JP2005190787A - Electrode plate for nonaqueous electrolyte secondary battery and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode plate for a nonaqueous electrolyte secondary battery, whereby a production speed can be raised, a highly precise electrode plate in which the film thickness of an active material layer is uniform in the boundary of a coated part and a non-coated part can be manufactured, and shrinkage and cracks are not caused in the boundary of the coated part and the non-coated part even if the electrode plate is compressed by a roll press. <P>SOLUTION: A coating layer of a coating sheet, which has the almost same width as that of a collector and an opening part having an optional pattern, is formed on the collector of a longitudinal metal foil, and the active material layer is applied to the entire surface on the collector a part of which is coated with the coating layer. After that, the coating layer and the active material layer on the coating layer are peeled off, and the roll press is applied to the active material pattern remaining on the collector. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrode plate for a non-aqueous electrolyte secondary battery and a method for producing the same, and more specifically, an efficient and shaped electrode plate for a non-aqueous electrolyte secondary battery having a non-coated portion on a current collector. The present invention relates to a highly accurate manufacturing method.

In recent years, development of large batteries for driving small electronic devices and for electric vehicles and nighttime power storage has been actively carried out in recent years, with higher capacity, higher energy density, and economical rechargeability. The demand for rechargeable batteries is increasing. As these typical secondary batteries, lead storage batteries, alkaline storage batteries, lithium secondary batteries (non-aqueous electrolyte secondary batteries) and the like are known.
The electrode plates of these secondary batteries have a configuration in which an active material layer containing an active material and a binder is formed on one side or both sides of a metal current collector. The electrode plate is provided with a non-coated portion for connecting a current collecting tab to a part of the electrode plate so as to expose the metal current collector surface.

In recent years, with the expansion of applications of non-aqueous secondary batteries, the need for efficiently producing high-performance non-aqueous electrolyte secondary batteries has increased. In recent industrial production, a method of forming an active material layer on the surface of a long current collector and cutting it into a predetermined dimension after pressing is common. Also in these manufacturing methods, it is necessary to provide the non-coating part for tab attachment in a part of electrode.
As a method of providing the non-coated portion on the electrode plate, a method of providing non-coated portions on both sides of the long current collector as shown in FIGS. 8 (a) and 8 (b), and a long collection as shown in FIG. There is a method of forming an uncoated portion in the transverse direction of the electric body. The former can provide a non-coating part by coating means, such as a gravure coat system, a die coat system, and a knife coat system. The latter can provide a non-coating part by the intermittent coating system which is described in the well-known document 1, for example.

By the way, a high-performance nonaqueous electrolyte secondary battery is manufactured by performing roll press on the electrode plate to increase the active material density, and then connecting a current collecting tab to the non-coated portion. There is a problem that the current collector is likely to be wrinkled or cracked at the boundary between the coated part and the non-coated part during compression by a press.
In order to prevent this, it is only necessary to reduce the compression ratio by the roll press. However, since the active material density cannot be increased, the amount of the active material in a certain volume cannot be increased, and the battery capacity is reduced. Arise.
In particular, when an electrode having the shape shown in FIGS. 8A and 8B is pressed, a difference occurs in deformation between the active material coated portion and the non-coated portion due to the pressure applied uniformly in the transverse direction by a press roll. The current collector is very prone to wrinkles and cracks. (See FIG. 7) On the other hand, when the electrode of FIG. 9 is pressed, pressure is uniformly applied in the transverse direction with a press roll, so that the current collector is relatively free of wrinkles and cracks at the boundary between the coated part and the non-coated part. Hard to occur.

Non-aqueous electrolyte secondary battery electrode manufacturing in recent years may have problems during the roll press, and intermittent coating forms a non-coated portion in the transverse direction of the long current collector. The mainstream is the method. However, the intermittent coating method is widely used industrially, but it is difficult to increase the production speed, and the thickness of the active material layer is not uniform at the boundary between the coated part and the non-coated part. It is difficult to obtain a highly accurate electrode plate.
Under the circumstances as described above, attempts have been made to improve some methods for producing electrode plates for non-aqueous electrolyte secondary batteries.

