JP2014175254A - Electrode manufacturing device and method of manufacturing electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode manufacturing device and a method of manufacturing electrode, capable of suppressing the height of a raised portion.SOLUTION: An electrode manufacturing device 10 includes a coating section 21 for coating a metal foil M with slurry S containing an active material, and an electric field applying section 40 for generating an upward attraction force in a flat part, other than a raised portion existing along the end of a coating film F of the slurry S applied to the metal foil M, by applying an electric field to the flat part. Consequently, the slurry S at the raised portion moves to the flat part, and the height of the raised portion is suppressed.

Description

  The present invention relates to an electrode manufacturing apparatus and an electrode manufacturing method.

  A secondary battery as an example of a power storage device includes an electrode assembly in which electrodes having an active material layer are stacked with a separator interposed therebetween. As an electrode manufacturing apparatus for manufacturing an electrode having such an active material layer, for example, an apparatus including an application unit that applies a slurry containing an active material to a metal foil is known (see, for example, Patent Document 1). .

JP 2010-205429 A

  Here, when the slurry is applied to the metal foil, a raised portion is generated at the end of the coating film of the slurry. When an electrode is manufactured by drying the coating film in a state where such a raised portion is generated, the flatness of the active material layer is lowered due to the raised portion. When an electrode assembly is manufactured by stacking such an electrode with reduced flatness of the active material layer with a separator sandwiched therebetween, the length of the electrode assembly in the stacking direction may vary, In addition, the position of the separator may shift, and the yield may decrease.

  On the other hand, for example, Patent Document 1 describes a configuration in which slurry is applied so that the film thickness gradually decreases from the center toward the end. Control is required, and there is a concern about the complexity of the configuration. In addition, when the film thickness varies, the ratio of the positive electrode capacity / negative electrode capacity varies in a part of the electrode, so that a cation deposit may be generated due to electrochemical reaction. From the above, there is still room for improvement in the configuration for suppressing the height of the raised portion.

  This invention is made | formed in view of the situation mentioned above, and aims at providing the manufacturing method of the electrode which can suppress the height of a protruding part, and the manufacturing method of an electrode.

  An electrode manufacturing apparatus that achieves the above object includes: an application unit that applies a slurry containing an active material to a metal foil; and an electric field applied to at least a part of the coating film of the slurry applied to the metal foil. And an electric field application unit for applying a voltage.

  According to such a configuration, an attractive force or a repulsive force can be applied to the coating film by applying an electric field to at least a part of the coating film of the slurry applied to the metal foil. Thereby, the height of the protruding part which can arise in the edge part of a coating film using attractive force or repulsive force can be suppressed.

  About the said electrode manufacturing apparatus, it is good to provide the drying part which dries the said coating film to which the said electric field was applied in the said electric field application part. According to such a configuration, the coating film is dried in a state where the height of the raised portion is suppressed by application of an electric field. Thereby, even if it is a case where application of an electric field stops, the state where the height of the protruding part was suppressed is maintained. Therefore, an active material layer in which the height of the raised portion is suppressed can be obtained.

  About the said electrode manufacturing apparatus, the said electric field application part applies the said electric field with respect to at least one part of flat parts other than the protruding part which exists along the edge part of the said coating film among the said coating films, It is preferable to generate an attractive force in a direction including a direction component away from the metal foil in a portion to which an electric field is applied. According to such a configuration, by applying an electric field to at least a part of the flat portion other than the raised portion of the coating film, an attractive force in a direction including a directional component away from the metal foil is applied to the portion to which the electric field is applied. Occurs. In this case, at least a part of the slurry in the raised portion moves toward the portion where the attractive force is generated. Therefore, the height of the raised portion can be suppressed.

  About the said electrode manufacturing apparatus, the said coating film has the protruding part which exists along the edge part of the said coating film, and a flat part other than the said protruding part, The said electric field application part is with respect to the said protruding part. By applying the electric field, a repulsive force in a direction including a directional component from the raised portion toward the flat portion may be generated in the raised portion. According to this configuration, by applying an electric field to the raised portion, a repulsive force in a direction including a direction component from the raised portion toward the flat portion is generated in the raised portion. In this case, at least a part of the slurry in the raised portion moves toward the flat portion. Thereby, the height of a protruding part can be suppressed.

