All-solid-state battery and method for manufacturing the all-solid-state battery

Abstract

To provide an all-solid battery that reduces stress concentration on a solid electrolyte layer during pressure bonding, and a manufacturing method thereof.SOLUTION: An all-solid battery 100 according to the present invention includes: a solid electrolyte layer 5; a negative electrode active material layer 4 and a positive electrode active material layer 3 sandwiching the solid electrolyte layer 5; and a negative electrode current collector 2 sandwiching the negative electrode active material layer 4 together with the solid electrolyte layer 5. An outer peripheral end 41 of the negative electrode active material layer 4 is inclined toward the negative electrode current collector 2 side, and an edge 311 of an outer peripheral end 31 of the positive electrode active material layer 3 on the solid electrolyte layer 5 side is arranged between an edge 411 of the outer peripheral end 41 of the negative electrode active material layer 4 on the solid electrolyte layer 5 side and an edge 412 of the outer peripheral end 41 of the negative electrode active material layer 4 on the negative electrode current collector 2 side in plan view.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art Conventionally, all-solid-state batteries that include a solid electrolyte layer between a positive electrode and a negative electrode are known.

[0003] An all-solid-state battery is formed by sandwiching a solid electrolyte layer between a positive electrode and a negative electrode and then pressure bonding them in the thickness direction (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-118870 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when pressure bonding is performed as described above, there is a risk that the solid electrolyte layer will be damaged due to stress concentration on the solid electrolyte layer, causing the positive electrode and the negative electrode to short-circuit with each other.

[0006] An object of the present invention is to provide an all-solid-state battery that reduces stress concentration on a solid electrolyte layer during pressure bonding, and a method for manufacturing the same. [Means for solving the problem]

[0007] The all-solid-state battery according to the present invention includes a solid electrolyte layer, one electrode and another electrode sandwiching the solid electrolyte layer, and a first current collector sandwiching the one electrode together with the solid electrolyte layer, an end of the one electrode being inclined toward the first current collector, an edge of one electrode on the solid electrolyte side is disposed outside an edge of the other electrode on the solid electrolyte side in a plan view; The edge of the end of the other electrode on the solid electrolyte layer side is disposed between the edge of the end of the one electrode on the solid electrolyte layer side and the edge of the end of the one electrode on the first current collector side in a plan view. Effect of the Invention

[0008] According to the present invention, the inclined end of one electrode is spaced from the first current collector. Therefore, even if one electrode is pressed from the first current collector side, pressure is not directly applied to the end. Therefore, it is possible to suppress stress concentration on the edge on the solid electrolyte layer side of the end of the other electrode on the opposite side of the solid electrolyte layer from the end, and on the portion of the solid electrolyte layer in contact with the edge. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view illustrating a unit cell layer included in the all-solid-state battery of the first embodiment. [Diagram 2] FIG. 2 is a diagram showing pressure applied to a unit cell layer included in the all-solid-state battery of the first embodiment. [Diagram 3] FIG. 3 is a diagram showing pressure applied to a unit cell layer included in an all-solid-state battery of a comparative example. [Figure 4] FIG. 4 is a cross-sectional view illustrating a cell layer included in the all-solid-state battery according to the first modified example of the first embodiment. [Diagram 5] FIG. 5 is a cross-sectional view illustrating a unit cell layer included in the all-solid-state battery according to the second modified example of the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view illustrating a unit cell layer included in the all-solid-state battery according to the third modified example of the first embodiment. [Figure 7] FIG. 7 is a diagram showing pressure applied to a unit cell layer included in the all-solid-state battery of the second embodiment. [Figure 8] FIG. 8 is a cross-sectional view illustrating a unit cell layer included in the all-solid-state battery according to the first modified example of the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view illustrating a unit cell layer included in an all-solid-state battery according to a second modified example of the second embodiment. [Figure 10] FIG. 10 is a cross-sectional view illustrating a unit cell layer included in an all-solid-state battery according to a third modified example of the second embodiment. [Figure 11] FIG. 11 is a cross-sectional view illustrating a unit cell layer included in the all-solid-state battery according to the third embodiment. [Figure 12] FIG. 12 is a diagram illustrating the process of cutting off the ends of the electrodes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [First embodiment] An all-solid-state battery 100 according to a first embodiment of the present invention will be described.

