shapes of electrodes of a secondary battery.

Description

Secondary battery and manufacturing method of the same {Secondary battery and manufacturing method of the same}

One embodiment of the present invention relates to a secondary battery and a manufacturing method thereof.

In general, a secondary battery is a battery that can be used repeatedly through a process of discharging and charging in the reverse direction of converting chemical energy into electrical energy. Batteries, lithium-metal batteries, lithium-ion (Ni-Ion) batteries and lithium-ion polymer batteries (Li-Ion Polymer Battery, hereinafter referred to as "LIPB") and the like.

A secondary battery is composed of an anode, a cathode, an electrolyte, and a separator, and stores and generates electricity using a voltage difference between different anode and cathode materials. Here, discharging is to move electrons from a cathode with a higher voltage to an anode with a lower voltage (electricity is generated as much as the voltage difference between the anodes), and charging is to move electrons from the anode to the cathode again. At this time, the anode material receives electrons and lithium ions. to return to the original metal oxide. That is, when the secondary battery is charged, a charging current flows as metal atoms move from the positive electrode to the negative electrode through the separator, and conversely, when the secondary battery is discharged, the metal atoms move from the negative electrode to the positive electrode, and a discharge current flows.

Recently, secondary batteries have been widely used in IT products, automobile fields, energy storage fields, etc., and are attracting attention as an energy source in the spotlight. In the field of IT products, secondary batteries can be used continuously for a long time, and miniaturization and light weight are required. In the field of automobiles, high power, durability, and stability to eliminate the risk of explosion are required. The energy storage field is to store surplus power produced by wind power, solar power, etc., and as it is used in a fixed type, secondary batteries with more relaxed conditions can be applied.

However, in the process of manufacturing secondary battery electrodes, there were limitations in designing electrode shapes suitable for various environments and devices, such as the freedom of shape design due to the use of molds according to electrode shapes and limitations in manufacturing atypical electrode shapes.

KR 2014-0142576 A

An object according to an embodiment of the present invention is to provide a secondary battery and a manufacturing method thereof capable of providing a secondary battery optimized for more diverse environments and devices by effectively improving the degree of freedom in designing a secondary battery electrode shape.

In addition, it is to provide a secondary battery having more diverse characteristics and shapes and a manufacturing method thereof through the manufacture of electrodes using heterogeneous slurries of secondary battery electrodes and the manufacture of electrodes in which heterogeneous slurries and various patterns are combined.

A secondary battery according to an embodiment of the present invention includes a current collector and an electrode formed of a plurality of coating patterns made of different materials on one surface of the current collector.

Here, the plurality of coating patterns may be formed in areas that do not overlap each other on the same plane on the current collector.

In addition, the plurality of coating patterns may be formed of a plurality of slurries each having different characteristics and may be formed on the same plane in a non-overlapping region.

In addition, the coating pattern of the different materials includes a first coating pattern by a first slurry and a second coating pattern by a second slurry having different characteristics, and the first coating pattern is coated on the edge of the current collector The second coating pattern may be coated on the same plane of the inner region of the current collector rim that does not overlap with the first coating pattern.

In addition, the coating pattern formed on the current collector may be laminated to the same thickness on one surface of the current collector.

A method for manufacturing a secondary battery according to an embodiment of the present invention includes preparing a current collector, laminating a guide film having a predetermined pattern on the current collector, coating a slurry on the guide film, and Drying the coated slurry and removing the guide film to prepare an electrode having a coating layer having a predetermined coating pattern formed on the current collector.

Here, after removing the guide film, a step of manufacturing an electrode having a predetermined coating pattern through a slitting step may be further included.

In addition, the guide film may be formed of polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), poly(trimethylene terephthalate) (PTT), or a combination of these materials. .

A method for manufacturing a secondary battery according to another embodiment of the present invention includes preparing a current collector, laminating a first guide film having a first coating pattern on one surface of the current collector, and forming a first guide film on the first guide film. Coating a first coating pattern with 1 slurry, drying the coated first slurry to form a coating layer of a first coating pattern, removing the first guide film, removing the first guide film on one surface of the current collector Laminating a second guide film having a second coating pattern that does not overlap with the coating pattern, coating a second coating pattern with a second slurry on the second guide film, drying the second slurry to form a second Forming a coating layer of a coating pattern and removing the second guide film to prepare an electrode including a coating layer on which the first coating pattern and the second coating pattern are formed on the current collector.