  An electrode manufacturing method that achieves the above-described object includes a coating step of applying a slurry containing an active material to a metal foil, and at least a part of the coating film of the slurry applied to the metal foil. And an electric field application step of applying an electric field. According to this configuration, an attractive force or a repulsive force can be applied to the coating film by applying an electric field to at least a part of the coating film of the slurry. Thereby, the height of the protruding part which can arise in the edge part of a coating film using attractive force or repulsive force can be suppressed.

  About the manufacturing method of the said electrode, it is further provided with the drying process which dries the said coating film, and the said electric field application process is good at the start timing of the said drying process. According to such a configuration, an electric field is applied to at least a part of the coating film at the start timing of the drying process. Thereby, a coating film can be dried in the state by which the height of the protruding part was suppressed by electric field application.

  According to this invention, the height of the raised portion can be suppressed.

The front view which shows an electrode manufacturing apparatus typically. The top view of an electric field application part and metal foil. (A) is the sectional view on the 3a-3a line of FIG. 2, (b) is a partially enlarged view of (a). The top view of the electric field application part and metal foil of 2nd Embodiment. FIG. 5 is a sectional view taken along line 5-5 of FIG. The figure which shows the electric field application part of another example. The perspective view of the electrode for electric field application of another example. The top view of the electric field application part and metal foil of another example. (A) is the 9a-9a sectional view taken on the line of FIG. 8, (b) is the 9b-9b sectional view of FIG.

(First embodiment)
Hereinafter, a first embodiment of an electrode manufacturing apparatus will be described. In addition, the electrodes manufactured by the electrode manufacturing apparatus are stacked with a separator interposed therebetween to form an electrode assembly. The electrode assembly is used for a secondary battery as a power storage device. Moreover, the electrode manufacturing apparatus of this embodiment shall manufacture a positive electrode among a positive electrode and a negative electrode.

  As shown in FIG. 1, the electrode manufacturing apparatus 10 includes a supply roller 11 to which a wound strip-shaped metal foil M can be attached, and a take-up roller 12 capable of winding the metal foil M. Each of the rollers 11 and 12 is configured to be rotatable. The electrode manufacturing apparatus 10 rotates the rollers 11 and 12 in a state in which the wound metal foil M is attached to the supply roller 11 and one end in the longitudinal direction of the metal foil M is attached to the winding roller 12. As a result, the metal foil M is conveyed.

  The electrode manufacturing apparatus 10 includes an application unit 21 that applies a slurry S containing an active material, a conductive additive, a binder, a solvent, and the like to the metal foil M to be conveyed. The application unit 21 includes a coating roll 22, a slurry S stored therein, a supply unit 23 that supplies the slurry S to the coating roll 22, and a comma roll 24. The application unit 21 includes a backing roll 25 provided near the coating roll 22 and to which the metal foil M is conveyed. The application unit 21 transfers the slurry S applied to the coating roll 22 to the metal foil M through the vicinity of both by rotating the coating roll 22 and the backing roll 25 in the same direction. In this embodiment, the application unit 21 applies the slurry S continuously. In addition, the process of apply | coating the slurry S to the metal foil M using the application part 21 respond | corresponds to an application | coating process.

The material of the metal foil M differs between the positive electrode and the negative electrode. The metal foil M is, for example, aluminum when manufacturing the positive electrode, and is copper, for example, when manufacturing the negative electrode.
As shown in FIG. 1, the electrode manufacturing apparatus 10 includes a drying furnace 31 as a drying unit that dries the coating film F of the slurry S applied by the application unit 21. The drying furnace 31 is disposed between the coating unit 21 and the winding roller 12. In addition, the process of drying the coating film F of the slurry S by the drying furnace 31 corresponds to a drying process.

  In the drying furnace 31, a plurality of conveyance rollers 32 that assist the conveyance of the metal foil M are arranged in parallel along the conveyance direction T of the metal foil M. Each transport roller 32 is made of a conductive material and is rotatable. The metal foil M is installed on each conveyance roller 32 and conveyed on each conveyance roller 32.

  In the drying furnace 31, a plurality of pressing rollers 33 that press the metal foil M in cooperation with the transport roller 32 are provided. The pressing roller 33 is disposed above the conveying roller 32. A part of the metal foil M is sandwiched between the pressing roller 33 and the conveying roller 32.