[0011] 1 is a diagram illustrating a unit cell layer 9 included in an all-solid-state battery 100 of the first embodiment. The all-solid-state battery 100 of this embodiment is a so-called stacked type all-solid-state battery 100 that houses a power generating element in which a plurality of unit cell layers 9 described below are stacked, sealed with a laminate film that is a battery exterior material. The stacked type allows the battery to be made compact and have a high capacity.

[0012] However, the unit cell layer 9 housed in the all-solid-state battery 100 to which the present invention is applied does not necessarily have to be a multi-layer structure, and may be a single layer. The unit cell layer 9 is configured, for example, in a rectangular sheet shape before being housed in a battery exterior material. The appearance and the internal electrical connection state (electrode structure) of the all-solid-state battery 100 of this embodiment are not particularly limited.

[0013] The appearance of the all-solid-state battery 100 may be, for example, a rectangular flattened angular shape, or a circular or elliptical shape. Alternatively, it may be a cylindrical type in which a single-layer or multiple-layered cell layer 9 is wound and housed. In addition, the electrode structure of the all-solid-state battery 100 may be either a so-called non-bipolar type (internal parallel connection type) or a bipolar type (internal series connection type). In other words, the aspects of the all-solid-state battery 100 other than the configuration of the cell layer 9 described below are not particularly limited, regardless of whether they are publicly known or not.

[0014] The single cell layer 9 includes a positive electrode current collector 1 (second current collector), a negative electrode current collector 2 (first current collector), a positive electrode active material layer 3 (the other electrode), a negative electrode active material layer 4 (one electrode), and a solid electrolyte layer 5.

[0015] More specifically, the single cell layer 9 includes a positive electrode having a structure in which a positive electrode active material layer 3 containing a positive electrode active material is disposed on the surface of a positive electrode current collector 1, and a negative electrode having a structure in which a negative electrode active material layer 4 containing a negative electrode active material is disposed on the surface of a negative electrode current collector 2, and further includes a solid electrolyte layer 5 between the positive electrode and the negative electrode. Details of each component of the all-solid-state battery 100 will be described later.

[0016] Here, the problem solved by the all-solid-state battery 100 of this embodiment will be described with reference to Fig. 3 showing the structure of an all-solid-state battery of a comparative example. Note that the words indicating the up-down direction used in the following description are expressions that correspond to the up-down direction in the figure, and are not necessarily intended to correspond to the up-down direction in the actual direction of gravity.

[0017] 3 is a diagram showing pressure applied to a cell layer 9A included in a comparative example of an all-solid-state battery 100. The cell layer 9A of the comparative example is configured, for example, in a rectangular sheet shape before being housed in a battery exterior material, and the cross-sectional view shown in the figure is a cross-sectional view including one side that constitutes the periphery of the rectangle.

[0018] In the unit cell layer 9A, a positive electrode active material layer 3 and a ring-shaped insulating film 7 are disposed on a positive electrode current collector 1 so as to surround the periphery of the positive electrode active material. The positive electrode active material layer 3 has a tapered shape in which the outer circumferential edge 31 has a cross-sectional area that decreases the further away from the positive electrode current collector 1 in the thickness direction, and the outer circumferential edge 32 has an inclined surface 32a that is inclined in the direction away from the positive electrode current collector 1. Therefore, a periphery 321 (edge) is formed at the boundary between the outer circumferential edge 32 of the positive electrode active material layer 3 and the region inside it.

[0019] A solid electrolyte layer 5 is disposed on the positive electrode active material layer 3 and the insulating film 7, a negative electrode active material layer 4 is disposed on the solid electrolyte layer 5, and a negative electrode current collector 2 is disposed on the negative electrode active material layer 4.

[0020] The solid electrolyte layer 5 and the negative electrode active material layer 4 have a tapered shape in which the cross-sectional area decreases with increasing distance from the positive electrode current collector 1 in the thickness direction, and the outer peripheral end 52 of the solid electrolyte layer 5 forms an inclined surface 52a, and the outer peripheral end 42 of the negative electrode active material layer 4 also forms an inclined surface 42a. The inclined surface 42a of the negative electrode active material layer 4 is spaced from the negative electrode current collector 2.

[0021] Moreover, the solid electrolyte layer 5 is disposed so as to fill the gap between the insulating film 7 and the positive electrode active material layer 3 (the inclined surface 32a).

