Manufacturing method for all-solid-state batteries

Abstract

This invention provides a method for manufacturing all-solid-state batteries that enables precise transfer of the solid electrolyte layer to the positive electrode layer. [Solution] A method for manufacturing an all-solid-state battery 1, comprising pressing a first solid electrolyte layer SE1 onto a positive electrode sheet member 300, the method comprising: a transfer step S21 for transferring the first solid electrolyte layer SE1 onto the positive electrode 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 sheet member 300 on the same line.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing an all-solid-state battery.

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development have been carried out on secondary batteries that contribute to energy efficiency.

[0003] Conventionally, as a method for manufacturing an all-solid-state battery, a method of manufacturing by pressing a positive electrode layer, a solid electrolyte layer, and a negative electrode layer with a roll is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the method for manufacturing a solid-state battery described in Patent Document 1, the solid electrolyte layer is transferred to the positive electrode layer by pressing a sheet provided with the solid electrolyte layer onto the positive electrode layer, but there is a risk that the accuracy of the transfer of the solid electrolyte layer will decrease.

[0006] 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. And by extension, it contributes to energy efficiency.

Means for Solving the Problems

[0007] One aspect of the present invention is A method for manufacturing an all-solid-state battery in which a solid electrolyte layer is pressed onto a positive electrode side sheet member, A transfer step of transferring the solid electrolyte layer to the positive electrode side sheet member, The system includes a positive electrode pressing step, which densifies the solid electrolyte layer transferred in the transfer step and the positive electrode side sheet member on the same line. [Effects of the Invention]

[0008] According to the present invention, it becomes possible to accurately transfer a solid electrolyte layer to a positive electrode layer. This, in turn, can contribute to improving energy efficiency. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a cross-sectional view showing an example of an all-solid-state battery 1. [Figure 2] Figure 2 shows an example of a press apparatus 100 for manufacturing an all-solid-state battery 1 in an embodiment. [Figure 3] Figure 3 is a diagram showing a part of the press apparatus 100, and in particular, it is a diagram illustrating an example of the transfer of the first solid electrolyte layer SE1. [Figure 4] Figure 4 is a schematic diagram showing an example of an expander roll 110. [Figure 5] Figure 5 shows a part of the press apparatus 100, and in particular, it shows an example of the transfer of the intermediate layer transfer roller 150 and the negative electrode side transfer roller 160. [Figure 6] Figure 6 is a flowchart showing an example of a manufacturing method for an all-solid-state battery 1. [Modes for carrying out the invention]

[0010] The following describes one embodiment with reference to the drawings. First, before describing the manufacturing method of the all-solid-state battery 1, the configuration of the all-solid-state battery 1 and the configuration of the press device 100 used in the manufacturing of the all-solid-state battery 1 will be described.

[0011] [All-solid battery] Figure 1 is a schematic diagram showing an example of an all-solid-state battery 1. The all-solid-state battery 1 has an electrode 10 in which a negative electrode layer 2, a solid electrolyte layer 3, and a positive electrode layer 4 are stacked. In this embodiment, as shown in Figure 1, a structure in which the negative electrode layer 2, solid electrolyte layer 3, positive electrode layer 4, solid electrolyte layer 3, and negative electrode layer 2 are stacked in that order will be described as the stacked structure of the all-solid-state battery 1. However, the structure of the all-solid-state battery 1 is not limited to the above. The all-solid-state battery 1 may have components other than the electrode 10 shown in Figure 1, such as an outer casing, which can be used in a solid battery.

[0012] The solid electrolyte layer 3 in the all-solid-state battery 1 comprises at least a first solid electrolyte layer SE1 located on the positive electrode layer 4 side and a negative electrode side solid electrolyte layer SE3 located on the negative electrode layer 2 side. The solid electrolyte layer 3 may also have a second solid electrolyte layer SE2 located adjacent to the first solid electrolyte layer SE1. In this embodiment, the solid electrolyte layer 3 is described as consisting of the above three layers. An intermediate layer 5 may optionally be arranged between the negative electrode layer 2 and the solid electrolyte layer 3.

[0013] The all-solid-state battery 1 is not particularly limited, but may be a lithium-ion solid-state secondary battery or a lithium metal secondary battery.

[0014] (Negative electrode layer) 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 a material that can be used as the negative electrode active material of the all-solid-state battery 1. Examples of negative electrode active materials constituting the negative electrode active material layer 21 include silicon-based active materials such as lithium metal, lithium alloy, Si, and Si alloy, and lithium titanate (Li4Ti5O 12 Examples include lithium transition metal oxides such as ), transition metal oxides such as TiO2, Nb2O3, and WO3, metal sulfides, metal nitrides, graphite, carbon materials such as soft carbon and hard carbon, and metallic indium.

[0015] The negative electrode active material layer 21 may contain materials other than those described above that can be contained in the negative electrode active material layer 21 of the all-solid-state battery 1. Examples of the above materials include a solid electrolyte, a conductive assistant, a binder, and the like. Examples of the solid electrolyte include the same ones as those contained in the solid electrolyte layer 3 described later. Examples of the conductive assistant include carbon black, natural graphite, carbon fiber, carbon nanotube, and the like. Examples of the binder include nitrile-based polymers, polyester-based polymers, acrylic acid-based polymers, cellulose-based polymers, styrene-based polymers, styrene-butadiene-based polymers, vinyl acetate-based polymers, urethane-based polymers, fluoroethylene-based polymers, and the like.

[0016] The negative electrode current collector layer 22 is not particularly limited, but can be made of copper, nickel, stainless steel, or the like. Examples of the shape of the negative electrode current collector layer 22 include a foil shape, a plate shape, a mesh shape, a non-woven fabric shape, a foamed shape, and the like. In the embodiment, the negative electrode current collector layer 22 is composed of a negative electrode current collector foil 22a.

[0017] (Solid electrolyte layer) The solid electrolyte layer 3 is formed between the negative electrode layer 2 and the positive electrode layer 4. In the embodiment, the solid electrolyte layer 3 has a structure in which a first solid electrolyte layer SE1 disposed in contact with the positive electrode layer, a second solid electrolyte layer SE2, and a negative electrode side solid electrolyte layer SE3 disposed on the negative electrode layer side are laminated in this order.