  The electrode manufacturing apparatus 10 includes a pressing device that presses the dried coating film F, a cutting device that cuts the metal foil M into a predetermined electrode shape, and the like. The electrode manufacturing apparatus 10 manufactures an electrode having an active material layer by pressing the dried coating film F and cutting the metal foil M.

  As shown in FIG. 1, the electrode manufacturing apparatus 10 includes an electric field applying unit 40 that applies an electric field to at least a part of the coating film F of the slurry S applied by the applying unit 21. The electric field application unit 40 will be described together with the shape of the coating film F and the like.

  As shown in FIG. 2, the coating film F on the metal foil M extends in a direction along the transport direction T of the metal foil M. Moreover, when the direction orthogonal to both the conveyance direction T of the metal foil M and the thickness direction of the metal foil M is a width direction W of the metal foil M, the length of the coating film F in the width direction W is metal. The exposed portion M1 is shorter than the length of the foil M in the width direction W, and the slurry S is not applied to both sides of the coating film F of the metal foil M in the width direction W of the metal foil M and the metal foil M is exposed. There is.

  In addition, each pressing roller 33 is spaced apart in the width direction W of the metal foil M through the coating film F. The pressing roller 33 sandwiches the exposed portion M <b> 1 of the metal foil M in cooperation with the conveying roller 32.

  As shown in FIG.2 and FIG.3 (b), the coating film F has the flat flat part F1 and the protruding part F2 which protruded rather than the said flat part F1. The raised portion F2 is along both end portions Fa and Fb in the width direction W of the metal foil M in the coating film F. The flat portion F1 is a portion other than the raised portion F2 in the coating film F.

  As shown in FIGS. 2 and 3, the electric field applying unit 40 includes an electric field applying electrode 41 used to apply an electric field. The electric field application electrode 41 has a plate shape extending in a direction along the transport direction T. As shown in FIG. 3A, the length L1 of the electric field application electrode 41 in the width direction W is the same as or shorter than the length L2 of the flat portion F1 in the width direction W. The electric field application electrode 41 is disposed opposite and spaced above the flat portion F1. In this case, the electric field applying electrode 41 does not exist above the raised portion F2.

  As shown in FIGS. 2 and 3, the electric field applying unit 40 includes an electric field applying electrode 41 and a DC power source 42 that applies a voltage between the transport rollers 32. The electric field applying unit 40 applies an electric field to the flat portion F <b> 1 of the coating film F by applying a voltage between the electric field applying electrode 41 and each transport roller 32 using the DC power source 42. Electric field application by the electric field application unit 40 corresponds to an electric field application process. The electric field application electrode 41 is located at the most upstream position in the transport direction T in the drying furnace 31, and the electric field application by the electric field application electrode 41 is performed at least at the start timing of the drying process.

Next, the operation of this embodiment will be described.
As shown in FIG. 3A, when a voltage is applied between the electric field applying electrode 41 and each transport roller 32, the slurry S in the flat portion F1 is charged to +, and the electric field applying electrode 41 is set to-. Charges up. As a result, an upward attractive force is generated in the flat portion F1. For this reason, the flat part F1 is pulled upward, and the slurry S of the raised part F2 moves to the flat part F1 accordingly.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) The electrode manufacturing apparatus 10 applies an electric field to at least a part of the application part 21 that applies the slurry S containing the active material to the metal foil M and the slurry S applied to the metal foil M. And an electric field applying unit 40. Thereby, the Coulomb force can be applied to the slurry S applied to the metal foil M. Therefore, the height of the raised portion F2 generated along the end portions Fa and Fb of the coating film F of the slurry S can be suppressed. Therefore, it is possible to suppress a decrease in flatness of the active material layer due to the raised portion F2.

  (2) Specifically, the electric field application unit 40 applies an electric field to the flat portion F1 other than the raised portion F2 in the coating film F of the slurry S applied to the metal foil M, thereby causing the flat portion F1. In addition, an attractive force in a direction including a direction component away from the metal foil M, that is, an upper component is generated. Thereby, since the slurry S of the raised portion F2 moves to the flat portion F1 by the attractive force generated in the flat portion F1, the height of the raised portion F2 can be suppressed.

