Electrode manufacturing device and electrode manufacturing method

Abstract

To provide an electrode manufacturing device and an electrode manufacturing method capable of improving a degree of orientation of an active material in a paste.SOLUTION: An electrode manufacturing device 1 includes a coating unit 10 for coating a current collector 2 with paste 5 while applying shear to the paste 5 between a conveying roll 3 for conveying the current collector 2 and a facing member 4 arranged facing the conveying roll 3. The coating unit 10 has a magnetic field application unit 16 for applying a magnetic field for orienting an active material contained in the paste 5 to a generation portion Ea of the shear of the paste 5 at least one of during coating and before coating of the paste 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electrode manufacturing apparatus for manufacturing an electrode sheet and an electrode manufacturing method.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1, a method for manufacturing an electrode for a battery is well known in which an electrode mixture powder obtained by granulating an electrode mixture is supplied in a current collector foil shape and pressed. Patent Document 1 describes that graphite in the powder is oriented by granulating the electrode mixture powder while applying a magnetic field to the electrode mixture. Further, Patent Document 1 describes that after supplying the electrode mixture powder onto the current collector foil, a magnetic field is applied to the current collector foil before pressing to orient the granulated particles.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 describes applying a magnetic field to the electrode material to improve the degree of orientation of the material, but the improvement in the degree of orientation is not sufficient with the described method. Therefore, when using a method of applying a magnetic field to the electrode material to improve the degree of orientation, it has been desired to develop a technique capable of improving the degree of orientation more than the method described in Patent Document 1.

[0005] An object of the present invention is to provide an electrode manufacturing apparatus and an electrode manufacturing method capable of improving the degree of orientation of the active material in the paste.

Means for Solving the Problems

[0006] The electrode manufacturing apparatus for solving the above problems is an apparatus for manufacturing an electrode sheet of a battery by applying a paste of an electrode mixture to a current collector, and includes a conveying roll for conveying the current collector and an opposing member disposed opposite to the conveying roll, and a coating unit for applying the paste to the current collector while applying shear to the paste between the conveying roll and the opposing member. The coating unit includes a magnetic field applying unit for applying a magnetic field for orienting an active material contained in the paste to a site where shear of the paste occurs at at least one of the time of and before applying the paste.

[0007] The electrode manufacturing method for solving the above problems is a method for manufacturing an electrode sheet of a battery by using a coating unit having a conveying roll for conveying a current collector and an opposing member disposed opposite to the conveying roll, and applying the paste to the current collector while applying shear to the paste of the electrode mixture between the conveying roll and the opposing member. A magnetic field applying unit is provided in the coating unit, and a magnetic field for orienting an active material contained in the paste is applied from the magnetic field applying unit to a site where shear of the paste occurs at at least one of the time of and before applying the paste.

Advantages of the Invention

[0008] The present invention can improve the degree of orientation of the active material in the paste.

Brief Description of the Drawings

[0009]

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Mode for Carrying Out the Invention

[0010] (First Embodiment) Hereinafter, a first embodiment of the present disclosure will be described. (Electrode Manufacturing Apparatus 1) As shown in FIG. 1, the electrode manufacturing apparatus 1 includes a transport roll 3 that transports a current collector 2 used in a battery, and an opposing member 4 disposed opposite to the transport roll 3. The transport roll 3 rotates in a direction (the direction of arrow A1 in FIG. 1) that sends the current collector 2 downstream by a drive source such as a motor (not shown). The electrode manufacturing apparatus 1 manufactures an electrode sheet 6 of a battery by applying a paste 5 of an electrode composite material to the current collector 2. Specifically, the electrode manufacturing apparatus 1 forms a layer of the electrode composite material on the surface of the current collector 2 by wet coating in which the paste 5 of the electrode composite material is applied to the current collector 2 and dried or cured. The battery is, for example, a secondary battery (lithium ion battery).

