JP2002361152A - Double-side coater and manufacturing method of electrode for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-side coater for applying a coating material to the both sides of a substrate, and a manufacturing method of an electrode for a nonaqueous electrolyte battery using the double-side coater. SOLUTION: This double-side coater is provided with a traveling means for making a belt-like substrate S, of which the both sides are to be coated with the coating material, run along a fixed route, a speeder roll 11 rotating in the direction opposite to the traveling direction of the substrate S and installed on one side of the substrate S for carrying out transfer coating thereon, a means 12 for supplying the coating material to the peripheral surface of the spreader roll 11, and a die nozzle coater 13 installed on the other side of the substrate S for coating the other side of the substrate S directly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-side coating device for applying a coating material on both sides of a substrate, and more particularly to a double-side coating device for applying an electrode mixture coating material on both surfaces of an electrode current collector. The present invention also relates to a method for producing an electrode for a non-aqueous electrolyte battery using the double-sided coating device.

[0002]

2. Description of the Related Art In recent years, as electronic devices such as various OA devices, VTR cameras, and mobile phones have become smaller and lighter, secondary batteries used as drive power supplies for these electronic devices have been required to be smaller and lighter and have higher performance. ing. In order to meet such demands, development of lithium ion secondary batteries as nonaqueous electrolyte batteries with high discharge potential and high discharge capacity has been rapidly promoted and put into practical use.

[0003] For each of the positive electrode and the negative electrode of a nonaqueous electrolyte battery, an electrode coating material (mixture) is generally prepared by mixing an electrode active material with a binder, and the electrode coating material is applied on one side of an electrode current collector. , Drying, subsequently, applying an electrode paint on the other surface of the electrode current collector, drying, forming a sheet-like electrode having an electrode active material layer on both sides of the electrode current collector, and then forming a sheet-like electrode It is manufactured by rolling an electrode and cutting it into predetermined dimensions.

[0004] However, in the method of sequentially applying and drying the electrode paint on one side at a time, when one side is dried in a drying furnace,
That the other side of the current collector that is not coated may be affected by the solvent, that the coating film is likely to be deformed, that coating and drying time is increased, and that cost is increased;
And so on.

For this reason, for example, Japanese Patent Application Laid-Open No. Hei 8-37005
The publication describes a method in which a pair of die head coaters equipped with a metering pump capable of controlling the discharge amount are arranged on both sides of the current collector, and the electrode paint is simultaneously applied to both sides of the current collector, followed by drying. Have been.

Japanese Patent Application Laid-Open No. H11-345608 discloses that
By passing a current collector through the gap between the application rolls rotating in opposite directions to each other in the direction opposite to the rotation direction of the application roll, the electrode paint supplied with a constant thickness by a measuring mechanism on each surface of the application roll is applied. A method is described in which transfer coating is performed on both sides of a current collector and then drying is performed.

However, in the methods described in both publications, an electrode paint is applied to both surfaces of the current collector and dried while the current collector is running vertically upward. The thickness of the electrode paint layer is as thick as about 40 to 400 μm even after drying and rolling, and it is difficult to form a uniform electrode paint layer in a vertical application due to the weight of the paint.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a double-side coating device for applying a coating material to both surfaces of a substrate, especially to both surfaces of an electrode current collector. It is an object of the present invention to provide a double-side coating device for applying an electrode mixture paint. Another object of the present invention is to provide a method for producing an electrode for a non-aqueous electrolyte battery using the double-sided coating device.

[0009]

According to the present invention, there is provided a running means for running a strip-shaped base material to be coated with a paint on both sides along a fixed path, and a running means provided on one side of the base material, For performing transfer coating on one surface, an application roll that rotates in a direction opposite to the traveling direction of the substrate, a unit that supplies a coating material to the peripheral surface of the application roll, and provided on the other surface side of the substrate. And a die nozzle coater for directly applying the other surface of the substrate to the other surface. In the double-side coating apparatus according to the present invention, one surface of the belt-shaped substrate to be moved is transferred and coated by a coating roll, and the other surface is directly coated by a die nozzle coater. Therefore, the paint can be applied to both sides of the substrate.

