JP5609839B2 - Method for producing electrode plate for lithium ion secondary battery - Google Patents

Description

  The present invention relates to a technique of a manufacturing method of an electrode plate for a lithium ion secondary battery.

In recent years, in the field of automobiles, environmental and resource issues have been screamed, and electric vehicles and hybrid vehicles have been developed. High drive voltages and high energy densities have been used as drive power sources for these electric vehicles and hybrid vehicles. The demand for lithium ion secondary batteries is increasing.
Here, the electrode plate used for the lithium ion secondary battery is manufactured by applying a paste-like active material on both sides or one side of a metal foil mainly made of a strip-like aluminum foil.
Specifically, the paste-like active material is applied to both or one side of the metal foil (coating process), the active material applied to the metal foil is dried in a drying furnace (drying process), and then dried. The metal foil is rolled together with the active material (rolling process). Then, the rolled metal foil is cut (slit) into a predetermined length together with the active material (slit process: see, for example, “Patent Document 1”), and an electrode plate is manufactured.

By the way, in the whole coating equipment of the electrode plate for lithium ion secondary batteries constituted by such a process group (coating process / drying process / rolling process / slit process), when reducing the equipment cost, It is important to increase the drying speed of the active material in the drying process as much as possible.
Specifically, the active material drying operation in the drying process is performed by transporting a metal foil coated with a paste-like active material in the longitudinal direction of the metal foil in a drying furnace provided in the coating equipment. Therefore, if the drying speed of the active material is increased, the residence time of the metal foil in the drying furnace can be shortened accordingly, and the overall length of the drying furnace can be shortened, and the coating having the drying furnace The equipment cost of the equipment can be reduced.

JP 2010-238490 A

Here, in order to increase the drying speed of the active material in the drying step, it is easiest to increase the furnace temperature of the drying furnace as much as possible as compared with the conventional furnace temperature.
However, in order to increase the binding strength with the metal foil, the active material contains a binder in advance. If the furnace temperature is higher than before, the vicinity of the surface of the paste-like active material The ratio of the binder that floats to the surface increases, the amount of the binder present between the active material and the metal foil decreases, and the binding strength between the active material and the metal foil decreases.
Thus, in the slitting process for cutting the metal foil coated with the active material, which is performed after the drying process is finished, the active material bound near the cutting portion slides down from the metal foil, and the completed electrode plate It can be a factor causing quality deterioration.
On the other hand, if the amount of the binder contained in the active material is increased as compared with the conventional one, the binding strength between the active material and the metal foil is increased, and the sliding off of the active material from the metal foil is prevented. It is possible.
However, since the binder has non-conductivity, the electrical resistance of the completed electrode plate increases as the amount of the binder increases, which causes deterioration of the quality of the electrode plate. obtain.

The present invention has been made in view of the present problems as described above, and the problem is that a paste-like active material containing a binder on both sides or one side of a belt-like metal foil A coating step for applying the active material, a drying step for drying the active material by a drying furnace, and a drying step for drying the active material after the drying step. A lithium ion secondary battery comprising: a rolling step for rolling; and a slit step for cutting the rolled active material and metal foil into a predetermined length after the rolling step is finished. A method for manufacturing an electrode plate, wherein the electrode plate can be cut to a predetermined length while preventing the active material from slipping in the slit process, and an increase in electrical resistance of the completed electrode plate can be suppressed. Possible, lithium It is to provide a method for manufacturing ion secondary battery electrode plate.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, according to the first aspect of the present invention, the coating step is performed after applying the paste-like active material containing the binder on both sides or one side of the strip-shaped metal foil, and after the end of the coating step. A drying step for drying the material, a rolling step performed after the drying step and rolling the metal foil together with the dried active material, and the active material and metal rolled after the rolling step And a slitting process for cutting the foil into a predetermined width dimension, the manufacturing method of the electrode plate for lithium ion secondary battery, the manufacturing method is performed before the application process A pre-coating step, and the pre-coating step is performed along a cutting portion scheduled to be cut by the slit step on a plane on which the application of the paste-like active material is planned by the coating step. Arrival The pre-coating, the width of the binder is pre-coated in the precoat step, if not performing the pre-coat process, based on the range of sliding area of the active material generated in the slitting step It is prescribed .

As effects of the present invention, the following effects can be obtained.
That is, according to the method for producing an electrode plate for a lithium ion secondary battery in the present invention, the electrode plate can be cut to a predetermined length while preventing the active material from slipping in the slit process, and the completed electrode. An increase in electrical resistance of the plate can be suppressed.