[0011] The electrode sheet 6 manufactured by the electrode manufacturing apparatus 1 is, for example, a negative electrode sheet. In this case, the electrode mixture is a negative electrode mixture. The material of the paste 5 of the negative electrode electrode includes, for example, a negative electrode active material and a negative electrode additive. The negative electrode active material is composed of, for example, a material capable of occluding and releasing lithium ions, and a powdery carbon material made of, for example, graphite (graphite) or the like is used. The negative electrode additive includes, for example, a negative electrode solvent, a negative electrode binder, and a negative electrode thickener. The current collector 2 is a base material of the current collector 2 such as a current collecting foil, and is, for example, a copper foil.

[0012] (Coating section 10) As shown in FIGS. 1 and 2, the electrode manufacturing apparatus 1 includes a coating section 10 that coats the current collector 2 with the paste 5 of the electrode mixture. In the case of this example, the coating section 10 coats the current collector 2 with the paste 5 while applying shear to the paste 5 between the conveying roll 3 and the opposing member 4. In the coating section 10, for example, in order to smooth the surface of the paste 5, the paste 5 is applied to the current collector 2 while applying shear to the paste 5.

[0013] (Comma coater 11) As shown in FIGS. 1 and 2, the coating section 10 is a comma coater 11 that uses a comma roll 12 as the opposing member 4. As shown in FIG. 2, the comma roll 12 is in a stationary state and is arranged to face parallel to the conveying roll 3 that conveys the current collector 2 by rotation. The comma roll 12 has a blade portion 13 at a position facing the conveying roll 3. The comma coater 11 applies the paste 5 in the storage portion 14 arranged at the boundary between the conveying roll 3 and the opposing member 4 to the current collector 2. The comma coater 11 applies the paste 5 to the current collector 2 while scraping off the unnecessary paste 5 with the comma roll 12.

[0014] (Magnetic field applying section 16) As shown in FIG. 1, the coating section 10 has a magnetic field application section 16 that applies a magnetic field to the paste 5 applied to the current collector 2. In the case of this example, the magnetic field application section 16 includes a first magnetic field application section 17 provided on the opposing member 4 and a second magnetic field application section 18 provided on the conveying roll 3. The magnetic field application section 16 applies a magnetic field for orienting the active material 19 (shown in FIG. 6) contained in the paste 5 to the shear generation site Ea of the paste 5 at at least one of the time of and before coating the paste 5.

[0015] The first magnetic field application section 17 is, for example, a magnet piece 20 disposed at the tip position closest to the conveying roll 3 on the opposing member 4. When the opposing member 4 is the comma roll 12, the magnet piece 20 is attached to the blade portion 13 of the comma roll 12, specifically, the blade tip of the blade portion 13. The magnet piece 20 has, for example, the side facing the conveying roll 3 as the "S pole" and the opposite side as the "N pole". Thus, the magnet piece 20 has a magnetic pole orientation inward in the radial direction of the comma roll 12. The magnet piece 20 has, for example, a shape extending along the longitudinal direction of the opposing member 4. The comma roll 12 applies a shearing force to the paste 5 by the tip of the magnet piece 20.

[0016] The second magnetic field application section 18 is, for example, the conveying roll 3 formed of a magnet. That is, in the case of this example, since the conveying roll 3 is formed of a magnet, the conveying roll 3 itself is the second magnetic field application section 18. The conveying roll 3 has, for example, the surface side as the "N pole" and the opposite side as the "S pole". Thus, the conveying roll 3 has, for example, a magnetic pole orientation outward in the radial direction of the conveying roll 3.

