Method for manufacturing all-solid-state battery

Abstract

The present invention provides a method for manufacturing an all-solid-state battery capable of accurately transferring a solid electrolyte layer to a positive electrode layer. The method for manufacturing an all-solid-state battery (1) is a method for manufacturing an all-solid-state battery (1) by pressing a first solid electrolyte layer (SE1) onto a positive electrode side sheet member (300), comprising: a transfer step (S21) for transferring the first solid electrolyte layer (SE1) onto the positive electrode side sheet member (300); and a positive electrode pressing step (S5) for densifying the first solid electrolyte layer (SE1) transferred in the transfer step (S21) and the positive electrode side sheet member (300) on the same production line.

Description

Technical Field

[0001] This invention relates to a method for manufacturing an all-solid-state battery. Background Technology

[0002] In recent years, research and development related to secondary batteries that help improve energy efficiency has been underway in order to ensure that more people have access to affordable, reliable and sustainable advanced energy.

[0003] Previously, as a method for manufacturing all-solid-state batteries, there is a known method of manufacturing them by pressing the positive electrode layer, the solid electrolyte layer and the negative electrode layer with rollers (for example, Patent Document 1).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-161471 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the solid-state battery manufacturing method described in Patent Document 1, the solid electrolyte layer is transferred to the positive electrode layer by pressing a sheet with a solid electrolyte layer onto the positive electrode layer, but the transfer accuracy of the solid electrolyte layer may be reduced.

[0009] This invention provides a method for manufacturing an all-solid-state battery capable of precisely transferring a solid electrolyte layer to the positive electrode layer. Furthermore, it contributes to improved energy efficiency.

[0010] Methods for solving problems

[0011] One aspect of the present invention is a method for manufacturing an all-solid-state battery, which is a method for manufacturing an all-solid-state battery by pressing a solid electrolyte layer onto a sheet-like component on the positive electrode side, comprising:

[0012] The transfer step involves transferring the solid electrolyte layer onto the positive electrode-side sheet member; and

[0013] In the positive electrode pressing step, on the same production line, the solid electrolyte layer transferred in the transfer step is densified with the positive electrode side sheet member.

[0014] Invention Effects

[0015] According to the present invention, a solid electrolyte layer can be precisely transferred to the positive electrode layer. Furthermore, it can also help improve energy efficiency. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view showing an example of an all-solid-state battery 1.

[0017] Figure 2 This is a diagram illustrating an example of a pressing apparatus 100 for an all-solid-state battery 1 in a manufacturing embodiment.

[0018] Figure 3 This is a diagram showing a portion of the pressing device 100, and in particular an example illustrating the transfer of the first solid electrolyte layer SE1.

[0019] Figure 4 This is a schematic diagram illustrating an example of the extension roller 110.

[0020] Figure 5 This is a diagram showing a portion of the pressing device 100, and in particular an example of the transfer of the intermediate layer transfer roller 150 and the negative electrode side transfer roller 160.

[0021] Figure 6 This is a flowchart illustrating an example of a method for manufacturing an all-solid-state battery 1.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. All-solid-state battery

[0024] 10 electrodes

[0025] 21. Negative electrode active material layer

[0026] 22a Negative electrode current collector foil

[0027] 41 Positive electrode active material layer

[0028] 42a Positive current collector foil

[0029] 120 First positive electrode side transfer roller (transfer roller)

[0030] 123 Substrate sheet (substrate)

[0031] 190 Positive electrode pressure roller

[0032] 300 Positive electrode side plate-shaped component

[0033] 310 Negative electrode side plate-shaped component

[0034] SE1 First Solid Electrolyte Layer (Solid Electrolyte Layer)

[0035] SE3 negative electrode side solid electrolyte layer

[0036] S1 Positive electrode side plate component conveying steps

[0037] S3 Peeling Step

[0038] S4 Tension Control Steps

[0039] S5 Positive Electrode Suppression Steps

[0040] S8 Solid electrolyte layer transfer steps on the negative electrode side

[0041] S9 Negative Electrode Side Sheet Component Lamination Steps

[0042] S10 Integrated Pressing Steps

[0043] S21 Transfer Steps. Detailed Implementation

[0044] Hereinafter, an embodiment will be described with reference to the accompanying drawings. First, before describing the manufacturing method of the all-solid-state battery 1, the structure of the all-solid-state battery 1 and the structure of the pressing apparatus 100 used in the manufacturing of the all-solid-state battery 1 will be described.

[0045] [All-solid-state battery]

[0046] Figure 1 This is a schematic diagram illustrating an example of an all-solid-state battery 1. The all-solid-state battery 1 has an electrode 10 having a negative electrode layer 2, a solid electrolyte layer 3, and a positive electrode layer 4 stacked on top of each other. In an embodiment, as... Figure 1 As shown, the stacked structure of the all-solid-state battery 1 is described using the following configuration: negative electrode layer 2, solid electrolyte layer 3, positive electrode layer 4, solid electrolyte layer 3, and negative electrode layer 2 stacked sequentially. However, the structure of the all-solid-state battery 1 is not limited to the above description. For example, the all-solid-state battery 1 can be constructed in other ways besides... Figure 1 In addition to the electrode 10 shown, it may also have an outer casing or other structures that can be used in solid-state batteries.

[0047] The solid electrolyte layer 3 in the all-solid-state battery 1 has at least a first solid electrolyte layer SE1 disposed on one side of the positive electrode layer 4 and a negative electrode-side solid electrolyte layer SE3 disposed on one side of the negative electrode layer 2. The solid electrolyte layer 3 may also have a second solid electrolyte layer SE2 disposed adjacent to the first solid electrolyte layer SE1. In this embodiment, the case where the solid electrolyte layer 3 is composed of the above three layers will be described. An intermediate layer 5 may also be arbitrarily disposed between the negative electrode layer 2 and the solid electrolyte layer 3.

[0048] There are no particular limitations on the all-solid-state battery 1; it can be a lithium-ion solid-state rechargeable battery or a lithium metal rechargeable battery.

[0049] (Negative electrode layer)

[0050] The negative electrode layer 2 comprises a negative electrode active material layer 21 and a negative electrode current collector layer 22. The negative electrode active material layer 21 is not particularly limited and can be composed of any material suitable for use as a negative electrode active material in the all-solid-state battery 1. Examples of negative electrode active materials constituting the negative electrode active material layer 21 include: lithium metal; lithium alloys; silicon-based active materials such as Si and Si alloys; and lithium titanate (Li4Ti5O4). 12 Lithium transition metal oxides such as TiO2, Nb2O3 and WO3; metal sulfides; metal nitrides; carbon materials such as graphite, soft carbon and hard carbon; metal indium, etc.