It is the figure which showed the manufacturing method of the electrode plate for lithium ion secondary batteries based on one Example of this invention, Comprising: (a) is the process drawing, (b) is from arrow X in FIG. 1 (a). A sectional view of the electrode plate as seen. It is the figure which showed the manufacturing method of the electrode plate for lithium ion secondary batteries based on one Example of the former, Comprising: (a) is the process drawing, (b) is seen from the arrow Y in Fig.2 (a). Sectional drawing of the electrode plate for batteries. Similarly, it is the figure which showed the manufacturing method of the electrode plate for lithium ion secondary batteries based on another conventional example, Comprising: (a) is the process drawing, (b) is the arrow Z in FIG. 3 (a). Sectional drawing of the electrode plate seen from. It is the figure which showed the measurement result regarding each quality in the electrode plate manufactured by the manufacturing method of a present Example, and the battery electrode plate manufactured by the conventional manufacturing method, (a) is related with a sliding width dimension. The figure which showed the measurement result with the dot, (b) is the figure which showed the measurement result regarding resistance value with the bar graph.

  Next, embodiments of the invention will be described.

[Lithium ion secondary battery]
First, the overall configuration of a lithium ion secondary battery including the electrode plate 1 for a lithium ion secondary battery manufactured by the electrode plate manufacturing process S100 of the present embodiment will be outlined with reference to FIG.
In the following description, for the sake of convenience, the direction of arrow A in FIG.

A lithium ion secondary battery is used as a drive power source for an electric vehicle or a hybrid vehicle, for example, and is mainly configured as a cylindrical battery or a square battery including an electrode body and a battery case (not shown). The
Specifically, the electrode body is charged with a sheet-like electrode plate 1 charged with a positive electrode (hereinafter referred to as “positive electrode plate 1A” only when it is particularly necessary to distinguish) or a negative electrode. Sheet-like electrode plate 1 (hereinafter referred to as “negative electrode plate 1B” only when it is particularly necessary to distinguish), a sheet-like separator (not shown) made of an insulating member, etc. Composed.

  The plurality of positive electrode plates 1A, 1A,... And negative electrode plates 1B, 1B, which have been cut into a predetermined shape in advance, are alternately stacked via separators, so that the electrode body is It is formed. Moreover, a lithium ion secondary battery is comprised by accommodating the wound electrode body in the inside of the battery case satisfy | filled with the non-aqueous electrolyte.

The positive electrode plate 1A has a paste-like active material 12 charged to the positive electrode on both or one side of a strip-like base material 11 made of a metal foil such as an aluminum foil (hereinafter, only when there is a need to particularly distinguish “ It is formed by coating a positive electrode active material 12A ”.
The positive electrode active material 12A is a material that can occlude and desorb lithium ions, and is formed and formed in a paste form together with the binder 13 (see FIG. 1B) and the like.

The negative electrode plate 1B has a paste-like active material 12 charged on the negative electrode on both sides or one side of the substrate 11 (hereinafter referred to as “negative electrode active material 12B” only when it is particularly necessary to distinguish). It is formed by coating.
Note that the negative electrode active material 12B is a material that has the property of occluding and discharging lithium ion when it is charged, and is formed in a paste form together with the binder 13 and the like. The

The binder 13 plays a role of connecting the positive electrode active material 12 </ b> A and the negative electrode active material 12 </ b> B to the base material 11. For example, a thermoplastic resin such as polypropylene can be used.
Since the binder 13 has non-conductivity, if the content of the binder 13 is increased, the binding strength between the positive electrode active material 12A or the negative electrode active material 12B and the base material 11 is increased. Therefore, the electrical conductivity of the positive electrode plate 1A and the negative electrode plate 1B is lowered.

The separator is for electrically insulating the positive electrode plate 1A and the negative electrode plate 1B, and for holding the nonaqueous electrolytic solution through innumerable fine holes formed on the surface.
In addition, as a material which comprises a separator, porous membranes, such as a porous synthetic resin film, especially polyolefin polymer (polyethylene, polypropylene), are mentioned, for example.