[0018] 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 that can be used as an electrolyte of a solid-state battery. For example, inorganic solid electrolytes such as sulfide solid electrolytes, oxide solid electrolytes, halide solid electrolytes, lithium-containing salts, and polymer-based solid electrolytes such as polyethylene oxide can be mentioned. The above solid electrolytes may be used alone or in combination of two or more.

[0019] Furthermore, the first solid electrolyte layer SE1 contains a binder in addition to the solid electrolyte material. The binder can be the same material as the binder that can be contained in the negative electrode active material layer 21. The binder content in the first solid electrolyte layer SE1 relative to the total mass of the first solid electrolyte layer SE1 is equal to or greater than the binder content 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. Preferably, the binder content in the first solid electrolyte layer SE1 is 10 to 30% by mass. This makes it easier for the first solid electrolyte layer SE1 to stretch in accordance with the positive electrode layer 4 when the positive electrode layer 4 is pressed.

[0020] In addition to the solid electrolyte material and binder, the first solid electrolyte layer SE1 may also contain materials that can be used in the solid electrolyte layer of a solid-state battery.

[0021] Furthermore, the thickness of the first solid electrolyte layer SE1 (length in the stacking direction of each layer) 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 to 15 μm.

[0022] The second solid electrolyte layer SE2 is an arbitrarily placed layer and is positioned 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 as the solid electrolyte material constituting the first solid electrolyte layer SE1. The second solid electrolyte layer SE2 may contain a binder or the like in addition to the solid electrolyte material, similar to the first solid electrolyte layer SE1. The binder content of the second solid electrolyte layer SE2 is less than or equal to the binder content of the first solid electrolyte layer SE1. The binder content of the second solid electrolyte layer SE2 is preferably, for example, 10 to 30 mass%. This can improve the energy density of the all-solid-state battery 1. The second solid electrolyte layer SE2 may contain a support. The support may be a three-dimensional structure such as a mesh, woven fabric, nonwoven fabric, embossed body, punched body, expanded, or foam. The second solid electrolyte layer SE2 does not need to contain the support.

[0023] The thickness of the second solid electrolyte layer SE2 (length in the stacking direction of each layer) 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, which will be described later. The thickness of the second solid electrolyte layer SE2 is preferably, for example, 10 to 50 μm.

[0024] The negative electrode solid electrolyte layer SE3 is located on the negative electrode layer side. The negative electrode solid electrolyte layer SE3 is located adjacent to the negative electrode layer 2. If the all-solid-state battery 1 has an intermediate layer 5 as shown in Figure 1, the negative electrode solid electrolyte layer SE3 may be located adjacent to the intermediate layer 5.

[0025] The solid electrolyte material constituting the negative electrode solid electrolyte layer SE3 is not particularly limited and can be the same as the solid electrolyte material constituting the first solid electrolyte layer SE1. The binder content of the negative electrode solid electrolyte layer SE3 is preferably, for example, 1.3 to 8.7 mass%. In terms of volume%, the binder content of the negative electrode solid electrolyte layer SE3 is preferably, for example, 2.7 volume% to 10 volume%. The binder content of the negative electrode solid electrolyte layer SE3 is less than the binder content of the first solid electrolyte layer SE1.

[0026] The thickness of the negative electrode solid electrolyte layer SE3 (length in the stacking direction of each layer) is preferably thinner than the thickness of the second solid electrolyte layer SE2. The thickness of the negative electrode solid electrolyte layer SE3 is preferably, for example, 3 to 8.5 μm.

[0027] (Positive electrode layer) The positive electrode layer 4 comprises 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 configuration in which two positive electrode active material layers 41 are laminated on both sides of one positive electrode current collector layer 42. However, the configuration of the positive electrode layer 4 is not limited to the above, and it may have a configuration in which one positive electrode active material layer 41 is laminated on one side of one positive electrode current collector layer 42.

[0028] 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 that make up the positive electrode active material layer 41 include LiCoO2, LiNiO2, and LiCo x Ni y Mn z Layered cathode active material particles such as O2(x+y+z=1), LiVO2, LiCrO2, LiMn2O4, Li(Ni 0.25 Mn 0.75 Examples of positive electrode active materials include spinel-type positive electrode active materials such as 2O4, LiCoMnO4, and Li2NiMn3O8; olivine-type positive electrode active materials such as LiCoPO4, LiMnPO4, and LiFePO4; conductive polymers such as solid solution oxides (Li2MnO3-LiMO2 (M=Co, Ni, etc.)), 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. The positive electrode active material may consist of one of the above materials or a composition of two or more of the above materials.

[0029] The positive electrode active material layer 41 may contain a binder, a conductive additive, etc. For example, the binder content of the positive electrode active material layer 41 is preferably 0.5 to 5% by mass. Preferably, it may be 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 to 100 μm. This can improve the battery capacity of the all-solid-state battery 1.

[0030] The positive electrode current collector layer 42 is not particularly limited, but can be made of, for example, aluminum, stainless steel, conductive carbon (e.g., graphite, carbon nanotubes, etc.). The shape of the positive electrode current collector layer 42 can be, for example, foil, plate, mesh, nonwoven fabric, or foam. In this embodiment, the positive electrode current collector layer 42 is made of a positive electrode current collector foil 42a.

[0031] (Middle class) The intermediate layer 5 is positioned between the negative electrode layer 2 and the solid electrolyte layer 3. The intermediate layer 5 has the function of uniformly depositing lithium metal, for example, when the all-solid-state battery 1 is a lithium metal battery. Therefore, the interface between the intermediate layer 5 and the solid electrolyte layer 3 is stabilized. When the all-solid-state battery 1 is a lithium metal secondary battery having the intermediate layer 5, the all-solid-state battery 1 may be an anode-free battery in which the negative electrode active material layer 21 does not exist at the time of the first charge. In this case, the lithium metal layer as the negative electrode active material layer 21 is formed after the first charge and discharge.