  For example, a proposal has been made to apply a masking tape in the transverse direction of a long current collector and peel the tape together with the active material layer after forming the active material layer (see Patent Document 2). However, although the shape accuracy of the active material layer is improved, there is a problem in that it is difficult to increase the production speed and efficient production because it is an intermittent process both when the tape is applied and when the tape is peeled off.

In addition, a method of masking the current collector in an arbitrary shape with a release layer has been proposed (see Patent Document 3). However, since the release layer does not have a base material, there is a problem that it is difficult to remove the release layer together with the active material layer formed on the release layer. For this reason, a method using a release sheet to peel the active material layer together with the release layer from the current collector has been proposed (see Patent Document 4). However, there is a problem that alignment with the release layer is difficult, the number of processes increases, and it is difficult to increase the production speed.
As described above, the manufacturing method of the electrode plate for a non-aqueous electrolyte secondary battery for efficiently manufacturing a high-accuracy electrode plate excellent in the shape accuracy of the coated part at a high production rate is still in the process of improvement and is described above. A manufacturing method that satisfies the demand has not been found.

Japanese Patent Laid-Open No. 1-184069 JP-A-10-144303 JP-A-10-144301 JP 2000-40506 A

  In view of the above-mentioned conventional problems, the present invention can increase the production speed, and can produce a highly accurate electrode plate in which the thickness of the active material layer is uniform at the boundary between the coated part and the non-coated part. A method of manufacturing an electrode plate for a nonaqueous electrolyte secondary battery that does not cause wrinkles or cracks at the boundary between the coated part and the non-coated part even when the electrode plate is compressed by a roll press, and its production It aims at providing the electrode plate excellent in the shape precision manufactured by the method.

The present invention includes a step of forming a covering layer made of a covering sheet having an opening having an arbitrary pattern on a current collector made of a long metal foil, having substantially the same width as the current collector, A step of forming an elongated laminate by coating an active material layer containing an active material and a binder over the entire surface of the current collector partially covered by the coating layer, the elongated laminate The laminate is roll-pressed before and / or after the step of peeling the coating layer and the active material layer on the coating layer in the longitudinal direction, and the step of peeling the coating layer and the active material layer on the coating layer. And a step of slitting the laminate before and / or after the roll pressing step. A method for producing an electrode plate for a non-aqueous electrolyte secondary battery is provided.
After forming a coating layer made of a coating sheet having an approximately the same width as the current collector and having an arbitrary pattern cut out on the current collector, an active material layer is coated on the coating layer, and a laminate By forming the covering pattern, the covering pattern can be continuously formed in the longitudinal direction of the long current collector, so that the production efficiency is higher than when a masking tape is installed in the width direction of the current collector. Will improve. Further, by forming the non-coated portion in the transverse direction, pressure is uniformly applied in the transverse direction when performing roll press, and wrinkles and cracks are unlikely to occur at the boundary between the coated portion and the non-coated portion.

According to the method for producing an electrode plate for a non-aqueous electrolyte secondary battery of the present invention, a region between the current collector and the non-coated portion is coated with a coating sheet in advance, and therefore the boundary between the coated portion and the non-coated portion. Therefore, it is possible to manufacture a highly accurate electrode plate with a uniform thickness of the active material layer.
In addition, since the covering sheet can be continuously applied to and peeled from the long current collector, the production speed can be increased, and even if it is compressed by a roll press, the coated part and the non-coated part Wrinkles and cracks do not occur at the boundaries of the parts.

In the production method of the present invention, on a current collector made of a long metal foil, a covering sheet having substantially the same width as the current collector and having an arbitrary pattern cut out is pasted in the longitudinal direction. Thereby, the said coating layer can be formed on the said electrical power collector, and the electrode plate for nonaqueous electrolyte secondary batteries can be manufactured.
Further, after a covering sheet having a width substantially the same as that of the current collector is pasted in the longitudinal direction on a current collector made of a long metal foil, the pasted covering sheet is cut into an arbitrary pattern. Thereby, the said coating layer may be formed on the said collector, and the electrode plate for nonaqueous electrolyte secondary batteries may be manufactured.