Here, the first slurry and the second slurry may be formed of different materials having different characteristics.

In addition, the first coating pattern of the first guide film is formed to a predetermined thickness along the edge of the current collector, and the second coating pattern of the second guide film does not overlap with the first coating pattern. It may be formed to include the inner region of the first coating pattern.

In addition, the guide film may be formed of polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), poly(trimethylene terephthalate) (PTT), or a combination of these materials. .

Features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be interpreted in a conventional and dictionary sense, and the inventor should properly define the concept of the term in order to explain his or her 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.

According to one embodiment of the present invention, there is an effect of effectively increasing the degree of freedom in design by manufacturing various shapes and irregular shapes of electrodes of a secondary battery.

In addition, by effectively combining heterogeneous slurries having various characteristics in consideration of characteristics of secondary battery electrodes and heterogeneous patterns, there is an effect of securing reliability in performance and operation of secondary battery electrodes.

In addition, there is an effect that can effectively improve the characteristics of the secondary battery by patterning each type of slurry according to various shapes of the same plane of the secondary battery.

In addition, by applying the guide film on the secondary battery manufacturing method, there is an effect that can effectively improve the degree of freedom in designing specifications of the secondary battery by manufacturing electrodes of various specifications.

1 is a plan view of a secondary battery according to an embodiment of the present invention and a cross-sectional view along marked lines;
2 is a plan view of a secondary battery according to a modified example of an embodiment of the present invention and a cross-sectional view along marked lines;
3 is a plan view and a cross-sectional view of a step of preparing a current collector in a manufacturing process of a secondary battery according to an embodiment of the present invention and a cross-sectional view along a marked line
4 is a plan view of a step of laminating a guide film on a current collector in a manufacturing process of a secondary battery according to an embodiment of the present invention and a cross-sectional view taken along marked lines.
Figure 5 is a manufacturing process according to an embodiment of the present invention, a surface plan view and cross-sectional view of the step of applying and drying the slurry on a guide film and marked lines
6 is a plan view of a step of forming a coating layer having a coating pattern by removing a guide film in a manufacturing process of a secondary battery according to an embodiment of the present invention and a cross-sectional view taken along a marked line.
7 is a plan view of a step of manufacturing a secondary battery including an electrode having a coating pattern in a manufacturing process of a secondary battery according to an embodiment of the present invention.
8 is a plan view and a cross-sectional view of a step of preparing a current collector in a manufacturing process of a secondary battery according to another embodiment of the present invention and a cross-sectional view along a marked line
9 is a plan view and cross-sectional view of a step of laminating a first guide film on a current collector in a manufacturing process of a secondary battery according to another embodiment of the present invention and a cross-sectional view along marked lines.
10 is a plan view and a cross-sectional view of a step of applying and drying a first slurry on a first guide film in a manufacturing process of a secondary battery according to another embodiment of the present invention and by marked lines;
11 is a plan view of a step of forming a coating layer having a first coating pattern by removing a first guide film in a manufacturing process of a secondary battery according to another embodiment of the present invention and a cross-sectional view taken along a line
12 is a plan view and a cross-sectional view of a step of laminating a second guide film on a current collector in a manufacturing process of a secondary battery according to another embodiment of the present invention and a cross-sectional view along marked lines.
13 is a plan view and cross-sectional view of a step of applying and drying 2 slurries on a second guide film in a manufacturing process of a secondary battery according to another embodiment of the present invention, and a cross-sectional view taken along a marked line
14 is a plan view of a step of forming a coating layer having a second coating pattern by removing a second guide film in a manufacturing process of a secondary battery according to another embodiment of the present invention and a cross-sectional view taken along a line
15 is a plan view of a step of manufacturing a secondary battery including an electrode having a first coating pattern and a second coating pattern, in a manufacturing process of a secondary battery according to another embodiment of the present invention.

Objects of the invention, certain advantages and novel features will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible even if they are displayed on different drawings. In addition, terms such as "one side", "other side", "first", and "second" are used to distinguish one component from another, and the components are not limited by the above terms. no. Hereinafter, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, and like reference numerals denote like members.

