JP4501247B2 - Battery electrode manufacturing method and battery electrode manufacturing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery electrode manufacturing method and a manufacturing apparatus to which electrophoresis is applied.
[0002]
[Prior art]
In recent years, high-performance secondary batteries have been actively developed as clean energy sources used in notebook computers, small portable devices, automobiles, and the like. The secondary battery used here is required to have a large capacity and a high output while being small and light, that is, a high energy density and a high output density. As secondary batteries that can achieve high energy density and high output density, non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries are considered promising.
[0003]
A lithium ion secondary battery includes a positive electrode having a positive electrode active material layer capable of inserting and extracting lithium ions, a negative electrode having a negative electrode active material layer capable of inserting and extracting lithium ions released from the positive electrode, and a space between the positive electrode and the negative electrode. And an electrolyte solution that moves lithium ions between the positive electrode and the negative electrode. As a conventional method for producing these electrodes, a suspension in which an active material is suspended is applied and dried on a current collector surface made of a thin film such as a metal foil by a coating method such as a die coater, a comma coater, or a blade coater. After that, the density was increased by pressing or the like.
[0004]
However, in recent years, the electrode has been made thinner in order to obtain a battery having high output and excellent large current characteristics, and it has become difficult to produce a uniform and accurate active material layer by the conventional production method. In order to solve this problem, a method of forming a positive electrode active material layer on the entire surface of the current collector using electrophoresis is disclosed (Abstract No. P24 of the 66th Annual Meeting of the Electrochemical Society).
[0005]
By the way, as shown in FIG. 6, the electrode has a structure in which an active material layer non-formed part B is provided in the current collector 10 in order to reduce the resistance of the current collecting part, and a plurality of current collecting leads 11 are formed from that part. It has been adopted. Therefore, it is necessary to produce a portion where the active material layer is not formed on the surface of the current collector plate.
[0006]
However, in the prior art, for the purpose of preventing the active material layer from being formed on the entire surface of the current collector, the portion of the current collector on which the active material layer is not desired is masked in advance with a masking tape or the like. After forming the active material layer by electrophoresis, the tape was peeled off, or a part without the active material layer was produced by removing a part of the formed active material layer.
[0007]
[Problems to be solved by the invention]
As described above, in the prior art, a great amount of labor is required to produce a portion where the active material layer is not formed.
[0008]
Therefore, the present invention provides a battery electrode manufacturing method that can easily form a portion where the active material layer is not formed in the battery electrode manufacturing method of forming an active material layer by electrophoresis. This is a problem to be solved.
[0009]
The present invention also provides an apparatus for manufacturing a battery electrode that can easily form a portion where no active material layer is formed in an apparatus for manufacturing an electrode for a battery that forms an active material layer by electrophoresis. Doing it is also an issue to be solved.
[0010]
[Means for Solving the Problems]
The manufacturing method of the battery electrode of the present invention that solves the above problems includes an immersion step of immersing a current collector in a solution in which an active material is dispersed in a solvent, and generating a potential gradient in the solution. An electrophoretic process in which an active material is electrophoresed in the solution and the active material is attached to the surface of the current collector as an active material layer. In the method for producing a battery electrode, inhibiting the electrophoresis of the active material to a predetermined portion of the body surface, using a shielding member disposed independently of the current collector, wherein the shielding member, Ru is adjusted to the current collector and the same potential It is characterized by that.
[0011]
That is, electrophoresis is inhibited by an independent shielding member so that the active material does not adhere to the surface of the current collector. Therefore, it is possible to form a portion where the active material layer is not formed in a necessary portion of the current collector without performing any treatment on the current collector in advance and without performing any post-treatment.
Further, the shielding member is adjusted to the same potential as the current collector in order to more precisely control the portion where the active material layer is not formed.
[0012]
In the electrophoresis step, it is preferable that the potential gradient is generated by at least two types of electrodes including a positive electrode and a negative electrode, and one of the positive electrode and the negative electrode serves as the current collector. By directly applying a voltage to the current collector, electrophoresis can be controlled more precisely and the total number of electrodes can be reduced. Moreover, in order to form an active material layer on both sides of the current collector, it is more preferable that the other electrode is provided on each side of the current collector.
