JP2019117733A - Manufacturing method of electrode - Google Patents

Abstract

To provide a technique capable of expecting improvement in linearity at the end of an active material layer, in a manufacturing method of an electrode where a metal foil and an active material layer are laminated.SOLUTION: In a manufacturing method for producing an electrode 103 by imprinting pelletized body 101 containing an active material to a metal foil 102, the pelletized body 101 is deposited at a deposition place 5, by rotating an A roll 1 and a B roll 2, in a manufacturing installation 100 including the A roll 1 having a roll part 11 and flanges 12 provided at both ends of the roll part 11 in the axial direction, and the B roll 2 placed adjacently to the A roll 1 in parallel therewith, and having a shorter length in the axial direction than the roll part 11. The face 12a of the flange 12 on the central side in the axial direction faces the end face 2a of the B roll 2 with a prescribed clearance y, and the size of the clearance y is set in such a range that the flange 12 and the B roll 2 do not touch during rotation of each roll, and is less than or equal to four times of the average grain size d of the active material contained in the pelletized body 101.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manufacturing method of manufacturing an electrode in which a metal foil and a layer of an active material are laminated by transferring an active material which is a granule containing an active material to a strip-shaped metal foil.

  Conventionally, for example, in a lithium ion secondary battery, a sheet-like electrode in which an active material layer is formed on the surface of a metal foil is used. As a document which disclosed the manufacturing method of a sheet-like electrode, there exists patent document 1, for example. In Patent Document 1, a powder material containing an electrode active material is mixed with a small amount of a solvent to form a wet granulated body, and the wet granulated body is formed into a film by passing through a gap between two rolls, A manufacturing method is disclosed which is applied to a strip of current collector foil. Furthermore, in Patent Document 1, as an apparatus for forming a wet granulated body into a film shape, a film forming apparatus provided with partition plates for regulating a space for containing the wet granulated body at both axial ends of two rolls. Is disclosed.

JP, 2017-157495, A

  However, in the technique disclosed in the above-mentioned Patent Document 1, the partition plate is fixed to a frame or the like and is stationary even when the roll rotates. Therefore, the flow velocity of the wet granulate supplied between the rolls by the rotation of the rolls tends to be slower at the axial ends of the rolls in the vicinity of the partition plate as compared to the axial center of the rolls. there were. At a portion where the flow velocity is low, the amount of wet granulated material supplied may be small compared to a portion where the flow rate is high, and there is a problem that the end portion of the active material layer is easily uneven in the width direction of the electrode.

  The present invention has been made to solve the problems of the above-described prior art. That is, the object of the present invention is to provide a method for manufacturing an electrode in which a metal foil and an active material layer are laminated, and which can be expected to improve the linearity of the end portion of the active material layer. .

  The manufacturing method of the electrode in one aspect of the present invention made for the purpose of solving this subject manufactures an electrode which manufactures an electrode by transferring active material material which is a granular object containing an active material to beltlike metallic foil. A first roll having a roll portion, and ridged portions provided at both axial ends of the roll portion and having a diameter larger than that of the roll portion, and parallel to and adjacent to the first roll And rotating the first roll and the second roll using a manufacturing apparatus including a second roll disposed in the second roll and having a length in the axial direction shorter than that of the roll portion of the first roll. Thus, the active material material supplied between the roll portion of the first roll and the second roll is moved through the roll gap portion where the roll portion and the second roll face each other. By causing the first A film forming step of forming a film of the active material on one surface of the second roll and the second roll, and a surface on the central side in the axial direction of the ridge portion is in the axial direction of the second roll The clearance is set such that the ridge portion does not contact the second roll when the first roll and the second roll rotate, and the clearance It is set in the range which is 4 times or less of the average particle diameter of the said active material contained in an active material material.

  The manufacturing method of the electrode in the above-mentioned one mode includes the film-forming process of crushing the granulated body containing an active material with a 1st roll and a 2nd roll, and shape | molding in a film form. The manufacturing apparatus used in the film forming step has, at both ends of the roll portion of the first roll, a collar portion larger in diameter than the roll portion and facing the end face of the second roll. At the closest position between the outer surface of one roll and the outer surface of the second roll, both axial ends are separated by the ridges. And since the ridge portion rotates with the first roll, the granules in the vicinity of the ridge portion also move easily, and the difference in the flow velocity of the granules between the central portion and the end portion in the axial direction of the roll is small. Furthermore, a clearance is provided between the ridge and the end face of the second roll, and this clearance is not more than 4 times the average particle diameter of the active material even when each roll is rotated. The possibility of part of the granules leaking out from the end face of the second roll is small. Therefore, in the axial direction of the roll, unevenness in the supply amount of the granulated body is suppressed, and the linearity of the active material layer at the end in the width direction of the electrode is improved.