1 is a plan view and a cross-sectional view along the indicated lines of a secondary battery according to an embodiment of the present invention, and FIG. 2 is a plan view and cross-sectional view taken along the indicated lines of a secondary battery according to a modified example of an embodiment of the present invention.

A secondary battery according to an embodiment of the present invention includes a current collector 10 and an electrode formed of a plurality of coating patterns 31 made of different materials on one surface of the current collector 10 .

The current collector 10 is an important component in manufacturing a secondary battery, and serves as a passage through which electrons are transferred from the outside so that an electrochemical reaction occurs in the active material, or electrons are received from the active material and passed to the outside. In a lithium secondary battery, an aluminum (Al) current collector 10 may be used as an anode and a copper (Cu) current collector 10 as an anode.

As shown in FIG. 1 , a secondary battery according to an embodiment of the present invention includes a plurality of coating patterns 31 made of different materials on a current collector 10 .

Specifically, the first coating pattern 31a of the edge region of the electrode unit and the second coating pattern 31b of the remaining inner region that does not overlap with the first coating pattern 31a may be formed, respectively. In this case, electrode specifications can be effectively adjusted by applying different types of materials to each of the first coating pattern 31a and the second coating pattern 31b.

For example, in a harsh environment such as low-temperature charging or rapid charging, a load receiving current may be different for each position within an electrode, which may cause local precipitation in the electrode. When such localized precipitation intensifies, damage is applied to the separator at the corresponding portion, which may lead to an internal electrical short. This can pose a serious threat to serious performance degradation and stability of the secondary battery in the long run.

That is, in order to overcome this problem, an electrode may be formed by applying a different type of slurry 20 to one electrode.

In FIG. 1, artificial graphite, which is advantageous for rapid charging or low-temperature characteristics, is applied to the first slurry 21 of the first coating pattern 31a area of the electrode rim, and the second coating pattern 31b area of the inner area of the rim This is a case in which high-capacity artificial graphite is applied to the second slurry 22 . When an electrode is manufactured with the combination of the slurry 20, there is an advantage in that precipitation does not occur on the front surface of the negative electrode.

Here, the plurality of coating patterns 31, the first coating pattern 31a and the second coating pattern 31b are formed to a uniform thickness on the current collector 10, thereby maintaining consistent characteristics of electrode performance and function. may be more effective.

type of slurry electrode pattern composition cell disassembly result comparative example 1 kind of slurry Example first slurry second slurry

As shown in Table 1 above, the comparative example in which the electrode was manufactured with one type of slurry 20 and the outer edge area and inner area of the heterogeneous slurry 20 of the first slurry 21 and the second slurry 22 Electrodes were formed to form a pattern, and a total of 10 cycles were performed at -5° C. for charging at a maximum of 1 coulomb (C) and discharging at 0.33 coulomb (C). Thereafter, the battery cell 1 in a fully charged state was dismantled and the surface state of the negative electrode was confirmed.

As shown in Table 1 above, in Comparative Example, when the electrode was manufactured with a single slurry 20, the negative electrode was deposited in the form of an edge on the negative electrode. However, in the embodiment, as a result of applying the first slurry 21 of artificial graphite, which is advantageous for rapid charging or low-temperature characteristics, to the edge region of the electrode and the second slurry 22 of high-capacity artificial graphite to the inner region of the edge, It was confirmed that no peculiarities such as precipitation were found.

In this way, in the case of a secondary battery in which electrodes are manufactured by forming patterns in required regions through heterogeneous slurries 20, more effective performance is exhibited in electrode characteristics, and multi-function electrodes can be implemented. You can check.

In addition, as shown in FIG. 2 , it is possible to implement an irregular electrode shape and to combine a plurality of heterogeneous coating patterns 31 having an irregular electrode shape.

