Method for manufacturing an electrode structure and electrode structure

Abstract

This method allows for the easy manufacture of electrode structures with suppressed burr generation, even when the end face is cut in the stacking direction. [Solution] The method includes the steps of: clamping a laminate, in which a positive electrode comprising a positive electrode current collector foil and a positive electrode active material layer and a negative electrode comprising a negative electrode current collector foil and a negative electrode active material layer are laminated with a solid electrolyte layer in between, using a jig in the lamination direction; and cutting the ends of the laminate clamped by the jig while they are heated in the lamination direction.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing an electrode structure and an electrode structure.

Background Art

[0002] Some solid-state batteries include a plurality of electrode structures in which a positive electrode including a positive electrode current collector foil and a positive electrode active material layer, and a negative electrode including a negative electrode current collector foil and a negative electrode active material layer are laminated via a solid electrolyte layer. When manufacturing the electrode structure, after laminating each layer, heating and pressing are performed to integrate them, and then the end faces are cut to align the end faces.

[0003] For example, in Patent Document 1, when cutting the electrode structure, in order to prevent sag or burrs from occurring in the positive electrode current collector foil, the solid electrolyte layer, and the negative electrode current collector foil, in an electrode laminate in which the positive electrode current collector foil, the positive electrode active material layer, the solid electrolyte layer, the negative electrode active material layer, and the negative electrode current collector foil are laminated in this order, on the lamination surface between the positive electrode current collector foil and the positive electrode active material layer or on the lamination surface between the negative electrode current collector foil and the negative electrode active material layer, an electrode laminate in which the positive electrode active material layer or the negative electrode active material layer has an exposed portion where the surface is exposed is disclosed. The electrode structure disclosed in Patent Document 1, in other words, is arranged such that the end of the positive electrode current collector foil is located inside the end of the positive electrode active material layer, and the end of the negative electrode current collector foil is located inside the end of the negative electrode active material layer.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, manufacturing an electrode structure like the one disclosed in Patent Document 1 requires extremely high precision in positioning the positive electrode current collector foil and the positive electrode active material layer, as well as the negative electrode current collector foil and the negative electrode active material layer, thus requiring advanced manufacturing technology. Consequently, the electrode structure disclosed in Patent Document 1 had the problem of being extremely difficult to manufacture.

[0006] Therefore, the present disclosure aims to provide a method for manufacturing an electrode structure and an electrode structure that can be easily manufactured in which the generation of burrs and the like is suppressed even when the end face is cut in the stacking direction. [Means for solving the problem]

[0007] Having achieved the objectives described above, this disclosure includes the following: <1> A method for manufacturing an electrode structure, comprising the steps of: clamping a laminate in the lamination direction with a jig, the laminate being formed by laminating a positive electrode including a positive electrode current collector foil and a positive electrode active material layer and a negative electrode including a negative electrode current collector foil and a negative electrode active material layer via a solid electrolyte layer; and cutting the ends of the laminate in the lamination direction while the laminate clamped with the jig is heated. <2> The laminated body sandwiched between the aforementioned jigs is heated by the aforementioned jigs. <1> A method for manufacturing the electrode structure described above. <3> The process further includes a step of heating the positive electrode, the solid electrolyte layer, and the negative electrode in a stacked state and applying pressure in the stacking direction, <1> or <2> A method for manufacturing the electrode structure described above. <4> The jig applies pressure to the laminate at an angle with respect to the lamination direction, in such a way that the cut surface of the laminate is pushed outward from the laminate. <1> ~ <3> A method for manufacturing an electrode structure as described in any one of the following. <5> After the cutting process, as the laminate dissipates heat, at least one of the positive electrode current collector foil and the negative electrode current collector foil at the cut surface shrinks inward within the laminate. <1> ~ <4> A method for manufacturing an electrode structure as described in any one of the following. <6> An electrode structure in which a positive electrode comprising a positive electrode current collector foil and a positive electrode active material layer, and a negative electrode comprising a negative electrode current collector foil and a negative electrode active material layer are laminated via a solid electrolyte layer, <1> ~ <5> An electrode structure manufactured by a method for manufacturing an electrode structure described in any one of the above, wherein at least one of the positive electrode current collector foil and the negative electrode current collector foil at at least one end face is located inside the positive electrode active material layer, the solid electrolyte layer and the negative electrode active material layer. <7> The end face is cut in the direction of the lamination while the temperature of the laminate is 140°C to 150°C. <1> ~ <5> A method for manufacturing an electrode structure as described in any one of the following. <8> An electrode structure in which a positive electrode comprising a positive electrode current collector foil and a positive electrode active material layer, and a negative electrode comprising a negative electrode current collector foil and a negative electrode active material layer are laminated via a solid electrolyte layer, <1> ~ <5> An electrode structure manufactured by a method for manufacturing an electrode structure described in any one of the above, wherein at least one of the positive electrode current collector foil and the negative electrode current collector foil at at least one end face is located inside the positive electrode active material layer, the solid electrolyte layer and the negative electrode active material layer. <9> Either the positive electrode current collector foil or the negative electrode current collector foil is located 3 μm to 10 μm inward from the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer. <8> The electrode structure described above. [Effects of the Invention]