According to the present invention, the die nozzle coater is preferably arranged such that, based on the traveling direction of the base material, the one surface of the base material is the same as the position where the one surface of the base material is transferred and coated by the coating roll, the upstream position, or the downstream position. The above-mentioned double-side coating device is provided at a position. The position of the die nozzle coater is the position of the leading end discharge port directed to the substrate to be run.
In the double-side coating apparatus according to the present invention, the position of the direct coating by the die nozzle coater can be variously changed with respect to the position of the transfer coating by the coating roll, and an appropriate position is selected according to the embodiment.

In the present invention, the die nozzle coater is provided at a position slightly downstream from a position where the one surface of the base material is transferred and coated by a coating roll with reference to a running direction of the base material. , A double-sided coating device. In the double-side coating apparatus according to the present invention, one side of the substrate is transfer-coated, and immediately thereafter, the other side is directly coated by the die nozzle coater. Therefore, it is suitable when the substrate is a perforated substrate. That is, when the substrate is a perforated substrate,
If the direct application by the die nozzle coater is performed at a position upstream of the transfer application by the application roll, there is a disadvantage that the directly applied paint adheres to the peripheral surface of the application roll through the hole.

According to the present invention, there is provided an application roll, wherein the base material is maintained in a substantially horizontal state, the lower surface thereof is transferred and applied by an application roll, and the upper surface is directly applied by a die nozzle coater, and is further moved downstream. The above-described double-sided coating apparatus provided with a die nozzle coater and a traveling unit. In the double-sided coating apparatus according to the present invention, coating is performed on both sides of the base material which is in a substantially horizontal state. Therefore, there is no adverse effect due to the weight of the paint in the application in the vertical state, and a uniform paint layer can be formed.

[0013] The present invention is the double-sided coating apparatus described above, wherein the means for supplying the paint to the peripheral surface of the application roll is a die nozzle having a paint discharge head directed to the peripheral surface of the application roll.
The means for supplying the coating material to the peripheral surface of the application roll is not particularly limited, but in order to perform transfer coating on the lower surface of the base material in a substantially horizontal state, the coating material may be discharged from the die nozzle to the peripheral surface of the application roller. It is suitable.

According to the present invention, a strip-shaped base material to be coated with a paint on both sides is caused to travel along a fixed path, and one side of the base material has
A double-sided application method including transferring and applying a coating via an application roll rotating in a direction opposite to the traveling direction of the substrate, and directly applying the coating to the other surface of the substrate by a die nozzle coater. It is.

According to the present invention, a strip-shaped electrode current collector to be coated on both surfaces with an electrode mixture paint containing an electrode active material and a binder is caused to travel along a fixed path, and one side of the current collector is The electrode mixture paint is transferred and applied via an application roll rotating in the direction opposite to the running direction of the body, and the electrode mixture paint is directly applied to the other surface of the current collector by a die nozzle coater,
Forming an electrode mixture paint layer on both sides of the current collector, and then drying the electrode mixture paint layer on both sides to form a sheet-like electrode having an electrode active material layer on both sides of the electrode current collector And a method for producing a battery electrode. In this method, the direct coating is performed by a die nozzle coater at the same time as, before, or after the transfer coating by the coating roll.

According to the present invention, the current collector is a perforated current collector or a net-like current collector, and the electrode mixture paint is transferred and applied to one surface of the current collector via a coating roll. The method for producing an electrode for a battery according to the above, wherein the electrode mixture paint is directly applied to the other surface of the current collector by a die nozzle coater.

According to the present invention, the electrode current collector is placed in a substantially horizontal state, the electrode mixture paint is transferred and applied to the lower surface of the current collector via a coating roll, and the electrode mixture paint is applied to the upper surface of the current collector by a die nozzle coater. Apply directly, form an electrode mixture paint layer on both sides of the current collector, and then dry the electrode mixture paint layer on both sides while running the electrode current collector in a substantially horizontal state. This is a method for manufacturing an electrode.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a double-side coating apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a view schematically showing an example of a double-sided coating apparatus according to the present invention. FIG. 2 is a view schematically showing a main part of an example of a double-sided coating apparatus according to the present invention. FIG.
FIG. 4 is a view schematically showing a main part of another example of the double-sided coating apparatus of the present invention.

Referring to FIGS. 1, 2 and 3, the double-side coating apparatus of the present invention comprises an unwinding machine (1), a winding machine (2) and guide rollers (3) (4) appropriately arranged. ) (5), (6), (7), (8), a running means for the base material, which is mainly composed of a coating section, and a drying furnace (9) arranged downstream of the coating section.