3 is a plan view and cross-sectional view of a step of preparing a current collector 10 in a manufacturing process of a secondary battery according to an embodiment of the present invention and FIG. 4 is a manufacturing process of a secondary battery according to an embodiment of the present invention As a process, a plan view and cross-sectional view of the step of laminating the guide film 30 on the current collector 10, Figure 5 is a manufacturing process according to an embodiment of the present invention, slurry on the guide film 30 6 is a plan view of the surface and a cross-sectional view of the step of applying and drying (20), FIG. 6 is a manufacturing process of a secondary battery according to an embodiment of the present invention, the coating pattern 31 is formed by removing the guide film 30 A plan view and a cross-sectional view of a step of forming a coating layer, and FIG. 7 is a manufacturing process of a secondary battery according to an embodiment of the present invention, in which a secondary battery including an electrode having a coating pattern 31 is manufactured. is a plan view of

In one embodiment of the present invention, a method for manufacturing a secondary battery includes preparing a current collector 10, laminating a guide film 30 having a predetermined coating pattern 31 on the current collector 10, Coating the slurry 20 on the guide film 30, drying the coated slurry 20, and removing the guide film 30 to form a predetermined coating pattern on the current collector 10 ( 31) to prepare the electrode on which the coating layer is formed.

First, as shown in FIG. 3 , it is a step of preparing the current collector 10 . The current collector 10 has the same configuration as described above in the secondary battery according to an embodiment of the present invention, is a conductor having low electrical resistance, and is configured to transfer current to or from the active material during charging and discharging. It becomes a basic base member in manufacturing an electrode of a secondary battery.

Next, as shown in FIG. 4 , a guide film 30 is stacked on the current collector 10 . The guide film 30 has a coating pattern 31 for the shape of the electrode, so it does not require various molds according to the specifications of the secondary battery, and it is possible to manufacture an effective electrode pattern only by simple deformation and change of the guide film 30. There are benefits to responding.

The guide film 30 includes a predetermined coating pattern 31, and this coating pattern 31 can be applied in various shapes to form a pattern desired by the user for the shape of the electrode.

It is appropriate for the guide film 30 to have strength and flexibility capable of maintaining a certain tension for winding and progressing the coating equipment. Thermal stability is required in the range of about 100 ° C to 150 ° C or more so that there is no deformation during drying of the slurry. The thickness can be appropriately selected and applied according to the loading amount of the slurry within the range of 50 μm to 150 μm.

Therefore, since the guide film 30 must secure properties such as chemical resistance, heat resistance and flexibility, polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), poly It would be appropriate to apply a film consisting of (trimethylene terephthalate) (PTT) or a combination of these materials. In addition, when higher heat resistance is required, application of a fluorine-based resin may be possible.

Next, as shown in FIG. 5, it is a step of applying the slurry 20 on the guide film 30. A coating layer of the required coating pattern 31 can be obtained by applying the slurry 20 and drying it.

Here, it is appropriate that the coating amount of the slurry 20 is applied to form a coating layer equal to the thickness of the guide film 30 .

When the range of the thickness of the slurry 20 to be applied is 50 μm to 150 μm, the thickness of the guide film 30 is designed to be the same as the thickness of the slurry 20, or at least the upper limit thickness tolerance is the thickness of the slurry 20 It may be formed thicker within the range of 5 μm to 15 μm, or the lower limit thickness tolerance may be formed with a lower thickness with a difference within the range of 5 μm or less compared to the thickness of the slurry 20. By forming the thickness of the upper and lower limits of the guide film 30 for forming the thickness of the slurry 20 within an error range, it is possible to effectively secure the reliability of secondary battery manufacturing.

When the thickness of the guide film 30 is out of the upper limit range, the thickness of the slurry 20 is formed to exceed the desired thickness, or when the thickness of the guide film 30 is out of the lower limit range, the thickness of the slurry 20 is less than the desired thickness because it is made of

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Next, as shown in FIG. 6, by removing the guide film 30, a coating layer corresponding to the predetermined coating pattern 31 formed on the guide film 30 is formed.

Finally, as shown in FIG. 7 , a secondary battery cell 1 including an electrode tab may be manufactured through a slitting step.

The current collector 10, the guide film 30, and the coating pattern 31 included in the secondary battery manufacturing method according to an embodiment of the present invention correspond to the secondary battery according to the above-described temporary embodiment of the present invention. Since the configuration is substantially the same, duplicate descriptions will be omitted.