[0032] The materials constituting the intermediate layer 5 are not particularly limited, but examples include metals that can be alloyed with lithium, and amorphous carbon. Examples of metals that can be alloyed 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). The metals that can be alloyed with lithium may also be nanoparticles. Examples of amorphous carbon include carbon blacks such as acetylene black, furnace black, and Ketjen black, as well as coke and activated carbon. The amorphous carbon may be easily graphitizable carbon (soft carbon), difficult-to-graphitize carbon (hard carbon), CNTs (carbon nanotubes), fullerenes, and graphene. The intermediate layer may also contain a binder in addition to the above materials.

[0033] [Pressing device] Next, the configuration of the press apparatus 100 for manufacturing the all-solid-state battery 1 configured as described above will be explained. Figure 2 shows an example of the press apparatus 100 in the embodiment. The press apparatus 100 has as its main components an expander roll 110, a first positive electrode side transfer roller 120, a peeling roller 130 (see Figure 3), a second positive electrode side transfer roller 140, an intermediate layer transfer roller 150 (see Figure 5), a negative electrode side transfer roller 160 (see Figure 5), a negative electrode side sheet member lamination roller 170, an up-and-down movable guide roll 180 (see Figure 3), a positive electrode press roll 190, and an integrated press roll 200. The press apparatus 100 continuously manufactures the all-solid-state battery 1 by feeding the positive electrode side sheet member 300 in one direction using each of these rollers and rolls. Figure 1 shows the areas that are pressed or transferred during 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 integration pressing step S10, which will be described later.

[0034] 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 that constitutes the positive electrode current collector layer 42. The positive electrode side sheet member 300 is fed out by a roller (not shown) and transported so as to extend continuously from the base end to the end in the manufacturing line of the all-solid-state battery 1.

[0035] The expander roll 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 member lamination roller 170 are each composed of a pair of rotating bodies.

[0036] These rotating bodies are arranged in the following order from upstream to downstream along the transport direction (hereinafter simply referred to as the "transport direction"), which is the direction in which the positive electrode side sheet member 300 is transported: expander roll 110, first positive electrode side transfer roller 120, peeling roller 130, vertically movable guide roll 180, positive electrode press roll 190, second positive electrode side transfer roller 140, negative electrode side sheet member lamination roller 170, and integrated press roll 200. Therefore, pressing and other processes on these rotating bodies are performed on the same transport line (hereinafter referred to as the "transport line"), which is the transport direction of the positive electrode side sheet member 300.

[0037] The intermediate layer transfer roller 150 and the negative electrode side transfer roller 160 are positioned away from the conveyor line when the positive electrode side sheet member 300 is placed, and the intermediate layer 5 or the negative electrode side solid electrolyte layer SE3 is transferred and pressed. Subsequently, as will be described later, the intermediate layer 5 and the negative electrode layer 2, to which the negative electrode side solid electrolyte layer SE3 has been transferred, are conveyed to the upper or lower side of the positive electrode side sheet member 300, join the conveyor line of the positive electrode side sheet member 300, and are laminated by the negative electrode side sheet member lamination roller 170.

[0038] 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 perform a transfer press by passing a sheet of the substrate to be transferred and a sheet on which the solid electrolyte layer to be transferred is provided between a pair of rollers while applying pressure.

[0039] 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 sandwiching the transfer sheet 121, which is a sheet on which the first solid electrolyte layer SE1 is provided, between a pair of rollers and applying pressure.

[0040] Furthermore, in this embodiment, as described above, an expander roll 110 is positioned upstream of the first positive electrode side transfer roller 120. The expander roll 110 is configured to apply tension to the transfer sheet 121 in the width direction (hereinafter simply referred to as "width direction") perpendicular 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 adjust the angle at which the transfer sheet 121 penetrates the positive electrode side sheet member 300 by making the transfer sheet 121 parallel to the positive electrode side sheet member 300.

[0041] Here, we will explain why the expander roll 110 is provided in this embodiment. For example, as is conventionally known, when the first solid electrolyte layer SE1 is transferred to the positive electrode sheet member 300 by the first positive electrode side transfer roller 120 without the expander roll 110, the transfer may not be performed properly. In particular, because no tension is applied in the width direction, the accuracy of the transfer of the first solid electrolyte layer SE1 may decrease. Furthermore, if the accuracy of the transfer decreases in this way, the accuracy of the bonding between the first solid electrolyte layer SE1 and the positive electrode layer 4 (positive electrode active material layer 41) may also decrease. Therefore, in this embodiment, the expander roll 110 is provided to improve the accuracy of the transfer of the first solid electrolyte layer SE1.

[0042] Figure 3 shows a more detailed enlarged view of the area enclosed by the dashed line in Figure 2. The expander roll 110 applies tension in the width direction in addition to the transport direction to the transfer sheet 121 as it is unwound from the transfer sheet roll body 122 around which the transfer sheet 121 is wound. The arrows shown for each roller and roll body in Figure 3 indicate the rotation direction of each roller and roll body.

[0043] Specifically, as shown in Figure 4, the expander roll 110 is a roll body that extends in the width direction, with a larger diameter at the central end than at both ends. In other words, the expander roll 110 has a so-called crown shape, where the outer diameter gradually decreases from the central end to the end end. The crown shape may be a tapered shape where the cross-section is straight from the central end to the end end, or a curved shape where it is curved from the central end to the end end. Although not shown, the expander roll 110 may also be configured to bend a straight roll so that it is convex at the central end relative to the transfer sheet 121, or the outer diameter may gradually decrease from the end end to the central end.

[0044] Due to this shape, the transfer sheet 121 is pulled towards both ends, that is, tension is applied in the width direction. Regarding tension in the transport direction, it can be assumed that some tension is applied even if the expander roll 110 is not provided, but it is expected that the tension in the transport direction will increase with the provision of the expander roll 110.