  According to the present invention, the shape of the active material layer is improved by masking the periphery of the active material layer to be formed with a coating sheet, and when forming the non-coated portion in the transverse direction, The production speed can be increased compared to the intermittent coating method and masking method. Furthermore, by forming the non-coated part in the transverse direction, even if the laminate after peeling the covering sheet is compressed by a roll press, the distortion during pressing is alleviated, so the coated part and the non-coated part Generation of wrinkles and cracks at the boundary can be suppressed.

Next, the present invention will be described in more detail with reference to preferred embodiments.
Examples of the current collector made of the metal foil used in the present invention include stainless steel, nickel, copper, titanium, and aluminum. Aluminum or aluminum alloy is preferable for the positive electrode plate, and copper or copper alloy for the negative electrode plate. Is preferred.

The active material layer applied according to the present invention is composed of a coating liquid composed of at least an active material and a binder, and can contain a conductive material, a solvent, and the like. As the positive electrode active material used in the present invention, for example, lithium oxides such as LiCoO ₂ , LiNiO ₂ and LiMn ₂ O ₄ are suitable. On the other hand, as the negative electrode active material, carbonaceous materials such as natural graphite, artificial graphite, graphitizable carbon, and non-graphitizable carbon are suitable.
These active materials are preferably uniformly dispersed in the active material layer formed on the current collector, and as a binder for dispersing them, fluorine resins such as polyvinylidene fluoride, rubber-based materials Alternatively, a silicone / acrylic copolymer or the like is used.

  Examples of conductive materials that can be used in the present invention include graphites such as natural graphite and artificial graphite, carbon blacks such as acetylene black and ketjen black, conductive fibers, metal powders, and conductive metal oxides. They can be used alone or in combination.

The covering sheet is a sheet that can be peeled off without damaging the current collector with a predetermined peeling force after being attached to the current collector to form an active material layer, and examples thereof include an adhesive sheet and a heat-sealable sheet. . They are composed of at least a base material and a seal layer.
As the base material of the covering sheet, a polyethylene terephthalate film is preferable, and a biaxially stretched film is particularly preferable because of excellent heat resistance and strength characteristics. Since it is necessary to dry and remove the solvent at the time of forming the active material layer, a certain heat resistance is required, and preferably the thermal shrinkage is within 0.5% at 120 ° C. × 5 min. The thickness of the substrate is preferably 12 μm or more and 75 μm or less. If it is less than 12 μm, the covering sheet may be cut when the peeling speed is increased, and if it is thicker than 75 μm, it is not economical and tends to be difficult to cut into a predetermined shape.

There is no restriction | limiting in particular about the thickness of the whole coating sheet, The optimal thickness can be selected in the range which does not have a bad influence on manufacture and quality.
The 180 degree peel strength of the cover sheet with respect to aluminum is preferably 0.1 g / cm or more and 100 g / cm or less, and more preferably 10 g / cm or less, when measured at a peel rate of 300 mm / min. If it is less than 0.1 g / cm, the coating liquid tends to soak under the coated sheet from the cut-out edge of the sheet when forming the active material layer, and if it exceeds 100 gf / cm, the current collector is likely to be damaged when peeled off. It is easy to cause discontinuous peeling when performing high speed peeling. Furthermore, it tends to cause a tape break.