  (3) The electric field application unit 40 is provided in the drying furnace 31, and the drying furnace 31 dries the coating film F to which the electric field is applied by the electric field application unit 40. Specifically, the electric field application step is performed at least at the start timing of the drying step. Thereby, the coating film F hardens | cures in the state in which the height of the protruding part F2 was suppressed by electric field application. Therefore, even when the application of the electric field is stopped, the state where the height of the raised portion is suppressed is maintained. Therefore, an active material layer in which the height of the raised portion is suppressed can be obtained.

  (4) The electric field application unit 40 applies an electric field to the coating film F by applying a voltage between the transport rollers 32 and the electric field application electrode 41. Thereby, an electric field can be suitably applied using each conveyance roller 32 which is the composition for conveying metal foil M.

  (5) There is a pressing roller 33 that holds the exposed portion M <b> 1 of the metal foil M in cooperation with each conveyance roller 32. Thereby, it is possible to suppress inconvenience due to the application of an electric field, for example, the metal foil M is lifted or the metal foil M is wrinkled.

  (6) The electrode manufacturing apparatus 10 manufactures a positive electrode. In this case, the metal foil M used for manufacturing the positive electrode is aluminum. Since there is a stable oxide film with a small surface energy on the surface of the aluminum, the wettability of the slurry S is poor and the raised portion F2 tends to be high. In this regard, according to the present embodiment, by applying an electric field, it is possible to suppress the height of the raised portion F2, which is particularly problematic when aluminum is used.

(Second Embodiment)
In the present embodiment, the shape and the like of the electric field application electrode are different from those in the first embodiment. The different points will be described in detail below. In addition, about the structure same as 1st Embodiment, while attaching | subjecting the same code | symbol, the detailed description is abbreviate | omitted.

  As shown in FIGS. 4 and 5, the electric field applying unit 50 of the present embodiment includes a pair of electric field applying electrodes 51 and 52 that are separated in the width direction W of the metal foil M. As shown in FIG. 4, the electric field applying electrodes 51 and 52 are plate-shaped extending in the direction along the transport direction T. Further, as shown in FIG. 5, the electric field applying electrodes 51 and 52 are respectively disposed above the raised portions F2. The thickness of the metal foil M is such that the height with respect to the metal foil M gradually decreases in the width direction W of the metal foil M from the central portion of the metal foil M toward both ends Ma and Mb. Inclined with respect to the vertical direction.

  Further, the positive terminal of the direct current power source 42 of the present embodiment is connected to the electric field applying electrodes 51 and 52 and the transport rollers 32, and the negative terminal of the direct current power source 42 is grounded. The electric field applying unit 50 applies a voltage to the electric field applying electrodes 51 and 52 and the respective transport rollers 32 by using the DC power source 42, so that the raised portion F <b> 2 disposed below the electric field applying electrodes 51 and 52. An electric field is applied to.

Next, the operation of this embodiment will be described.
By applying the voltage, the electric field applying electrodes 51 and 52 and the slurry S of the raised portion F2 are charged to +. Thereby, the repulsive force of the direction containing the direction component which goes to the flat part F1 from the raised part F2 arises in the raised part F2. For this reason, at least a part of the slurry S included in the raised portion F2 moves toward the flat portion F1.

According to this embodiment explained in full detail above, in addition to the effect of (1) and (3)-(6), there exist the following outstanding effects.
(7) The electric field application unit 50 applies an electric field to the raised portion F2 of the coating film F applied to the metal foil M, thereby causing the raised portion F2 to have a directional component from the raised portion F2 toward the flat portion F1. A repulsive force is generated in a direction including Thereby, the height of the raised portion F2 can be suppressed.

  (8) The electric field application electrodes 51 and 52 are arranged so that the height relative to the metal foil M gradually decreases from the central portion of the metal foil M toward both ends Ma and Mb in the width direction W of the metal foil M. It is inclined with respect to the thickness direction of M. Thereby, the slurry S of the raised portion F2 is regulated so as to move toward the center side of the coating film F, that is, toward the flat portion F1. Therefore, it can suppress that the slurry S of the protruding part F2 moves to the both ends Ma and Mb side of the metal foil M in the width direction W.

In addition, you may change each said embodiment as follows.
In the first embodiment, since the electric field application electrode 41 and the slurry S are conductors and are close to each other, they can be regarded as capacitors. In this case, since the capacitance of the capacitor depends on the distance between the electric field application electrode 41 and the coating film F of the slurry S, the distance between the electric field application electrode 41 and the coating film F is calculated based on the capacitance. Can do.