[0017] Next, the operation of the electrode manufacturing apparatus 1 (electrode manufacturing method) of this embodiment will be described. (Flow of the coating process) As shown in FIGS. 1 and 2, when applying the paste 5 to the current collector 2, the current collector 2 is wound up in the conveying direction (the direction of arrow B1 in FIG. 2) by the conveying roll 3 and passes between the conveying roll 3 and the opposing member 4. Note that if the distance between the conveying roll 3 and the opposing member 4 is too narrow, the paste 5 cannot pass through and overflows to the upstream side. Conversely, if it is too wide, sufficient shearing force cannot be applied to the paste 5. Therefore, the distance between the conveying roll 3 and the opposing member 4 is preferably set to an optimal value such that the paste 5 does not overflow upstream and sufficient shearing force can be applied to the paste 5.

[0018] FIG. 3 shows the shearing force applied to the paste 5 from the coating section 10. In this figure, the strength of the shearing force generated by the paste 5 is represented by the darkness of the dots. The darker the dots, the higher the shearing force, and the lighter the dots, the lower the shearing force. The coating section 10 applies the paste 5 to the current collector 2 while applying a shearing force to the paste 5. For this reason, the shearing force generated in the paste 5 is higher before being applied to the current collector 2 (including before and during application) than after being applied to the current collector 2. Therefore, in the coating section 10 of this example, a magnetic field is applied by the magnetic field applying section 16 to the shearing generation site Ea of the paste 5 before and during the application of the paste 5.

[0019] As shown in FIG. 4, in the case of this example, since the conveying roll 3 is formed by a magnet, a magnetic field is applied to the paste 5 by the magnetized conveying roll 3 before being applied to the current collector 2. Specifically, before applying the paste 5, a magnetic field is applied from the conveying roll 3 to the shearing generation site Ea of the paste 5. In the case of this example, a magnetic field having a magnetic pole orientation in a direction perpendicular to the tangent of the outer peripheral surface of the conveying roll 3 is applied to the paste 5 from the magnetized conveying roll 3.

[0020] As shown in Fig. 5, in this example, since the magnet piece 20 is provided on the opposing member 4, a magnetic field is applied to the paste 5 from the magnet piece 20 during the application of the paste 5 onto the current collector 2. In particular, in this example, since the conveying roll 3 is formed by a magnet, a magnetic field obtained by adding both the conveying roll 3 and the magnet piece 20 is applied to the paste 5. Thus, during the application of the paste 5, a magnetic field is applied to the generation site Ea of the shear of the paste 5 from the conveying roll 3 and the magnet piece 20. Here, a magnetic field having a magnetic pole orientation in a direction perpendicular to the tangent of the outer peripheral surface of the conveying roll 3 is applied to the paste 5 from the conveying roll 3 and the magnet piece 20.

[0021] As described above, in the coating process, the paste 5 is applied to the current collector 2 while a magnetic field is applied to the paste 5 by the first magnetic field applying portion 17 and the second magnetic field applying portion 18. After the coating process, the current collector 2 coated with the paste 5 of the electrode composite material, that is, the electrode sheet 6, proceeds to the drying process. In the drying process, for example, it is passed between heaters by a roller conveyor (not shown), and the paste 5 is heated and dried by hot air. After the drying process, the electrode sheet 6 proceeds to a pressing process in which it is formed into a predetermined thickness by a press machine. Then, the electrode sheet 6 is cut into a predetermined size by a cutting process.

[0022] (Advantages of applying a magnetic field to the paste 5) As shown in Fig. 6, when a shearing force is applied to the paste 5, the paste has a characteristic that the paste viscosity decreases. If the paste viscosity decreases, the active material 19 contained in the paste 5 becomes easier to move. Therefore, if a magnetic field is applied to the paste 5 by the magnetic field applying portion 16 at the timing before and during the application when shearing is applied and the paste viscosity decreases, the active material 19 contained in the solvent 21 of the paste 5 can be easily oriented in an optimal direction. Specifically, by applying a magnetic field to the paste 5, it becomes possible to displace the active material 19 to a standing state. Thus, it becomes possible to improve the degree of orientation of the active material 19 in the paste 5.