The coating section includes a coating roll (11) provided on one side of the substrate (S) to be run, and a coating roll (11).
A die nozzle (12) for supplying paint to the peripheral surface and a die nozzle coater (13) provided on the other surface side of the substrate (S) are provided.

The die nozzle (12) has a liquid reservoir (12a) receiving a paint supply from a paint supply device (not shown) and a liquid reservoir (12a).
a) The die slit (12b) communicating with
(12c) is formed. The die nozzle (12) is arranged such that the tip discharge port (12c) keeps a constant interval with respect to the peripheral surface of the application roll (11).

The die nozzle coater (13) has a liquid reservoir (13a) that receives a paint supply from a paint supply device (not shown), a die slit (13b) communicating with the liquid reservoir (13a), and a discharge port (13c) at the tip end thereof. ) Are formed. Die nozzle coater (13)
Is a tip discharge port (13c) with respect to the substrate (S) to be run.
Are arranged at regular intervals.

The coating roll (11) and the guide roller (5) on the downstream side of the coating roll (11) keep the base material (S) in a substantially horizontal state, the lower surface thereof is transferred and coated by the coating roll (11), and the upper surface thereof is coated. It is arranged so as to be directly applied by the die nozzle coater (13) and to travel further downstream. Application roll
A drying furnace (9) is provided between (11) and the guide roller (5), and the coated base material is maintained in a substantially horizontal state.
(S) is to be dried.

Referring to FIG. 2 and FIG. 3, in the double-side coating apparatus of the present invention, the die nozzle coater (13) has a substantially horizontal state with respect to the traveling direction of the substrate (S). S) At the same position as the position where the lower surface is transferred and applied by the application roll (11), the upstream position, or the downstream position,
(13c) is provided to face.

FIG. 2 shows an example in which the tip discharge port (13c) of the die nozzle coater (13) is directed to a position upstream by a distance (L1) from a position where transfer coating is performed. Alternatively, the die nozzle coater (13) may be provided at a position further upstream.
For example, it may be provided at the position A and the position B indicated by the broken lines.

FIG. 3 shows an example in which the tip discharge port (13c) of the die nozzle coater (13) is directed to a position downstream by a distance (L2) from the transfer coating position. Alternatively, the die nozzle coater (13) may be provided at a position further downstream.
For example, it may be provided at a position C indicated by a broken line.

If the substrate is a normal one, the arrangement position of the die nozzle coater (13) is the same as the position where transfer coating is performed,
It may be either the upstream position (FIG. 2) or the downstream position (FIG. 3). However, die nozzle coater (13)
Is provided at a position where coating on the other side is performed while the paint layer on one side is wet, and the die nozzle coater
(13) is provided upstream of the drying furnace (9).

When the substrate is a perforated substrate or a net-like substrate,
As shown in FIG. 3, the tip outlet of the die nozzle coater (13) prevents the paint directly applied by the die nozzle coater (13) from adhering to the peripheral surface of the application roll (11) through holes or meshes. 13c) is directed to a position downstream of the position where the transfer coating is performed. However, the die nozzle coater (13) is used so that the coating on the upper side is performed while the paint layer on the lower side is wet.
Is provided upstream of the drying furnace (9).

The distance (L1) in FIG. 2 and the distance in FIG.
(L2) is not particularly limited, and any value can be selected according to the diameter of the application roll (11), the viscosity of the coating material, and the like. For example, in order to perform the application while keeping the electrode current collector in a substantially horizontal state, when the diameter of the application roll (11) is about 100 mm, the distance (L1) and the distance (L2) may be about 1 to 30 mm.

The wound base material (S) is unwound (1)
The coating roller (11), which rotates in the direction opposite to the running direction of the substrate (S) while being tensioned in the longitudinal direction while being sent out from the base, and the discharge port (13c) at the tip of the die nozzle coater (13)
, And the coating material is applied to both sides of the substrate (S). That is, the paint is transferred and applied to the lower surface of the substrate (S) by the application roll (11), and the paint discharged from the tip outlet (13c) of the die nozzle coater (13) is directly applied to the upper surface. Base material with paint layers formed on both sides
The (S) subsequently passes through the drying furnace (9) in a substantially horizontal state, and is then wound up by a winder (2).

In the present invention, in order to carry out drying in a substantially horizontal state, there is no particular limitation, but the following drying oven is preferably used.