  According to the present invention, a method of manufacturing an electrode in which a metal foil and an active material layer are laminated, which can be expected to improve the linearity of the end portion of the active material layer, is realized.

It is a schematic block diagram which shows the manufacturing apparatus of this form. It is explanatory drawing which shows the positional relationship of A roll and B roll. It is explanatory drawing which shows the example which measures the position of an end surface. It is explanatory drawing which shows a buttocks part. It is explanatory drawing which shows a buttocks part. It is process drawing which shows the manufacturing method of the electrode by the manufacturing apparatus of this form. It is the graph which compared the unevenness | corrugation of the edge part of the electrode by an Example and a comparative example. It is explanatory drawing which shows the example which provided the collar part in B roll.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In the present embodiment, the present invention is applied to a method of manufacturing a strip-shaped electrode.

  The manufacturing apparatus 100 which manufactures an electrode by the manufacturing method of this form is equipped with A roll 1, B roll 2, C roll 3, and the auxiliary plate 4, as schematic structure is shown in FIG. The A roll 1 is an example of a first roll, and the B roll 2 is an example of a second roll. The manufacturing apparatus 100 according to the present embodiment uses, for example, a lithium ion secondary battery by transferring the granules 101, which is an active material containing an active material, to the metal foil 102 using three rolls 1 to 3. It is an apparatus for manufacturing the strip-like electrode 103 to be used.

  The granulated body 101 is a powder obtained by adding a solvent such as a small amount of water to a powder containing an electrode active material and a binder to obtain a wet state, and granulating it into a substantially spherical shape by stirring. When manufacturing the electrode 103 used for a lithium ion secondary battery, the electrode active material for the positive electrode is, for example, a lithium-containing metal oxide capable of inserting and extracting lithium ions, and the electrode active material for the negative electrode is, for example, And carbon-based materials such as graphite. The powder may contain a thickener in addition to the electrode active material. For example, the electrode active material for the negative electrode is a powder having a diameter of 5 to 11 μm, and the granules 101 for the negative electrode are, for example, particles having a diameter of 0.5 to 4 mm. Moreover, as the granulated body 101, you may use what, for example with the sieve etc., made the particle | grain size equal to some extent.

  The metal foil 102 is, for example, a strip-like metal foil having a thickness of 8 to 20 μm, and an aluminum foil is used when manufacturing the positive electrode and a copper foil is used when manufacturing the negative electrode. The metal foil 102 is unwound from a supply roll or the like (not shown) and supplied to the manufacturing apparatus 100.

  As shown in FIG. 1, the A-roll 1, the B-roll 2 and the C-roll 3 are arranged such that the rotation axes are parallel to each other. The A roll 1 and the B roll 2 are disposed adjacent to and in parallel with each other, and the B roll 2 and the C roll 3 are disposed adjacent to each other in parallel. A roll 1 and C roll 3 are not adjacent to each other. The arrangement of the three rolls 1 to 3 is not limited to the example shown in FIG. 1 and, for example, three rolls may be vertically or horizontally arranged.

  In the manufacturing apparatus 100 of the present embodiment, as shown in FIGS. 1 and 2, the A-roll 1 includes a roll 11 and ridges 12 provided at both ends of the roll 11. In addition, FIG. 2 is the figure which looked at the state without the granulated body 101 from the upper direction in FIG. The roll portion 11 of the A roll 1 is a portion facing the B roll 2. The length of the roll portion 11 in the roll axial direction is longer than the length of the B roll 2 in the roll axial direction. And both ends of roll part 11 are arranged outside the both ends of B roll 2 in the roll axial direction. Further, the ridges 12 are provided at both ends in the roll axis direction of the roll portion 11 and are disk-shaped portions having a diameter larger than that of the roll portion 11.