  The positive electrode plate 1A and the negative electrode plate 1B having such a configuration are overlapped or wound via a separator to form an electrode body, and the positive electrode communicated to the outside from the positive electrode plate 1A and the negative electrode plate 1B The terminal and the negative electrode terminal are connected by current collecting lead wires, and the positive electrode plate 1A and the negative electrode plate 1B are filled with a nonaqueous electrolytic solution, and the electrode body is placed in the battery case. The lithium ion secondary battery is configured by being inserted and sealed.

[Electrode plate manufacturing process S100]
Next, the configuration of the electrode plate manufacturing step S100 that embodies the method for manufacturing the electrode plate for a lithium ion secondary battery according to the present invention will be described with reference to FIGS.
In the following description, for the sake of convenience, the direction of arrow A in FIGS. 2 and 3 is described as the conveyance direction of the base materials 211 and 311.

As shown in FIG. 1, the electrode plate manufacturing process S100 mainly includes a pre-coating process S101, a coating process S102, a drying process S103, a rolling process S104, a slit process S105, and the like.
In the pre-coating step S101, a paste-like binder 13 (hereinafter referred to as the active material 12) is formed on a part of the base material 11 on which the active material 12 is to be applied in the coating step S102 described later. In order to distinguish it from the binder 13 contained, it is a step for applying in advance “described as a paste-like binder 13A”.
In the present embodiment, the binder 13 applied in the precoating step S101 is in the form of a paste. However, the present invention is not limited to this, and may be in a liquid form, for example.

  In the pre-coating step S101, for example, a known unwinding device (not shown) is provided, and the base material 11 wound in a roll shape by the unwinding device is directed in the longitudinal direction of the base material 11. Then, the sheet is conveyed while being fed, and then wound again in a roll shape at the downstream end in the conveying direction (the direction of arrow A in FIG. 1; the same applies hereinafter).

Further, an application means (not shown) such as a brush is provided in the upstream portion in the conveyance direction of the rewinding device, and the paste binder 13A is conveyed by the application means to the substrate 11 to be conveyed. Coating is performed on a part of both sides or one side (one side in the present embodiment) with a constant width dimension (width dimension b in FIG. 1A).
As will be described later, the width dimension b is defined based on the generation range of the sliding region 220 in the electrode plate 201 manufactured by the conventional electrode plate manufacturing step S200.

Here, the application position of the paste-like binder 13A on the plane of the base material 11 is defined based on the cutting position of the electrode plate 1 (more specifically, the base material 11) in the slit process S105 described later. The
Specifically, the cut part of the electrode plate 1 by the slit process S105 is assumed to be at the position of the imaginary line C on the plane of the base material 11 in the precoat process S101. And the paste-like binder 13A is coated on the surface of the base material 11 along the virtual line C.

Next, the coating process S102 will be described.
The coating process S <b> 102 is a process performed after the pre-coating process S <b> 101 is completed, and is a process for coating the paste-like active material 12 over substantially the entire surface of the substrate 11.

  In the coating step S102, for example, a known first transport device (not shown) for transporting a strip-shaped thin plate, or a known discharge device disposed upstream in the transport direction of the first transport device (Not shown) is provided. In addition, a drying furnace of a drying step S103 described later is disposed on the downstream side in the transport direction of the first transport device.

  And the base material 11 wound by roll shape is conveyed toward the longitudinal direction of this base material 11 by said 1st conveying apparatus, and is conveyed, and the paste-form binder 13A is carried out by the said discharge apparatus on the way. After the active material 12 is coated on the coated plane, it is carried into the drying furnace.

  As a result, on the plane of the substrate 11, in the vicinity of the imaginary line C, that is, where the paste-like binder 13 </ b> A is applied, the paste-like active material 12 is further “overcoated”. In the vicinity of the imaginary line C in the active material 12, the content density of the binder 13 is increased.

Next, the drying step S103 will be described.
The drying step S103 is a step performed after the end of the coating step S102, and the pasty active material 12 applied to the base material 11 is dried, so that the active material 12 is fixed to the base material 11. This is a process to make it solid.

  In the drying step S103, for example, a known long drying furnace (not shown) is provided, and as described above, the drying step S103 is arranged in the downstream portion in the transport direction of the first transport device provided in the coating step S102. Established.

  Then, the substrate 11 conveyed from the coating step S102 is carried into the drying furnace, and then heated in the atmosphere in the high temperature furnace while being conveyed in the longitudinal direction of the drying furnace. The paste-like active material 12 applied to the material 11 is dried, and the base material 11 after the drying operation is taken out of the drying furnace by the first conveying device, and wound into a roll again. It is done.

