JP2021157951A - Electrode plate for nonaqueous secondary battery, nonaqueous secondary battery, and method for manufacturing electrode plate - Google Patents

Abstract

To provide an electrode plate for a nonaqueous secondary battery and the like, capable of suppressing current concentration near a recess that is provided on the surface of a mixture layer including an active material.SOLUTION: An electrode plate 1 for a nonaqueous secondary battery includes: a current collector 11; and a mixture layer 12 provided on the surface of the current collector 11 and including at least an active material. The electrode plate for a nonaqueous secondary battery has a recess 13 and a protrusion 14 on a surface layer of the mixture layer 12. The protrusion 14 is located around an opening of the recess 13. The density of the active material in at least a part of the recess 13 is less than the density of the active material at the inside of the mixture layer in a part that is not provided with the recess 13 and the protrusion 14.SELECTED DRAWING: Figure 1

Description

The present invention relates to a electrode plate for a non-aqueous secondary battery, a non-aqueous secondary battery, and a method for manufacturing the electrode plate.

In recent years, lithium ion secondary batteries have been widely used as a power source for electric vehicles and hybrid vehicles. A lithium ion secondary battery is a non-aqueous secondary battery that can be charged and discharged by moving lithium ions in an electrolytic solution between a positive electrode and a negative electrode that occlude and release lithium ions.

Generally, a lithium ion secondary battery is composed of a positive electrode and a negative electrode laminated via a separator, and each electrode (positive electrode and negative electrode) has a mixture layer containing at least an active material on the surface of a current collector. It is composed of coating.

Patent Document 1 describes an electrode including a current collector layer formed of a conductor, an active material layer, and an adhesive layer for adhering the current collector layer and the active material layer. Here, the active material layer is an active material particle that stores an electric charge, a conductive auxiliary agent that transmits the electric charge stored in the active material particle to the current collecting layer, and a binder that binds the active material particle and the conductive auxiliary agent. And has irregularities on the opposite side of the current collecting layer. These irregularities are formed by pressing one end face of the active material layer by a rolling process. As a result, in the electrode described in Patent Document 1, the distance to the current collecting layer like a recess without changing the total amount of the active material particles contained in the active material layer (without changing the energy density of the active material layer). Reduces electrical internal resistance in small areas.

Japanese Unexamined Patent Publication No. 2013-187468

However, the technique described in Patent Document 1 reduces the electrical internal resistance while maintaining the energy density of the active material layer (that is, without removing the active material), and therefore the active material in the vicinity of the recess. There is a concern that the layers will become denser. Then, due to the high density of the active material layer in the vicinity of the recess, an electrode in which the current is concentrated is formed in the vicinity of the recess.

Further, in the case of the negative electrode in the lithium ion secondary battery, the density of the active material layer in the vicinity of the recess is increased, so that the diffusion path of the electrolytic solution is reduced in the vicinity of the recess, and as a result, the surface layer of the recess is formed. The current density increases and the lithium precipitation resistance deteriorates. It should be noted that such a problem may occur in a non-aqueous secondary battery other than the lithium ion battery.

The present invention has been made to solve such a problem, and is a electrode plate for a non-aqueous secondary battery capable of suppressing current concentration in the vicinity of a recess provided on the surface of a mixture layer containing an active material. An object of the present invention is to provide a non-aqueous secondary battery provided with the electrode plate, and a plate manufacturing method for producing the electrode plate.

The electrode plate for a non-aqueous secondary battery according to one aspect of the present invention includes a current collector and a mixture layer provided on the surface of the current collector and containing at least an active material. The surface layer of the concave portion and the convex portion are located around the opening of the concave portion, and the density of the active material in at least a part of the concave portion is such that the concave portion and the convex portion are not provided. It is less than the density of the active material inside the mixture layer of the portion.

Since the electrode plate for a non-aqueous secondary battery according to this embodiment has a mixture layer containing an active material formed so as to have a density difference as described above, it is located in the vicinity of a recess provided on the surface of the mixture layer. It becomes possible to suppress the current concentration.

Further, the density of the active material in the surface layer in the vicinity of the opening of the concave portion and the convex portion is the density of the active material in the mixture layer of the portion where the concave portion and the convex portion are not provided. It is preferably smaller than the density of. As a result, the current concentration near the opening can be suppressed.

Further, the density of the active material in the surface layer of the concave portion is preferably smaller than the density of the active material in the inside of the mixed material layer in the portion where the concave portion and the convex portion are not provided. As a result, the current concentration in the recess can be suppressed for the entire recess.