  Focusing on this point, as shown in FIG. 6, an AC power supply 61 connected in series to the DC power supply 42 may be provided, and the AC voltage may be superimposed on the DC voltage. And the clamp meter 62 as a measurement part which measures the electric current value of the alternating current component which flows through the circuit including the capacitor | condenser which consists of the capacitor | condenser which consists of the capacitor | condenser which consists of the capacitor | condenser which consists of the electric field application electrode 41, and the coating film F, and the control part 63 into which the measurement result of the clamp meter 62 is input. It is good to have. The control unit 63 calculates the impedance of the circuit from the measurement result of the clamp meter 62. Further, the control unit 63 previously grasps the impedance of each element other than the capacitor composed of the electric field application electrode 41 and the coating film F, and based on the grasp result and the impedance of the circuit, the electric field application electrode 41 and The capacitance of the capacitor composed of the coating film F is calculated. The control unit 63 calculates the distance between the electric field application electrode 41 and the coating film F from the calculated capacitance, and controls the voltage control of the DC power supply 42 and the position control of the electric field application electrode 41 based on the calculation result. It is good to set it as the structure which performs at least one. Thereby, the attractive force generated in the flat portion F1 can be suitably controlled. For example, the inconvenience that the flat portion F1 rises due to the excessively strong attractive force generated in the flat portion F1 can be avoided. .

  In the first embodiment, the electric field applying unit 40 is configured to apply an electric field only to the flat portion F1 and not to apply an electric field to the raised portion F2, but is not limited thereto, and the flat portion F1 and the raised portion F2 are not limited thereto. The structure which applies an electric field to both of these may be sufficient. In this case, the strength of the electric field applied to the flat portion F1 may be made stronger than the strength of the electric field applied to the raised portion F2.

  As shown in FIGS. 7 to 9, an electric field applying electrode 71 having a shape corresponding to the shape change of the raised portion F2 may be used. As shown in FIG. 7, the electric field applying electrode 71 has a rectangular plate-shaped main body 72 and a convex portion 73 protruding from the surface 72 a of the main body 72. The convex portion 73 has a trapezoidal cross-sectional shape when cut in a direction orthogonal to the longitudinal direction of the electric field applying electrode 71. The height of the trapezoid, which is the cross-sectional shape of the convex portion 73, gradually increases as the length from the one end surface 71a in the longitudinal direction of the electrode 71 for electric field application increases to the other end surface 71b, and the upper and lower sides of the trapezoid gradually decrease. In this case, one end surface 71a in the longitudinal direction of the electric field applying electrode 71 has a rectangular shape, and the other end surface 71b has a convex shape in which the thickness on the center side is thicker than the thickness on both ends in the short side direction. Yes.

  In such a configuration, as shown in FIGS. 8, 9A, and 9B, the electric field applying electrode 71 has a convex other end surface 71b disposed on the upstream side in the transport direction T, A rectangular end surface 71 a is arranged on the downstream side in the transport direction T. 9A, the surface 73a of the convex portion 73 is disposed above the flat portion F1, and the surface 72a of the main body 72 at a position recessed from the surface 73a of the convex portion 73 is a raised portion. Arranged above F2. By applying an electric field to the coating film F using the electric field applying electrode 71 arranged in this manner, the raised portion F2 is applied with a strong magnetic field to the flat portion F1 when the height of the raised portion F2 is high. A weak magnetic field can be applied to the flat portion F1 in correspondence with the gradually decreasing height of F2. In order to make the electric field applied to the flat part F1 stronger than the raised part F2, at least the distance between the surface 73a of the convex part 73 and the flat part F1 on the other end surface 71b is the same as the surface 72a of the main body 72 and the raised part F2. It should be shorter than the distance between them.

  In the first embodiment, the number of electric field application electrodes 41 is one. However, the present invention is not limited to this. For example, a plurality of electric field application electrodes are provided, and a voltage is applied between the plurality of electric field application electrodes. The surface of the coating film F may have a surface polarization.

  In each embodiment, the metal foil M is transported by the transport rollers 32. However, the present invention is not limited to this. For example, the metal foil M may be transported by a belt conveyor. In this case, a voltage is applied to the belt conveyor and the electric field application electrodes 41, 51, 52.

  In the first embodiment, the voltage is applied between the transport rollers 32 and the electric field application electrode 41. However, the configuration is not limited thereto, and the voltage is applied between the metal foil M and the electric field application electrode 41. It may be.