[0014]
Furthermore, the electrophoresis step is preferably adjusted so that the thickness of the active material layer on the surface of the current collector is 50 μm or less, further 25 μm or less. This is because the thinner the active material layer, the lower the internal resistance of the battery.
[0015]
In order to control the surface potential of the active material, the solution preferably contains a charging agent that charges the surface of the active material.
[0016]
And the manufacturing apparatus of the battery electrode which solves the said subject is a manufacturing apparatus of the battery electrode which consists of a collector and the active material layer formed in the surface of this collector, Comprising: Current collector delivery means for delivering, a solution tank in which an active material constituting the electrode active material layer is dispersed in a solvent, a solution tank for allowing the current collector to pass through the solution, and a solution tank A voltage applying means for generating a potential gradient and causing the active material to be electrophoresed and deposited on the current collector; and a member disposed independently of the current collector, wherein the member is disposed in the solution tank. possess a shielding member for shielding a predetermined portion of the current collector, the current collector capturing means for capturing the current collector the active material is adhered, the shield member is adjusted to the current collector and the same potential It is characterized by Rukoto.
[0017]
That is, electrophoresis is inhibited by an independent shielding member so that the active material does not adhere to the surface of the current collector. Therefore, it is possible to form a portion where the active material layer is not formed in a necessary portion of the current collector without performing any treatment on the current collector in advance and without performing any post-treatment.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The “battery electrode” to which the method and apparatus for producing a battery electrode of the present invention can be applied is a battery electrode comprising a current collector and an active material layer formed on the surface of the current collector. Therefore, the “battery” is not particularly limited as long as it has an electrode in which an active material layer is formed on a current collector. For example, lithium ion secondary battery (aluminum positive electrode current collector: lithium-metal composite oxide, copper current collector: carbon material), nickel hydride secondary battery (Ni positive electrode current collector: NiOH, Ni negative electrode current collector) : A hydrogen storage alloy) or the like, and an electric double layer capacitor (aluminum current collector: carbon material).
[0019]
<Method for producing battery electrode>
The manufacturing method of the battery electrode according to the present embodiment includes an immersion process and an electrophoresis process.
[0020]
[Immersion process]
The dipping step is a step of dipping the current collector in a solution in which an active material is dispersed in a solvent. In this dipping process, the current collector may be dipped into the solution continuously as well as the whole.
[0021]
The active material is a material that varies depending on the battery in which the battery electrode is used. Moreover, any of a positive electrode active material and a negative electrode active material is applicable. The active material may be dissolved in a solvent, or may not be dissolved. When it is not soluble in the solvent, it is preferable that the particle diameter of the active material is small. This is because a denser active material layer can be formed. Moreover, you may add binders, such as PVDF and PTFE, as needed. The method for dispersing the active material in the solvent is not particularly limited, and examples thereof include ultrasonic irradiation, mechanical stirring using a stirring bar, and the like. In addition to the active material, various materials can be dissolved or dispersed in the solvent as necessary. For example, a binding material that binds the active material to the surface of the current collector, a conductive agent that imparts electrical conductivity, and the like. The solvent preferably contains a charging agent that charges the surface of the active material. This is because by controlling the withstand voltage state, it becomes easier to control the stacking of the active material on the current collector surface in the electrophoresis step described later. Examples of the charging agent include those that are ionized by being dissolved in a solvent, such as iodine, carboxylic acid, lithium carboxylate, and lithium imide salt. The concentration at which the active material is dispersed or dissolved in the solvent is not particularly limited. Since the charged state in the solvent varies depending on the type and state of the substance, the respective concentrations are adjusted so as to obtain a desired composition.
[0022]
The solvent is not particularly limited, but a solvent that is chemically and physically stable with respect to the current collector and the active material is preferable. For example, water, ketones such as acetone, alcohols and the like.