Next, rolling process S104 is demonstrated.
Rolling process S104 is a process performed after completion | finish of drying process S103, Comprising: A pressing force is applied to the dried active material 12, and it is a process for raising the density of this active material 12. FIG.

  In the rolling step S104, for example, two adjacent known rolling rollers (not shown), a known second conveying device (not shown) for conveying a strip-shaped thin plate, and the like are provided. The base material 11 wound in a roll shape is transported while being fed out in the longitudinal direction of the base material 11 by the second transport device, and after passing through the gap between the two rolling rollers, It is wound again into a roll at the downstream end.

  As a result, when the base material 11 passes through the gap between the rolling rollers, the active material 12 is pressed together with the base material 11 by the rolling roller, and the density of the active material 12 is increased.

Next, the slitting process S105 will be described.
The slitting step S105 is a step performed after the end of the rolling step S104, and is a step for cutting the base material 11 after the pressing operation of the active material 12 into a predetermined width dimension.

In the slitting step S105, for example, a known cutting device (not shown) having two disk-shaped rotary blades, a known third conveying device (not shown) for conveying a strip-shaped thin plate, or the like is used. Provided.
The two rotary blades are provided in the cutting device such that the blade portions formed at the edges overlap with each other while the rotation axes are parallel to each other.
Further, the cutting device is configured such that, on the downstream side in the transport direction of the third transport device, the base material 11 transported by the third transport device and the two rotary blades intersect at the overlap portion. Arranged. At this time, a location that intersects the overlap portion of the two rotary blades on the plane of the base material 11 is set to be on the imaginary line C described above.

And the base material 11 wound by roll shape is conveyed while being extended | stretched toward the longitudinal direction of this base material 11 with a 3rd conveying apparatus, and cross | intersects the overlap part of the said 2 rotary blades on the way. However, after being cut into a predetermined predetermined width dimension, each is wound in a roll shape at the downstream end in the transport direction.
Thus, when the slitting step S105 is completed, the electrode plate manufacturing step S100 is completed, and the electrode plate 1 is completed as a product.

By the way, in the whole coating equipment of the electrode plate 1 for a lithium ion secondary battery as described above, in order to reduce the equipment cost, the drying speed of the paste-like active material 12 in the drying step S103 is made as fast as possible. It is most effective and important to increase the drying speed.
This is because, if the drying speed of the active material 12 is increased, the residence time of the base material 11 in the drying furnace can be shortened accordingly, so that the overall length of the drying furnace can be shortened, and the coating having the drying furnace This is because the facility cost of the facility can be greatly reduced.

Here, as a means for increasing the drying speed, it is easiest and economical to increase the temperature in the drying furnace as much as possible without any other modification of equipment.
However, in the conventional electrode plate manufacturing processes S200 and S300 (see FIGS. 3 and 4), it is not possible to sufficiently cope with such an increase in the drying speed, and the equipment cost of the entire coating equipment is reduced. It was difficult to plan.

Specifically, as shown in FIG. 2A, the conventional electrode plate manufacturing process S200 mainly includes a coating process S201, a drying process S202, a rolling process S203, a slit process S204, and the like.
That is, the conventional electrode plate manufacturing process S200 is different from the electrode plate manufacturing process S100 in the present embodiment in that it does not include the pre-coating process S101.

  In the conventional electrode plate manufacturing process S200 having such a configuration, when the furnace temperature in the drying furnace in the drying process S202 is changed as much as possible as compared with the conventional case, as shown in FIG. Most of the binder 213 contained in the surface floats to the vicinity of the surface of the active material 212, so that the binding strength of the active material 212 to the base material 211 is weakened.

  As a result, as shown in FIG. 2A, when cutting the base material 211 after the pressing operation of the active material 212 in the slitting step S204, the cutting location (virtual line C on the plane of the base material 211) In the vicinity, a sliding region 220 of the active material 212 is generated, and the quality of the completed electrode plate 201 is deteriorated.

On the other hand, as a measure for preventing the occurrence of such a sliding region 220, a manufacturing method using an electrode plate manufacturing process S300 is conventionally known.
As shown in FIG. 3A, the electrode plate manufacturing process S300 is mainly configured by a coating process S301, a drying process S302, a rolling process S303, a slit process S304, and the like, similar to the electrode plate manufacturing process S200 described above. Is done.
Then, the electrode plate manufacturing step S300, as shown in FIG. 3 (b), in the present embodiment in that the amount of the binder 313 contained in the active material 312 is increased in advance compared to the conventional case. It differs from the electrode plate manufacturing process S100 and the electrode plate manufacturing process S200 described above.