  As shown in FIGS. 1 and 2, the diameter of the roll portion 11 of the A-roll 1 is smaller than the diameter of the B-roll 2. The diameter of B roll 2 is smaller than the diameter of C roll 3. The A roll 1 and the B roll 2 are adjacent to each other at the film forming portion 5 where the outer peripheral surfaces are closest to each other, for example, with a gap of 60 to 400 μm. The film formation location 5 is an example of a roll gap location. The distance between the A roll 1 and the B roll 2 at the film forming location 5 is smaller than the average particle diameter of the granulated body 101 and larger than the average particle diameter of the active material contained in the granulated body 101. In addition, the B roll 2 and the C roll 3 are adjacent to each other by providing a gap of, for example, 10 to 200 μm at a portion where the outer peripheral surfaces are closest to each other. The gap between the B roll 2 and the C roll 3 is smaller than the film formation location 5.

  Further, as shown in FIGS. 1 and 2, the auxiliary plate 4 is located above the ridge 12 of the A-roll 1 in FIG. 1 at both ends in the roll axial direction of the A-roll 1 and B-roll 2. , B roll 2 is disposed outside in the axial direction. The auxiliary plate 4 is fixed to a frame or the like (not shown) and does not move at the time of manufacturing the electrode. And at the time of manufacture of the electrode by the manufacturing apparatus 100 of this form, for example, the granule 101 supplied from a hopper etc. is upper part in FIG. 1 of A roll 1 and B roll 2, and is auxiliary plate 4 of both sides. Housed in the range between.

  The A-roll 1, the B-roll 2 and the C-roll 3 are connected to motors (not shown) that rotationally drive them, and are rotated at a predetermined rotational speed when manufacturing the electrodes. In addition, a motor may be common to each roll 1-3, or may be separate. The rotational direction of each of the rolls 1 to 3 is determined such that the outer peripheral surfaces of the two adjacent rolls move in the same direction at adjacent positions of the two rolls, as shown by the arrows in FIG. . That is, the A-roll 1 and the C-roll 3 are rotated in the same rotational direction, and the B-roll 2 is rotated in the opposite rotational direction to the A-roll 1 and the C-roll 3.

  Specifically, in the manufacturing apparatus 100 of the present embodiment shown in FIG. 1, the outer peripheral surface of each of the portions adjacent to the A roll 1 and the B roll 2 moves downward in the drawing, At the adjacent portion to the C-roll 3, the outer peripheral surface moves in the direction toward the right in the figure. Thereby, as shown in FIG. 1, the granulated body 101 accommodated between the auxiliary plates 4 is compressed by the A roll 1 and the B roll 2 at the film forming location 5 and is formed into a film shape, B It is transferred to the metal foil 102 at a position adjacent to the roll 2 and the C roll 3. The circumferential speed of each roll at the time of manufacture is, for example, the slowest of the three circumferential speeds of the roll portion 11 of the A-roll 1 and the fastest of the three circumferential speeds of the C-roll 3. The diameter of each roll, the length in the axial direction, the size of the gap between the outer peripheral surfaces, the peripheral speed, and the like may be appropriately selected as long as appropriate manufacturing is possible.

  The A roll 1 will be further described. As shown in FIG. 2, since the collar portion 12 of the A roll 1 protrudes in the radial direction at both ends of the roll portion 11, the ridge portion 12 intersects with the location where the B roll 2 is extended in the roll axial direction. Then, a part of the surface 12 a on the center side in the roll axial direction of the ridge portion 12 of the A roll 1 is opposed to the end face 2 a of the B roll 2 with a predetermined clearance y. The clearance y between the ridge 12 and the end face 2 a of the B roll 2 at the opposing portion does not contact the ridge 12 and the B roll 2 even when each roll is rotated, and the ridge 12 and the B roll 2 It is set so that a part of granulated body 101 may not leak from between.

In the manufacturing apparatus 100 of the present embodiment, the clearance y between the surface 12 a of the ridge 12 and the end face 2 a of the B-roll 2 satisfies the following Expression 1 and Expression 2.
Maximum deflection of the B roll 2 in the roll axis direction δ <Clearance at rest y Equation 1
Maximum clearance at the time of rotation y ≦ average particle diameter of active material d × 4 formula 2

  The maximum deflection amount δ of the B roll 2 in the roll axis direction is the maximum value of the movement width of the end face 2 a of the B roll 2 in the roll axis direction when the B roll 2 is rotated. The maximum deflection amount δ is obtained, for example, by measuring with a measuring instrument 22 fixed to a frame 21 or the like outside the apparatus as shown in FIG. That is, while rotating the B-roll 2, the measuring device 22 measures the distance from the measuring device 22 to the end face 2 a of the B-roll 2. The difference between the maximum value and the minimum value of the measured distance is the maximum deflection amount δ of the B-roll 2.