[0045] As shown in Figures 3 and 4, the transfer sheet 121 comprises a first solid electrolyte layer SE1 and a base sheet 123 on which the first solid electrolyte layer SE1 is provided. The base sheet 123 is peeled off from the transferred first solid electrolyte layer SE1 by a peeling roller 130, which will be described later, and is made of, for example, PET (polyethylene terephthalate), stainless steel, aluminum, etc. In Figure 3, the first solid electrolyte layer SE1 of the transfer sheet 121 unwound from the transfer sheet roll 122 is shown by a solid line, and the base sheet 123 that is peeled off is shown by a dashed line.

[0046] Furthermore, the expander roll 110 in this embodiment has a positioning section 111 for positioning the transfer sheet 121. In the example shown in Figure 4, an example of the positioning section 111 is shown in which a guide groove 111a is formed to guide the transfer sheet 121. By guiding the transfer sheet 121 with this guide groove 111a, the movement of the transfer sheet 121 in the width direction can be restricted. Note that the configuration of the positioning section 111 may be other as long as the transfer sheet 121 can be positioned in the width direction. For example, instead of the guide groove 111a, a pair of barrier sections may be formed in the width direction.

[0047] The transfer sheet 121, conveyed via the expander roll 110, is then transferred to the positive electrode side sheet member 300 by the first positive electrode side transfer roller 120. To perform this transfer accurately, it is preferable that the transfer sheet 121 and the positive electrode side sheet member 300 are parallel during the transfer press by the first positive electrode side transfer roller 120. In this embodiment, as described above, a positioning section 111 for positioning the transfer sheet 121 is formed on the expander roll 110, so that tension is applied to the transfer sheet 121 in the width direction (and conveying direction), making it possible to achieve the desired parallel state between the transfer sheet 121 and the positive electrode side sheet member 300.

[0048] Thus, the expander roll 110 has the function of applying tension to the transfer sheet 121 in the width direction, as well as the function of making the transfer sheet 121 parallel to the positive electrode side sheet member 300. In other words, it can be said that the expander roll 110 also has the function of adjusting the angle at which the transfer sheet 121 enters the positive electrode side sheet member 300 in order to achieve that parallel state.

[0049] A peeling roller 130 is positioned downstream of the first positive electrode side transfer roller 120. The peeling roller 130 peels the base sheet 123 from the transfer sheet 121 on which the first solid electrolyte layer SE1 is provided. Specifically, as shown in Figure 3, it peels the base sheet 123 from the first solid electrolyte layer SE1 that has been transferred and pressed. At this time, the peeling roller 130 also functions as a restraint when peeling the base sheet 123 from the first solid electrolyte layer SE1. The peeled base sheet 123 is then wound up by a base roll body 131 that winds up the base sheet 123.

[0050] In this manner, the transfer sheet 121 unwound from the transfer sheet roll 122 is subjected to tension mainly in the width direction by the expander roll 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 base sheet 123 is wound up from the transferred first solid electrolyte layer SE1 by the base sheet roll 131 via the release roller 130.

[0051] As shown in Figure 3, the transfer sheet 121 is provided on both sides of the positive electrode sheet member 300 so as to be vertically symmetrical, and is configured to transfer the first solid electrolyte layer SE1 to both sides of the positive electrode sheet member 300. This allows the first solid electrolyte layer SE1 to be transferred to both sides of the positive electrode sheet member 300 simultaneously.

[0052] On the other hand, 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, and the base sheet 123 is wound up from the transferred first solid electrolyte layer SE1 by the peeling roller 130, distortion may occur in the positive electrode side sheet member 300 due to the relationship between the pressure applied when transferring the first solid electrolyte layer SE1 and the shear force applied when peeling the base sheet 123 from the first solid electrolyte layer SE1. If, while such distortion is present, the positive electrode press roll 190 (described later) is used to densify and increase the density of the first solid electrolyte layer SE1 and the positive electrode side sheet member 300, the accuracy of the transfer between the positive electrode side sheet member 300 and the first solid electrolyte layer SE1 may decrease. Therefore, in this embodiment, a vertically movable guide roll 180 is provided to suppress such distortion of the positive electrode side sheet member 300 after transfer by the first positive electrode side transfer roller 120 and after peeling by the peeling roller 130.

[0053] The vertically movable guide roll 180 corrects the strain generated in the positive electrode side sheet member 300 onto which the first solid electrolyte layer SE1 has been transferred. Specifically, it equalizes the tension on the positive electrode side sheet member 300 by releasing or reducing the pressure applied by the transfer by the first positive electrode side transfer roller 120. In other words, the vertically movable guide roll 180 controls the tension applied by the transfer by the first positive electrode side transfer roller 120 and the peeling by the peeling roller 130.

[0054] In this embodiment, multiple vertically movable guide rolls 180 are provided. In the example shown in Figure 3, six vertically movable guide rolls 180 are provided on both sides of the positive electrode side sheet member 300. These vertically movable guide rolls 180 are defined here as the first vertically movable guide roll 180a, the second vertically movable guide roll 180b, the third vertically movable guide roll 180c, the fourth vertically movable guide roll 180d, the fifth vertically movable guide roll 180e, and the sixth vertically movable guide roll 180f, starting from the upstream side. In the example shown in Figure 3, the first vertically movable guide roll 180a, the third vertically movable guide roll 180c, the fourth vertically movable guide roll 180d, and the sixth vertically movable guide roll 180f are arranged on the lower side of the positive electrode side sheet member 300, while the second vertically movable guide roll 180b and the fourth vertically movable guide roll 180d are arranged on the upper side of the positive electrode side sheet member 300. This arrangement may be appropriately changed depending on the distortion of the positive electrode side sheet member 300. For example, the same number of vertically movable guide rolls 180 may be arranged on the upper and lower sides of the positive electrode side sheet member 300. Alternatively, for example, the vertically movable guide rolls 180 may be arranged facing each other with the positive electrode side sheet member 300 in between, similar to the configuration of the first positive electrode side transfer roller 120.

[0055] Furthermore, on the conveyor line, the pair of rolls positioned between the third vertically movable guide roll 180c and the fourth vertically movable guide roll 180d are adjustment rolls 320 for adjusting the distortion of the positive electrode side sheet member 300 onto which the first solid electrolyte layer SE1 has been transferred, similar to the vertically movable guide rolls 180.