Further, the electrode plate for the non-aqueous secondary battery can be an electrode plate for the negative electrode. Thereby, the component precipitation resistance at the negative electrode can be improved.

The non-aqueous secondary battery according to another aspect of the present invention uses the non-aqueous secondary battery electrode plate as a negative electrode. Thereby, in the non-aqueous secondary battery, the component precipitation resistance at the negative electrode can be improved.

The non-aqueous secondary battery according to another aspect of the present invention uses the non-aqueous secondary battery electrode plate as at least one electrode plate of a negative electrode and a positive electrode. As a result, in the non-aqueous secondary battery, the concentration of electric resistance in the vicinity of the recess of the mixture layer can be suppressed, and the electrochemical reaction can be made uniform.

The electrode plate manufacturing method according to another aspect of the present invention is a electrode plate manufacturing method for manufacturing a electrode plate for a non-aqueous secondary battery, in which a mixture layer containing at least an active material is formed on the surface of a current collector. The forming step, the pressing step of forming the concave portion and the convex portion on the surface layer of the mixed material layer by pressing the surface of the mixed material layer using the mold having the convex portion and the concave portion, and the pressing process of the mold. It includes a removal step of removing from the mixture layer. Here, the concave portion of the mold is located around the convex portion of the mold, and the convex portion of the mold has a friction coefficient in the direction with respect to the mixture layer during the pressing step during the removing step. It has a shape smaller than the coefficient of friction in the direction with respect to the mixture layer.

In the electrode plate manufacturing method according to this aspect, since the mixture layer containing the active material can be formed so as to have the above-mentioned density difference, the current concentration in the vicinity of the recess provided on the surface of the mixture layer is concentrated. It is possible to manufacture a electrode plate for a non-aqueous secondary battery that can be suppressed.

According to the present invention, a electrode plate for a non-aqueous secondary battery capable of suppressing current concentration in the vicinity of a recess provided on the surface of a mixture layer containing an active material, a non-aqueous secondary battery provided with the electrode plate, and a non-aqueous secondary battery. It can be provided to provide a plate manufacturing method for manufacturing the electrode plate.

It is schematic cross-sectional view which partially shows an example of the electrode plate for a non-aqueous secondary battery which concerns on Embodiment 1. FIG. It is a schematic top view of the electrode plate for a non-aqueous secondary battery of FIG. It is schematic cross-sectional view which shows an example of the electrode plate for a non-aqueous secondary battery which concerns on a comparative example partially. It is a flow chart for demonstrating an example of the electrode plate manufacturing method for manufacturing the electrode plate for a non-aqueous secondary battery of FIG. FIG. 5 is a schematic cross-sectional view partially showing an example of a die used in the pressing step of FIG. 4 and a mixture layer pressed by the die. It is an enlarged view of a part of the mold of FIG. It is a figure which shows the test example of the density difference of the active material inside the mixture layer and around the recess in the electrode plate for a non-aqueous secondary battery manufactured by the manufacturing method of FIG. It is a figure which shows the test example of the diffusion resistivity ratio between the inside of a mixture layer and the periphery of a recess in the electrode plate for a non-aqueous secondary battery manufactured by the manufacturing method of FIG.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings have been simplified as appropriate. Further, in the embodiment, the same or equivalent elements may be designated by the same reference numerals, and duplicate description may be omitted as appropriate.

(Embodiment 1)
The first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic cross-sectional view partially showing an example of a non-aqueous secondary battery electrode plate according to the first embodiment, and FIG. 2 is a schematic top view of the non-aqueous secondary battery electrode plate of FIG.

As shown in FIG. 1, the electrode plate 1 for a non-aqueous secondary battery according to the present embodiment has a current collector 11 and a mixture layer (combination) provided on the surface of the current collector 11 and containing at least an active material. Agent layer) 12 and. The surface layer of the mixture layer 12 has a concave portion 13 and a convex portion 14. As shown in FIG. 1, the recess 13 can be formed so as to extend in the thickness direction from the surface of the mixture layer 12.

In addition, although FIG. 1 and FIG. 2 give an example in which the shape of the concave portion 13 is a conical shape, the shape is not limited to the illustrated one. Further, an example is given in which the shape of the convex portion 14 is a donut shape when viewed from the upper surface and the cross section is a mountain shape (one portion of the torus divided into two along the circumferential direction). , Not limited to the examples.