[0008] According to this disclosure, an electrode structure in which the generation of burrs and the like is suppressed can be easily manufactured even when the end face of a laminate in which a positive electrode including a positive electrode current collector foil and a positive electrode active material layer and a negative electrode including a negative electrode current collector foil and a negative electrode active material layer are laminated via a solid electrolyte layer is cut in the lamination direction. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view of a main part showing one embodiment of a laminate fabricated by the manufacturing method of the electrode structure of this disclosure. [Figure 2] This is a cross-sectional view of a key part showing the state in which the laminate is pressurized in the manufacturing method of the electrode structure of this disclosure. [Figure 3]This is a cross-sectional view of a key part showing the step of cutting the end face of a laminate in the method for manufacturing an electrode structure according to the present disclosure. [Figure 4] This is a cross-sectional view of a main part showing one embodiment of an electrode structure manufactured by the manufacturing method of the electrode structure of the present disclosure. [Figure 5] This is a cross-sectional view of a key part of an electrode structure manufactured by a conventional method. [Figure 6] This is a cross-sectional view of a key part showing a state in which a laminate is pressurized, as shown in another embodiment of the method for manufacturing an electrode structure of the present disclosure. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure are described below. The description is illustrative and does not limit the scope of this disclosure.

[0011] In this disclosure, a numerical range indicated using "~" means a range that includes the numbers written before and after "~" as the minimum and maximum values, respectively. In the numerical ranges described in stages in this disclosure, the upper or lower limit stated in one numerical range may be replaced with the upper or lower limit of another numerical range described in stages. In the numerical ranges described in this disclosure, the upper or lower limit stated in one numerical range may be replaced with the values ​​shown in the examples. In this disclosure, the term "process" includes not only independent processes but also processes that cannot be clearly distinguished from other processes, as long as their intended purpose is achieved. In this disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In this disclosure, unless otherwise specified, the amount of each component refers to the total amount of multiple substances if there are multiple substances corresponding to each component. When embodiments are described in this disclosure with reference to the drawings, the configuration of such embodiments is not limited to the configuration shown in the drawings. Furthermore, the sizes of the components in each figure are conceptual, and the relative relationships between the sizes of the components are not limited thereto.

[0012] The method for manufacturing an electrode structure according to the present disclosure includes the steps of: clamping a laminate, in which a positive electrode including a positive electrode current collector foil and a positive electrode active material layer and a negative electrode including a negative electrode current collector foil and a negative electrode active material layer are laminated via a solid electrolyte layer, in the lamination direction using a jig; and cutting the ends of the laminate in the lamination direction while the laminate held by the jig is heated. According to the method for manufacturing an electrode structure according to the present disclosure, even if burrs are generated when the end faces of the laminate are cut in the lamination direction, an electrode structure can be manufactured in which the generation of foreign matter or short circuits that may degrade battery performance is suppressed. In the electrode structure according to the present disclosure, since the end faces of the positive electrode current collector foil and the end faces of the negative electrode current collector foil are located inside (inside the structure) of the laminated end faces of the positive electrode active material layer, the negative electrode active material layer and the solid electrolyte layer, even if burrs are generated by cutting, the burrs will be located inside the laminated end faces of the positive electrode active material layer, the negative electrode active material layer and the solid electrolyte layer. As a result, the method for manufacturing the electrode structure of this disclosure prevents burrs generated by cutting the positive electrode current collector foil and the negative electrode current collector foil from being lost and becoming foreign matter, and also prevents short circuits from occurring due to burrs generated by cutting the positive electrode current collector foil and the negative electrode current collector foil.