[0023] When the degree of orientation of the active material 19 improves, in a lithium-ion battery, the migration resistance of lithium ions is suppressed. Also, the precipitation of lithium ions is suppressed. The migration resistance of lithium ions and the precipitation of lithium are correlated with the input / output characteristics of the lithium-ion battery. That is, if the migration resistance of lithium ions and the precipitation of lithium are suppressed, the input / output characteristics of the lithium-ion battery improve. Therefore, the improvement of the degree of orientation of the active material 19 contributes to the high quality of the battery.

[0024] (Comparison with the prior art) FIG. 7 shows a test image diagram of the conventional electrode manufacturing apparatus 1. The conventional electrode manufacturing apparatus 1 attempts to improve the orientation of the active material 19 in the paste 5, for example, by applying a magnetic field with the magnet member 23 to the paste 5 after coating the paste 5 on the current collector 2. In FIG. 7, the transport position of the paste 5 is shown on the horizontal axis, and the degree of orientation was confirmed when the magnet member 23 was arranged at each of a plurality of positions (in this example, "Pa", "Pb", "Pc").

[0025] Note that the test conditions implemented with the conventional electrode manufacturing apparatus 1 are, for example, a paste viscosity of "12000 [mPa·s] (shear rate 2 [s -1 )", a coating speed of "3.0 [m / min]", a coating basis weight of "4 [mg / cm 2 ", a magnet magnetic flux density of "450 [mT]", and a magnetic field application time of "2.3 [sec]".

[0026] FIG. 8 is a graph showing the change over time of the return rate of the paste viscosity. This graph shows the transition of the paste viscosity after applying high shear (for example, 1000 [s -1 ) to the paste 5 having a paste viscosity of "12000 [mPa·s]", for example. At "0 seconds" when high shear is applied to the paste 5, the paste viscosity takes a very low value of, for example, about "240 [mPa·s]". Then, as shown in the viscosity return rate of the graph, the paste viscosity returns with the passage of time and returns to the original value after about 20 seconds. Thus, it can be seen that the paste viscosity is the lowest during the coating of the paste 5.

[0027] FIG. 9 is a graph showing the relationship between the timing of implementation of the orientation after coating and the degree of orientation. The degree of orientation is the ratio of the number of active materials 19 in the fallen state to the number of active materials 19 in the standing state (fallen number / standing number). Since the number of active materials 19 in the standing state is used as the denominator, a lower value is better. As shown in the figure, the degree of orientation at the time of coating is "about 60", the degree of orientation when the transport position is "Pa" is "about 155", the degree of orientation when the transport position is Pb is "about 200", and the degree of orientation when the transport position is "Pc" is "about 226". Thus, it can be seen that the degree of orientation of the paste 5 deteriorates as time elapses from the coating. From this, it can also be seen that it is most effective to improve the degree of orientation by a magnetic field at the time of coating.

[0028] (Summary) As shown in FIG. 10, when the shear rate of the paste 5 changes from a low state to a high state, the paste viscosity significantly decreases. Also, when the shear rate of the paste 5 changes from a high state to a low state, the paste viscosity gradually returns to the original high state. From this, it can also be seen that it is effective to apply a magnetic field to the paste 5 when a high shear rate is applied to the paste 5 and the paste viscosity is in a low state.

[0029] As shown in FIG. 11, there is a relationship between the paste viscosity and the degree of orientation such that the lower the paste viscosity, the better the degree of orientation of the paste 5. Therefore, by using a material with a low paste viscosity as the paste 5 and taking the measure of applying the magnetic field of this example, it is possible to generate a paste 5 with a higher degree of orientation. Thus, from this as well, it is possible to expect an improvement in the degree of orientation of the active material 19.