As a means for sticking the covering sheet to the current collector, it can be performed by a generally known method, for example, a method of sticking while pressing with an elastic rubber roll or a method of sticking while applying heat pressure with a heat roller. is there. Examples of means for cutting out into a predetermined shape include a method of cutting out with a punching blade, a method of cutting out with heat or laser, and the like. These means can be used in combination, and are not limited to these means.
The step of pasting the covering sheet on the current collector and forming the active material layer thereon is performed on both sides of the current collector, and after forming the active material layer on both sides, the subsequent peeling step and the like are performed. May be. In that case, the coating layer and the active material layer may be formed on one surface and then the coating layer may be formed on the other surface, or the active material layer may be formed in order after the coating layer is formed on both surfaces. Also good. When the coating layer and the active material layer are formed on both sides of the current collector, the electrode sheet is finally produced by forming the coating sheet and the active material layer so as to be substantially symmetrical with the current collector interposed therebetween. Preferred above.

Since peeling of the covering sheet can be efficiently peeled by increasing the peeling speed, it is desirable that the peeling force is light. For this reason, it is preferable to use the biaxially stretched polyethylene terephthalate as the tape base material within the above-described range of the peel strength, so that it is possible to make it more difficult to break the coated sheet. Furthermore, before peeling off the covering sheet, the active material layer is half-cut according to the pattern of the opening of the covering sheet, thereby reducing the load applied at the time of peeling and making it more difficult for the covering sheet to break. .
The method of half-cutting the active material layer before peeling off the masking tape is not particularly limited as long as the current collector and the tape can be cut without damaging the active material layer. It is only necessary to make a cut at a depth less than the thickness of the film.

The electrode plate of the present invention needs to improve the active material density of the electrode plate by roll pressing, and the roll pressing step is preferably before and / or after the step of peeling the coated sheet. . In addition, by using a gap adjusting stopper at the time of roll press so that the interval between the press rolls is not too narrow, the non-coated portion not coated with the active material is deformed. It is also effective to suppress it.
The roll pressing process
(1) A method that is performed only after the coated sheet is peeled off,
(2) A method in which a preliminary press is performed before the covering sheet is peeled off, and this press is performed after the covering sheet is peeled off,
(3) There is a method of performing the covering sheet only before peeling. Here, the preliminary press is a means that is performed at a pressure lower than that of the main press, and is performed in order to reduce powder falling off of the active material layer and improve the shape accuracy when the covering sheet is peeled off. These methods can be selected according to the required electrode characteristics, but (1) or (2) is preferred when the compression ratio is increased by roll press treatment. (3) is a useful method when the compression ratio is such that wrinkles and cracks do not occur in the electrode when roll pressing is performed.

  In the roll press treatment in the production method of the present invention, a step of roll pressing is performed on a current collector in which an active material layer is formed on one side or both sides. The roll press conditions at that time are preferably in the range of 200 to 2,000 kg / cm of linear pressure, and particularly preferably in the range of 600 to 1,500 kg / cm of linear pressure. If the roll press pressure is lower than the linear pressure of 200 kg / cm, a step is likely to occur on the surface of the active material layer, and if the roll press pressure is higher than the linear pressure of 2,000 kg / cm, the electrode plate is likely to be damaged.

  For example, as shown in FIG. 5B, the electrode plate on which the non-coated portion is formed is slit (trimmed) in the longitudinal direction at both ends of the coating before and / or after the roll pressing step. It is possible to improve the smoothness of the film and to suppress the occurrence of wrinkles and cracks due to the roll press. Moreover, as shown in FIG. 5 (a), it is possible to slit with an arbitrary width in the longitudinal direction other than both ends of the coating. The form of the slit in the electrode plate of the present invention is not limited to these. The elongated electrode plate thus slit is cut in an arbitrary width in the longitudinal direction, and for a nonaqueous electrolyte secondary battery in which a current collecting tab is formed as shown in FIGS. 10 (a) and 10 (b). It becomes an electrode plate.

  An example for realizing the manufacturing process of the electrode plate for a non-aqueous electrolyte secondary battery as a continuous line is shown in FIG. The current collector 1 continuously unwound from the unwinding roll 6 is provided with a peelable sheet 2 having an arbitrary shape cut out by a die roll 7 on one side thereof, and a width approximately the same as that of the current collector 1 by an attaching roll 9a. The active material layer is formed on the entire surface by the active material layer coating / drying apparatus 10a. Next, the active material layer is formed on the entire surface by the same process on the opposite surface, and after the preliminary press 5, the release sheets on both sides are peeled off by the peeling roll 11, and the coating both sides are slit (trimmed) by the slitter 13, This press 5 is performed. Then, the completed electrode plate is wound with a slitter 13 having a predetermined width.