A plurality of clips for sandwiching both side edges of a strip-shaped base material having a paint layer formed on both sides by coating, and running the clips so that the base material can be run while maintaining a substantially horizontal state; A drying furnace for producing a double-sided coated body, comprising: a clip running means arranged on both sides of a base material; and a heat supply means for drying a paint layer on the run base material.

The clip running means includes a pair of sprocket wheels arranged on the upstream side and the downstream side in the substrate running direction, and a continuous chain circulating between the pair of sprocket wheels. The drying furnace for producing a double-sided coated body described above, wherein clips are attached at intervals.

In the above-mentioned drying furnace, the strip-shaped base material having the paint layer to be dried on both sides is clipped at both ear ends, and the inside of the drying furnace is kept in a state where both paint layers are not in contact with each other. You can run. Therefore, it is suitable for drying a substrate having a paint layer on both sides. Further, since the base material is allowed to travel while maintaining a substantially horizontal state, there is no adverse effect due to the weight of the paint in drying in the vertical state, and a uniform paint layer can be formed.

FIG. 4 is a plan view schematically showing an example of the preferred drying furnace. In the following description, the left and right sides will be referred to as left and right when viewed from the upstream side to the downstream side in the traveling direction of the electrode current collector as the base material.

Referring to FIG. 4, a preferred drying oven (9) is provided with a left and right ear end (Sl) of a strip-shaped electrode current collector (S) on which an electrode mixture paint layer (Sc) to be dried is formed. ) (Sr)
Multiple clips (21) (22) arranged on each side
And the clips (21) and (22) are moved so that the electrode current collector (S) can be run while maintaining a substantially horizontal state.
(S) Clip running devices located on both left and right sides
(23) and (24) and a heat supply device (not shown).

The clip traveling devices (23) and (24) are respectively
A pair of sprocket wheels (25), (26), (27), (28) arranged in parallel to the traveling direction on the upstream and downstream sides of the electrode current collector traveling direction indicated by arrows in the drawing, and a pair of sprockets A continuous chain (29), (30) that is circulated between wheels (25), (26), (27), (28). The sprocket wheels (25) (26), (27) (28) are installed at the same height. Sprocket wheels (26), (2
A motor (not shown) is attached to 8), and the motor drives sprocket wheels (26) and (28). The upstream sprocket wheels (25) and (27) are provided with a tensioner (not shown) for adjusting elongation and slack of the continuous chains (29) and (30), for example, an air cylinder facing upstream. I have. A plurality of clips (21) and (22) are attached to the continuous chains (29) and (30) at predetermined intervals by appropriate fixing members.

The heat supply device in the drying furnace (9) is not particularly limited, and a hot air supply device capable of controlling the drying temperature of the electrode mixture paint layer (Sc) may be used. As the hot-air supply device, for example, a hot-air blowing nozzle appropriately arranged in the drying furnace (9) so as to face the upper or lower surface of the electrode current collector (S) is generally used. The nozzle is connected via a duct to a heater and a blower provided outside the drying furnace (9).

The rotation of the driving sprocket wheels (26) and (28) causes the driven sprocket wheels (25) and (27) to rotate, and the continuous chains (29) and (30) cause the sprocket wheels (25) ( It can be circulated in the horizontal plane between 26), (27) and (28). As a result, the clips (21), (22)
The strip-shaped electrode current collector (S) having the left and right ear ends (Sl) and (Sr) sandwiched therebetween is run in the drying furnace (9) while maintaining a substantially horizontal state. Hot air is blown from nozzles on the upper and lower surfaces of the electrode current collector (S) while the electrode current collector (S) is running in the drying furnace (9), and the electrode mixture paint layer (Sc) is dried.

The length of the drying furnace (9), the electrode current collector (S)
The running speed, drying temperature, etc. of the electrode mixture paint layer to be dried
It is appropriately determined in consideration of the solvent content of (Sc), the type of the solvent, the thickness of the paint layer, and the like.

In this drying oven, since the drying is performed in a non-contact state on both the upper and lower surfaces of the strip-shaped electrode current collector, it is suitable for drying the electrode current collector having the electrode mixture paint layer formed on both surfaces. Further, since the electrode current collector is run while being kept in a substantially horizontal state in the drying furnace and drying is performed, there is no adverse effect due to the weight of the paint in drying in the vertical state, and the electrode mixture paint layers on the upper and lower surfaces are simultaneously formed. Since the coating is dried, deformation of the coating film hardly occurs, and uniform coating layers on both upper and lower surfaces are formed. Therefore, this drying oven is very suitable for drying an electrode current collector having both sides coated with an electrode mixture paint layer having a large thickness and weight.