[0013] In the method for manufacturing an electrode structure according to the present disclosure, the state in which the laminate is heated means at least one of the following: the state in which the laminate is heated during the manufacturing stage and the elevated temperature state is maintained; the state in which the manufactured laminate is heated while being sandwiched in the stacking direction by a heated jig; or the state in which the manufactured laminate is heated by the jig after being sandwiched in the stacking direction by the jig. This also includes the mode in which the laminate is heated during the manufacturing stage and the elevated temperature state is maintained by heating or maintaining the temperature when the laminate is sandwiched in the stacking direction by the jig. That is, one embodiment of the method for manufacturing an electrode structure according to the present disclosure is a method in which the laminate sandwiched by the jig is heated.

[0014] Further, in the method for manufacturing the electrode structure of the present disclosure, before the step of sandwiching the laminate in the stacking direction by a jig in a heated state, the step of manufacturing the laminate can be included. In the method for manufacturing the electrode structure of the present disclosure, a positive electrode including a positive current collector foil and a positive active material layer and a negative electrode including a negative current collector foil and a negative active material layer are laminated via a solid electrolyte layer, and then, while heating, pressure is applied in the stacking direction to manufacture a laminate. That is, as one aspect of the method for manufacturing the electrode structure of the present disclosure, the method can further include a step of applying pressure in the stacking direction while heating the laminated positive electrode, solid electrolyte layer, and negative electrode.

[0015] In the method for manufacturing the electrode structure of the present disclosure, after the step of cutting the end portion of the laminate in the stacking direction, the laminate dissipates heat, so that the positive current collector foil and / or the negative current collector foil on the cut surface contracts in the inner direction of the laminate. As a result, in the electrode structure according to the present disclosure, the end surface of the positive current collector foil and the end portion of the negative current collector foil are located inside the stacked end surfaces of the positive active material layer, negative active material layer, and solid electrolyte layer.

[0016] Hereinafter, an embodiment of the method for manufacturing the electrode structure of the present disclosure (hereinafter referred to as the manufacturing method of the present embodiment) will be described with reference to the drawings. In the manufacturing method of the present embodiment, first, as shown in FIG. 1, the positive current collector foil 1 and the positive active material layer 2 and the negative current collector foil 3 and the negative active material layer 4 are laminated via the solid electrolyte layer 5. In the laminate shown in FIG. 1, the negative active material layer 4, the solid electrolyte layer 5, the positive active material layer 2, and the positive current collector foil 1 are laminated so as to be symmetric about the negative current collector foil 3. The configuration of the laminate shown in FIG. 1 is an example, and a configuration in which the positive current collector foil 1 and the positive active material layer 2 and the negative current collector foil 3 and the negative active material layer 4 are laminated via the solid electrolyte layer 5 may be used.

[0017] In the manufacturing method of this embodiment, as shown in Figure 2, the positive electrode current collector foil 1 and positive electrode active material layer 2 and the negative electrode current collector foil 3 and negative electrode active material layer 4 are laminated with a solid electrolyte layer 5 in between, and then heated and pressurized in the lamination direction (direction of arrow X in Figure 2). As an example, by heating and pressurizing while sandwiched between a pair of pressurizing plates 6A and 6B, a laminate can be produced in which the positive electrode current collector foil 1 and positive electrode active material layer 2 and the negative electrode current collector foil 3 and negative electrode active material layer 4 are laminated with a solid electrolyte layer 5 in between. At this time, the laminate produced can be bonded between adjacent layers by heating to 100°C or higher, 120°C or higher, and 140°C or higher. The upper limit of the heating temperature can be, for example, 170°C or lower, 160°C or lower, and 150°C or lower.