  Here, the step of attaching the release sheet 2 in FIG. 6A will be described with reference to FIG. The release sheet 2 is continuously unwound from the unwinding roll 8 and cut out into an arbitrary shape by the die roll 7. The cut residue is removed by a waste transporting blower. And the peeling sheet 2 cut out by arbitrary shapes is affixed on a collector surface by the anvil roll 9b. When it is necessary to form the active material layers on both sides of the current collector, the release sheet 2 is pasted by controlling the positional relationship with the back surface by a pasting alignment mechanism (not shown).

Embodiments of the present invention will be described below in detail with reference to the drawings.
In addition, although an Example demonstrates the positive electrode plate for nonaqueous electrolyte secondary batteries to an example, this invention is not limited to this. In the text, “part” represents a part by mass.

(Example 1)
First, a positive electrode coating solution containing a positive electrode active material and a binder used in this example was prepared by the following method. As a positive electrode active material, 9 parts of acetylene black and 3 parts of polyvinylidene fluoride were mixed with 100 parts of LiMn ₂ O ₄ powder having a particle size distribution of 1 to 50 μm and an average particle size of 10 μm, and N-methyl-2-pyrrolidone. It was made to suspend in the solution and the paste-form positive electrode coating liquid was obtained.

  In FIG. 1, an aluminum foil having a width of 320 mm and a thickness of 20 μm is used for the long current collector 1, and the long covering sheet is 320 mm wide and pasted on one side so as to be integrated with the current collector 1 in advance. It was. As shown in FIG. 1, the covering sheet 2 has an opening portion that is previously cut into a size of 280 mm × 280 mm at intervals of 30 mm, and the base material is biaxially stretched polyethylene terephthalate having a thickness of 25 μm. What provided the 9-micrometer-thick acrylic adhesive layer was used. 180 degree peel strength with respect to aluminum of this coating sheet 2 was 4.1 g / cm when measured at a peel rate of 300 mm / min.

The current collector 1 in which the covering sheet 2 is previously bonded on one side is continuously coated and dried on the current collector 1 using a die coater, using the positive electrode coating solution obtained above. Thus, an active material layer 3 was formed. The active material layer thickness after drying was 100 μm at the cut-out portion (coated portion) of the coating sheet 2. By repeating the same process on the opposite surface, a coating layer is applied at a substantially contrasting position with the current collector sandwiched therebetween, and the same process is followed, and the 100 μm active material layer is also formed on the other surface of the current collector 1. 3 was formed.
Next, as shown in FIG. 2, the coating sheet 2 and the active material layer on the coating sheet are simultaneously peeled off, a non-coated part is provided as shown in FIG. 3, and both sides are slit (trimming) as shown in FIG. Then, roll pressing was performed at a linear pressure of 800 kg / cm, the thickness of the active material layers on both sides was set to 70 μm, and the electrode plate for positive electrode of Example 1 was obtained through the slit process.

(Example 2)
In Example 1, the covering sheet 2 is attached to the entire surface so as to be integrated with the current collector 1 without being cut out to a predetermined size, and then the heated punching blade is lightly pressed to remove the burned-out portion. Thus, a positive electrode plate of Example 2 was produced in the same manner as in Example 1 except that the coating layer was formed by cutting out at 30 mm intervals with a size of 280 mm × 280 mm.