The present invention also relates to a method for producing an electrode for a non-aqueous electrolyte battery using the double-side coating device. In the method of the present invention, first, an electrode active material and a binder are mixed with a solvent to prepare a slurry electrode mixture paint. At this time, a conductive agent or an additive may be further added as necessary.

The electrode active material is not particularly limited as long as it has been conventionally used as an electrode active material, and various materials can be used. As the positive electrode active material,
For example, an oxide or a carbon material capable of doping / dedoping lithium ions can be used. Examples of such an oxide include a composite oxide containing lithium, for example, lithium cobalt oxide Li _x CoO ₂ (0 <x ≦
1.0), lithium manganate Li _{1 + x} Mn _2-x O
₄ (0 ≦ x ≦ 1/3), lithium nickelate Li _x Ni
O ₂ (0 <x ≦ 1.0). The average particle size of these oxide powders is preferably about 1 to 40 μm.

As the negative electrode active material, for example, carbonaceous materials, lithium metals, lithium alloys, and oxides such as tin oxide are used. The carbonaceous material is not particularly limited, and examples thereof include amorphous carbon, acetylene black, petroleum coke, coal coke, artificial graphite, natural graphite, graphite-based carbon fiber, and non-graphitizable carbon. . Those skilled in the art can appropriately select from these in accordance with the characteristics of the intended battery.

The binder for the electrode paint is not particularly limited, and various binders such as a crystalline resin and an amorphous resin which have been conventionally used can be used. For example, as a binder, polyacrylonitrile (PAN), polyethylene terephthalate, polyvinylidene fluoride (PVDF), polyvinyl fluoride,
A fluorocarbon-based resin such as fluororubber can be used. The binder is used in an amount of usually 1 to 40 parts by weight, preferably 2 to 25 parts by weight, particularly preferably 5 to 15 parts by weight, based on 100 parts by weight of the electrode active material.

The solvent for the electrode paint is not particularly limited, and various solvents conventionally used for preparing the electrode paint can be used. For example, N-methylpyrrolidone (NMP), methyl isobutyl ketone (MIBK), methyl ethyl ketone (ME
K), cyclohexanone, toluene and the like.

The conductive agent can be added, if necessary, for the purpose of supplementing the electron conductivity of the electrode active material.
The conductive agent is not particularly limited, and various known conductive agents may be used. For example, acetylene black, graphite, gold / silver / copper fine particles and the like can be mentioned.
Further, various known additives such as lithium carbonate, oxalic acid, and maleic acid can also be added.

The mixing of the electrode active material, the binder, the conductive agent, the solvent and the like can be performed by a conventional method. For example, mixing is performed under dry air or an inert gas atmosphere by a roll mill method.

Next, the obtained slurry-like electrode coating was
The two-sided coating device of the present invention is used to coat both sides of the strip-shaped electrode current collector.

In the present invention, as the electrode current collector, a metal foil, a metal sheet, a punched metal, a metal net, and the like are used, and a metal foil and a punched metal are preferable. The metal material of the electrode current collector is not particularly limited, and various metal materials conventionally used for the electrode current collector can be used. Examples of such a metal material include copper, aluminum, stainless steel, nickel, iron and the like, and copper, aluminum and the like are preferable.
The thickness of the electrode current collector is usually 1 to 30 μm, preferably 5 to 30 μm.
２０20 μm.

In the case where the electrode current collector is a perforated current collector such as a punching metal or a net current collector such as a metal net, one side of the current collector is subjected to transfer coating by a coating roll and then to the other side. Is directly applied by a die nozzle coater.

Following application of the electrode paint, drying is performed to remove the solvent. The drying is preferably performed while the electrode current collector is running in a substantially horizontal state. Drying in a substantially horizontal state can be performed using the above-described suitable drying oven. By drying in a substantially horizontal state, the paint layers formed on both surfaces of the current collector do not deform, and the uniformity of the paint layers on both surfaces can be maintained. For example, at 30 to 150 ° C, 5 to 1
Dry for about 5 minutes. Thus, the electrode active material layers are formed on both surfaces of the electrode current collector.