[0056] Thus, in this embodiment, the tension of the distorted positive electrode side sheet member 300 is controlled and adjusted by the vertically movable guide roll 180, thereby correcting the distortion of the positive electrode side sheet member 300, improving the accuracy of subsequent pressing by the positive electrode press roll 190, and improving the accuracy of the transfer between the first solid electrolyte layer SE1 and the positive electrode side sheet member 300.

[0057] As shown in Figure 2, the second positive electrode side transfer roller 140 transfers the second solid electrolyte layer SE2 onto the positive electrode side sheet member 300, which has been pressed with the first solid electrolyte layer SE1 transferred onto it.

[0058] As shown in Figure 5, the intermediate layer transfer roller 150 transfers the intermediate layer 5 onto the negative electrode active material layer 21, which is laminated on the negative electrode current collector foil 22a. As a result, the intermediate layer 5 is positioned between the negative electrode active material layer 21 and the negative electrode side solid electrolyte layer SE3.

[0059] As shown in Figure 5, 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.

[0060] As shown in Figure 2, the negative electrode side sheet member lamination roller 170 transports and laminates the negative electrode side sheet member 310, on which the negative electrode side solid electrolyte layer SE3 has been transferred, 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.

[0061] The positive electrode press roll 190 and the integrated press roll 200, like each transfer roller, are each composed of a pair of rotating rollers. The positive electrode side sheet member 300, on which solid electrolyte layers and the like are laminated according to each process, is passed through the pair of rollers under pressure to achieve densification and high density. The positive electrode press roll 190 has a larger outer diameter and greater pressing pressure than the first positive electrode side transfer roller 120 described above, as shown in Figure 3, for example. In this embodiment, the positive electrode press roll 190 presses the positive electrode side sheet member 300 on which the first solid electrolyte layer SE1 has been transferred. The surface of the positive electrode press roll 190 is, for example, hard chrome plated.

[0062] The integrated press roll 200 presses the electrodes 10 together with the positive electrode sheet member 300 and the negative electrode sheet member 310 stacked on top of each other. As a result, the positive electrode sheet member 300 and the negative electrode sheet member 310 are integrated, and at the same time, the first solid electrolyte layer SE1, the second solid electrolyte layer SE2, and the negative electrode solid electrolyte layer SE3 are made denser.

[0063] [Manufacturing method for all-solid-state batteries] Next, a method for manufacturing an all-solid-state battery using the press device 100 configured as described above will be explained. Figure 6 is a flowchart showing an example of the method for manufacturing the all-solid-state battery. The method for manufacturing the all-solid-state battery includes the following steps: a positive electrode side sheet member feeding 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 lamination step S9, and an integration pressing step S10. The first solid electrolyte layer transfer step S2 includes a tension application step S20 and a transfer step S21.

[0064] The positive electrode side sheet member feeding step S1 is a step in which the positive electrode side sheet member 300 is conveyed and fed out by a conveying roller (not shown). That is, the positive electrode side sheet member 300, which is formed by coating the positive electrode active material onto the positive electrode current collector foil 42a that constitutes the positive electrode current collector layer 42 and then laminating it, is fed out.

[0065] The first solid electrolyte layer transfer step S2 is a step in which 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. Specifically, the first solid electrolyte layer transfer step S2 performs the tension application step S20 and the transfer step S21.

[0066] The tension-applying step S20 is a step in which tension is applied in the width direction to the transfer sheet 121 unwound from the transfer sheet roll body 122 by the expander roll 110 described above. That is, since the diameter of the central part of the expander roll 110 is larger than the diameter of both ends, tension is applied in the width direction as the transfer sheet 121 is pulled toward both ends of the expander roll 110. Furthermore, as described above, the transfer sheet 121 is positioned in the width direction by the guide groove 111a formed in the expander roll 110, so that tension is applied in the width direction and the transfer sheet 121 and the positive electrode side sheet member 300 become parallel, and the transfer step S21 described later can be performed while maintaining this parallel state.

[0067] The transfer step S21 is a step in which the first solid electrolyte layer SE1 on the tensioned transfer sheet 121 is transferred to the positive electrode side sheet member 300. Specifically, the first solid electrolyte layer SE1 is passed over the positive electrode side sheet member 300 under pressure by a pair of first positive electrode side transfer rollers 120 to perform a transfer press. The pressure at this time is, for example, 50 to 500 MPa at a predetermined temperature (for example, 10 to 150°C). Preferably, it is 100 MPa at 25°C.

[0068] The peeling step S3 is a step in which the base sheet 123 is peeled off from the first solid electrolyte layer SE1 after the transfer step S21. Specifically, the base sheet 123 is peeled off from the first solid electrolyte layer SE1 that was transferred and pressed in the transfer step S21 by the peeling roller 130. Then, the peeled base sheet 123 is wound up by the base roll body 131.

[0069] In the tension control step S4, the tension applied to the positive electrode side sheet member 300, to which the first solid electrolyte layer SE1 has been transferred, by the transfer in the transfer step S21 and the peeling in the peeling step S3 is controlled. Specifically, the vertically movable guide roll 180 is used to release or reduce the pressure applied to the positive electrode side sheet member 300 in the transfer step S21, thereby equalizing the tension applied to the positive electrode side sheet member 300. This corrects the distortion of the positive electrode side sheet member 300 caused by the transfer in the transfer step S21 and the peeling in the peeling step S3. By performing this process before the positive electrode press step S5 described later, the distortion of the positive electrode side sheet member 300 can be adjusted before densification and density enhancement of the positive electrode side sheet member 300 to which the first solid electrolyte layer SE1 has been transferred, thus avoiding the densification and density enhancement processes being carried out in a distorted state.

[0070] The positive electrode pressing step S5 is a step in which the positive electrode side sheet member 300, to which the first solid electrolyte layer SE1 has been transferred, is pressed by the positive electrode pressing roll 190 on the same transport line as the transfer step S21 described above, thereby densifying and increasing the density of the positive electrode side sheet member 300 to which the first solid electrolyte layer SE1 has been transferred. 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 greater pressure than in the transfer step S21, the positive electrode is densified and increased in density. The pressing pressure for increasing density is, for example, about 300 to 1200 MPa at 25 to 100°C. The laminate of the high-density positive electrode side sheet member 300 and the first solid electrolyte layer SE1 is transported downstream on the transport line.