(Example 3)
In Example 1, after the active material layer 3 was formed on both surfaces of the current collector 1, roll pressing (preliminary pressing) was performed at a linear pressure of 200 kg / cm, and the active portion of the coated sheet 2 (coating portion) was cut. The material layer thickness was 90 μm on each side of the current collector. Next, after half-cutting the boundary between the coated part and the non-coated part, both sides of the coating sheet 2 are peeled off at the same time, and roll pressing (main press) is performed at a linear pressure of 800 kg / cm to obtain the active material layer thickness on both sides A positive electrode plate of Example 3 was prepared in the same manner as in Example 1 except that the thickness of each was 70 μm.

Example 4
An aluminum foil having a width of 600 mm and a thickness of 20 μm was used for the current collector 1, and the covering sheet 2 had a width of 600 mm and was pasted on one side so as to be integrated with the current collector 1 in advance. The cover sheet 2 is cut in advance so as to be in the form of FIG. 4, and the base material is a biaxially stretched polyethylene terephthalate having a thickness of 16 μm provided with an acrylic adhesive layer having a thickness of 3 μm. It was. 180 degree peel strength with respect to aluminum of this coating sheet 2 was 3.7 g / cm when measured at a peel rate of 300 mm / min.
The current collector 1 with the covering sheet 2 attached in advance on one side is continuously coated and dried on the current collector 1 using a knife coater, using the positive electrode coating solution obtained above. Thus, an active material layer 3 was formed.

The active material layer thickness after drying was 120 μm at the cut-out portion (coated portion) of the covering sheet 2. By repeating the same process on the opposite surface, the active material layer 3 having a thickness of 120 μm was formed at a substantially contrasting position with the current collector interposed therebetween.
Subsequently, a roll press is performed at a linear pressure of 600 kg / cm so that the thicknesses of the active material layers on both sides are 90 μm, respectively, and then the coating sheet 2 is peeled off on both sides at the same time. It was.

(Comparative Example 1)
On both surfaces of the current collector 1 used in Example 1, the positive electrode coating solution obtained above was continuously applied and dried to form the form shown in FIG. On this surface, an active material layer 3 having a thickness of 100 μm was formed in which a non-coated portion having a width of 20 mm was provided on both sides and the central portion. Subsequently, roll pressing was performed at a linear pressure of 800 kg / cm so that the thickness of the active material layer was 70 μm, and the positive electrode plate of Comparative Example 1 was obtained.

(Comparative Example 2)
On both surfaces of the current collector 1 used in Example 1, the positive electrode coating solution obtained above was 280 mm × having the same shape as the positive electrode plate of Example 1 by a slit die type intermittent coating apparatus. Application and drying were performed intermittently at intervals of 280 mm and 30 mm, and active material layers 3 each having a thickness of 100 μm were formed symmetrically with current collectors sandwiched between both sides. Subsequently, roll pressing was performed at a linear pressure of 800 kg / cm, and the thickness of the active material layers on both sides was set to 70 μm, so that a positive electrode plate of Comparative Example 2 was obtained.

  With respect to the above positive electrode plate, the shape accuracy of the active material layer (the boundary between the coated part and the non-coated part) and the occurrence of wrinkles and cracks were observed.

  Since the electrode plate of Comparative Example 1 is provided with the non-coated portion in the longitudinal direction by the coating means, at the boundary between the coated portion and the non-coated portion as shown in FIG. Film sagging occurred and the shape accuracy was poor. Moreover, many wrinkles generate | occur | produced in the non-coating part by the roll press like FIG. 7, and the crack generate | occur | produced in one part.

  The electrode plate of Comparative Example 2 did not show wrinkles or cracks due to the roll press, but the non-coated portion was provided in the transverse direction by the intermittent coating means, so that the coated portion as shown in FIG. In the boundary portion between the non-coating portion and the coating end, film sagging occurs or the coating end rises, resulting in poor shape accuracy.

On the other hand, about the electrode plate of Examples 1-4, favorable shape precision was obtained like FIG.11 (b), and neither generation | occurrence | production of the wrinkle and crack by a roll press was observed.