[0051] In addition to the above, the negative electrode active material layer 21 may also contain materials that can be contained in the negative electrode active material layer 21 of the all-solid-state battery 1. Examples of such materials include solid electrolytes, conductive additives, and binders. Examples of solid electrolytes include substances that are the same as those contained in the solid electrolyte layer 3 described later. Examples of conductive additives include carbon black, natural graphite, carbon fibers, and carbon nanotubes. Examples of binders include nitrile polymers, polyester polymers, acrylic polymers, cellulose polymers, styrene polymers, styrene-butadiene polymers, vinyl acetate polymers, polyurethane polymers, and vinyl fluoride polymers.

[0052] The negative electrode current collector layer 22 is not particularly limited and can be made of copper, nickel, or stainless steel. The shape of the negative electrode current collector layer 22 can be, for example, foil, plate, mesh, non-woven fabric, or foam. In this embodiment, the negative electrode current collector layer 22 is composed of a negative electrode current collector foil 22a.

[0053] (Solid electrolyte layer)

[0054] A solid electrolyte layer 3 is formed between the negative electrode layer 2 and the positive electrode layer 4. In an embodiment, the solid electrolyte layer 3 has a structure in which a first solid electrolyte layer SE1, a second solid electrolyte layer SE2, and a negative electrode side solid electrolyte layer SE3 disposed on one side of the negative electrode layer are stacked sequentially.

[0055] The first solid electrolyte layer SE1 is disposed in contact with the positive electrode active material layer 41 in the positive electrode layer 4. The solid electrolyte constituting the first solid electrolyte layer SE1 is not particularly limited, as long as it is a material suitable for use as an electrolyte in a solid-state battery. Examples include sulfide solid electrolytes, oxide solid electrolytes, halide solid electrolytes, inorganic solid electrolytes containing lithium salts, and polymer-based solid electrolytes such as polyethylene oxide. One or more of the above-mentioned solid electrolytes may be used.

[0056] Furthermore, the first solid electrolyte layer SE1 contains a binder in addition to the solid electrolyte material. The same binder that can be used in the negative electrode active material layer 21 can be used as the binder. The mass content of the binder in the first solid electrolyte layer SE1 relative to the total mass of the first solid electrolyte layer SE1 is greater than or equal to the mass content of the binder in the second solid electrolyte layer SE2 relative to the total mass of the second solid electrolyte layer SE2. The upper limit of the binder content in the first solid electrolyte layer SE1 is, for example, 25% by mass. The binder content in the first solid electrolyte layer SE1 is preferably 10% to 30% by mass. Therefore, during the pressing of the positive electrode layer 4, the first solid electrolyte layer SE1 easily extends along with the positive electrode layer 4.

[0057] In addition, the first solid electrolyte layer SE1 may contain materials suitable for solid-state batteries, in addition to solid electrolyte materials and binders.

[0058] Furthermore, the thickness (length in the stacking direction of each layer) of the first solid electrolyte layer SE1 is preferably thinner than the thickness of the second solid electrolyte layer SE2. The thickness of the first solid electrolyte layer SE1 is preferably, for example, 3 μm to 15 μm.

[0059] The second solid electrolyte layer SE2 is an arbitrarily configured layer, disposed adjacent to the first solid electrolyte layer SE1. The solid electrolyte material constituting the second solid electrolyte layer SE2 is not particularly limited and can be the same material as the solid electrolyte material constituting the first solid electrolyte layer SE1. Similar to the first solid electrolyte layer SE1, the second solid electrolyte layer SE2 may contain, in addition to the solid electrolyte material, a binder, etc. The content of the binder in the second solid electrolyte layer SE2 is less than or equal to the content of the binder in the first solid electrolyte layer SE1. The content of the binder in the second solid electrolyte layer SE2 is preferably, for example, 10% to 30% by mass. This improves the energy density of the all-solid-state battery 1. The second solid electrolyte layer SE2 may also include a support. The support can be a three-dimensional structure such as a mesh, woven fabric, nonwoven fabric, embossed body, perforated body, stretched body, or foam. The second solid electrolyte layer SE2 may also not include the aforementioned support.

[0060] The thickness (length in the stacking direction of each layer) of the second solid electrolyte layer SE2 is preferably greater than the thickness of the first solid electrolyte layer SE1. Furthermore, the thickness of the second solid electrolyte layer SE2 is preferably greater than the thickness of the negative electrode-side solid electrolyte layer SE3, as described later. The thickness of the second solid electrolyte layer SE2 is preferably, for example, from 10 μm to 50 μm.

[0061] The solid electrolyte layer SE3 on the negative electrode side is disposed on one side of the negative electrode layer. The solid electrolyte layer SE3 on the negative electrode side is disposed adjacent to the negative electrode layer 2. Figure 1 As shown, in the case of the all-solid-state battery 1 having an intermediate layer 5, the solid electrolyte layer SE3 on the negative electrode side can also be configured adjacent to the intermediate layer 5.

[0062] The solid electrolyte material constituting the negative electrode side solid electrolyte layer SE3 is not particularly limited and can be the same material as the solid electrolyte material constituting the first solid electrolyte layer SE1. The content of the binder in the negative electrode side solid electrolyte layer SE3 is preferably, for example, 1.3% to 8.7% by mass. In volume percentage, the content of the binder in the negative electrode side solid electrolyte layer SE3 is preferably, for example, 2.7% by volume or more and 10% by volume or less. The content of the binder in the negative electrode side solid electrolyte layer SE3 is less than the content of the binder in the first solid electrolyte layer SE1.

[0063] The thickness (length in the stacking direction of each layer) of the negative electrode side solid electrolyte layer SE3 is preferably thinner than the thickness of the second solid electrolyte layer SE2. The thickness of the negative electrode side solid electrolyte layer SE3 is preferably, for example, 3 μm to 8.5 μm.

[0064] (Positive electrode layer)

[0065] The positive electrode layer 4 has a positive electrode active material layer 41 and a positive electrode current collector layer 42. In one embodiment, the positive electrode layer 4 has a structure in which two positive electrode active material layers 41 are stacked on both sides of a positive electrode current collector layer 42. Furthermore, the structure of the positive electrode layer 4 is not limited to that described above, and it may also have a structure in which one positive electrode active material layer 41 is stacked on one side of a positive electrode current collector layer 42.

[0066] The positive electrode active material layer 41 is not particularly limited and can be composed of a material that can be used as a positive electrode active material in a solid-state battery. Examples of positive electrode active materials constituting the positive electrode active material layer 41 include: LiCoO2, LiNiO2, and LiCo. x Ni y Mn z Layered positive electrode active material particles such as O2 (x + y + z = 1), LiVO2, and LiCrO2; LiMn2O4, Li(Ni) 0.25 Mn 0.75Spinel-type positive electrode active materials such as Li₂O₄, LiCoMnO₄, and Li₂NiMn₃O₈; olivine-type positive electrode active materials such as LiCoPO₄, LiMnPO₄, and LiFePO₄; solid solution oxides (Li₂MnO₃-LiMO₂ (M=Co, Ni, etc.)); conductive polymers such as polyaniline and polypyrrole; sulfides such as Li₂S, CuS, Li-Cu-S compounds, TiS₂, FeS, MoS₂, and Li-Mo-S compounds; and mixtures of sulfur and carbon, etc. The above-mentioned positive electrode active materials can be one of the above materials or composed of two or more of the above materials.