[0071] In this way, by performing the transfer step S21 and the positive electrode press step S5 on the same transport line, the accuracy of the transfer can be improved compared to, for example, performing the transfer step S21 and the positive electrode press step S5 on separate lines, and appropriate densification and density can be achieved.

[0072] The second solid electrolyte layer transfer step S6 is a step in which, after the positive electrode press step S5, the second solid electrolyte layer SE2 is transferred onto the positive electrode side sheet member 300, which has been pressed with the first solid electrolyte layer SE1 transferred onto it, by 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 positioned on the positive electrode side sheet member 300, to which the first solid electrolyte layer SE1 has been transferred, within a range guided by a guide roller (not shown). Then, the second solid electrolyte layer SE2 is passed over the positive electrode side sheet member 300 under pressure by the second positive electrode side transfer roller 140, which acts as a transfer roller, and a transfer press is performed. The pressure at this time is, for example, 50 to 500 MPa at a predetermined temperature (for example, 10 to 150°C). In this way, the positive electrode side sheet member 300 is pressed two or more times. Preferably, it is 150 MPa at 25°C.

[0073] Meanwhile, the negative electrode side sheet member 310 is prepared at a location separate from the transport line. First, as shown in the upper part of Figure 5, the intermediate layer 5 is transferred to the negative electrode active material layer 21 laminated on the negative electrode current collector foil 22a by the intermediate layer transfer roller 150 (intermediate layer transfer step S7). Then, as shown in the lower part of Figure 5, 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). As a result, the intermediate layer 5 is positioned between the negative electrode active material layer 21 and the negative electrode side solid electrolyte layer SE3. In this embodiment, the negative electrode side sheet member 310 includes a laminated structure of the negative electrode current collector foil 22a, the negative electrode active material layer 21, the intermediate layer 5, and the negative electrode side solid electrolyte layer SE3, but the negative electrode active material layer 21 and the intermediate layer 5 may be omitted.

[0074] The intermediate layer transfer step S7 involves aligning the intermediate layer 5 onto the negative electrode active material layer 21 so that it is positioned within a range guided by a guide roller (not shown). Then, the intermediate layer 5 is passed over the negative electrode active material layer 21 under pressure by an intermediate layer transfer roller 150, which acts as a transfer roller, to perform an intermediate layer transfer press, transferring the intermediate layer 5 to the negative electrode active material layer 21. The pressure at this time is, for example, 50 to 800 MPa at a predetermined temperature (for example, 10 to 150°C). More preferably, it is in the range of 300 MPa or more and 800 MPa or less at 25°C.

[0075] The negative electrode solid electrolyte layer transfer step S8 involves aligning the negative electrode solid electrolyte layer SE3 on the intermediate layer 5 so that it is positioned within a range guided by a guide roller (not shown). Then, the negative electrode solid electrolyte layer SE3 is passed over the intermediate layer 5 under pressure by the negative electrode transfer roller 160, which acts as a transfer roller, to perform a negative electrode active material layer transfer press, transferring the negative electrode solid electrolyte layer SE3 to the intermediate layer 5. The pressure at this time is, for example, 600 to 800 MPa at a predetermined temperature (for example, 10 to 150°C).

[0076] Regarding pressure, the pressing pressure in the positive electrode pressing step S5 is not only the maximum pressure applied to the positive electrode side sheet member 300, but also the maximum pressing pressure in the entire pressing device method. The positive electrode side sheet member 300 is pressed at high pressure to increase its energy density and densify the electrode 10. The maximum pressing pressure in the positive electrode pressing step S5 is greater than or equal to the maximum pressing pressure applied to the negative electrode side sheet member 310.

[0077] 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 less than the pressing pressure in the positive electrode pressing step S5. Also, the pressure during the transfer of the first solid electrolyte layer in step S2 and the second solid electrolyte layer in step S6 is less than the pressing pressure in the negative electrode solid electrolyte layer in step S8.

[0078] Since the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 contain a relatively large amount of binder, the press pressure during transfer can be reduced. Furthermore, by setting the transfer press pressure as low as possible, the amount of stretching of the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 due to the transfer press can be reduced. Therefore, in the subsequent integration press step S10, etc., room is left for the first solid electrolyte layer SE1 and the second solid electrolyte layer SE2 to stretch, and the first solid electrolyte layer SE1 can be stretched to follow the positive electrode layer 4. This improves the bonding of the first solid electrolyte layer SE1 with the positive electrode active material layer 41.

[0079] After the negative electrode side solid electrolyte layer transfer step S8, the formed negative electrode side sheet member 310 is cut with a cutter while being supported by the feed roll that feeds out the material to be 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.

[0080] The negative electrode side sheet member 310, cut to the design dimensions, is transported to the positive electrode side sheet member 300 so as to merge with the transport line of the positive electrode side sheet member 300, as shown in Figures 2 and 6, and is stacked on the positive electrode side sheet member 300. At this time, prior to the integration press step S10 described later, a first solid electrolyte layer SE1 is provided on the lower side of the positive electrode side sheet member 300, and a second solid electrolyte layer SE2 is provided on top of it, on the surface of the positive electrode side sheet member 300 facing the negative electrode side solid electrolyte layer SE3. Then, in its cut state, the negative electrode side sheet member 310 is placed on the positive electrode side sheet member 300.

[0081] Specifically, in the negative electrode side sheet member lamination step S9, the negative electrode side sheet member 310, on which the negative electrode side solid electrolyte layer SE3 has been transferred, is transported and laminated 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, by the negative electrode side sheet member lamination roller 170. In the negative electrode side sheet member lamination step S9, the negative electrode side sheet member 310, cut to the design dimensions, is positioned on 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, within a range guided by a guide roller (not shown).