The convex portion 14 is located around the opening of the concave portion 13. The density of the active material in at least a part of the concave portion 13 is smaller than the density of the active material in the mixture layer 12 in the portion where the concave portion 13 and the convex portion 14 are not provided. In other words, the density of the active material in at least a part of the recess 13 is smaller than the density of the active material in the mixture layer 12 before the unevenness is formed. FIG. 1 illustrates a low-density layer 15 having a low density in a portion of the recess 13 including at least a part thereof.

In the above-mentioned electrode plate 1, since the mixture layer 12 is formed so as to have the above-mentioned density difference, the current concentration in the vicinity of the recess 13 provided on the surface of the mixture layer 12 containing the active material is concentrated. It becomes possible to suppress it.

The electrode plate 1 for a non-aqueous secondary battery (hereinafter referred to as an electrode plate 1) can be used as at least one electrode plate (electrode) of a positive electrode and a negative electrode of a non-aqueous secondary battery. It should be noted that it is sufficient that the non-aqueous secondary battery can function as a secondary battery regardless of how the electrode plate 1 is arranged. For example, the electrode body of a non-aqueous secondary battery can be configured by laminating a positive electrode and a negative electrode via a separator, and in that case, the positive electrode current collector and the negative electrode current collector are respectively attached to the ends of the positive electrode body and the negative electrode body. A lead-out electrode for the positive electrode and a pull-out electrode for the negative electrode are provided. Alternatively, the electrode body of the non-aqueous secondary battery can be used as the wound electrode body. The wound electrode body can be configured by laminating a positive electrode and a negative electrode via a separator, and then winding the laminated body to make it flat. Each of the positive electrode current collector and the negative electrode current collector has an uncoated portion in which the mixture layer is not coated, and the uncoated portion has a lead-out electrode for the positive electrode and a lead-out electrode for the negative electrode. Each is provided.

In the following, a lithium ion secondary battery will be described as an example as a non-aqueous secondary battery.
When the electrode plate 1 is applied to the positive electrode of a lithium ion secondary battery, it can be configured as follows. When forming a positive electrode, aluminum or an alloy containing aluminum as a main component can be used as the current collector 11. The mixture layer (positive electrode mixture layer) 12 can be formed by using a positive electrode active material, a conductive material, and a binder.

The positive electrode active material is a material capable of occluding and releasing lithium ions. For example, _{NCA in which lithium cobalt oxide (LiCoO 2} ), lithium nickel oxide (LiNiO ₂ ), and lithium aluminum oxide (LiAlO ₂ ) are mixed at an arbitrary ratio. System materials can be used. As an example, LiNi _0.8 Co _0.15 Al _0.05 O ₂ can be used. The positive electrode active material is not limited to these materials, and any material may be used as long as it can occlude and release lithium ions. As the conductive material, for example, acetylene black (AB) or a graphite-based material can be used. Further, carbon nanotubes may be used as the conductive material. As the binder, for example, polyvinylidene fluoride (PVdF), styrene butadiene rubber (SBR), polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC) and the like can be used.

When forming a positive electrode, a conductive material and a binder are mixed with the positive electrode active material, and the mixture is put in a solvent such as NMP (N-methyl-2-pyrrolidone) and kneaded. Then, the positive electrode mixture after kneading is applied onto the current collector (positive electrode current collector) 11, dried, and further rolled to form a positive electrode.

When the electrode plate 1 is applied to the negative electrode of a lithium ion secondary battery, it can be configured as follows. When forming the negative electrode, copper, nickel, or an alloy thereof can be used as the current collector 11. The mixture layer (negative electrode mixture layer) 12 can be formed by using a negative electrode active material and a binder.

The negative electrode active material is a material capable of occluding and releasing lithium ions, and for example, a powdered carbon material made of natural graphite or the like can be used. As the binder, the above-mentioned binder can be used. When forming the negative electrode, the negative electrode active material, the binder, and the solvent are kneaded, and the kneaded negative electrode mixture is applied onto the negative electrode current collector, dried, and further rolled.

In the following, an electrode plate used for the negative electrode as the electrode plate 1 will be taken as an example, and the effect of the present embodiment will be described by comparison with the comparative example of FIG. FIG. 3 is a schematic cross-sectional view partially showing an example of an electrode plate (negative electrode) for a non-aqueous secondary battery according to a comparative example.