[0067] The positive electrode active material layer 41 may include a binder, conductive additives, etc. For example, the binder content of the positive electrode active material layer 41 is preferably 0.5% to 5% by mass, and more preferably 2.56% by mass. The thickness of the positive electrode active material layer 41 (length in the stacking direction of each layer) is preferably, for example, 80 μm to 100 μm. As a result, the battery capacity of the all-solid-state battery 1 can be improved.

[0068] The positive current collector layer 42 is not particularly limited, and can be made of materials such as aluminum, stainless steel, or conductive carbon (e.g., graphite, carbon nanotubes). The shape of the positive current collector layer 42 can be, for example, foil, plate, mesh, non-woven fabric, or foam. In this embodiment, the positive current collector layer 42 is composed of a positive current collector foil 42a.

[0069] (Intermediate layer)

[0070] An intermediate layer 5 is disposed between the negative electrode layer 2 and the solid electrolyte layer 3. For example, in the case where the all-solid-state battery 1 is a lithium metal battery, the intermediate layer 5 has the function of uniformly depositing lithium metal. Therefore, the interface between the intermediate layer 5 and the solid electrolyte layer 3 is stabilized. In the case where the all-solid-state battery 1 is a lithium metal secondary battery with an intermediate layer 5, the all-solid-state battery 1 can also be an anode-free battery where the negative electrode active material layer 21 is absent during the initial charge. In this case, after the initial charge and discharge, a lithium metal layer serving as the negative electrode active material layer 21 is formed.

[0071] The material constituting the intermediate layer 5 is not particularly limited, and examples include metals capable of forming alloys with lithium and amorphous carbon. Examples of metals capable of forming alloys with lithium include tin (Sn), silicon (Si), zinc (Zn), magnesium (Mg), gold (Au), platinum (Pt), palladium (Pd), silver (Ag), aluminum (Al), bismuth (Bi), and antimony (Sb). Metals capable of forming alloys with lithium can be nanoparticles. Examples of amorphous carbon include carbon blacks such as acetylene black, furnace black, and Ketjen black; coke; and activated carbon. Amorphous carbon can be easily graphitized carbon (soft carbon), or difficult-to-graphitize carbon (hard carbon), CNTs (carbon nanotubes), fullerenes, and graphene. In addition to the above materials, the intermediate layer may also contain a binder.

[0072] [Suppression device]

[0073] Next, the structure of the pressing apparatus 100 for manufacturing the all-solid-state battery 1 configured as described above will be explained. Figure 2 This illustrates an example of the pressing device 100 in the embodiment. The pressing device 100 includes an extension roller 110, a first positive electrode side transfer roller 120, and a peeling roller 130 (see reference). Figure 3 ), second positive electrode side transfer roller 140, intermediate layer transfer roller 150 (refer to) Figure 5 ), negative electrode side transfer roller 160 (refer to) Figure 5 ), negative electrode side sheet-like component stacked roller 170, upper and lower movable guide roller 180 (refer to) Figure 3 The positive electrode pressure roller 190 and the integrated pressure roller 200 are the main components. The pressing device 100 continuously manufactures the all-solid-state battery 1 while using these rollers to feed the positive electrode-side sheet-like component 300 in one direction. Furthermore, Figure 1 The diagram shows the range of pressing or transfer pressing performed in the positive electrode pressing step S5, the second solid electrolyte layer transfer step S6, the intermediate layer transfer step S7, the negative electrode side solid electrolyte layer transfer step S8, and the integrated pressing step S10, which are described later.

[0074] The positive electrode-side sheet member 300 is a sheet-like member obtained by laminating a positive electrode active material layer 41 on a positive electrode current collector foil 42a constituting a positive electrode current collector layer 42. The positive electrode-side sheet member 300 is fed out by a roller (not shown) and is transported in a manner that extends continuously from the base end side to the terminal end in the production line of the all-solid-state battery 1.

[0075] The extension roller 110, the first positive electrode side transfer roller 120, the peeling roller 130, the second positive electrode side transfer roller 140, the intermediate layer transfer roller 150, the negative electrode side transfer roller 160, and the negative electrode side sheet component stacking roller 170 are each composed of a pair of rotating bodies.

[0076] These rotating bodies are arranged in the transport direction (hereinafter referred to as the "transport direction"), starting from the upstream side, in the following order: extension roller 110, first positive electrode transfer roller 120, peeling roller 130, vertically movable guide roller 180, positive electrode pressure roller 190, second positive electrode transfer roller 140, negative electrode sheet member stacking roller 170, and integrated pressure roller 200. Therefore, the pressing and other processing in these rotating bodies are carried out on the same transport line (hereinafter referred to as the "transport line") that is the transport direction of the positive electrode sheet member 300.

[0077] The intermediate layer transfer roller 150 and the negative electrode side transfer roller 160 are configured such that the positive electrode side sheet member 300 is separated from the transport line, and the intermediate layer 5 or the negative electrode side solid electrolyte layer SE3 is transferred and pressed. Then, as described later, the intermediate layer 5 and the negative electrode layer 2 with the negative electrode side solid electrolyte layer SE3 transferred are transported to the upper or lower surface side of the positive electrode side sheet member 300, and merged with the transport line of the positive electrode side sheet member 300, and are stacked using the negative electrode side sheet member stacking roller 170.

[0078] The first positive electrode side transfer roller 120, the second positive electrode side transfer roller 140, the intermediate layer transfer roller 150, and the negative electrode side transfer roller 160 sandwich a sheet such as a substrate on the side to be transferred and a sheet with a solid electrolyte layer or the like provided on it between a pair of rollers, and pass it through while applying pressure, thereby performing transfer pressing.

[0079] Specifically, the first positive electrode side transfer roller 120 transfers the first solid electrolyte layer SE1 to the positive electrode side sheet member 300 by clamping the sheet, i.e., the transfer sheet 121, on which the first solid electrolyte layer SE1 is provided, between a pair of rollers and applying pressure.

[0080] Furthermore, in this embodiment, as described above, an extension roller 110 is disposed upstream of the first positive electrode side transfer roller 120. The extension roller 110 is configured to apply tension to the transfer sheet 121 in a width direction (hereinafter referred to as "width direction") orthogonal to the transport direction of the positive electrode side sheet member 300 before the first solid electrolyte layer SE1 is transferred to the positive electrode side sheet member 300 by the first positive electrode side transfer roller 120, and to make the transfer sheet 121 parallel to the positive electrode side sheet member 300, thereby adjusting the penetration angle of the transfer sheet 121 relative to the positive electrode side sheet member 300.