After drying, the electrode current collector on which the electrode active material layer is formed is rolled by a roller press to make the thickness of the electrode active material layer thin and uniform, and to reduce the density of the active material per electrode volume. Enhance. The pressing pressure at this time is 5 to 1000
It is about kg / cm. The thickness (as one side) of the electrode active material layer is not particularly limited, but is about 40 to 400 μm, depending on the use.

After the rolling, the sheet electrode is cut into a predetermined size. The cutting generally includes a slitting step of making the electrode a predetermined width along the manufacturing flow direction, and a cutting step of making the electrode a desired length. Further, the slitting process may be performed before the rolling process, and the rolling process may be performed after the slitting process.

[0055]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but it should not be construed that the invention is limited thereto. [Example 1: Production of positive electrode] A slurry-like positive electrode coating material having the following composition was prepared.

(Composition of Coating Material for Positive Electrode) Positive electrode active material: 100 parts by weight of lithium cobaltate Conductive agent: 6.7 parts by weight of acetylene black Binder: 4.4 parts by weight of polyvinylidene fluoride (PVDF) Solvent: N-methylpyrrolidone ( NMP) 73 parts by weight

First, 4.4 parts by weight of the binder was added to NMP4
It was dissolved in 0 parts by weight to prepare a lacquer. Next, 44.4 parts by weight of the lacquer was added to and mixed with 6.7 parts by weight of the conductive agent and 100 parts by weight of lithium cobalt oxide powder, and then 33 parts by weight of NMP was added to the kneaded material to prepare a positive electrode coating material. And

Referring to FIG. 2, the application roll (11) has a diameter of 10
A double-sided coating apparatus was used in which the distance L1 between the leading end discharge port (13c) of the die nozzle coater (13) and the transfer coating position was 5 mm.

After coating the above positive electrode coating material on both surfaces of a 20 μm-thick strip-shaped electrode current collector made of aluminum foil,
In the drying oven (9) shown in FIG.
Drying speed of 80 to 130 ° C while running at a speed of
For 5 minutes to form electrode active material layers on both surfaces. The positive electrode after the drying step was rolled with a roller press to obtain a sheet-shaped positive electrode having a thickness of the electrode active material layer on one side of 86 μm. The thickness of the obtained active material layers on both surfaces was uniform.

Example 2 Production of Positive Electrode Referring to FIG. 3, a coating roll (11) having a diameter of 40 mm and a die nozzle coater (1
The distance L2 between the tip discharge port (13c) of 3) and the transfer coating position
Was set to 5 mm.

Next, on both surfaces of a perforated band-shaped electrode current collector (a hole having a diameter of 0.3 mm: an opening ratio of 50%) made of a 20 μm-thick aluminum foil, the one used in Example 1 was used. After applying the same coating material for the positive electrode, the electrode current collector was dried in a drying oven at 80 to 130 ° C. while running the electrode current collector in a horizontal state, as in Example 1, to form electrode active material layers on both surfaces. The coating did not adhere to the peripheral surface of the application roll (11) even after continuous application for 0.5 hours. The positive electrode after the drying step was rolled with a roller press to obtain a sheet-shaped positive electrode having a thickness of the electrode active material layer on one side of 86 μm. The thickness of the obtained active material layers on both surfaces was uniform.

[0062]

According to the double-side coating apparatus of the present invention, the coating material can be efficiently applied to both sides of the substrate, and a coating layer having a uniform thickness can be formed. The double-sided coating apparatus of the present invention is applicable whether the substrate is a perforated substrate or a mesh substrate.

In particular, the double-side coating device of the present invention is suitably used in a step of applying an electrode paint in the production of an electrode for a non-aqueous electrolyte battery. By using this double-sided coating apparatus, an electrode active material layer having a uniform thickness can be formed in a single coating step. Compared with the conventional one-sided sequential application / drying process, the manufacturing process time can be significantly reduced, and the electrode active material layer having a uniform thickness is formed. Is obtained.

In particular, the double-side coating apparatus of the present invention is applicable to double-side coating on various types of electrode current collectors by adjusting the position of a die nozzle coater. There is a great advantage that both sides can be easily applied to a perforated electrode current collector and a reticulated electrode current collector.