[0082] Thus, with the positive electrode sheet member 300 and the negative electrode sheet member 310 stacked, the electrodes 10 are pressed together by the integrating press roll 200 (integrating press step S10). Immediately before the integrating press step S10, the thickness of the positive electrode sheet member 300 is greater than that of the negative electrode sheet member 310 in the stacking direction. The pressure at this time is, for example, about 500 to 900 MPa at 25 to 100°C. The integrating press step S10 integrates the positive electrode sheet member 300 and the negative electrode sheet member 310, and at the same time, the first solid electrolyte layer SE1, the second solid electrolyte layer SE2, and the negative electrode solid electrolyte layer SE3 become denser. Comparing the press pressures of the integrated press step S10 and the positive electrode press step S5, the press pressure of the positive electrode press step S5 is greater than the press pressure of the integrated press step S10.

[0083] After the integration press step S10, the formed electrode 10 is cut with a rotary cutter.

[0084] Furthermore, the following processes—transfer of the first solid electrolyte layer SE1 in the first solid electrolyte layer transfer step S2, peeling of the base sheet 123 in the peeling step S3, pressing of the positive electrode side sheet member 300 in the positive electrode pressing step S5, transfer of the second solid electrolyte layer SE2 in the second solid electrolyte layer transfer step S6, lamination of the negative electrode side sheet member 310 before integration in the negative electrode side sheet member lamination step S9, and integration pressing in the integration pressing step S10—are performed on both sides of the positive electrode side sheet member 300 that was fed out in the positive electrode side sheet member feeding step S1. As a result, an all-solid-state battery 1 is obtained in which each layer is laminated symmetrically on both the upper and lower surfaces with the positive electrode side sheet member 300 in between.

[0085] While embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to these embodiments. It is clear to those skilled in the art that various modifications and alterations can be conceived within the scope of the claims, and these are also understood to naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiments may be combined in any way without departing from the spirit of the invention.

[0086] For example, in the above-described embodiment, various solid electrolyte layers were laminated on both sides of the positive electrode sheet member 300, but this lamination may be configured to be laminated on only one side. Also, in the above-described embodiment, the transfer sheet 121 was provided on both sides of the positive electrode sheet member 300, but it may be configured to be provided on only one side.

[0087] This specification contains at least the following information. The components indicated in parentheses in the embodiments described above are, but are not limited thereto.

[0088] (1) A method for manufacturing an all-solid-state battery (all-solid-state battery 1) in which a solid electrolyte layer (first solid electrolyte layer SE1) is pressed onto a positive electrode side sheet member (positive electrode side sheet member 300), A transfer step (transfer step S21) is performed to transfer the solid electrolyte layer to the positive electrode side sheet member, The system includes a positive electrode press step (positive electrode press step S5) on the same line, which densifies the solid electrolyte layer transferred in the transfer step and the positive electrode side sheet member. A method for manufacturing all-solid-state batteries.

[0089] According to (1), by performing the transfer step and the positive electrode pressing step on the same line, for example, the accuracy of the transfer and densification between the solid electrolyte layer and the positive electrode sheet member can be improved compared to when each step is performed on a separate line. In other words, when each step is performed on a separate line, errors may occur when attaching the solid electrolyte layer to the positive electrode sheet member, but by performing them on the same line, such errors can be reduced, and the accuracy of adhesion and interface formation between the solid electrolyte layer and the positive electrode sheet member can be improved.

[0090] (2) A method for manufacturing an all-solid-state battery as described in (1), The solid electrolyte layer is provided with a peelable substrate (substrate sheet 123). The system further comprises a peeling step (peeling step S3) for peeling the substrate from the solid electrolyte layer, The peeling step is, After the transfer step and before the positive electrode pressing step, the substrate is peeled off from the solid electrolyte layer. A method for manufacturing all-solid-state batteries.

[0091] According to (2), after transferring the solid electrolyte layer to the positive electrode sheet member, the substrate can be peeled off from the solid electrolyte layer.

[0092] (3) A method for manufacturing an all-solid-state battery as described in (2), The positive electrode side sheet member on which the solid electrolyte layer has been transferred further comprises a tension control step (tension control step S4) for controlling the tension applied by the transfer step and the peeling step, The tension control step is as follows: After the peeling step and before the positive electrode pressing step, the tension applied to the positive electrode side sheet member onto which the solid electrolyte layer has been transferred is controlled. A method for manufacturing all-solid-state batteries.

[0093] According to (3), the positive electrode side sheet member onto which the solid electrolyte layer has been transferred may become distorted by the transfer step and the peeling step. However, by controlling the tension in the tension control step and adjusting the tension, the tension applied to the positive electrode side sheet member can be made uniform, and as a result, the distortion of the positive electrode side sheet member can be corrected.

[0094] (4) A method for manufacturing an all-solid-state battery as described in (1) or (2), The pressure applied in the positive electrode pressing step is greater than the pressure applied in the transfer step. A method for manufacturing all-solid-state batteries.

[0095] According to (4), by applying higher pressure during the positive electrode pressing step, the solid electrolyte layer and the positive electrode side sheet member can be made denser and denser.

[0096] (5) A method for manufacturing an all-solid-state battery as described in (4), The pressing force of the positive electrode press step is 300 MPa to 1200 MPa. A method for manufacturing all-solid-state batteries.

[0097] According to (5), the solid electrolyte layer and the positive electrode sheet member can be reliably pressed together by applying a large pressure.

[0098] (6) A method for manufacturing an all-solid-state battery as described in (1) or (2), The positive electrode pressing step involves pressing the solid electrolyte layer transferred in the transfer step and the positive electrode side sheet member with a pair of hard chrome-plated positive electrode press rolls (positive electrode press rolls 190). A method for manufacturing all-solid-state batteries.

[0099] According to (6), hard chrome plating can improve the corrosion resistance and wear resistance of the positive electrode press roll.

[0100] (7) A method for manufacturing an all-solid-state battery as described in (6), The transfer step involves pressing the solid electrolyte layer onto the positive electrode sheet member using a pair of transfer rolls (first positive electrode side transfer roller 120). The outer diameter of the positive electrode press roll is larger than the outer diameter of the transfer roll. A method for manufacturing all-solid-state batteries.