[0081] Here, the reason for providing the extension roller 110 in the embodiment will be explained. For example, as is known in the past, when the first solid electrolyte layer SE1 is transferred to the positive electrode side sheet member 300 by the first positive electrode side transfer roller 120 without the extension roller 110, the transfer may not be performed properly. In particular, since no tension is applied in the width direction, the transfer accuracy of the first solid electrolyte layer SE1 may be reduced. In addition, if the transfer accuracy is reduced, the bonding accuracy between the first solid electrolyte layer SE1 and the positive electrode layer 4 (positive electrode active material layer 41) may also be reduced. Therefore, in the embodiment, the extension roller 110 is provided to improve the transfer accuracy of the first solid electrolyte layer SE1.

[0082] Figure 3 It is a more detailed expression Figure 2 An enlarged view of the portion enclosed by the dotted line. The extending roller 110 applies tension to the transfer sheet 121 wound from the transfer sheet roll 122 containing the transfer sheet 121 not only in the transport direction but also in the width direction. Furthermore, Figure 3 The arrows shown for each roller and each roll indicate the rotation direction of each roller and each roll.

[0083] Specifically, such as Figure 4 As shown, the expanding roller 110 is a roll extending in the width direction, with its diameter at the center being larger than that at both ends. In other words, the expanding roller 110 has a so-called crown-shaped shape in which the outer diameter gradually decreases from the center towards the ends. The cross-section of the crown-shaped shape can be a tapered shape that is straight from the center towards the ends, or it can be a curved shape that bends from the center towards the ends. In addition, although not shown, the expanding roller 110 can be a structure in which the straight roller is convex relative to the transfer sheet 121 at the center, or it can be a structure in which the outer diameter gradually decreases from the end side towards the center side.

[0084] By shaping the transfer sheet 121 in this way, tension is applied in the width direction by pulling it towards both ends. Furthermore, regarding the tension in the transport direction, even without the extension roller 110, it can be assumed that a certain degree of tension is applied; however, by providing the extension roller 110, it can be assumed that the tension in the transport direction is also increased.

[0085] In addition, such as Figure 3 and Figure 4 As shown, the transfer sheet 121 has a first solid electrolyte layer SE1 and a substrate sheet 123 on which the first solid electrolyte layer SE1 is disposed. The substrate sheet 123 is peeled off from the transferred first solid electrolyte layer SE1 by a peeling roller 130, described later. It is made of, for example, PET (polyethylene terephthalate), stainless steel, aluminum, etc. Figure 3In the diagram, the first solid electrolyte layer SE1 in the transfer sheet 121 rolled out from the transfer sheet roll 122 is represented by a solid line, and the substrate sheet 123 that has been peeled off is represented by a dashed line.

[0086] Furthermore, in this embodiment, a positioning portion 111 for positioning the transfer sheet 121 is formed on the extension roller 110. Figure 4 In the example shown, as a positioning part 111, a guide groove 111a for guiding the transfer sheet 121 is shown. This guide groove 111a guides the transfer sheet 121, thereby restricting the movement of the transfer sheet 121 in the width direction. Furthermore, the structure of the positioning part 111 can be other structures, as long as it can position the transfer sheet 121 in the width direction. For example, instead of the guide groove 111a, a pair of barrier walls may be formed in the width direction.

[0087] The transfer sheet 121, transported by the extension roller 110, is then transferred to the positive electrode side sheet member 300 by the first positive electrode side transfer roller 120. For precise transfer, it is preferable that the transfer sheet 121 is parallel to the positive electrode side sheet member 300 during transfer pressing by the first positive electrode side transfer roller 120. In this embodiment, as described above, since a positioning portion 111 for positioning the transfer sheet 121 is formed in the extension roller 110, tension is applied to the transfer sheet 121 in the width direction (and transport direction), thus enabling the transfer sheet 121 to achieve the desired parallel state with the positive electrode side sheet member 300.

[0088] Thus, in addition to applying tension to the transfer sheet 121 in the width direction, the extension roller 110 also functions to make the transfer sheet 121 parallel to the positive electrode side sheet member 300. In other words, it can be said that the extension roller 110 also functions to adjust the angle of penetration of the transfer sheet 121 relative to the positive electrode side sheet member 300 in order to establish a parallel state between the two.

[0089] A peeling roller 130 is disposed downstream of the first positive electrode side transfer roller 120. The peeling roller 130 peels the substrate sheet 123 from the transfer sheet 121 on which the first solid electrolyte layer SE1 is disposed. Specifically, as Figure 3 As shown, the substrate sheet 123 is peeled off from the first solid electrolyte layer SE1, which has been transferred and pressed. At this time, the peeling roller 130 also functions as a suppressor when peeling the substrate sheet 123 off from the first solid electrolyte layer SE1. Then, the peeled substrate sheet 123 is wound up by the substrate roll 131 that winds up the substrate sheet 123.

[0090] Thus, the transfer sheet 121, rolled out from the transfer sheet roll 122, is subjected to tension primarily in the width direction by the spreading roller 110, and in this state, the first solid electrolyte layer SE1 is transferred to the positive electrode side sheet member 300 by the first positive electrode side transfer roller 120. Then, the substrate sheet 123 is wound from the transferred first solid electrolyte layer SE1 by the substrate roll 131 via the peeling roller 130.

[0091] It should be noted that, as Figure 3 As shown, the transfer sheet 121 is symmetrically disposed on both sides of the positive electrode-side sheet member 300, sandwiching it vertically, thereby transferring the first solid electrolyte layer SE1 onto both sides of the positive electrode-side sheet member 300. Therefore, the first solid electrolyte layer SE1 can be transferred onto both surfaces of the positive electrode-side sheet member 300 simultaneously.

[0092] On the other hand, if the first solid electrolyte layer SE1 is transferred to the positive electrode sheet member 300 using the first positive electrode side transfer roller 120, and the substrate sheet 123 is wound up from the transferred first solid electrolyte layer SE1 using the peeling roller 130, deformation may sometimes occur in the positive electrode sheet member 300 due to the relationship between the pressure during the transfer of the first solid electrolyte layer SE1 and the shear force during the peeling of the substrate sheet 123 from the first solid electrolyte layer SE1. In this deformed state, if the first solid electrolyte layer SE1 and the positive electrode sheet member 300 are densified and made more dense using the positive electrode pressure roller 190 (described later), the transfer accuracy between the positive electrode sheet member 300 and the first solid electrolyte layer SE1 may decrease. Therefore, in this embodiment, a vertically movable guide roller 180 is provided to suppress such deformation of the positive electrode sheet member 300 after transfer by the first positive electrode side transfer roller 120 and after peeling by the peeling roller 130.