8 is a plan view and cross-sectional view of a step of preparing a current collector 10 in a manufacturing process of a secondary battery according to another embodiment of the present invention, and FIG. 9 is a manufacturing process of a secondary battery according to another embodiment of the present invention. As a process, a plan view and cross-sectional view of the step of laminating the first guide film 30a on the current collector 10, and FIG. 10 is a manufacturing process of a secondary battery according to another embodiment of the present invention, a first guide 11 is a plan view and cross-sectional view of a step of applying and drying the first slurry 21 on the film 30a, and FIG. 11 is a manufacturing process of a secondary battery according to another embodiment of the present invention, a first guide film ( 30a) is removed to form a coating layer on which the first coating pattern 31a is formed, and FIG. 12 is a plan view and a cross-sectional view along the marked line, and FIG. 12 is a manufacturing process of a secondary battery according to another embodiment of the present invention. 13 is a plan view and cross-sectional view of the step of laminating the second guide film 30b on the second guide film 30b, and FIG. 14 is a plan view and cross-sectional view of the step of applying and drying, and FIG. 14 is a manufacturing process of a secondary battery according to another embodiment of the present invention, the second coating pattern 31b is formed by removing the second guide film 30b. 15 is a plan view and a cross-sectional view of the step of forming the formed coating layer, and FIG. 15 is a manufacturing process of a secondary battery according to another embodiment of the present invention, in which the first coating pattern 31a and the second coating pattern 31b are formed. It is a plan view of a step in which a secondary battery including an electrode is manufactured.

A method for manufacturing a secondary battery according to another embodiment of the present invention includes preparing a current collector 10 and a first guide film 30a having a first coating pattern 31a formed on one surface of the current collector 10. Laminating step, coating the first coating pattern 31a with the first slurry 21 on the first guide film 30a, drying the coated first slurry 21 to obtain a first coating pattern ( Forming the coating layer of 31a), removing the first guide film 30a, forming a second coating pattern 31b that does not overlap with the first coating pattern 31a on one surface of the current collector 10 Laminating the formed second guide film 30b, coating the second coating pattern 31b with the second slurry 22 on the second guide film 30b, the coated second slurry 22 ) to form a coating layer of the second coating pattern 31b and removing the second guide film 30b to form the first coating pattern 31a and the second coating on the current collector 10 and manufacturing an electrode having a coating layer including the pattern 31b.

In a method for manufacturing a secondary battery according to another embodiment of the present invention, different coating patterns 31 are formed with the first guide film 30a and the second guide film 30b, but each coating pattern 31 is By applying different types of slurries 20 to areas that do not overlap on the entire 10, there is an advantage in that the degree of freedom in designing the shape of the secondary battery electrode can be increased and the electrode characteristics can be designed to be optimized.

Specifically, first, as shown in FIG. 8 , it is a step of preparing a current collector 10 for manufacturing an electrode of a secondary battery.

Next, as shown in FIG. 9 , it is a step of stacking the first guide film 30a having the first coating pattern 31a formed on one side of the current collector 10 . As shown, the first guide film 30a including some of the entire coating patterns 31 to be formed on the current collector 10 is laminated.

Next, as shown in FIG. 10 , the first slurry 21 is applied and dried on the first guide film 30a. A coating layer by the first slurry 21 is first formed by applying the first slurry 21 to the first coating pattern 31a.

Next, as shown in FIG. 11 , when the first guide film 30a is removed, a first coating pattern 31a coated with the first slurry 21 is formed.

Next, as shown in FIG. 12, on the current collector 10 on which the first coating pattern 31a is formed, a second coating pattern (continuous or spaced apart) on an area that does not overlap with the first coating pattern 31a ( The second guide film 30b on which 31b) is formed is laminated. Of course, the second coating pattern 31b may be extended with the first coating pattern 31a to form a specific pattern shape, and may be formed as independent patterns at separate and spaced positions.

Next, as shown in FIG. 13, the second slurry 22 is applied and dried on the second guide film 30b. As the second slurry 22, a different kind of slurry 20 having characteristics different from that of the first slurry 21 coated on the first guide film 30a may be applied.

As shown in Table 1 of the secondary battery according to an embodiment of the present invention, in order to form a specific pattern with the slurries 20 having different characteristics, through the second coating pattern 31b of the second guide film 30b A secondary battery having such an electrode shape can be manufactured.

Here, the second guide film 30b is laminated on the first coating pattern 31a already formed to a predetermined thickness, so that the second coating pattern 31b has the same thickness as the first coating pattern 31a. 2 The amount of the slurry 22 can be adjusted, and the second guide film 30b has a thickness difference from the first guide film 30a, so that the first coating pattern 31a and the second coating pattern 31b are more effective A coating layer containing this may be formed.