The electrode plate 100 according to the comparative example includes a current collector 111 and a mixture layer 112 provided on the surface of the current collector 111 and containing at least an active material. Then, the concave portion 113 is provided on the surface layer of the mixture layer 112, and the concave portion 113 is formed by pressing with a mold having a convex portion. As shown in FIG. 3, the recess 113 is formed so as to extend in the thickness direction from the surface of the mixture layer 112. However, in the electrode plate 100, unlike the electrode plate 1, the density of the active material in the surface layer of the recess 113 is higher than the density of the active material in the mixture layer 112 in the portion where the recess 113 is not provided. In FIG. 3, a high-density layer 115 having a higher density than the surroundings on the surface layer of the recess 113 is shown.

In the electrode plate 100 according to the comparative example, due to the high density of the active material layer in the vicinity of the recess 113 shown by the high density layer 115, the electrode becomes an electrode in which the current concentrates in the vicinity of the recess 113, and the vicinity of the recess 113. The diffusion path of the electrolytic solution is reduced, the current density of the surface layer of the recess 113 is increased, and the lithium precipitation resistance is deteriorated.

On the other hand, in the electrode plate 1 according to the present embodiment, since the low density layer 15 is formed in the vicinity of the recess 13, the diffusion path of the electrolytic solution in the vicinity of the recess 13 increases as compared with the comparative example. It is difficult for current to concentrate in the vicinity of the recess 13, and the lithium precipitation resistance can be improved.

As described above, by using the electrode plate 1 according to the present embodiment for one of the positive electrode and the negative electrode of the non-aqueous secondary battery, more preferably for both, electricity in the vicinity of the recess 13 of the mixture layer 12 The concentration of resistance can be suppressed, and the electrochemical reaction can be made uniform. Further, by using the electrode plate 1 as the electrode plate for the negative electrode, the precipitation resistance of the electrolytic solution component in the negative electrode can be improved. That is, in a non-aqueous secondary battery using such a negative electrode, the component precipitation resistance at the negative electrode can be improved.

Next, an example of the method for manufacturing the electrode plate 1 as described above will be described with reference to FIGS. 4 to 6. FIG. 4 is a flow chart for explaining an example of a plate manufacturing method for manufacturing the electrode plate 1 of FIG. FIG. 5 is a schematic cross-sectional view showing an example of a die used in the pressing step of FIG. 4 and a mixture layer pressed by the die, and FIG. 6 is an enlarged part of the die of FIG. It is a figure.

This manufacturing method includes a forming step (step S1), a pressing step (step S2), and a removing step (step S3). First, in step S1, a mixture layer 12 containing at least the active material is formed on the surface of the current collector 11. For example, such a formation can be carried out by kneading a mixture containing an active material, a binder and the like, and applying (coating) it to the current collector 11.

Next, in step S2, the concave portion 13 and the concave portion 13 and the surface layer of the mixed material layer 12 are pressed by pressing the surface of the mixed material layer 12 with the mold 2 having the convex portion 23 and the concave portion 24 as illustrated in FIG. The convex portion 14 is formed. That is, in step S2, the mixture layer 12 is processed using the mold 2. At the time of processing, the convex portion 23 is inserted into the mixture layer 12. Here, the mold 2 is formed so that the concave portion 24 is located around the convex portion 23. The mold 2 has a flat surface portion 21 that is flat in a portion other than the convex portion 23 and the concave portion 24.

After the process of step S2, in step S3, the mold 2 is removed (pulled back) from the mixture layer 12. In step S3, the convex portion 23 is removed from the composite material layer 12.

In particular, as one of the main features of this manufacturing method, the convex portion 23 of the mold 2 has a friction coefficient (dynamic friction coefficient) in the direction with respect to the mixture layer 12 during the pressing process, which is the direction with respect to the mixture layer 12 during the removal process. It has a shape smaller than the coefficient of friction (dynamic friction coefficient) of. That is, the convex portion 23 of the mold 2 has a shape in which the frictional force against the mixture layer 12 during the pressing process is smaller than the frictional force against the mixture layer 12 during the removal process. By satisfying such conditions, in the removal step of step S3, the mixture layer 12 containing the active material adheres to the pulled-back mold 2, and the mixture layer 12 containing the active material is scraped out from the recess 13. be able to.