[0093] The vertically movable guide roller 180 corrects deformation occurring in the positive electrode-side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred. That is, by temporarily releasing or reducing the pressure applied by the first positive electrode-side transfer roller 120, the tension applied to the positive electrode-side sheet member 300 is made uniform. In other words, the vertically movable guide roller 180 controls the tension applied by the transfer of the first positive electrode-side transfer roller 120 and the peeling action of the peeling roller 130.

[0094] In this embodiment, multiple movable guide rollers 180 are provided. Figure 3In the example shown, a positive electrode-side plate-shaped member 300 is sandwiched between six vertically movable guide rollers 180 on both sides. These vertically movable guide rollers 180 are defined, from the upstream side, as a first vertically movable guide roller 180a, a second vertically movable guide roller 180b, a third vertically movable guide roller 180c, a fourth vertically movable guide roller 180d, a fifth vertically movable guide roller 180e, and a sixth vertically movable guide roller 180f. Figure 3 In this example, the first vertically movable guide roller 180a, the third vertically movable guide roller 180c, the fourth vertically movable guide roller 180d, and the sixth vertically movable guide roller 180f are arranged on the lower surface of the positive electrode side sheet member 300, while the second vertically movable guide roller 180b and the fourth vertically movable guide roller 180d are arranged on the upper surface of the positive electrode side sheet member 300. This arrangement can be appropriately modified depending on the deformation of the positive electrode side sheet member 300. For example, the same number of vertically movable guide rollers 180 can be arranged on both the upper and lower surfaces of the positive electrode side sheet member 300. Alternatively, for example, the vertically movable guide rollers 180 can be arranged opposite each other, with the positive electrode side sheet member 300 sandwiched in the middle, similar to the structure of the first positive electrode side transfer roller 120, etc.

[0095] Furthermore, on the transport line, a pair of rollers disposed between the third vertically movable guide roller 180c and the fourth vertically movable guide roller 180d are, like the vertically movable guide roller 180, adjustment rollers 320 used to adjust the deformation of the positive electrode side sheet member 300 on which the first solid electrolyte layer SE1 is transferred.

[0096] Thus, in this embodiment, by using the movable guide roller 180 to control and adjust the tension of the deformed positive electrode side sheet member 300, the deformation of the positive electrode side sheet member 300 can be corrected, the accuracy of subsequent pressing using the positive electrode pressure roller 190 can be improved, and the transfer accuracy between the first solid electrolyte layer SE1 and the positive electrode side sheet member 300 can be improved.

[0097] like Figure 2 As shown, the second positive electrode side transfer roller 140 transfers the second solid electrolyte layer SE2 onto the positive electrode side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred and pressed.

[0098] like Figure 5 As shown, the intermediate layer transfer roller 150 transfers the intermediate layer 5 onto the negative electrode active material layer 21 stacked on the negative electrode current collector foil 22a. Thus, the intermediate layer 5 is disposed between the negative electrode active material layer 21 and the negative electrode side solid electrolyte layer SE3.

[0099] like Figure 5As shown, the negative electrode side transfer roller 160 transfers the negative electrode side solid electrolyte layer SE3 onto the intermediate layer 5 to form the negative electrode side sheet member 310.

[0100] like Figure 2 As shown, the negative electrode side sheet member stacking roller 170 transports and stacks the negative electrode side sheet member 310, which has a negative electrode side solid electrolyte layer SE3, onto the positive electrode side sheet member 300, which has a first solid electrolyte layer SE1 and a second solid electrolyte layer SE2 transferred thereon.

[0101] The positive electrode pressure roller 190 and the integrated pressure roller 200, like each transfer roller, are each composed of a pair of rotating rollers. Depending on the process, the positive electrode side sheet-like member 300, which is laminated with a solid electrolyte layer, is sandwiched between the pair of rollers and pressure is applied while it passes through, thus achieving densification and high density. For example, as... Figure 3 As shown, the outer diameter of the positive electrode pressure roller 190 is larger than that of the first positive electrode side transfer roller 120 described above, and the pressure applied during pressing is also greater. In this embodiment, the positive electrode pressure roller 190 presses the positive electrode side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred. Furthermore, a hard chrome plating layer is applied to the surface of the positive electrode pressure roller 190, for example.

[0102] The integrated pressure roller 200 presses the electrode 10 in a manner that integrates the positive electrode-side sheet member 300 and the negative electrode-side sheet member 310 in a stacked state. As a result, while the positive electrode-side sheet member 300 and the negative electrode-side sheet member 310 are integrated, the first solid electrolyte layer SE1, the second solid electrolyte layer SE2, and the negative electrode-side solid electrolyte layer SE3 are increased in density.

[0103] [Manufacturing methods for all-solid-state batteries]

[0104] Next, a method for manufacturing an all-solid-state battery using a pressing device 100 configured as described above will be explained. Figure 6 This is a flowchart illustrating an example of a method for manufacturing an all-solid-state battery. As a process, the method for manufacturing an all-solid-state battery includes a positive electrode-side sheet member conveying step S1, a first solid electrolyte layer transfer step S2, a peeling step S3, a tension control step S4, a positive electrode pressing step S5, a second solid electrolyte layer transfer step S6, an intermediate layer transfer step S7, a negative electrode-side solid electrolyte layer transfer step S8, a negative electrode-side sheet member stacking step S9, and an integrated pressing step S10. Furthermore, the first solid electrolyte layer transfer step S2 includes a tension application step S20 and a transfer step S21.

[0105] The positive electrode side sheet component conveying step S1 is a step of conveying and sending out the positive electrode side sheet component 300 using a conveying roller (not shown). That is, a positive electrode active material is coated on the positive electrode current collector foil 42a constituting the positive electrode current collector layer 42 and the stacked positive electrode side sheet component 300 is sent out.

[0106] The first solid electrolyte layer transfer step S2 is the step of transferring the first solid electrolyte layer SE1 to the positive electrode side sheet member 300 using the first positive electrode side transfer roller 120. Specifically, the first solid electrolyte layer transfer step S2 performs the tension application step S20 and the transfer step S21.

[0107] The tension application step S20 is a step in which the transfer sheet 121, wound from the transfer sheet roll 122, is subjected to tension in the width direction by the aforementioned extending roller 110. That is, since the diameter of the central portion of the extending roller 110 is larger than the diameters of both ends, tension is applied to the transfer sheet 121 in the width direction by stretching it towards both ends of the extending roller 110. In addition, as described above, the transfer sheet 121 is positioned in the width direction by the guide groove 111a formed in the extending roller 110, thereby applying tension in the width direction, and the transfer sheet 121 is parallel to the positive electrode side sheet member 300, so that the transfer step S21 described later can be performed while maintaining this parallel state.

[0108] The transfer step S21 is the step of transferring the first solid electrolyte layer SE1 in the tensioned transfer sheet 121 to the positive electrode side sheet member 300. Specifically, the first solid electrolyte layer SE1 is pressed through the positive electrode side sheet member 300 while being pressed by a pair of first positive electrode side transfer rollers 120, thus performing transfer pressing. The pressure at this time is set to 50 MPa to 500 MPa at a specified temperature (e.g., 10°C to 150°C). Preferably, it is 100 MPa at 25°C.