[0023]
[Electrophoresis step]
The electrophoresis step is a step in which an active material is electrophoresed in the solution by generating a potential gradient in the solution and adhered to the current collector surface. In this electrophoresis step, a shielding member disposed independently of the current collector that inhibits the electrophoresis of the active material to a predetermined portion on the surface of the current collector is used.
[0024]
As a method for generating a potential gradient in the solution, for example, it can be achieved by applying a voltage to two opposing electrodes. The shape of the electrode is preferably a shape in which the potential gradient of the portion through which the current collector passes in the solution can be made constant so that the active material uniformly adheres to the surface of the current collector. For example, the electrode is made large enough to cover the portion through which the current collector passes. And either one of the electrodes can serve as a current collector immersed in the solution. By using the current collector as an electrode, the active material can be directly attached to the current collector. Note that the direction of the potential gradient generated in the solution is determined by the charging potential in the solution of the active material or the like. That is, the potential gradient is determined so that the charged active material moves in the direction of the current collector. For example, when the active material is positively charged, the current collector is a negative electrode. Further, the number of electrodes is not limited to two, and may be three or more as necessary. For example, when an active material layer is to be formed on both sides of a current collector, the active material can be attached to both sides of the current collector by providing the current collector as a positive electrode and providing two negative electrodes on both sides of the current collector. it can.
[0025]
The conditions such as the voltage applied to the electrode and the voltage application time are not particularly limited, and are appropriately selected according to the thickness, porosity, composition, etc. of the active material layer to be formed on the current collector surface. When the voltage is increased, the active material layer becomes closer and the porosity becomes smaller. A preferable applied voltage when an iodine-added acetone solution is used as a solvent is about 5 to 500V. Further, when the voltage application time is increased, the active material layer on the current collector surface becomes thicker. In addition to the active material, the binder or the like dispersed in the solvent has different surface potential in the solution depending on its property, and the electrophoresis speed is different, so that the voltage applied to the electrode becomes the target active material layer composition. Adjust to. Note that the thickness of the active material layer formed on the current collector surface is preferably 50 μm or less, more preferably 25 μm or less per side of the current collector. This is because the thinner the active material layer, the lower the internal resistance of the battery and the higher output battery can be provided. Such a thin active material layer is difficult to form with high accuracy by a method in which an active material is applied to the surface of a current collector by a conventional die coater or the like. On the other hand, according to the electrophoresis method, the active material preferentially adheres to the portion where the potential gradient is large, so if the thickness of the active material layer is uneven, the active material adheres from the thin active material layer. Thus, there is an advantage that the thickness of the active material layer becomes constant.
[0026]
The shielding member is provided in the vicinity of a portion where the active material of the current collector is not desired to be adhered. The smaller the gap between the shielding member and the current collector, the less the active material wraps around unnecessary portions. The potential of the shielding member for preferably adjusted to a potential in the vicinity of the current collector in order to improve the shielding effect, the shielding member is Ru is adjusted to the same potential as the current collector. This is because by adjusting the potential, the potential gradient is reduced in the gap between the shielding member and the current collector, so that the active material is less attached to the current collector .
[0027]
Further, it is preferable to continue stirring of the solution by some method so that the active material in the solution does not precipitate in the electrophoresis step.
[0028]
<Battery electrode manufacturing equipment>
The battery electrode manufacturing apparatus according to the present embodiment includes a current collector sending unit, a solution tank, a voltage applying unit, a shielding member, and a current collector taking unit.
[0029]
The current collector sending means is a means for sending the current collector. Here, the “current collector” has the same meaning as the above-described current collector. As the current collector sending means, for example, there is a means for winding the current collector in a roll shape and sending the current collector as required.
[0030]
The solution tank is a member that holds a solution in which an active material is dispersed in a solvent and allows a current collector to pass through the solution. Here, “active material” and “solvent” are synonymous with the above-described active material and solvent. The size of the solution tank needs to be at least large enough to immerse the current collector active material layer in the solution. Moreover, it is preferable to provide a stirring device in the solution tank so that the dispersed active material does not precipitate. Examples of the stirring device include an ultrasonic generator and a stirring blade.