  According to the conventional electrode plate manufacturing step S300 having such a configuration, the binding strength between the active material 312 and the base material 311 can be sufficiently increased, so that the occurrence of the sliding region 220 of the active material 312 is surely generated. Can be prevented.

However, as described above, since the binder 313 has non-conductivity, when the binder 313 is contained in the active material 312 beyond a predetermined content, the electric resistance of the completed electrode plate 301 is increased. Will rise.
Therefore, in the manufacturing method according to the electrode plate manufacturing process S300, another factor causing the deterioration of the quality of the electrode plate 301 can be induced, so that the problems in the conventional electrode plate manufacturing process S200 have not been completely overcome. .

  Therefore, various problems in the electrode plate manufacturing processes S200 and S300 described above are solved, and the overall cost of the coating equipment is reduced without causing deterioration of the quality of the manufactured electrode plate 1. Therefore, as a result of intensive studies by the present inventors, the electrode plate manufacturing step S100 in the present example was completed.

Specifically, as described above, in the electrode plate manufacturing process S100 in the present embodiment, a pre-coating process S101 that is performed before the execution of the coating process S102 is newly provided, and the pre-coating process S101 provides a subsequent slit process. The pasty binder 13A is preliminarily applied to the cut portion in S105 (virtual line C on the plane of the base material 11).
Further, at this time, the width dimension b of the paste-like binder 13A to be applied is the sliding width dimension (see FIG. 2A) of the sliding area 220 generated in the slit process S204 of the conventional electrode plate manufacturing process S200. It is defined to be slightly larger than the sliding width dimension (b1 + b2)) (b >> (b1 + b2)).

Therefore, according to the electrode plate manufacturing process S100 of the present embodiment, the content density of the binder 13 in the active material 12 in the vicinity of the imaginary line C of the base material 11 is sufficiently increased. The binding strength with the base material 11 becomes firm, and the occurrence of the sliding region 220 seen in the conventional electrode plate manufacturing step S200 can be effectively prevented.
Further, according to the electrode plate manufacturing process S100 of the present embodiment, the portion where the content density of the binder 13 in the active material 12 is increased is a region where the paste-like binder 13A is applied by the precoat process S101. Therefore, the electrical resistance of the completed electrode plate 1 does not increase as in the conventional electrode plate manufacturing step S300.

[Comparison verification experiment]
Next, regarding the quality of both the electrode plate 1 manufactured by the electrode plate manufacturing step S100 and the electrode plates 101 and 201 manufactured by the conventional electrode plate manufacturing steps S200 and S300 in the present embodiment, the present inventors. The comparative verification experiment conducted by will be described with reference to FIG.

First, in order to confirm the effectiveness of the anti-slip effect of the active material 12 in the electrode plate manufacturing step S100 of the present embodiment, the present inventors have compared the electrode plate 1 manufactured by the electrode plate manufacturing step S100 with the conventional method. The sliding width dimension of the electrode plate 201 manufactured by the electrode plate manufacturing step S200 was measured.
In addition, the sliding width dimension measured by this comparative verification experiment was made into the sliding width dimension in the bottom face part of the active material 212, for example, as shown in FIG.2 (b). In addition, the number of samples at this time was defined as 3 each.

  FIG. 4A shows “Condition A1” to be manufactured by the conventional electrode plate manufacturing step S200 with the vertical axis representing the sliding width dimension (unit [μm]), and the electrode plate of this example. It is the figure which showed the measured value of the said sliding width dimension by the dot in each case of "Condition A2" manufactured by manufacturing process S100.

  As shown in this figure, in the electrode plate 201 manufactured according to “Condition A1”, the sliding phenomenon of the active material 212 is observed for all the samples, and the sliding width dimension is within a range of about 200 [μm]. It fluctuated within.

  On the other hand, in the electrode plate 1 manufactured according to “Condition A2”, the sliding-down phenomenon of the active material 212 was not observed for all samples, and the active material 12 in the electrode plate manufacturing step S100 of the present example was not observed. The effectiveness of the anti-sliding effect could be confirmed.