[0109] The peeling step S3 is the step of peeling the substrate sheet 123 from the first solid electrolyte layer SE1 after the transfer step S21. Specifically, the substrate sheet 123 is peeled from the first solid electrolyte layer SE1 after transfer pressing using the peeling roller 130 through the transfer step S21. Then, the peeled substrate sheet 123 is wound up using the substrate roll 131.

[0110] Tension control step S4 is a step of controlling the tension applied to the positive electrode-side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred, through the transfer step S21 and the peeling step S3 described above. That is, by using the movable guide roller 180 described above, the pressure applied to the positive electrode-side sheet member 300 in the transfer step S21 is released or reduced, thereby achieving uniformity of the tension applied to the positive electrode-side sheet member 300. As a result, the deformation of the positive electrode-side sheet member 300 caused by the transfer step S21 and the peeling step S3 can be corrected. Moreover, by performing such processing before the positive electrode pressing step S5 described later, the deformation of the positive electrode-side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred can be adjusted before densification and high-density processing of the positive electrode-side sheet member 300, thus avoiding densification and high-density processing in a deformed state.

[0111] The positive electrode pressing step S5 is a step of densifying and increasing the density of the positive electrode side sheet member 300 with the first solid electrolyte layer SE1 by pressing it with a positive electrode pressure roller 190 on the same transport line as the transfer step S21 described above. The pressure applied in this positive electrode pressing step S5 is greater than the pressure applied in the transfer step S21. By pressing with a pressure greater than that in the transfer step S21, the positive electrode is densified and increased in density. The pressing pressure used to increase its density is, for example, about 300 MPa to 1200 MPa at a temperature of 25°C to 100°C. The laminate of the increased-density positive electrode side sheet member 300 and the first solid electrolyte layer SE1 is transported downstream on the transport line.

[0112] In this way, by performing the transfer step S21 and the positive electrode pressing step S5 on the same transport line, compared with the case where, for example, the transfer step S21 and the positive electrode pressing step S5 are performed on different production lines, the transfer accuracy can be improved, and densification and high density can be appropriately achieved.

[0113] The second solid electrolyte layer transfer step S6 is a step after the positive electrode pressing step S5, in which the second solid electrolyte layer SE2 is transferred onto the positive electrode side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred and pressed, using the second positive electrode side transfer roller 140. Specifically, in the second solid electrolyte layer transfer step S6, the second solid electrolyte layer SE2 is aligned onto the positive electrode side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred, arranged within a range guided by a guide roller (not shown). Then, the second solid electrolyte layer SE2 is pressed through the positive electrode side sheet member 300 while being pressed by the second positive electrode side transfer roller 140, which acts as a transfer roller, to perform transfer pressing. The pressure at this time is, for example, set to 50 MPa to 500 MPa at a specified temperature (e.g., 10°C to 150°C). In this way, the positive electrode side sheet member 300 is pressed more than twice. Preferably, it is 150 MPa at 25°C.

[0114] On the other hand, a negative electrode side plate-shaped component 310 is prepared at a location separated from the transport line. First, as... Figure 5 As shown on the upper side, the intermediate layer 5 is transferred onto the negative electrode active material layer 21 stacked on the negative electrode current collector foil 22a by the intermediate layer transfer roller 150 (intermediate layer transfer step S7). Then, as... Figure 5 As shown on the lower side, the negative electrode-side solid electrolyte layer SE3 is transferred onto the intermediate layer 5 by the negative electrode-side transfer roller 160 to form the negative electrode-side sheet member 310 (negative electrode-side solid electrolyte layer transfer step S8). Thus, the intermediate layer 5 is disposed between the negative electrode active material layer 21 and the negative electrode-side solid electrolyte layer SE3. Furthermore, in this embodiment, the negative electrode-side sheet member 310 includes a member having a negative electrode current collector foil 22a, a negative electrode active material layer 21, an intermediate layer 5, and a negative electrode-side solid electrolyte layer SE3 stacked together, but it may also omit the negative electrode active material layer 21 or the intermediate layer 5.

[0115] In the intermediate layer transfer step S7, the intermediate layer 5 is aligned on the negative electrode active material layer 21 in a manner that allows it to be guided within a range not shown by a guide roller. Then, the intermediate layer 5 is passed through the negative electrode active material layer 21 while being pressed using an intermediate layer transfer roller 150, which serves as a transfer roller, to perform an intermediate layer transfer pressing process, transferring the intermediate layer 5 to the negative electrode active material layer 21. The pressure at this time is, for example, set to 50 MPa to 800 MPa at a specified temperature (e.g., 10°C to 150°C). More preferably, it is in the range of 300 MPa or more and 800 MPa or less at 25°C.

[0116] In the negative electrode side solid electrolyte layer transfer step S8, the negative electrode side solid electrolyte layer SE3 is aligned on the intermediate layer 5 in a manner that allows it to be positioned within a range guided by a guide roller (not shown). Then, the negative electrode side solid electrolyte layer SE3 is passed through the intermediate layer 5 under pressure by a negative electrode side transfer roller 160, which acts as a transfer roller, to transfer the negative electrode side solid electrolyte layer SE3 to the negative electrode active material layer of the intermediate layer 5. The pressure at this time is, for example, set to 600 MPa to 800 MPa at a specified temperature (e.g., 10°C to 150°C).

[0117] Furthermore, regarding pressure, the pressing pressure in the positive electrode pressing step S5 is not only the maximum value of the pressing pressure applied to the positive electrode side plate member 300, but also the maximum value of the pressing pressure in the entire pressing device method. To increase energy density and densify the electrode 10, the positive electrode side plate member 300 is pressed under high pressure. The maximum value of the pressing pressure in the positive electrode pressing step S5 is greater than or equal to the maximum value of the pressing pressure applied to the negative electrode side plate member 310.

[0118] Furthermore, the pressure during the transfer of the first solid electrolyte layer in step S2 and the second solid electrolyte layer in step S6 is lower than the pressure during the pressing of the positive electrode in step S5. Additionally, the pressure during the transfer of the first solid electrolyte layer in step S2 and the second solid electrolyte layer in step S6 is lower than the pressure during the pressing of the negative electrode solid electrolyte layer in step S8.

[0119] Because the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 contain a relatively large amount of binder, the pressing pressure during transfer can be reduced. Furthermore, by setting the transfer pressing pressure as low as possible, the extension of the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 caused by the transfer pressing can be reduced. Therefore, room for the extension of the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 in subsequent integration pressing steps such as S10 can be preserved, allowing the first solid electrolyte layer SE1 to extend along with the positive electrode layer 4. This improves the adhesion between the first solid electrolyte layer SE1 and the positive electrode active material layer 41.