[0018] In the manufacturing method of this embodiment, as shown in Figure 3, the laminate is then clamped in the lamination direction by jigs 7A and 7B while heated, and the ends of the laminate clamped by jigs 7A and 7B are cut in the lamination direction. At this time, as shown in Figure 3, the ends of the laminate can be cut by a shearing device 8. The shearing device 8 cuts the end face of the laminate by driving the shearing blade in the direction of the white arrow in Figure 3. According to the manufacturing method of the electrode structure of this disclosure, as shown in Figure 4, the positive electrode current collector foil 1 and the negative electrode current collector foil 3 contract as the laminate dissipates heat, and an electrode structure can be manufactured in which the end face of the positive electrode current collector foil 1 and the end face of the negative electrode current collector foil 3 are located inside the laminated end face of the positive electrode active material layer 2, the negative electrode active material layer 4 and the solid electrolyte layer 5.

[0019] In the manufacturing method of this embodiment, as shown in Figure 4, when the end face of the laminate is cut, a burr 9 may be formed on the end of the positive electrode current collector foil 1 and / or a burr 10 may be formed on the end of the negative electrode current collector foil 3. However, in the electrode structure manufactured by the manufacturing method of this embodiment, the end face of the positive electrode current collector foil 1 and the end of the negative electrode current collector foil 3 are located inside the laminated end face of the positive electrode active material layer 2, the negative electrode active material layer 4 and the solid electrolyte layer 5. Therefore, these burrs 9 and 10 are contained inside the electrode structure, preventing them from falling off as foreign matter or causing a short circuit. For example, when the end of the laminate is cut, if the laminate is at room temperature (e.g., 25°C) and not heated, as shown in Figure 5, if the burr 9 formed on the end of the positive electrode current collector foil 1 and / or the burr 10 formed on the end of the negative electrode current collector foil 3 fall off as foreign matter, the burrs 9 and / or 10 may cause a short circuit.

[0020] In particular, according to the manufacturing method of this embodiment, the ends of the positive electrode current collector foil 1 and the negative electrode current collector foil 3 can be located inward from the laminated end faces of the positive electrode active material layer 2, the negative electrode active material layer 4, and the solid electrolyte layer 5 within a range of 3 μm to 10 μm, preferably 3 μm to 8 μm, and more preferably 3 μm to 6 μm. By positioning the ends of the positive electrode current collector foil 1 and the negative electrode current collector foil 3 inward within this range from the laminated end faces of the positive electrode active material layer 2, the negative electrode active material layer 4, and the solid electrolyte layer 5, it is possible to more reliably prevent burrs 9 and 10 from falling off as foreign matter or causing short circuits.

[0021] Furthermore, in the manufacturing method of this embodiment, jigs 7A and 7B may be equipped with heating devices for heating the laminate. However, since the laminate is heated in the process shown in Figure 2, if the temperature of the laminate can be maintained within a desired range, jigs 7A and 7B do not need to be equipped with heating devices. When cutting the ends of the laminate, the temperature of the laminate is preferably in the range of 120°C to 170°C, more preferably in the range of 130°C to 160°C, and even more preferably in the range of 140°C to 150°C. By setting the temperature of the laminate within this range, the positive electrode current collector foil 1 and the negative electrode current collector foil 3 can be softened, and the cutting resistance of the shearing blade of the shearing device 8 can be reduced. This makes it possible to extend the lifespan of the shearing device 8.

[0022] Furthermore, in the manufacturing method of this embodiment, it is preferable to cut the ends of the laminate in the lamination direction while the laminate is heated and pressurized in the lamination direction (direction of arrow X in Figure 3). For example, the laminate can be pressurized in the lamination direction (direction of arrow X in Figure 3) by driving jig 7A in the direction of jig 7B. By pressurizing the laminate in the lamination direction in this way, the ends of the positive electrode current collector foil 1 and the ends of the negative electrode current collector foil 3 can be positioned further inward than the laminated end faces of the positive electrode active material layer 2, the negative electrode active material layer 4, and the solid electrolyte layer 5. This more reliably prevents burrs generated by cutting from becoming foreign matter and more reliably prevents short circuits caused by burrs generated by cutting the positive electrode current collector foil and the negative electrode current collector foil.