[0030] (Effects of the Embodiment) According to the configuration of the above embodiment, the following effects can be obtained. (1-1) The electrode manufacturing apparatus 1 manufactures the electrode sheet 6 of the battery by applying the paste 5 of the electrode composite material to the current collector 2. The electrode manufacturing apparatus 1 includes a coating section 10 that applies the paste 5 to the current collector 2 while applying shear to the paste 5 between the conveyance roll 3 that conveys the current collector 2 and the opposing member 4 disposed opposite to the conveyance roll 3. The coating section 10 has a magnetic field application section 16 that applies a magnetic field for orienting the active material 19 contained in the paste 5 to the generation site Ea of the shear of the paste 5 at least in one of the time during and before the application of the paste 5.

[0031] According to this configuration, when shear is applied to the paste 5 during coating, the paste viscosity decreases. When the paste viscosity decreases, the active material 19 contained in the paste 5 becomes easier to move. Therefore, when shear is applied to the paste 5, if a magnetic field is applied to the paste 5 by the magnetic field application section 16, it becomes easier to align the active material 19 in the paste in a predetermined direction. Thus, the degree of orientation of the active material 19 in the paste can be improved.

[0032] (1-2) The magnetic field application section 16 (in this example, the first magnetic field application section 17) is provided on the opposing member 4, and applies a magnetic field from the opposing member 4 to the paste 5. According to this configuration, it becomes possible to apply a magnetic field from the magnetic field application section 16 to the paste 5 at the timing when the paste 5 is sheared by the opposing member 4. For this reason, it becomes possible to apply a magnetic field to the paste 5 by the magnetic field application section 16 at the optimum timing when strong shear is applied to the paste 5. Thus, it further contributes to the improvement of the degree of orientation of the active material 19 in the paste.

[0033] (1-3) The magnetic field application section 16 (in this example, the first magnetic field application section 17) provided on the opposing member 4 is a magnet piece 20 disposed at the tip position closest to the conveyance roll 3 in the opposing member 4. According to this configuration, when applying a magnetic field from the opposing member 4 to the paste 5, it is only necessary to make a part of the opposing member 4 the magnet piece 20, so the amount of magnet can be reduced.

[0034] (1-4) The magnetic field application unit 16 (in this example, the second magnetic field application unit 18) is provided on the conveying roll 3, thereby applying a magnetic field from the conveying roll 3 to the paste 5. According to this configuration, since the magnetic field is applied from the conveying roll 3 to the paste 5 while the current collector 2 is conveyed downstream by the conveying roll 3, the magnetic field can be efficiently applied to the paste 5.

[0035] (1-5) The conveying roll 3 is formed of a magnet, thereby constituting the magnetic field application unit 16 (in this example, the second magnetic field application unit 18). According to this configuration, since the entire conveying roll 3 is a magnet, a strong magnetic field can be applied to the paste 5.

[0036] (1-6) The magnetic field application unit 16 is provided on both the conveying roll 3 and the opposing member 4. According to this configuration, a strong magnetic field can be applied to the paste 5 by the magnetic field application units 16 provided on both the conveying roll 3 and the opposing member 4. Therefore, it further contributes to improving the degree of orientation of the active material 19 in the paste.

[0037] (1-7) The coating unit 10 is a comma coater 11 that coats the current collector 2 with the paste 5 while scraping off the unnecessary paste 5 by the comma roll 12 as the opposing member 4. According to this configuration, since the comma coater 11 is used as the coating unit 10, the equipment of the coating unit 10 does not become large-sized.

[0038] (Second Embodiment) Next, the second embodiment will be described. The second embodiment is an example in which the coating unit 10 of the first embodiment is changed. Therefore, the same reference numerals are given to the same parts as those in the first embodiment and the description thereof is omitted, and only the different parts will be described in detail.

[0039] (Coating Unit 10) As shown in Fig. 12, the coating section 10 is a die coater 32 that coats the current collector 2 with the paste 5 by discharging the paste 5 from the die head 31 as the opposing member 4 onto the current collector 2. The die coater 32 applies the paste 5 to the current collector 2 conveyed by the conveying roll 3 from the die lip 33 at the tip of the die head 31 while applying shear. Since the die coater 32 applies the paste 5 while extruding it from the die head 31, it has excellent coating stability and enables high-precision coating.