[0120] Furthermore, after the negative electrode-side solid electrolyte layer transfer step S8, the formed negative electrode-side sheet member 310 is cut by a cutter while supported by a release roller used to release the member transferred in the negative electrode-side solid electrolyte layer transfer step S8. The negative electrode-side sheet member 310 is cut to the design dimensions of the negative electrode layer 2 of the all-solid-state battery 1.

[0121] like Figure 2 and Figure 6As shown, the negative electrode-side sheet member 310, cut to the designed size, is transported to the positive electrode-side sheet member 300 to merge with the transport line of the positive electrode-side sheet member 300 and is stacked on the positive electrode-side sheet member 300. At this time, before the integration pressing step S10 described later, a first solid electrolyte layer SE1 is provided on the lower side of the positive electrode-side sheet member 300 opposite to the negative electrode-side solid electrolyte layer SE3, and a second solid electrolyte layer SE2 is provided thereon. Furthermore, the negative electrode-side sheet member 310 is disposed on the positive electrode-side sheet member 300 in a cut state.

[0122] Specifically, in the negative electrode side sheet member stacking step S9, a negative electrode side sheet member 310, on which a first solid electrolyte layer SE1 and a second solid electrolyte layer SE2 have been transferred, is transported and stacked on the positive electrode side sheet member 300 by the negative electrode side sheet member stacking roller 170. In the negative electrode side sheet member stacking step S9, the negative electrode side sheet member 310, cut to the designed size, is aligned onto the positive electrode side sheet member 300, on which the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 have been transferred, in a manner that allows it to be positioned within a range guided by a guide roller (not shown).

[0123] Thus, with the positive electrode-side sheet member 300 and the negative electrode-side sheet member 310 stacked, the electrode 10 is integrated using an integrated pressure roller 200 (integration pressing step S10). Before the integration pressing step S10, the thickness of the positive electrode-side sheet member 300 is greater than that of the negative electrode-side sheet member 310 in the stacking direction. The pressure at this time is, for example, approximately 500 MPa to 900 MPa at 25°C to 100°C. Through the integration pressing step S10, while the positive electrode-side sheet member 300 and the negative electrode-side sheet member 310 are integrated, the first solid electrolyte layer SE1, the second solid electrolyte layer SE2, and the negative electrode-side solid electrolyte layer SE3 are densified. Comparing the pressing pressure of the integration pressing step S10 and the positive electrode pressing step S5, the pressing pressure of the positive electrode pressing step S5 is greater than the pressing pressure of the integration pressing step S10.

[0124] After the integrated pressing step S10, the formed electrode 10 is cut off using a rotary cutter.

[0125] Furthermore, the processes described above—the transfer of the first solid electrolyte layer SE1 in the first solid electrolyte layer transfer step S2, the peeling of the substrate sheet 123 in the peeling step S3, the pressing of the positive electrode side sheet member 300 in the positive electrode pressing step S5, the transfer of the second solid electrolyte layer SE2 in the second solid electrolyte layer transfer step S6, the pre-integration stacking of the negative electrode side sheet member 310 in the negative electrode side sheet member stacking step S9, and the integration pressing in the integration pressing step S10—are performed on both sides of the positive electrode side sheet member 300 delivered through the positive electrode side sheet member transport step S1. Thus, an all-solid-state battery 1 is obtained in which each layer sandwiches the positive electrode side sheet member 300 and is symmetrically stacked on the upper and lower sides of the positive electrode side sheet member 300.

[0126] The embodiments have been described above with reference to the accompanying drawings, but the present invention is not limited to these embodiments. It is obvious that those skilled in the art will conceive of various modifications or alterations within the scope of the technical solutions described, and it should be understood that these modifications and alterations also fall within the technical scope of the present invention. Furthermore, the constituent elements of the above embodiments can be combined arbitrarily without departing from the spirit of the invention.

[0127] For example, in the above embodiment, various solid electrolyte layers are stacked on both sides of the positive electrode-side sheet member 300, but this stacking may also be a structure where the layers are stacked on only one side. Additionally, in the above embodiment, the transfer sheet 121 is disposed on both sides of the positive electrode-side sheet member 300, but it may also be a structure where the transfer sheet 121 is disposed on only one side.

[0128] At least the following items are described in this specification. Additionally, the corresponding components in the above embodiments are shown in parentheses, but this is not a limitation.

[0129] (1) A method for manufacturing an all-solid-state battery (all-solid-state battery 1), comprising pressing a solid electrolyte layer (first solid electrolyte layer SE1) onto a positive electrode side sheet member (positive electrode side sheet member 300), comprising:

[0130] The transfer step (transfer step S21) involves transferring the solid electrolyte layer to the positive electrode-side sheet member; and

[0131] In the positive electrode pressing step (positive electrode pressing step S5), on the same production line, the solid electrolyte layer transferred in the transfer step and the positive electrode side sheet member are densified.

[0132] According to (1), by performing the transfer step and the positive electrode pressing step on the same production line, the accuracy of the transfer and densification between the solid electrolyte layer and the positive electrode side sheet member can be improved compared to performing each step on different production lines, for example. That is, when each step is performed on different production lines, errors may occur when attaching the solid electrolyte layer to the positive electrode side sheet member, but by performing these steps on the same production line, the occurrence of such errors can be reduced, and the adhesion between the solid electrolyte layer and the positive electrode side sheet member and the accuracy of interface formation can be improved.

[0133] (2) The manufacturing method of the all-solid-state battery according to (1), wherein,

[0134] A peelable substrate (substrate sheet 123) is provided on the solid electrolyte layer.

[0135] The manufacturing method of the all-solid-state battery further includes a peeling step (peeling step S3) of peeling the substrate from the solid electrolyte layer.

[0136] The stripping step, which occurs after the transfer step and before the positive electrode pressing step, peels the substrate from the solid electrolyte layer.

[0137] According to (2), after the solid electrolyte layer is transferred to the positive electrode side sheet member, the substrate can be peeled off from the solid electrolyte layer.

[0138] (3) The manufacturing method of the all-solid-state battery according to (2), wherein,

[0139] The manufacturing method of the all-solid-state battery further includes a tension control step (tension control step S4), in which the tension applied in the positive electrode side sheet member on which the solid electrolyte layer is transferred is controlled by transfer based on the transfer step and peeling based on the peeling step.

[0140] The tension control step, which occurs after the peeling step and before the positive electrode pressing step, controls the tension applied to the positive electrode side sheet member on which the solid electrolyte layer is transferred.

[0141] According to (3), due to the transfer step and the peeling step, the positive electrode side sheet member with the solid electrolyte layer may be deformed, but the tension can be adjusted by controlling the tension through the tension control step, thereby making the tension applied to the positive electrode side sheet member uniform, and as a result, the deformation of the positive electrode side sheet member can be corrected.