[Brief description of the drawings]

FIG. 1 is a view schematically showing an example of a double-sided coating apparatus according to the present invention.

FIG. 2 is a diagram schematically illustrating a main part of an example of a double-sided coating apparatus according to the present invention.

FIG. 3 is a view schematically showing a main part of another example of the double-sided coating apparatus of the present invention.

FIG. 4 is a plan view schematically showing an example of a preferred drying oven of the present invention.

[Explanation of symbols]

 (S): Substrate (1): Unwinder (2): Winder (3) (4) (5) (6) (7) (8): Guide roller (9): Drying furnace (11) : Application roll (12): Die nozzle (12a): Liquid reservoir (12b): Die slit (12c): Tip discharge port (13): Die nozzle coater (13a): Liquid reservoir (13b): Die slit (13c): Tip outlet

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 4/04 H01M 4/04 AZ (72) Inventor Seiichi Endo 1-113 Nihonbashi, Chuo-ku, Tokyo No. 1 FDC term in TDK Corporation (reference) 4D075 AC02 AC72 AC88 AE24 DA04 DB31 DC18 EA60 4F040 AA22 AB05 AC02 4F041 AA12 AB01 4F042 AA22 DB02 DF01 5H050 AA19 BA16 CA08 CB07 CB12 DA04 EA10 EA12 GA29

Claims (9)

[Claims] 1. A running means for running a strip-shaped base material to be coated with a paint on both sides along a fixed path, and provided on one surface side of the base material and performing transfer coating on said one surface of the base material. An application roll rotating in a direction opposite to the running direction of the substrate, a means for supplying a coating material to the peripheral surface of the application roll, and the other surface of the substrate provided on the other surface of the substrate. And a die nozzle coater for performing coating directly on the substrate. 2. The die nozzle coater is located at the same position, upstream position, or downstream position as the position where the one surface of the base material is transferred and coated by the coating roll with reference to the running direction of the base material. The double-sided coating device according to claim 1, which is provided. 3. The die nozzle coater is provided at a position slightly downstream from a position where the one surface of the base material is transferred and coated by a coating roll with respect to a running direction of the base material. Item 3. The double-side coating device according to Item 1 or 2. 4. An application roll and a die nozzle so that the base material is kept substantially horizontal, the lower surface is transferred and applied by an application roll, and the upper surface is directly applied by a die nozzle coater and further moved downstream. 4. The method according to claim 1, wherein a coater and a traveling means are provided.
Item 2. A double-sided coating device according to Item 1. 5. The double-sided surface according to claim 1, wherein the means for supplying the coating material to the coating roll peripheral surface is a die nozzle having a coating material discharge head directed to the coating roll peripheral surface. Coating device. 6. A strip-shaped base material to be coated with a coating material on both sides is caused to travel along a fixed path, and one side of the base material is provided on a surface of the base material via an application roll which rotates in a direction opposite to a running direction of the base material. A double-sided coating method comprising transferring a coating material and applying the coating material directly to the other surface of the substrate by a die nozzle coater. 7. A strip-shaped electrode current collector to be coated on both sides with an electrode mixture paint containing an electrode active material and a binder is caused to travel along a fixed path, and one side of the current collector is provided with a current collector. The electrode mixture paint is transferred and applied via an application roll rotating in the direction opposite to the running direction, and the electrode mixture paint is directly applied to the other surface of the current collector by a die nozzle coater, and the current is collected. A battery comprising: forming an electrode mixture paint layer on both surfaces of a body; thereafter, drying the electrode mixture paint layers on both surfaces to form a sheet-like electrode having electrode active material layers on both surfaces of an electrode current collector. Method of manufacturing electrodes. 8. The current collector is a perforated current collector or a net current collector, and the electrode mixture paint is transferred and applied to one surface of the current collector via an application roll. The method for producing an electrode for a battery according to claim 7, wherein the electrode mixture paint is directly applied to the other surface of the body by a die nozzle coater. 9. The electrode current collector is placed in a substantially horizontal state, and an electrode mixture paint is transferred and applied to the lower surface of the current collector via an application roll,
An electrode mixture paint is directly applied to the upper surface of the current collector by a die nozzle coater, and an electrode mixture paint layer is formed on both surfaces of the current collector,
The method for producing a battery electrode according to claim 7 or 8, wherein the electrode mixture paint layers on both sides are dried while the electrode current collector is running in a substantially horizontal state.