[0023] Incidentally, the method for manufacturing an electrode structure of the present disclosure is not limited to the manufacturing method of the embodiments described above, and includes the steps of: heating a laminate in which a positive electrode comprising a positive electrode current collector foil and a positive electrode active material layer and a negative electrode comprising a negative electrode current collector foil and a negative electrode active material layer are laminated via a solid electrolyte layer, and then clamping the laminate in the lamination direction with a jig; and cutting the end face of the laminate clamped by the jig in the lamination direction, wherein the jig applies pressure to the laminate at an angle from the lamination direction in a direction that pushes the end face to be cut outward. By setting the direction of pressure applied to the laminate to a direction that is inclined from the lamination direction in a direction that pushes the cut end face of the laminate outward, the end faces of the positive electrode current collector foil 1 and the negative electrode current collector foil 3 can be positioned further inward than the end faces of the positive electrode active material layer 2, the negative electrode active material layer 4, and the solid electrolyte layer 5. This more reliably prevents the burrs 9 or 10 generated by the cutting from being lost and becoming foreign matter, and more reliably prevents short circuits from being caused by the burrs 9 or 10 generated by the cutting.

[0024] In this embodiment of the manufacturing method, as shown in Figure 6, the laminate can be heated, and the laminate can be sandwiched between jigs 12A and 12B, and the end face of the laminate can be cut in the lamination direction while the laminate is pressed at an angle with respect to the lamination direction in a direction that pushes the cut surface of the laminate outward (direction of arrow Y in Figure 6). For example, by driving jig 12A in the direction of arrow Y, the pressurization described above can be achieved. In this way, by pressing at an angle from the lamination direction in a direction that pushes the end face to be cut outward, the ends of the positive electrode current collector foil 1 and the negative electrode current collector foil 3 can be positioned further inward than the laminated end faces of the positive electrode active material layer 2, the negative electrode active material layer 4, and the solid electrolyte layer 5, and the burrs generated by the cutting are removed and become foreign matter.

[0025] Furthermore, multiple electrode structures according to this disclosure are prepared, and the positive electrode current collectors located in the outermost layers are joined together to be used as electrodes for a solid-state battery. A solid-state battery using the electrode structure according to this disclosure is prevented from generating foreign matter from the positive electrode current collector and the negative electrode current collector, and short circuits caused by burrs formed on the ends of the positive electrode current collector and the negative electrode current collector are prevented, resulting in excellent battery characteristics. The materials of each element in the electrode structure according to this disclosure will be described below, but the manufacturing method of the electrode structure according to this disclosure, the electrode structure, and the solid-state battery using said electrode structure are not limited to the following materials.

[0026] [Cathode active material layer] The positive electrode active material contained in the positive electrode active material layer can be any material that is conventionally known. Examples of positive electrode active materials include LiCoO2, lithium nickel-containing composite oxides, LiMn2O4, olivine-type lithium iron phosphate, TiS2, MnO2, MoO3, V2O5, etc. The positive electrode active material may contain any of these compounds individually or in combination.

[0027] [Positive current collector foil] The positive electrode current collector foil can be any of the types commonly used as positive electrode current collector foils for batteries. Furthermore, the positive electrode current collector foil may be in the form of foil, plate, mesh, perforated metal, or foam. Examples of metals that make up the positive electrode current collector foil include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. In particular, from the viewpoint of ensuring oxidation resistance, the positive electrode current collector foil may contain Al.

[0028] [Negative electrode active material layer] The negative electrode active material contained in the negative electrode active material layer is not particularly limited, and conventionally known materials can be used as appropriate. Examples of negative electrode active materials include carbon materials. Examples of carbon materials include coke such as petroleum coke, pitch coke, and coal coke; carbon black such as carbides of organic compounds, carbon fiber, and acetylene black; and graphite such as artificial graphite and natural graphite. In addition to these, conductive polymers, lithium titanate, silicon, and silicon compounds can also be used as negative electrode active materials. The above-mentioned materials may be used individually or in combination.

[0029] [Negative electrode current collector foil] The materials constituting the negative electrode current collector foil are not particularly limited, and materials conventionally used in the manufacture of negative electrodes can be used. The materials for the negative electrode current collector foil are not particularly limited, and examples include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel, with Al or Cu being particularly preferred. Furthermore, the negative electrode current collector foil can be in the form of foil, perforated foil, mesh, or other strip-like forms.

[0030] [Solid electrolyte layer] The solid electrolyte layer contains a solid electrolyte. Preferably, the solid electrolyte contained in the solid electrolyte layer contains at least one type of solid electrolyte selected from the group of solid electrolytes consisting of sulfide solid electrolytes, oxide solid electrolytes, and halide solid electrolytes.