Next, in order to confirm the effect of preventing an increase in the electrical resistance of the electrode plate 1 in the electrode plate manufacturing step S100 of the present embodiment, the inventors have made the electrode plate 1 manufactured by the electrode plate manufacturing step S100, The resistance values of the electrode plate 301 manufactured by the conventional electrode plate manufacturing step S300 were measured.
For reference, the resistance value of the electrode plate 201 manufactured by the conventional electrode plate manufacturing step S200 was also measured.

In FIG. 4B, the vertical axis represents the resistance value (unit [Ω · cm ² ]), “Condition B1” to be manufactured by the conventional electrode plate manufacturing step S200, and the conventional electrode plate manufacturing. The measured value of the resistance value in each case of “Condition B2” to be manufactured by Step S300 and “Condition B3” to be manufactured by the electrode plate manufacturing step S100 of this embodiment is represented by a bar graph. FIG.

As shown in this figure, in the electrode plate 301 manufactured according to “Condition B2”, a high resistance value exceeding 10 [Ω · cm ² ] is seen, and a pre-determined rule for quality control It was confirmed that the value r1 [Ω · cm ² ] was greatly exceeded.

On the other hand, in the electrode plate 1 manufactured according to “Condition B3”, only a small resistance value of about 1.0 [Ω · cm ² ] or less is observed, and the specified value r1 [Ω · cm ² ] was confirmed to be well below.

  From these results, it was possible to confirm the effect of preventing an increase in the electrical resistance of the electrode plate 1 in the electrode plate manufacturing step S100 of this example.

In addition, in the electrode plate 201 manufactured according to “Condition B1”, although the sliding-down phenomenon of the active material 212 is observed, the electrical resistance is increased by only a small resistance value within 1 [Ω · cm ² ]. Further, it was confirmed that the value was sufficiently lower than the specified value r1 [Ω · cm ² ].

  As described above, the electrode plate manufacturing step S100 that embodies the method for manufacturing the electrode plate for a lithium ion secondary battery according to the present invention is performed on both surfaces or one surface of the strip-shaped substrate (metal foil) 11. A coating step S102 for applying a paste-like active material 12 containing 13; a drying step S103 for drying the active material 12; and a drying step S103 for drying the active material 12; Rolling step S104 for rolling the base material (metal foil) 11 together with the dried and active material 12, and the active material 12 and the base material (metal foil) rolled after the rolling step S104. A slit process S105 for cutting the electrode 11 into a predetermined width dimension, and a manufacturing method of the electrode plate 1 for a lithium ion secondary battery, the manufacturing method including the coating process S1 The pre-coating step S101 is performed by the slitting step S105 on the plane on which the pasty active material 12 is to be applied by the coating step S102. The binding material 13A is preliminarily applied to a planned cutting location (virtual line C on the plane of the base material 11).

  By having such a configuration, according to the electrode plate manufacturing process S100 in the present embodiment, the temperature in the drying furnace is increased in order to increase the drying speed of the paste-like active material 12 in the drying process S103. However, it is possible to cut the electrode plate 1 to a predetermined length while preventing the active material 12 from slipping in the slitting step S105, and to suppress an increase in electrical resistance of the completed electrode plate 1.

  Therefore, the residence time of the base material 11 in the drying furnace can be shortened, the overall length of the drying furnace can be shortened, and the equipment cost of the coating equipment having the drying furnace can be greatly reduced. It is.

1 Electrode plate 11 Base material (metal foil)
DESCRIPTION OF SYMBOLS 12 Active material 13 Binder 13A Paste-like binder C Virtual line S100 Electrode board manufacturing process S101 Pre-coating process S102 Coating process S103 Drying process S104 Rolling process S105 Slit process

Claims (1)

A coating step of applying a paste-like active material containing a binder on both sides or one side of a strip-shaped metal foil;
A drying step, which is performed after the coating step, and dries the active material;
A rolling step, which is performed after the drying step, and rolls the metal foil together with the dried active material;
A slitting step, which is performed after the rolling step is finished and cuts the rolled active material and metal foil into a predetermined width;
A method for producing an electrode plate for a lithium ion secondary battery, comprising:
The manufacturing method includes a pre-coating step performed before the application step,
In the pre-coating step, a binder is applied in advance along a cutting portion scheduled to be cut by the slit step on a plane on which the application of the paste-like active material is planned by the coating step. ,
The width dimension of the binder applied in advance in the pre-coating process is defined based on the range of the sliding area of the active material generated in the slit process when the pre-coating process is not performed.
The manufacturing method of the electrode plate for lithium ion secondary batteries characterized by the above-mentioned.

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