  Then, by making the clearance y at the time of standstill of each roll larger than the maximum deflection amount δ, the contact between the collar portion 12 and the B roll 2 can be suppressed even at the time of rotation of the B roll 2. In the present embodiment, the maximum runout amount δ is measured for each of the end faces 2a on both sides of the B roll 2, and the clearances y on both sides are set.

  Further, as shown in FIG. 3, it is further preferable to measure the maximum deflection amount of the surface 12 a of the ridge portion 12. That is, when the A-roll 1 is rotated, the distance between the measuring instrument 23 and the surface 12 a is measured using the measuring instrument 23 fixed to the frame 21. The difference between the maximum and the minimum of the measured distance is the maximum deflection of the surface 12a. Then, if the clearance y at the time of stationary is made larger than the sum of the maximum deflection amount δ of the B-roll 2 and the maximum deflection amount of the surface 12a, the contact can be suppressed more reliably.

  Moreover, in the manufacturing apparatus 100 of this form, as mentioned above, what granulated the powder material containing an electrode active material is used as the granulation body 101. As shown in FIG. In the granulated body 101, since there is a tendency for the powder materials contained to be aggregated, for example, it is easy even if there is a gap if it is a gap having a size slightly larger than the average particle diameter of the active material contained as the material Does not leak out. Therefore, by appropriately selecting the clearance y, the structure is formed between the roll portion 11 of the A roll 1 and the B roll 2 and the ridge portions 12 on both sides immediately above the film forming portion 5 even during rotation of each roll. The particles 101 can be held. In other words, the clearance y is provided in a range where the granulated body 101 can be held in the clearance y.

  In the granulated body 101 used in this embodiment, for example, water is added to a graphite powder having an average particle diameter of 5 to 11 μm and a thickener and the mixture is kneaded, and the ratio of solid content in the material is 70 to 80% The particles are 0.5 to 4 mm in diameter. It has been confirmed by experiment that, in the case of a gap of 4 times or less of the average particle diameter d of the active material, for example, the granulated body 101 hardly leaks out even if a pressure in the direction toward the gap is applied. Then, the granulated body 101 can be hold | maintained between the collar part 12 and B roll 2 by making the clearance y at the time of rotation of each roll not be larger than 4 times the average particle diameter d of an active material.

  Furthermore, in the manufacturing apparatus 100 according to the present embodiment, as shown in FIGS. 4 and 5, the ridge portion 12 of the A-roll 1 includes three ring members 121A, 121B, 121C and three shims divided in the circumferential direction. 122A, 122B, 122C. In FIG. 4, A roll 1 of the XX cross section of FIG. 5 is shown.

  Each of the ring members 121A, 121B, and 121C is a fan-shaped, substantially plate-like member having an inner angle of 120 °, and when three ring members are combined, it becomes a lid covering the end face 11a of the roll portion 11 of the A roll 1. The shims 122A, 122B, 122C are substantially plate-like members disposed between the ring members 121A, 121B, 121C and the end surface 11a. Each ring member 121A, 121B, 121C is screwed to the roll portion 11 by a bolt 123, and the shims 122A, 122B, 122C are fixed by being sandwiched between the corresponding ring member and the roll portion 11. ing. In the following, the subscripts of A, B, and C will be omitted unless distinction is necessary.

  The A-roll 1 of this embodiment can be realized by attaching the collar portion 12 formed of the three ring members 121 to the roll portion 11, that is, the A-roll without the ridge portion used in the conventional manufacturing apparatus. . The distance between the ring member 121 and the end face 11 a of the roll portion 11 can be changed by replacing the shim 122 with one having a different thickness. That is, by appropriately selecting the thickness of the shim 122, the clearance y which satisfies the above-described condition can be easily realized. For example, even if the range of appropriate clearance y is different at both ends of the A-roll 1, different shims 122 may be used, and the same kind of ring member 121 can be used.

  And, the actual clearance y can be measured by a skimmer gauge. For example, a skimmer gauge is inserted between the surface 12a of the collar 12 and the end face 2a of the B-roll 2, and it is confirmed that the clearance y satisfies the condition described above. Furthermore, it is good to rotate A roll 1 and B roll 2 little by little, and to measure in multiple places.