[0142] (4) The manufacturing method of the all-solid-state battery according to (1) or (2), wherein,

[0143] The pressure applied in the positive electrode pressing step is greater than the pressure applied in the transfer step.

[0144] According to (4), in the positive electrode pressing step, by applying higher pressure, it is possible to achieve densification and high density of the solid electrolyte layer and the positive electrode side sheet component.

[0145] (5) The manufacturing method of the all-solid-state battery according to (4), wherein,

[0146] The pressure applied during the positive electrode pressing step is 300 MPa to 1200 MPa.

[0147] According to (5), the solid electrolyte layer and the positive electrode side sheet structure can be reliably pressed by pressing with high pressure.

[0148] (6) The method for manufacturing an all-solid-state battery according to (1) or (2), wherein,

[0149] In the positive electrode pressing step, a pair of positive electrode pressing rollers (positive electrode pressing rollers 190) with hard chromium plating are used to press the solid electrolyte layer and the positive electrode side sheet member that have been transferred in the transfer step.

[0150] According to (6), by implementing a hard chrome plating, the corrosion resistance and wear resistance of the positive electrode roller can be improved.

[0151] (7) The manufacturing method of the all-solid-state battery according to (6), wherein,

[0152] In the transfer step, a pair of transfer rollers (first positive electrode side transfer roller 120) are used to press the solid electrolyte layer onto the positive electrode side sheet member.

[0153] The outer diameter of the positive electrode pressure roller is larger than the outer diameter of the transfer roller.

[0154] According to (7), by using a roller diameter larger than that used for transfer pressing, it is possible to reliably achieve densification and high density of the solid electrolyte layer and the positive electrode side sheet components.

[0155] (8) The method for manufacturing an all-solid-state battery according to (1) or (2), wherein,

[0156] The solid electrolyte layer is sandwiched between the positive electrode-side sheet member and disposed on both sides of the positive electrode-side sheet member.

[0157] According to (8), a solid electrolyte layer can be transferred to both sides of the positive electrode sheet member.

[0158] (9) The method for manufacturing an all-solid-state battery according to (1) or (2), wherein,

[0159] The manufacturing method of the all-solid-state battery further includes:

[0160] In the positive electrode side sheet component conveying step (positive electrode side sheet component conveying step S1), the positive electrode side sheet component obtained by stacking a positive electrode active material layer (positive electrode active material layer 41) on the positive electrode current collector foil (positive electrode current collector foil 42a) is conveyed out.

[0161] The negative electrode side solid electrolyte layer transfer step (negative electrode side solid electrolyte layer transfer step S8) involves transferring the negative electrode side solid electrolyte layer (negative electrode side solid electrolyte layer SE3) to the negative electrode active material layer (negative electrode active material layer 21) stacked on the negative electrode current collector foil (negative electrode current collector foil 22a) to form a negative electrode side sheet member (negative electrode side sheet member 310).

[0162] The negative electrode side sheet-like component stacking step (negative electrode side sheet-like component stacking step S9) involves stacking the negative electrode side sheet-like component, on which the negative electrode side solid electrolyte layer has been transferred, onto the positive electrode side sheet-like component, on which the solid electrolyte layer has been transferred; and

[0163] The integrated pressing step (integrated pressing step S10) involves pressing the electrode (electrode 10) in a manner that integrates the positive electrode-side sheet member and the negative electrode-side sheet member while they are stacked.

[0164] The transfer step, the positive electrode pressing step, the negative electrode side sheet member stacking step, and the integrated pressing step are performed on the same production line relative to the positive electrode side sheet member.

[0165] According to (9), the transfer step, the positive electrode pressing step, the negative electrode side sheet member stacking step and the integrated pressing step are performed on the same production line relative to the positive electrode side sheet member. Therefore, compared with cases where each step is performed on different production lines, the adhesion between layers and the accuracy of interface formation can be improved.

Claims

1. A method for manufacturing an all-solid-state battery, comprising pressing a solid electrolyte layer onto a sheet-like component on the positive electrode side, the method comprising: In the transfer step, the solid electrolyte layer is transferred to the positive electrode side sheet member; as well as In the positive electrode pressing step, on the same production line, the solid electrolyte layer transferred in the transfer step is densified with the positive electrode side sheet member.

2. The method for manufacturing an all-solid-state battery according to claim 1, wherein, A peelable substrate is provided in the solid electrolyte layer. The manufacturing method of the all-solid-state battery further includes a peeling step of peeling the substrate from the solid electrolyte layer. The stripping step, which occurs after the transfer step and before the positive electrode pressing step, peels the substrate from the solid electrolyte layer.

3. The method for manufacturing an all-solid-state battery according to claim 2, wherein, The method for manufacturing the all-solid-state battery further includes a tension control step, in which the tension applied in the positive electrode-side sheet member on which the solid electrolyte layer is transferred is controlled by transfer based on the transfer step and peeling based on the peeling step. The tension control step, which occurs after the peeling step and before the positive electrode pressing step, controls the tension applied to the positive electrode side sheet member on which the solid electrolyte layer is transferred.

4. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein, The pressure applied in the positive electrode pressing step is greater than the pressure applied in the transfer step.

5. The method for manufacturing an all-solid-state battery according to claim 4, wherein, The pressure applied during the positive electrode pressing step is 300 MPa to 1200 MPa.

6. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein, In the positive electrode pressing step, a pair of positive electrode pressure rollers with hard chromium plating are used to press the solid electrolyte layer and the positive electrode side sheet member that have been transferred in the transfer step.

7. The method for manufacturing an all-solid-state battery according to claim 6, wherein, In the transfer step, a pair of transfer rollers are used to press the solid electrolyte layer onto the positive electrode side sheet member. The outer diameter of the positive electrode pressure roller is larger than the outer diameter of the transfer roller.

8. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein, The solid electrolyte layer is sandwiched between the positive electrode-side sheet member and disposed on both sides of the positive electrode-side sheet member.

9. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein, The manufacturing method of the all-solid-state battery further includes: The positive electrode side sheet component conveying step involves conveying the positive electrode side sheet component obtained by stacking a positive electrode active material layer on the positive electrode current collector foil; The negative electrode side solid electrolyte layer transfer step involves transferring the negative electrode side solid electrolyte layer to the negative electrode active material layer stacked on the negative electrode current collector foil to form a negative electrode side sheet-like component. The negative electrode side sheet-like component stacking step involves stacking the negative electrode side sheet-like component, on which the negative electrode side solid electrolyte layer has been transferred, onto the positive electrode side sheet-like component, on which the solid electrolyte layer has been transferred; and The integrated pressing step involves pressing the electrodes in a manner that integrates them while the positive electrode-side sheet member and the negative electrode-side sheet member are stacked. The transfer step, the positive electrode pressing step, the negative electrode side sheet member stacking step, and the integrated pressing step are performed on the same production line relative to the positive electrode side sheet member.

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