[0101] According to (7), the fact that the roll diameter of the positive electrode press is larger than that of the transfer press roll ensures that the solid electrolyte layer and the positive electrode sheet material are made denser and higher in density.

[0102] (8) A method for manufacturing an all-solid-state battery as described in (1) or (2), The solid electrolyte layer is provided on both sides of the positive electrode sheet member. A method for manufacturing all-solid-state batteries.

[0103] According to (8), a solid electrolyte layer can be transferred to both sides of the positive electrode sheet member.

[0104] (9) A method for manufacturing an all-solid-state battery as described in (1) or (2), A positive electrode side sheet member feeding step (positive electrode side sheet member feeding step S1) feeds the positive electrode side sheet member, which has a positive electrode active material layer (positive electrode active material layer 41) laminated on a positive electrode current collector foil (positive electrode current collector foil 42a), A negative electrode side solid electrolyte layer transfer step (negative electrode side solid electrolyte layer transfer step S8) is performed by transferring a negative electrode side solid electrolyte layer (negative electrode side solid electrolyte layer SE3) onto a negative electrode active material layer (negative electrode active material layer 21) laminated on a 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), A negative electrode side sheet member lamination step (negative electrode side sheet member lamination step S9) is performed by laminating the negative electrode side sheet member, on which the negative electrode side solid electrolyte layer has been transferred, onto the positive electrode side sheet member, on which the solid electrolyte layer has been transferred. The system further includes an integration press step (integration press step S10) for pressing the positive electrode sheet member and the negative electrode sheet member together so that the electrode (electrode 10) becomes an integrated unit, The transfer step, the positive electrode press step, the negative electrode side sheet member lamination step, and the integration press step are performed on the same line with respect to the positive electrode side sheet member. A method for manufacturing all-solid-state batteries.

[0105] According to (9), the transfer step, the positive electrode pressing step, the negative electrode side sheet member lamination step, and the integration pressing step are performed on the same line with respect to the positive electrode side sheet member. This makes it possible to improve the adhesion of each layer and the accuracy of interface formation compared to, for example, when each step is performed on a separate line. [Explanation of Symbols]

[0106] 1 All-solid-state battery 10 electrodes 21 Negative electrode active material layer 22a Negative current collector foil 41 Positive electrode active material layer 42a Positive electrode current collector foil 120 First positive electrode side transfer roller (transfer roll) 123 Base sheet (base material) 190 Positive electrode press roll 300 Positive side sheet member 310 Negative electrode side sheet member SE1 1st solid electrolyte layer (solid electrolyte layer) SE3 Negative side solid electrolyte layer S1 Positive side sheet member feeding step S3 Peeling step S4 Tension control step S5 Positive electrode press step S8 Transfer step of the negative electrode side solid electrolyte layer S9 Lamination step of negative electrode side sheet member S10 Integrated Press Step S21 Transfer Step

Claims

1. A method for manufacturing an all-solid-state battery, comprising pressing a solid electrolyte layer onto a positive electrode sheet member, A transfer step of transferring the solid electrolyte layer to the positive electrode side sheet member, The system includes a positive electrode pressing step, which densifies the solid electrolyte layer transferred in the transfer step and the positive electrode side sheet member on the same line. A method for manufacturing all-solid-state batteries.

2. A method for manufacturing an all-solid-state battery according to claim 1, The solid electrolyte layer is provided with a peelable substrate. The process further comprises a peeling step of peeling the substrate from the solid electrolyte layer, The peeling step is, After the transfer step and before the positive electrode pressing step, the substrate is peeled off from the solid electrolyte layer. A method for manufacturing all-solid-state batteries.

3. A method for manufacturing an all-solid-state battery according to claim 2, The positive electrode side sheet member on which the solid electrolyte layer has been transferred further comprises a tension control step for controlling the tension applied by the transfer step and the peeling step, The tension control step is as follows: After the peeling step and before the positive electrode pressing step, the tension applied to the positive electrode side sheet member onto which the solid electrolyte layer has been transferred is controlled. A method for manufacturing all-solid-state batteries.

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

5. A method for manufacturing an all-solid-state battery according to claim 4, The pressing force of the positive electrode press step is 300 MPa to 1200 MPa. A method for manufacturing all-solid-state batteries.

6. A method for manufacturing an all-solid-state battery according to claim 1 or 2, The positive electrode pressing step involves pressing the solid electrolyte layer transferred in the transfer step and the positive electrode side sheet member with a pair of hard chrome-plated positive electrode pressing rolls. A method for manufacturing all-solid-state batteries.

7. A method for manufacturing an all-solid-state battery according to claim 6, The transfer step involves pressing the solid electrolyte layer onto the positive electrode sheet member using a pair of transfer rolls. The outer diameter of the positive electrode press roll is larger than the outer diameter of the transfer roll. A method for manufacturing all-solid-state batteries.

8. A method for manufacturing an all-solid-state battery according to claim 1 or 2, The solid electrolyte layer is provided on both sides of the positive electrode sheet member. A method for manufacturing all-solid-state batteries.

9. A method for manufacturing an all-solid-state battery according to claim 1 or 2, A positive electrode side sheet member feeding step involves feeding the positive electrode side sheet member, in which a positive electrode active material layer is laminated on a positive electrode current collector foil, A negative electrode side solid electrolyte layer transfer step involves transferring a negative electrode side solid electrolyte layer to a negative electrode active material layer laminated on a negative electrode current collector foil to form a negative electrode side sheet member, A negative electrode sheet member lamination step is to laminate the negative electrode sheet member, on which the negative electrode solid electrolyte layer has been transferred, onto the positive electrode sheet member, on which the solid electrolyte layer has been transferred. The system further comprises an integration press step of pressing the positive electrode sheet member and the negative electrode sheet member together in a stacked state so that the electrodes are integrated, The transfer step, the positive electrode press step, the negative electrode side sheet member lamination step, and the integration press step are performed on the same line with respect to the positive electrode side sheet member. A method for manufacturing all-solid-state batteries.

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