[0040] (Magnetic field application section 16) As shown in Fig. 12, the magnetic field application section 16 (the first magnetic field application section 17 and the second magnetic field application section 18) is provided on the conveying roll 3 and the die head 31. In the case of this example, the first magnetic field application section 17 is provided at the tip of the die head 31. Also, the second magnetic field application section 18 is composed of the conveying roll 3 as in the first embodiment. In this way, at the timing when the die head 31 applies the paste 5 to the current collector 2, a magnetic field is applied to the paste 5 to which shear has been applied.

[0041] (Improvement in the degree of orientation of the active material 19 by the die coater 32) Fig. 13 shows the shear force applied to the paste 5 by the die coater 32. In the figure, the strength of the shear force generated by the paste 5 is represented by the density of the dots. The darker the dots, the higher the shear force, and the lighter the dots, the lower the shear force. The die coater 32 extrudes the paste 5 from the die head 31 onto the surface of the current collector 2 at a predetermined pressure. Therefore, even when the paste 5 is applied to the current collector 2 by the die coater 32, it is possible to apply a high shear force to the paste 5.

[0042] Particularly, in the case of the die coater 32, since the paste 5 is discharged from the die head 31 to the current collector 2 at a predetermined pressure, it becomes possible to apply the paste 5 to the current collector 2 while applying the predetermined pressure to the paste 5. For this reason, when applying the paste 5 with the die head 31, it becomes possible to apply a high shearing force to the paste 5 as compared with the case of using the comma coater 11. As a result, the paste viscosity becomes even lower, and accordingly, the orientation degree of the active material 19 when a magnetic field is applied in the magnetic field application portion 16 is further improved. Therefore, it further contributes to the improvement of the input / output characteristics of the lithium ion battery.

[0043] (Effect of Embodiment) According to the configuration of the above embodiment, the following effects can be obtained. (2-1) The coating section 10 is a die coater 32 that applies the paste 5 to the current collector 2 by discharging the paste 5 from the die head 31 as the opposing member 4. According to this configuration, since the die coater 32 is used as the coating section 10, it becomes possible to apply a strong shearing force to the paste 5 by the die coater 32. As a result, the paste viscosity becomes even lower, and thus the active material 19 easily moves in the paste. Therefore, it further contributes to the improvement of the orientation degree of the active material 19 in the paste.

[0044] (Other Embodiments) Note that this embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0045] · In each embodiment, the magnetic pole directions (the directions of the N pole and S pole) of the first magnetic field application portion 17 and the second magnetic field application portion 18 may be opposite to the magnetic pole directions of the examples. · In each embodiment, the magnetic field application portion 16 is not limited to being provided on both the conveying roll 3 and the opposing member 4, and may be provided on only one of them.

[0046] · In each embodiment, the conveying roll 3 may be formed by magnets only on its surface. That is, the second magnetic field applying unit 18 may be a magnet attached to the outer peripheral surface of the conveying roll 3.

[0047] · In each embodiment, the opposing member 4 may be entirely composed of magnets. · In each embodiment, the application of the magnetic field may be carried out only during either the coating process or before the coating process.

[0048] · In each embodiment, the magnetic field applying unit 16 may be constituted by a member separate from the conveying roll 3 and the opposing member 4. · In each embodiment, the magnetic field applying unit 16 may be made of any material.

[0049] · In each embodiment, the coating unit 10 is not limited to the comma coater 11 or the die coater 32. The coating unit 10 may be, for example, a lip coater, a gravure coater, a reverse coater, an air knife coater, etc.