In addition, in order to uniform the thickness of the pattern coated and dried with a different type of slurry, by performing a separate electrode rolling process after the coating and drying step of the different type of slurry, the target density and thickness of the electrode can be realized. Of course.

Next, as shown in FIG. 14, when the second guide film 30b is removed, the first coating pattern 31a and the second coating pattern 31b are formed on the surface of the current collector 10 in respective regions. An electrode formed together can be manufactured. The first coating pattern 31a and the second coating pattern 31b may be formed to have the same thickness, and in order to manufacture a coating layer having this thickness, the first guide film 30a and the second guide film 30b are formed as described above. ), or by properly controlling the loading amount of the slurry 20, this can be implemented, of course.

Finally, as shown in FIG. 15, a battery cell 1 including an electrode of a coating layer including an electrode tab and a first coating pattern 31a and a second coating pattern 31b may be manufactured. .

The manufacturing steps and related components including the current collector 10, the guide film 30, and the slurry 20 of the secondary battery manufacturing method according to another embodiment of the present invention are the secondary battery according to the above-described embodiment of the present invention Since it is substantially the same as the method of manufacturing a battery and a secondary battery, detailed descriptions of overlapping contents will be omitted.

Although the present invention has been described in detail through specific examples, this is for specifically explaining the present invention, and it is clear that modifications or improvements are possible by those skilled in the art within the technical spirit of the present invention. will say that Simple variations or modifications of the present invention all fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

1: battery cell
10: entire collector
20: slurry 21: first slurry
22: second slurry
30: guide film 30a: first guide film
30b: second guide film 31: coating pattern
31a: first coating pattern 31b: second coating pattern

Claims (12)

current collector; and
A secondary battery comprising an electrode formed of a plurality of coating patterns made of different materials on one surface of the current collector. The method of claim 1,
The plurality of coating patterns are formed in regions that do not overlap each other on the same plane on the current collector. The method of claim 1,
The plurality of coating patterns are formed of a plurality of slurries each having different characteristics and are formed on the same plane in an area that does not overlap with each other. The method of claim 1,
The coating pattern of the heterogeneous material is
It includes a first coating pattern by a first slurry and a second coating pattern by a second slurry having different characteristics,
The first coating pattern is coated on an edge of the current collector, and the second coating pattern is coated on the same plane of an inner region of an edge of the current collector that does not overlap with the first coating pattern. The method of claim 1,
The coating pattern formed on the current collector is
A secondary battery laminated to the same thickness on one surface of the current collector. Preparing the entire house;
laminating a guide film having a predetermined pattern on the current collector;
coating a slurry on the guide film;
drying the coated slurry; and
A method of manufacturing a secondary battery comprising the step of removing the guide film to manufacture an electrode having a coating layer having a predetermined coating pattern formed on the current collector. The method of claim 6,
After removing the guide film,
A method for manufacturing a secondary battery further comprising the step of manufacturing an electrode having a predetermined coating pattern through a slitting step. The method of claim 6,
The guide film is a secondary battery manufacturing method formed of polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), poly (trimethylene terephthalate) (PTT), or a combination of these materials. . Preparing the entire house;
laminating a first guide film having a first coating pattern on one surface of the current collector;
coating a first coating pattern with a first slurry on the first guide film;
drying the coated first slurry to form a coating layer of a first coating pattern;
removing the first guide film;
laminating a second guide film having a second coating pattern that does not overlap with the first coating pattern on one surface of the current collector;
coating a second coating pattern with a second slurry on the second guide film;
drying the second slurry to form a coating layer of a second coating pattern; and
A method of manufacturing a secondary battery comprising the step of removing the second guide film to manufacture an electrode including a coating layer on which the first coating pattern and the second coating pattern are formed on the current collector. The method of claim 9,
The method of manufacturing a secondary battery wherein the first slurry and the second slurry are formed of different materials having different characteristics. The method of claim 9,
The first coating pattern of the first guide film is formed to a predetermined thickness along the edge of the current collector,
The second coating pattern of the second guide film is formed to include an inner region of the first coating pattern so as not to overlap with the first coating pattern. The method of claim 9,
The first guide film or the second guide film may be made of polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), poly(trimethylene terephthalate) (PTT), or any of these materials. A method for manufacturing a secondary battery formed by the combination.