[0031]
The voltage application means is means for generating a potential gradient in the solution tank and causing the active material to be electrophoresed and adhered onto the current collector. Examples of the voltage applying means include means for applying a voltage using the plurality of electrodes described above. The electrodes are as described above.
[0032]
The shielding member is a member arranged independently of the current collector, and is a member that shields a predetermined portion of the current collector in the solution tank. The shielding member is the same as described above.
[0033]
The current collector taking-in means is a means for taking in the current collector with the active material attached thereto. Specifically, an apparatus for winding a current collector in a roll shape can be exemplified.
[0034]
In addition to these devices, appropriate means can be provided as necessary. For example, there is a drying means for drying the current collector wetted with the solution before the current collector taking means.
[0035]
【Example】
(Electrode plate manufacturing equipment)
The electrode plate was manufactured using the electrode plate manufacturing apparatus shown in FIG. The electrode plate manufacturing apparatus has a current collector sending means 1 for holding and sending a current collector 10 wound in a roll shape, a solution tank 2, and two electrode plates 31 and 32 provided in the solution tank 2. And the metal shielding plates 51 and 52 provided in the solution tank 2 with a gap about the thickness of the current collector 10 on the right side in the direction of travel of the current collector 10 between the electrode plates 31 and 32 and the electrode plates 31 and 32 The current collector 10 passes between the electrode plates 31 and 32 and the shield plates 51 and 52 and guides 6, 7, 8, and 9 that hold the current collector 10 so as to be immersed in the solution and the current collector that winds up the current collector 10. It consists of body taking-in means 4. Then, the negative electrode of the DC power source 90 capable of controlling the voltage is connected to the current collector 10 via the current collector sending means 1, and the positive electrode is connected to the electrode plates 31 and 32 and the shielding plates 51 and 52. Thereby, the shielding plates 51 and 52 and the current collector 10 are equipotential.
[0036]
Therefore, as shown in FIG. 2, the active material electrophoresed from the electrode plates 31 and 32 toward the current collector 10 is shielded by the shield plates 51 and 52. An active material layer is not formed. Since the shielding plates 51 and 52 are adjusted to the same potential as the current collector 10, the amount of the active material that flows between the shielding plates 51 and 52 and the current collector 10 can be reduced. In FIG. 2, A indicates an active material layer attached on the current collector.
[0037]
The current collector 10 held by the current collector sending means 1 passes through the solution tank 2 by the guides 6, 7, 8, 9 and is taken in by the current collector taking-in means 3.
[0038]
(Reference example)
Moreover, even if the electrode plate manufacturing apparatus shown in FIG. 3 is used, an electrode plate similar to the above-described manufacturing apparatus can be manufactured. The electrode plate manufacturing apparatus shown in FIG. 3 includes a current collector sending means 1 ′, a solution tank 2 ′, electrode plates 31 ′, 32 ′, guides 6 ′, 7 ′, 8 ′, 9 ′ and current collector taking-in. It comprises means 4 ′ and shielding plates 61 and 62. Regarding the current collector delivery means 1 ′, the solution tank 2 ′, the electrode plates 31 ′, 32 ′, the guides 6 ′, 7 ′, 8 ′, 9 ′ and the current collector take-in means 4 ′, the above-described manufacturing apparatus Is the same. The shielding plates 61 and 62 are made of an insulating material provided with a gap about the thickness of the current collector 10 on the right side between the electrode plates 31 ′ and 32 ′ in the traveling direction of the current collector 10. It is a member.
[0039]
Therefore, as shown in FIG. 4, the active material electrophoresed from the electrode plates 31 and 32 toward the current collector 10 is shielded by the shield plates 61 and 62. An active material layer is not formed. Since the shielding plates 61 and 62 spatially inhibit the movement of the active material, the amount of the active material layer attached to the surfaces of the shielding plates 61 and 62 is reduced.