As an example of such a shape, as shown in FIG. 6, the convex portion 23 can have a protruding portion 23b directed in a direction away from the mixture layer 12 during the removal step. The fact that such a protrusion 23b is formed on the surface of the convex portion 23 means that the concave portion 23c is also formed on the surface of the convex portion 23. The recess 23c is a portion that does not come into close contact with the mixture layer 12 at the time of insertion. In this example, a set of shapes including the protrusions 23b and the recesses 23c are arranged on the surface of the protrusions 23.

The shape of the convex portion 23 (including the surface shape) is preferably a shape that makes it easy to dig up the concave portion 13. However, it is not limited to such a shape as long as the above-mentioned relationship of friction coefficient is satisfied. In the removal step of step S3, the size and arrangement interval of the convex portion 23 and the like of the mold 2 are adjusted so that the mixture layer 12 does not peel off from the current collector 11.

As described above, FIG. 1 illustrates a low density layer 15 having a low density in a portion of the recess 13 that includes at least a portion thereof. In FIG. 6, as an example of the low-density layer 15, the low-density layer 15a in the vicinity of the opening of the recess 13 is shown.

As illustrated in the low-density layer 15a, the density of the active material in the surface layer of the concave portion 13 and the convex portion 14 in the vicinity of the opening is the mixture layer of the portion where the concave portion 13 and the convex portion 14 are not provided. It is preferable that the density is lower than the density of the active material inside the twelve. In particular, the convex portion 14 formed in the vicinity of the opening is a portion where the current is most likely to be concentrated due to its shape, but by arranging such a low-density layer 15a, in the vicinity of such an opening. Current concentration can be suppressed. Further, by using the electrode plate 1 on which such a low density layer 15b is arranged as a negative electrode of a lithium ion secondary battery, it is possible to facilitate the diffusion of lithium ions and suppress an increase in current density, and to withstand lithium precipitation. Can be improved.

Further, in FIG. 6, as an example of the low-density layer 15, the low-density layer 15b of the surface layer of the recess 13 (the surface side of the recess 13) is shown. As illustrated in the low density layer 15b, the density of the active material in the surface layer of the concave portion 13 may be smaller than the density of the active material in the mixture layer 12 in the portion where the concave portion 13 and the convex portion 14 are not provided. preferable. As a result, the current concentration can be suppressed for the entire surface layer of the recess 13. Further, by using the electrode plate 1 on which such a low density layer 15b is arranged as a negative electrode of a lithium ion secondary battery, it is possible to facilitate the diffusion of lithium ions and suppress an increase in current density, and to withstand lithium precipitation. Can be improved.

Although the boundary between the low-density layers 15a and 15b is not particularly specified, it is possible to have a portion (particularly the surface layer near the opening of the recess 13) where the regions can be said to overlap between the low-density layer 15a and the low-density layer 15b.

Further, the processing speed (insertion speed) in step S2 is preferably high because the active material layer is destroyed to some extent so as to facilitate scraping of the active material. This makes it possible to further reduce the density of the low-density layers 15a and 15b.

Further, the processes of steps S2 and S3 can be repeated twice or more. At that time, the pressing force can be gradually increased. As a result, the mixture scraped out around the opening when the concave portion 13 is formed can be used as the material of the convex portion 14.

The results of testing the density and diffusion resistance of the active material in the electrode plate 1 manufactured in this manner will be described with reference to FIGS. 7 and 8. FIG. 7 is a diagram showing a test example of the density difference of the active material between the inside of the mixture layer 12 and the periphery of the recess 13 in the electrode plate 1 manufactured by the manufacturing method of FIG. FIG. 8 is a diagram showing a test example of the diffusion resistivity ratio between the inside of the mixture layer 12 and the periphery of the recess 13 in the electrode plate 1 manufactured by the manufacturing method of FIG.

The test results shown in FIGS. 7 and 8 are the results of manufacturing the electrode plate 1 as a negative electrode for a lithium ion secondary battery, using graphite as an active material, and setting the binding force of the mixture in the mixture layer 12 to 5 N /. m, the result of performing the density of the active material before processing at 2.000 g / cc. Further, this result is a result of performing only once without repeating steps S2 and S3.