[0031] As a sulfide solid electrolyte, it is preferable to contain sulfur (S) as the main component of the anionic element, and it is preferable to further contain, for example, Li, A, and S in addition to S. Element A is at least one selected from the group consisting of P, As, Sb, Si, Ge, Sn, B, Al, Ga, and In. The sulfide solid electrolyte may further contain at least one of O and a halogen element. As an oxide solid electrolyte, it is preferable to contain oxygen (O) as the main component of the anionic element, and it may also contain, for example, Li, element Q (Q represents at least one of Nb, B, Al, Si, P, Ti, Zr, Mo, W, and S), and O. Examples of oxide solid electrolytes include garnet-type solid electrolytes, perovskite-type solid electrolytes, NASICON-type solid electrolytes, Li-PO-based solid electrolytes, Li-BO-based solid electrolytes, and the like. As the halide solid electrolyte, a solid electrolyte containing Li, M, and X (where M represents at least one of Ti, Al, and Y, and X represents F, Cl, or Br) is preferred.

[0032] Examples of solid electrolyte layers include electrolyte layers used in semi-solid-state batteries and all-solid-state batteries. When a solid electrolyte is included, the electrolyte may also contain less than 10% by mass of an electrolyte relative to the total amount of electrolyte. The type of electrolyte is not particularly limited, and known electrolytes can be used. Specific examples of electrolytes include liquids obtained by dissolving lithium salts such as LiPF6 and LiFSi in an organic solvent.

[0033] [Exterior] A solid-state battery using the electrode structure according to this disclosure may further include an outer casing. The outer casing at least houses the electrode structure described above. Examples of outer casings include laminate-type outer casings and case-type outer casings. A laminate-type outer casing may be formed from a laminate (laminate film) having a metal layer containing a metal such as aluminum and a heat-seal layer containing a resin that melts upon heating.

[0034] [Restraining member] A solid-state battery using the electrode structure according to this disclosure may further include a restraining member. The restraining member applies a restraining pressure to the electrode structure in the thickness direction. The restraining pressure applied to the electrode structure in the thickness direction may be, for example, 0.1 MPa or more, 1 MPa or more, or 5 MPa or more. The restraining pressure applied to the electrode structure in the thickness direction may be, for example, 100 MPa or less, 50 MPa or less, or 20 MPa or less. [Explanation of Symbols]

[0035] 1... Positive electrode current collector foil, 2... Positive electrode active material layer, 3... Negative electrode current collector foil, 4... Negative electrode active material layer, 5... Solid electrolyte layer, 6A, 6B... Pressure plate, 7A, 7B... Jig, 8... Shearing device, 9... Burr, 10... Burr

Claims

1. A process in which a laminate is formed by laminating a positive electrode including a positive electrode current collector foil and a positive electrode active material layer, and a negative electrode including a negative electrode current collector foil and a negative electrode active material layer, with a solid electrolyte layer in between, is sandwiched in the lamination direction by a jig, A step of cutting the end of the laminate in the lamination direction while the laminate held by the jig is heated, A method for manufacturing an electrode structure containing the electrode structure.

2. A method for manufacturing an electrode structure according to claim 1, wherein a laminate sandwiched between the jig is heated by the jig.

3. A method for manufacturing an electrode structure according to claim 1, further comprising the step of heating and applying pressure in the stacking direction while stacking the positive electrode, the solid electrolyte layer, and the negative electrode.

4. The method for manufacturing an electrode structure according to claim 1, wherein the jig applies pressure to the laminate at an inclination with respect to the lamination direction in a direction in which the cut surface of the laminate is pushed outward from the laminate.

5. The method for manufacturing an electrode structure according to claim 1, wherein, after the cutting step, the laminate dissipates heat, causing at least one of the positive electrode current collector foil and the negative electrode current collector foil at the cut surface to shrink inward of the laminate.

6. An electrode structure comprising a positive electrode including a positive electrode current collector foil and a positive electrode active material layer, and a negative electrode including a negative electrode current collector foil and a negative electrode active material layer, laminated via a solid electrolyte layer, manufactured by the method for manufacturing an electrode structure according to any one of claims 1 to 5, wherein at least one of the positive electrode current collector foil and the negative electrode current collector foil at at least one end face is located inside the positive electrode active material layer, the solid electrolyte layer and the negative electrode active material layer.

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