[0040]
In the following examples, the electrode plate was manufactured using the former manufacturing apparatus.
[0041]
(Example 1-1)
[Manufacture of electrode plates]
An aluminum foil (thickness: 15 μm) was used as the current collector 10. The solution stored in the solution tank 2 used acetone as a solvent. In this solvent, LiNiO ₂ that is a positive electrode active material of a lithium ion secondary battery, carbon black that is a conductive material, and PTFE (polytetrafluoroethylene) that is a binder as active materials are each 10 parts per 1000 parts by weight of acetone. , 0.2 and 0.5 parts by weight were mixed. Further, 5 parts by weight of a 0.5 mol / L iodine acetone solution as a charging agent was added to 1000 parts by weight of acetone.
[0042]
These mixed solvents were sufficiently dispersed by ultrasonic dispersion for 5 minutes and then stored in the solution tank 2. The electrodes 31 and 32 were installed on both sides of the current collector with a distance of 10 mm. As an electrophoresis condition, the applied voltage is 400 V, and the time for performing electrophoresis is adjusted by adjusting the feeding speed of the current collector, and the time during which the current collector 10 exists between the electrodes 31 and 32 (electrophoresis time) is 1 minute. It was.
[0043]
(Evaluation of electrodes)
After the electrode (current collector 10) deposited by this manufacturing apparatus was dried, the thickness was measured with a micrometer, and the porosity was measured by a mercury intrusion method. As a result, the electrode was 44.1 μm on one side and the porosity was 48.6%. Had sufficient adhesive strength and flexibility. Moreover, as a result of measuring the curvature degree of an electrode, it was 1 mm / m or less. The electrode was further pressed by a roll press to a porosity of 38.0%. As a result, the electrode was bent into a fan shape, and the degree of curvature of the electrode was measured. As a result, it was 3 mm / m. As a method of measuring the degree of curvature, as shown in FIG. 5, the distance b at the center of the electrode, which is the portion farthest from the straight line connecting both ends of the electrode of length a (this time is 1 m), is measured. And calculated. The reason why the electrode is curved is that when the electrode is pressed, the portion A where the active material layer of the electrode is formed is thicker than the portion B where the active material layer is not formed. The load of the press is concentrated. As a result, the portion A expands and becomes longer in the lateral direction than the portion B, and the electrode is curved and deformed in a fan shape. The smaller the degree of curvature, the better the yield of the manufactured battery, and it can be wound at a higher speed.
[0044]
(Example 1-2)
In this example, an electrode was produced under the same conditions as in Example 1-1 except that the electrophoresis time was adjusted to 30 seconds by adjusting the feeding speed of the current collector. As a result, the thickness of the active material layer was 22.6 μm on one side and the porosity was 48.5%, which had sufficient adhesive strength and flexibility as an electrode. Furthermore, the degree of curvature of the electrode pressed to a porosity of 38.1% with a roll press was measured, and the result was 1 mm / m or less.
(Example 1-3)
In this example, an electrode was produced under the same conditions as in Example 1-1 except that pure water was used as a solvent, no charging agent was used, and the applied voltage of electrophoresis was set to 50V. As a result, the thickness of the active material layer is 18.8 μm on one side and the porosity is 39.6%, which is a porosity that can be used sufficiently as a battery electrode without pressing, and has sufficient adhesive strength and flexibility as an electrode. Had.
(Example 2-1)
In this example, graphite as a negative electrode active material of a lithium ion secondary battery as an active material and PVDF (polyvinylidene fluoride) as a binder were mixed at 10 and 0.5 parts by weight with respect to 1000 parts by weight of acetone, respectively. An electrode was produced under the same conditions as in Example 1-1 except that the solution was used and a 10 μm thick Cu foil was used as the current collector 10. As a result, the thickness of the active material layer was 47.0 μm on one side and the porosity was 39.1%, which had sufficient adhesive strength and flexibility as an electrode. Furthermore, the degree of curvature of the electrode pressed to a porosity of 33.8% by a roll press was measured and found to be 2 mm / m.