In the region of the mixture layer 12 where the concave portion 13 and the convex portion 14 are not formed (and the region where the concave portion 13 and the convex portion 14 are formed but do not correspond to the surface layer), the density of the active material (graphite) is the same as that before processing. It is 000 g / cc. FIG. 7 shows this as an internal result. On the other hand, the density of the active material (graphite) in the low-density layers 15a and 15b formed by processing was 1.875 g / cc as shown as a result around the recess in FIG. 7. As a result of such a decrease in density, the number of flow paths of the electrolytic solution increases, and as shown in FIG. 8, the ratio of diffusion resistance (internal diffusion resistance / diffusion resistance around the recess) becomes about 74%, and the diffusion resistance is large. lowered. Since the decrease in the diffusion resistance means that the diffusion path of the electrolytic solution has increased, it is indicated that the concentration of the current density around the recess can be reduced by this embodiment.

Further, in the test results shown in FIGS. 7 and 8, the binding force of the mixture in the mixture layer 12 was set to a value smaller than 5 N / m, and the density before processing was set to a range of 1 g / cc or more and less than 2 g / cc. However, similar results were obtained. Further, in this test example, an active material other than graphite was used, but similar results were obtained with an active material having a low density such as graphite.

As described above, in the electrode plate manufacturing method according to the present embodiment, since the mixture layer 12 containing the active material can be formed so as to have the above-mentioned density difference, the mixture layer 12 is provided on the surface of the mixture layer 12. It is possible to manufacture the electrode plate 1 capable of suppressing the current concentration in the vicinity of the recess 13. Further, by manufacturing a non-aqueous secondary battery by using such an electrode plate 1 for one of the positive electrode and the negative electrode, it is possible to suppress the concentration of electric resistance in the vicinity of the recess 13 of the mixture layer 12, and electrochemical. It is possible to manufacture a non-aqueous secondary battery for homogenizing the reaction.

(Other embodiments, etc.)
The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit. For example, the shape, size, material (material), etc. of each member described in the embodiment, or the manufacturing method is not limited to the examples, and the function as a electrode plate for a non-aqueous secondary battery or a non-aqueous secondary battery can be obtained. Any method can be used as long as it can be used, or a plate for a non-aqueous secondary battery or a non-aqueous secondary battery can be manufactured. In addition, the present invention may be carried out by appropriately combining the examples in the embodiments.

1 Plate for non-water secondary batteries (plate)
2 Mold 11 Current collector 12 Mixture layer 13 Recess 14 Convex part 15 Low density layer 15a Low density layer near the opening 15b Low density layer on the surface of the recess 21 Flat part of the mold 23 Convex part of the mold 23b Mold Convex part on the surface of the convex part 23c Convex part on the surface of the mold 24 Concave part on the surface of the mold

Claims (7)

With the current collector
A mixture layer containing at least an active material provided on the surface of the current collector, and
With
The surface layer of the mixture layer has a concave portion and a convex portion, and has a concave portion and a convex portion.
The convex portion is located around the opening of the concave portion, and the convex portion is located around the opening of the concave portion.
The density of the active material in at least a part of the recess is smaller than the density of the active material inside the mixture layer in the recess and the portion where the protrusion is not provided.
Plate for non-water secondary batteries. The density of the active material in the surface layer of the concave portion and the convex portion in the vicinity of the opening is the density of the active material in the mixture layer in the portion where the concave portion and the convex portion are not provided. Smaller
The electrode plate for a non-aqueous secondary battery according to claim 1. The density of the active material in the surface layer of the concave portion is smaller than the density of the active material in the inside of the mixed material layer in the portion where the concave portion and the convex portion are not provided.
The electrode plate for a non-aqueous secondary battery according to claim 1 or 2. The electrode plate for a non-aqueous secondary battery is an electrode plate for a negative electrode.
The electrode plate for a non-aqueous secondary battery according to any one of claims 1 to 3. A non-aqueous secondary battery using the electrode plate for a non-aqueous secondary battery according to claim 4 as a negative electrode. A non-aqueous secondary battery in which the electrode plate for a non-aqueous secondary battery according to any one of claims 1 to 3 is used as at least one electrode plate of a negative electrode and a positive electrode. It is a plate manufacturing method for manufacturing a electrode plate for a non-aqueous secondary battery.
A forming step of forming a mixture layer containing at least an active material on the surface of a current collector,
A pressing step of forming concave portions and convex portions on the surface layer of the mixed material layer by pressing the surface of the mixed material layer using a mold having convex portions and concave portions.
The removal step of removing the mold from the mixture layer and
With
The concave portion of the mold is located around the convex portion of the mold.
The convex portion of the mold has a shape in which the friction coefficient in the direction with respect to the mixture layer during the pressing step is smaller than the friction coefficient in the direction with respect to the mixture layer during the removal step.
Plate manufacturing method.

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