  The auxiliary plate 4 is not provided at the film forming location 5 as shown in FIG. That is, the pressure due to the rotation of each roll is not applied to the granulated body 101 accommodated between the auxiliary plates 4. Therefore, the distance between the auxiliary plate 4 and the B roll 2 may be smaller than the particle diameter of the granulated body 101. The particle size of the granulated body 101 is, for example, 40 to 800 times the particle size of the active material contained in the granulated body 101, as described above. Therefore, as shown in FIG. 2, the distance between the auxiliary plate 4 and the end face 2 a of the B-roll 2 is larger than the clearance y.

  Then, the method to manufacture the electrode 103 in the manufacturing apparatus 100 of this form is demonstrated with reference to FIG. In the manufacturing method of this embodiment, first, the granulated body 101 and the metal foil 102 are prepared, the granulated body 101 is accommodated between the auxiliary plates 4, and the metal foil 102 is wound around the outer periphery of the C roll 3. And (preparation process). In addition, the shim 122 and the ring member 121 appropriately selected are attached to the A-roll 1.

  Thereafter, as shown in FIG. 1, the A-roll 1, the B-roll 2 and the C-roll 3 are each rotated at a predetermined rotational speed. The granulated body 101 accommodated between the auxiliary plates 4 moves as the outer periphery of the roll portion 11 of the A roll 1 and the outer periphery of the B roll 2 move, and passes through the film forming location 5. Thereby, a film of the granules 101 is formed on the surface of the B-roll 2 (film forming step).

  At this time, since the ridges 12 are provided at both ends of the A roll 1 and the ridges 12 rotate with the roll 11 at the same angular velocity in the same direction, the film forming portion 5 near the both ends in the roll axial direction The granules 101 move at almost the same speed as the granules 101 near the center. That is, the difference in the flow velocity of the granulated body 101 with respect to the position in the roll axial direction is suppressed. Therefore, the amount of supply of the granules 101 to the film forming portion 5 is suppressed in the roll axial direction, and is a sufficient amount over the entire roll axial direction.

  Furthermore, as shown in FIG. 1, the granules 101 formed into a film between the A roll 1 and the B roll 2 adhere to the outer peripheral surface of the B roll 2 and move, and the B roll 2 and the C roll And the metal foil 102 wound around the outer periphery of the C roll 3 (transfer step). Thereby, the electrode 103 in which the granules 101 are stacked on the metal foil 102 is manufactured. The step of manufacturing the electrode 103 may further include a step of drying the electrode 103.

  In the manufacturing apparatus 100 of the present embodiment, the B roll 2 is more than the gap (the gap at the time of film formation) of the film forming portion 5 which is the closest position between the outer peripheral surface of the roll portion 11 of the A roll 1 and the outer peripheral surface of the B roll 2 The gap at the closest position between the outer peripheral surface of the roller and the outer peripheral surface of the C-roll 3 (gap at the time of transfer) is smaller. Therefore, the granules 101 formed into a film shape between the A roll 1 and the B roll 2 are further spread at the position of the gap at the time of transfer. According to this embodiment, since the film-like granulated body 101 formed in the film forming step has a sufficient amount to both ends in the roll axis direction, both ends in the width direction also in the electrode 103 after transfer. The active material layer is properly formed up to the part. Therefore, the unevenness of the end portion of the active material layer is suppressed.

  About the electrode of the Example manufactured using the manufacturing apparatus 100 of this form, and the electrode of the comparative example manufactured using the manufacturing apparatus which has an A roll without a ridge and a fixed partition plate The result of measuring the unevenness of the end portion is shown in FIG. In this example, the granules 101 containing an active material having an average particle diameter of 10 μm were formed using the manufacturing apparatus 100 with the clearance y set to 40 μm.

  As shown in FIG. 7, the unevenness of the end portion in the width direction of the electrode was about 0.5 mm in the example and about 2.0 mm in the comparative example. Also from this result, it was confirmed that the unevenness of the end was suppressed and the linearity was improved.

  Moreover, in the manufacturing apparatus 100 of this form, the clearance y is provided between the ridge 12 and the end face 2 a of the B-roll 2. For example, even when the clearance y is not provided and the ridge 12 is pressed against the end face 2a to be in close contact, it is estimated that the granular body 101 at the end can be moved without leakage to suppress unevenness of the end of the electrode Be done. However, in the case of pressing and bringing into close contact, it is preferable that the collar portion be made of resin, and wear due to sliding occurs in the resin collar portion. For example, when a 1000 m electrode is continuously manufactured using a manufacturing apparatus in which a resin ridge portion is in close contact with the end face 2a of the B roll 2, wear of approximately 0.5 mm is estimated to occur in the ridge portion Ru. Therefore, it is estimated that the lifetime of the closely-contacted buttocks will be exhausted by manufacture of an electrode of about 300 m, for example. In other words, there is a need to frequently replace the buttocks.