(Example 2-2)
In this example, an electrode was produced under the same conditions as in Example 2-1, except that the electrophoresis time was 30 seconds. As a result, the thickness of the active material layer was 23.6 μm on one side, the porosity was 39.0%, and the adhesive strength was sufficient as an electrode. Furthermore, the degree of curvature of the electrode pressed to a porosity of 33.8% with a roll press was measured and found to be 1 mm / m or less.
(Example 2-3)
In this example, an electrode was produced under the same conditions as in Example 2-1, except that pure water was used as a solvent and the applied voltage of electrophoresis was set to 50V. As a result, the thickness of the active material layer is 22.3 μm on one side and the porosity is 35.7%, which is a porosity that can be used sufficiently as a battery electrode without pressing, and has sufficient adhesive strength and flexibility as an electrode. Had.
(Example 3)
In this embodiment, graphite, which is a negative electrode active material of a lithium ion secondary battery, and PPO (polypropylene oxide), which is a polymer electrolyte, are mixed as active materials at 10 and 1 parts by weight, respectively, with respect to 1000 parts by weight of acetone. An electrode was produced under the same conditions as in Example 2-1, except that the prepared solution was used. As a result, the thickness of the active material layer was 46.8 μm on one side and the porosity was 38.9%, which had sufficient adhesive strength and flexibility as an electrode. Furthermore, the degree of curvature of the electrode pressed to a porosity of 33.9% with a roll press was measured and found to be 1 mm / m or less.
[0045]
In addition, by using PPO as a binder, it can be used as an electrode for a highly safe solid electrolyte battery or gel electrolyte battery.
(Comparative example)
This comparative example was manufactured by the coating method which is a conventional manufacturing method. First, a paste was prepared by mixing and stirring 93 and 7 parts by weight of graphite, which is the same negative electrode active material as in Example 2-1, and PVDF, which is a binder, with respect to 100 parts by weight of NMP solvent as a coating paste. . Using this paste, a comma coater was applied to adjust the gap width to the minimum that could prevent the occurrence of application streaks due to clogging of the active material. The thickness after drying at 120 ° C. was 112.2 μm on one side and the porosity was 52.0%. This coated electrode did not have sufficient adhesive strength as a wound electrode, and the electrode mixture was peeled off during the winding process. As a result of measuring the curvature of the electrode pressed to a porosity of 38.3% by a roll press in order to increase the adhesive strength, it was 10 mm / m.
[0046]
(Evaluation)
The thickness and composition of the active material layer to be deposited could be deposited with a desired thickness and composition by adjusting the applied voltage and the mixing ratio of the dispersoid of the mixed solution. Further, by using the electrophoresis method, a thin film electrode that cannot be produced by a conventional coating method such as a comma coater or a die coater has become possible. Since it can be deposited at a higher density, the porosity is equal to or higher than that of a conventional electrode obtained by pressing an electrode produced by a coating method. And it was equivalent to the conventional product also in adhesiveness and flexibility. The electrode produced by this electrophoresis method does not need to be pressed or can be processed to a desired density and porosity at a lower pressure than an electrode produced by a conventional coating method. The bending of the electrode due to the difference in elongation at the ends is suppressed, and a long electrode with excellent productivity can be provided for producing a wound electrode.
[0047]
【The invention's effect】
As described above, the battery electrode manufacturing method of the present invention can easily form a portion where the active material layer is not formed in the battery electrode manufacturing method in which the active material layer is formed by electrophoresis. It has the effect that the manufacturing method of the electrode for batteries can be provided.
[0048]
In addition, the battery electrode manufacturing apparatus of the present invention is an apparatus for manufacturing a battery electrode in which an active material layer is formed by electrophoresis, and can easily form a portion where no active material layer is formed. Another problem to be solved is to provide an electrode manufacturing apparatus.
[Brief description of the drawings]
FIG. 1 is a schematic view of an electrode manufacturing apparatus used in Examples.