It is a figure which shows the structural example which affixed the coating sheet which cut out predetermined magnitude | size on the electrical power collector. It is a figure which shows typically the process of peeling a coating sheet simultaneously on both surfaces, and forming an active material layer in arbitrary shapes. It is a figure which shows an example of the electrode plate of this invention, and is a figure which shows the example which a coating sheet peels after an active material layer is coated, and an uncoated part exists in arbitrary shapes on a collector. It is a figure which shows the structural example which affixed the coating sheet which cut out predetermined magnitude | size on the electrical power collector. (A) It is a figure which shows an example of the electrode plate of this invention, and is a figure which shows slitting the electrode plate after peeling a peeling sheet to a longitudinal direction. (B) It is a figure which shows an example of the electrode plate of this invention, and is a figure which shows slitting the electrode plate after peeling a peeling sheet to a longitudinal direction. (A) It is a figure explaining an example of the process of manufacturing the electrode plate of this invention. (B) It is a figure explaining A part in detail. It is a figure which shows typically the state which roll-presses the electrode plate in which the non-coating part was formed in stripe form on the electrical power collector, and a wrinkle generate | occur | produces in an electrode plate. (A) It is a figure which shows the prior art example which provided the non-coating part by the coating on the longitudinal direction both sides of the electrical power collector. (B) It is a figure which shows the prior art example which provided the some continuous stripe-form non-coating part by the coating in the longitudinal direction of the electrical power collector. It is a figure which shows the prior art example which provided the non-coating part in the cross shape by intermittent coating. (A) It is a figure which shows an example of the structure which attached the tab for current collection to the electrode plate of this invention. (B) It is a figure which shows an example of the structure which attached the tab for current collection to the electrode plate of this invention. (A) It is a figure which illustrates the shape of the boundary vicinity of the coating part formed by the coating means and a non-coating part schematically. (B) It is a figure which illustrates schematically the shape of the vicinity of the boundary of the coating part and non-coating part in the electrode plate of this invention.

Explanation of symbols

1: current collector 2: coating sheet 3: active material layer 4: current collecting tab 5: press roll 6: current collector feeding roll 7: die roll 8: release sheet feeding roll
9a: Anvil roll on the upper side of the current collector 9b: Anvil roll on the lower side of the current collector 10a: Active material coating / drying device 10b on the upper side of the current collector 11: Active material coating / drying device on the lower side of the current collector 11: Cover sheet peeling roll 12: Cover sheet winding roll 13: Slit device 14: Electrode plate winding roll 15: Laminating roll 16: Guide roll 17: Punching blower 18: Punching scrap

Claims (5)

  A step of forming a covering layer made of a covering sheet having an opening having an arbitrary pattern on the current collector made of a long metal foil and having substantially the same width as the current collector, A step of forming an elongated laminate by coating an active material layer containing an active material and a binder on the entire surface of a partially coated current collector, the coating from the elongated coated product A step of peeling the layered body and the active material layer on the coating layer in the longitudinal direction, and a step of roll-pressing the laminate before and / or after the step of peeling the coating layer and the active material layer on the coating layer. And a step of slitting the laminate before and / or after the roll pressing step. A method for producing an electrode plate for a non-aqueous electrolyte secondary battery.   On the current collector made of the long metal foil, the current collector is pasted in the longitudinal direction with a covering sheet having substantially the same width as the current collector and having an arbitrary pattern cut out. The method for producing an electrode plate for a nonaqueous electrolyte secondary battery according to claim 1, wherein the coating layer is formed thereon.   On the current collector made of the long metal foil, a covering sheet having substantially the same width as the current collector is pasted in the longitudinal direction, and then the pasted covering sheet is cut into an arbitrary pattern. The method for producing an electrode plate for a nonaqueous electrolyte secondary battery according to claim 1, wherein the coating layer is formed on the current collector.   The electrode plate for a nonaqueous electrolyte secondary battery according to any one of claims 1 to 3, wherein the active material layer is half-cut according to the opening pattern of the covering sheet before the covering sheet is peeled off. Manufacturing method. The electrode plate for nonaqueous electrolyte secondary batteries manufactured with the manufacturing method in any one of Claims 1-4.

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