  In the manufacturing apparatus 100 of the present embodiment, since the clearance y is provided between the ridge 12 and the end face 2 a of the B-roll 2, it is not in contact and hardly wears regardless of the material of the ridge 12. Therefore, it is assumed that the life of the collar portion 12 is long, for example, it is not necessary to replace the collar portion 12 even if an electrode of 1,000,000 m or more is manufactured.

  As described above in detail, according to the method of manufacturing an electrode of the present embodiment, the granulated body 101 is formed into a film shape between the A roll 1 and the B roll 2. In the manufacturing apparatus 100 of the present embodiment, since the ridges 12 are provided on the A-roll 1, the granules 101 in the vicinity of the ridges 12 are also in the central portion in the roll axial direction as the respective rolls rotate. It is easy to move in the same manner as the granulated body 101. Therefore, the unevenness of the flow velocity in the roll axial direction and the partial decrease of the supply amount can be suppressed, and film formation with uniform film thickness up to the end can be expected. Thereby, the unevenness | corrugation of the edge part of the width direction of the active material layer of the electrode 103 by which the active material layer was laminated | stacked on the metal foil 102 is suppressed, and the improvement of the linearity of an active material layer can be anticipated.

  The present embodiment is merely an example and does not limit the present invention. Therefore, the present invention is naturally capable of various improvements and modifications without departing from the scope of the invention. For example, as long as the present invention is a manufacturing method of forming a sheet-like electrode by forming a layer of granules on a metal foil, it is not limited to electrodes for lithium ion secondary batteries, but manufacturing electrodes of various batteries. Applicable to the method.

  Further, the arrangement of the A roll 1 and the B roll 2 and the arrangement of the B roll 2 and the C roll 3 are not limited to the illustrated example. For example, the arrangement of the A roll 1 and the B roll 2 is not limited to the horizontal direction, and may be vertical or diagonal. Further, for example, the arrangement of the B roll 2 and the C roll 3 is not limited to the vertical direction, and may be arranged in the horizontal direction or may be oblique. Moreover, the diameter of each roll may be the same.

  Although the ring member 121 is attached to both ends of the roll portion 11 as the A-roll 1 in this embodiment, a roll in which the roll portion 11 and the collar portion 12 are integrated may be used. Further, although the ring member 121 is illustrated as being divided into three, it may be divided into two or four or more, and may not be divided.

  In the embodiment, the clearance y is set according to the thickness of the shim 122. However, the present invention is not limited to this. For example, the clearance y may be adjusted according to the thickness of the ring member 121 itself. That is, the shim 122 may be absent. However, by using the shim 122, adjustment of the clearance y is easy.

  Further, in the present embodiment, although the ridge portion 12 is provided on the A roll 1, the present invention is not limited to the A roll 1 and may be provided on, for example, the B roll 2. Specifically, for example, as shown in FIG. 8, the B-roll is longer than the A-roll, and the ridges are provided at both ends of the B-roll, and the present embodiment described above clears the clearance between the ridge and the end face of the A-roll. It may be set to be the clearance y of.

DESCRIPTION OF SYMBOLS 1 A roll 2 B roll 11 roll part 12 ridge part 100 manufacturing apparatus 101 granulated body 102 metal foil 103 electrode

Claims (1)

A method for producing an electrode, comprising producing an electrode by transferring an active material material, which is a granule containing an active material, to a strip-like metal foil,
A first roll having a roll portion, and ridged end portions provided at both axial end portions of the roll portion and having a diameter larger than that of the roll portion;
A second roll disposed adjacent to and in parallel with the first roll and having a shorter axial length than the roll portion of the first roll;
Using a manufacturing apparatus equipped with
The active material material supplied between the roll portion of the first roll and the second roll by rotating the first roll and the second roll is the roll portion and the second roll. And a film forming step of forming a film of the active material on any one surface of the first roll and the second roll by moving through a roll gap portion where the ,
The axial center side surface of the flange portion is opposed to the axial end surface of the second roll with a predetermined clearance provided.
As for the size of the clearance, when the first roll and the second roll rotate, the ridge portion and the second roll do not contact, and the average particle size of the active material contained in the active material material is determined. It is set within the range of 4 times or less of the diameter,
The manufacturing method of the electrode characterized by the above.

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