FIG. 2 is a view showing a state of arrangement of an electrode plate and a shielding member of an electrode manufacturing apparatus used in an example.
FIG. 3 is a schematic view of another electrode manufacturing apparatus shown in the reference example.
FIG. 4 is a diagram showing a state of arrangement of an electrode plate and a shielding member of another electrode manufacturing apparatus shown in the reference example.
FIG. 5 is a diagram showing a method for measuring the curvature of an electrode plate.
FIG. 6 is a view showing a conventional electrode plate provided with a current collecting lead.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1 '... Current collector delivery means 10 ... Current collector A ... Current collector (active material layer formation part) B ... Current collector (active material layer non-formation part) 11 ... Current collection lead 2, 2' ... Solution tank 31, 32, 31 ', 32' ... Electrode plate 4, 4 '... Current collector taking means 51, 52 ... Shielding member (made of metal) 61, 62 ... Shielding member (made of insulating material)
6, 7, 8, 9, 6 ', 7', 8 ', 9' ... Guide 90 ... DC power supply

Claims (10)

An immersion step of immersing the current collector in a solution in which the active material is dispersed in a solvent;
Manufacturing an electrode for a battery having an electrophoretic process in which an active material is electrophoresed in the solution by generating a potential gradient in the solution, and the active material is attached to the surface of the current collector as an active material layer In the method
In the electrophoresis step, using a shielding member disposed independently of the current collector, which inhibits the electrophoresis of the active material to a predetermined portion of the current collector surface ,
The shielding member, manufacturing method of battery electrodes, wherein Rukoto adjusted to the current collector and the same potential.  2. The battery electrode according to claim 1, wherein the potential gradient is generated by at least two types of electrodes including a positive electrode and a negative electrode in the electrophoresis step, and one of the positive electrode and the negative electrode serves as the current collector. Manufacturing method.  In the electrophoresis step, the potential gradient is generated by at least two types of electrodes including a positive electrode and a negative electrode, and either the positive electrode or the negative electrode serves as the current collector, and the other serves as both surfaces of the current collector. The method for manufacturing a battery electrode according to claim 1, wherein one battery electrode is provided on each side. 4. The battery according to claim 1, wherein the electrophoresis step is a step of adjusting and attaching the active material layer to a surface of the current collector so that a thickness of the active material layer is 50 μm or less. 5. Electrode manufacturing method. The method for manufacturing a battery electrode according to claim 4, wherein the thickness of the active material layer is adjusted to be 25 μm or less. The method for producing a battery electrode according to claim 1, wherein the solution contains a charging agent that charges the surface of the active material. A battery electrode manufacturing apparatus comprising a current collector and an active material layer formed on the surface of the current collector,
  Current collector delivery means for delivering the current collector;
  A solution tank for holding a solution in which an active material constituting the electrode active material layer is dispersed in a solvent, and allowing the current collector to pass through the solution;
  A voltage applying means for generating a potential gradient in the solution tank and causing the active material to be electrophoresed and deposited on the current collector;
  A member disposed independently of the current collector, and a shielding member for shielding a predetermined portion of the current collector in the solution tank;
  Current collector taking-in means for taking in the current collector to which the active material is attached;
  The battery electrode manufacturing apparatus, wherein the shielding member is adjusted to the same potential as the current collector.  The battery application according to claim 7, wherein the voltage applying unit generates the potential gradient by at least two types of electrodes including a positive electrode and a negative electrode, and one of the positive electrode and the negative electrode serves as the current collector. Electrode manufacturing equipment.  The voltage application means generates the potential gradient by at least two kinds of electrodes including a positive electrode and a negative electrode, and one of the positive electrode and the negative electrode serves as the current collector, and the other serves as the current collector. The apparatus for manufacturing a battery electrode according to claim 7, wherein one device is provided on each of both surfaces.  The battery electrode manufacturing apparatus according to any one of claims 7 to 9, wherein the solution contains a charging agent that charges the surface of the active material.

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