[0050] · In each embodiment, the electrode sheet 6 to be manufactured is not limited to the negative electrode sheet, and may also be a positive electrode sheet. · In each embodiment, the electrode material to be kneaded is not limited to the paste for the positive electrode of the lithium ion secondary battery, and may also be the paste for the negative electrode of the lithium ion secondary battery.

[0051] · In each embodiment, the secondary battery is not limited to the lithium ion secondary battery or the nickel hydrogen secondary battery, and if it is necessary to prepare a paste, a secondary battery other than the lithium ion secondary battery and the nickel hydrogen secondary battery may also be used.

[0052] · In each embodiment, the battery is not limited to a sealed battery having a rectangular parallelepiped shape, and may have a shape other than the rectangular parallelepiped shape such as a cylindrical shape. ·In each embodiment, the secondary battery is not limited to being mounted on an electric vehicle or a hybrid vehicle, and may also be mounted on vehicles such as gasoline vehicles and diesel vehicles. Further, the secondary battery may be used as a power source for moving bodies such as railways, ships, aircraft, and robots, or for electrical products such as information processing devices.

[0053] ·In each embodiment, although the present disclosure has been described in accordance with the examples, it is understood that the present disclosure is not limited to such examples and structures. The present disclosure also includes various modifications and modifications within the equivalent scope. In addition, various combinations and forms, and further other combinations and forms including only one element, more than one element, or less than one element thereof, are within the scope and spirit of the present disclosure.

Description of Reference Numerals

[0054] 1... Electrode manufacturing apparatus, 2... Current collector, 3... Conveyor roll, 4... Opposing member, 5... Paste, 6... Electrode sheet, 10... Coating section, 11... Comma coater, 12... Comma roll, 16... Magnetic field application section, 17... First magnetic field application section, 18... Second magnetic field application section, 19... Active material, 20... Magnet piece, 31... Die head, 32... Die coater, Ea... Generation site.

Claims

1. An electrode manufacturing apparatus for manufacturing an electrode sheet of a battery by applying a paste of an electrode composite material to a current collector, comprising: a coating section that applies the paste to the current collector while applying shear to the paste between a transport roll that transports the current collector and an opposing member disposed opposite to the transport roll; the coating section having a magnetic field application section that applies a magnetic field for orienting an active material contained in the paste to a site where shear of the paste occurs at least in one of during and before application of the paste, the electrode manufacturing apparatus.

2. The electrode manufacturing apparatus according to claim 1, wherein the magnetic field application section is provided on the opposing member to apply a magnetic field from the opposing member to the paste.

3. The electrode manufacturing apparatus according to claim 2, wherein the magnetic field application section provided on the opposing member is a magnet piece disposed at a tip position closest to the transport roll in the opposing member.

4. The electrode manufacturing apparatus according to claim 1, wherein the magnetic field application section is provided on the transport roll to apply a magnetic field from the transport roll to the paste.

5. The electrode manufacturing apparatus according to claim 4, wherein the transport roll is formed of a magnet to constitute the magnetic field application section.

6. The electrode manufacturing apparatus according to claim 1, wherein the magnetic field application section is provided on both the transport roll and the opposing member.

7. The electrode manufacturing apparatus according to claim 1, wherein the coating section is a comma coater that applies the paste to the current collector while scraping off unnecessary paste with a comma roll as the opposing member.

8. The electrode manufacturing apparatus according to claim 1, wherein the coating section is a die coater that applies the paste to the current collector by discharging the paste from a die head as the opposing member.

9. An electrode manufacturing method for manufacturing an electrode sheet of a battery by using a coating section having a transport roll that transports a current collector and an opposing member disposed opposite to the transport roll, and applying the paste to the current collector while applying shear to a paste of an electrode composite material between the transport roll and the opposing member, comprising: An electrode manufacturing method, wherein a magnetic field applying section is provided in the coating section, and a magnetic field for orienting the active material contained in the paste is applied from the magnetic field applying section to the site where shearing of the paste occurs during at least one of the paste coating time and before the coating.

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