In the first embodiment, the electric field is applied to the entire flat part F1, but the present invention is not limited to this, and any structure may be used as long as the electric field is applied to at least a part of the flat part F1.
In the second embodiment, the two electric field application electrodes 51 and 52 are provided. However, the present invention is not limited to this, and either one may be omitted.

The electric field application by the electric field application unit 40 may be performed at least at the start timing of the drying process, and it is not necessary to apply an electric field if the fluidity of the slurry S is lowered to some extent.
In each embodiment, although the electrode manufacturing apparatus 10 manufactures a positive electrode, it is not restricted to this, You may manufacture a negative electrode.

O The specific structure of the application part 21 is arbitrary. For example, a configuration using a slot die may be used.
A structure having a first electric field applying electrode that generates an attractive force by applying an electric field to the flat portion F1, and a second electric field applying electrode that generates an repulsive force by applying an electric field to the raised portion F2. There may be.

  In the first embodiment, the direction of the attractive force generated in the flat portion F1 only needs to include an upper component, and may be inclined with respect to the vertical direction, for example. In the second embodiment, the direction of the repulsive force generated in the raised portion F2 only needs to include a direction component from the raised portion F2 toward the flat portion F1, and is inclined with respect to the width direction W of the metal foil M, for example. Alternatively, it may be along the width direction W.

○ The pressing roller 33 may be omitted.
In each embodiment, the application unit 21 is configured to continuously apply the slurry S, but is not limited thereto, and may be configured to apply the slurry S intermittently. In this case, the electric field application electrode may have a shape extending in the direction along the transport direction T as in the first embodiment. Moreover, the shape of the electrode for applying an electric field is more than that of the coating film so that an electric field is applied to a flat portion other than the frame-like raised portion generated along the edge of the coating film of the slurry S applied intermittently. It may be a rectangular plate that is slightly smaller, or the electrode may be framed so as to apply an electric field to the frame-like raised portion.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The electric field applying unit includes an electric field applying electrode disposed opposite to the coating film, and applies a DC voltage in which an AC voltage is superimposed between the electric field applying electrode and the coating film. Based on the measurement result of the measurement unit that measures the AC component of the current that flows by applying a DC voltage with AC voltage superimposed on it, the distance between the electrode for applying an electric field and the coating film is calculated In addition, a control unit that controls at least one of the distance between the electric field application electrode and the coating film and the DC voltage based on the calculation result may be provided.

  DESCRIPTION OF SYMBOLS 10 ... Electrode manufacturing apparatus, 21 ... Application | coating part, 31 ... Drying furnace, 40 ... Electric field application part, 41 ... Electrode for electric field application, 50 ... Electric field application part of 2nd Embodiment, 51, 52 ... Electric field of 2nd Embodiment Application electrode, 62 ... clamp meter, 63 ... control unit, 71 ... electric field application electrode, M ... metal foil, S ... slurry, F ... coating film of slurry, F1 ... flat part, F2 ... raised part.

Claims (6)

An application part for applying a slurry containing an active material to a metal foil;
An electric field applying unit that applies an electric field to at least a part of the coating film of the slurry applied to the metal foil;
An electrode manufacturing apparatus comprising:   The electrode manufacturing apparatus of Claim 1 provided with the drying part which dries the said coating film to which the said electric field was applied in the said electric field application part.   The electric field application unit is a portion to which the electric field is applied by applying the electric field to at least a part of a flat portion other than the raised portion existing along the edge of the coating film. The electrode manufacturing apparatus according to claim 1, wherein an attractive force is generated in a direction including a direction component away from the metal foil. The coating film has a raised portion that exists along the edge of the coating film, and a flat portion other than the raised portion,
The said electric field application part produces the repulsive force of the direction containing the direction component which goes to the said flat part from the said protruding part in the said protruding part by applying the said electric field with respect to the said protruding part. The electrode manufacturing apparatus as described in any one. An application process for applying a slurry containing an active material to a metal foil;
An electric field applying step of applying an electric field to at least a part of the coating film of the slurry applied to the metal foil;
An electrode manufacturing method comprising: Further comprising a drying step of drying the coating film,
The method for manufacturing an electrode according to claim 5, wherein the electric field applying step is performed at least at the start timing of the drying step.