[0022] In the comparative example, even if pressure is applied to the cell layer 9A in its thickness direction, the outer peripheral end 42 (inclined surface 42a) does not directly receive a pressing force from the negative electrode current collector 2, and the outer peripheral end 42 is unlikely to deform. Furthermore, in the comparative example, even if the outer peripheral end 42 deforms and begins to crumble, the negative electrode active material remains on the surface of the solid electrolyte layer 5 (inclined surface 52a) or the insulating film 7, and the risk of a short circuit with the positive electrode active material layer 3 or the positive electrode current collector 1 can be reduced.

[0023] However, in the comparative example, the solid electrolyte layer 5 is in contact with the negative electrode current collector 2 at a position overlapping the edge 321 of the negative electrode active material layer 4 in a plan view.

[0024] Therefore, when the cell layer 9A is pressed in the thickness direction, the edge 321 is also pressed. At this time, stress is concentrated in a portion (encircled by a dashed line in the figure) where the edge 321 contacts the edge 321 of the solid electrolyte layer 5, and damage may progress from that portion, causing a short circuit between the negative electrode active material layer 4 and the positive electrode active material layer 3. In the pressure bonding process of the all-solid-state battery 100, the pressure applied is higher than that of a lithium-ion battery having a liquid electrolyte, so that that portion is particularly susceptible to damage.

[0025] Therefore, the present invention is provided with a configuration for reducing the stress concentration on the solid electrolyte layer 5 during pressure bonding as described above. Hereinafter, the details of the configuration of the all-solid-state battery 100 will be described again with reference to FIG.

[0026] As shown in FIG. 1, in a unit cell layer 9 included in an all-solid-state battery 100 of this embodiment, a positive electrode active material layer 3, a solid electrolyte layer 5, and a negative electrode active material layer 4 have shapes different from one another.

[0027] For example, the solid electrolyte layer 5 has an area larger than those of the positive electrode active material layer 3 and the negative electrode active material layer 4, and is disposed such that its outer circumferential edge 51 is located outside the outer circumferential edge 31 of the positive electrode active material layer 3 and the outer circumferential edge 41 of the negative electrode active material layer 4 in a plan view.

[0028] In addition, the negative electrode active material layer 4 has a tapered shape in which the cross-sectional area decreases with increasing distance from the solid electrolyte layer 5 in the thickness direction, and the outer peripheral end portion 41 has an inclined surface 41a inclined toward the negative electrode current collector 2 (inclined in the direction away from the solid electrolyte layer 5), and the edge 411 of the outer peripheral end portion 41 on the solid electrolyte layer 5 side forms an edge.

[0029] In the first embodiment, the positive electrode active material layer 3 does not need to have a tapered outer circumferential edge 31 like the negative electrode active material layer 4.

[0030] FIG. 2 is a diagram showing pressure applied to the unit cell layer 9 included in the all-solid-state battery 100 of the first embodiment.

[0031] As shown in FIG. 2, a gap 61 is formed between the outer peripheral end 41 (inclined surface 41a) of the negative electrode active material layer 4 and the negative electrode current collector 2, as surrounded by a triangle by a dashed line, and the outer peripheral end 41 is not in contact with the negative electrode current collector 2.

[0032] For this reason, even if the cell layer 9 is pressed from the thickness direction (the direction indicated by the vertical arrow in Figure 2), the pressing force (load) from the negative electrode current collector 2 is not directly applied to the outer peripheral end portion 41 (inclined surface 41a) of the negative electrode active material layer 4.

[0033] In addition, at the position contacting the edge 311 (edge) of the solid electrolyte layer 5, a pressing force is applied from the thickness direction via the negative electrode current collector 2 and the negative electrode active material layer 4, and a pressing force is applied via the positive electrode current collector 1 and the positive electrode active material layer 3, which may cause stress concentration.

[0034] However, edge 311 (edge) of outer circumferential end 31 of positive electrode active material layer 3 on the solid electrolyte layer 5 side (contact position with solid electrolyte layer 5) is located at a position overlapping outer circumferential end 41 of negative electrode active material layer 4 in plan view, more specifically, located at a position between edge 411 of outer circumferential end 41 on the solid electrolyte layer 5 side and edge 412 of outer circumferential end 41 of negative electrode active material layer 4 on the negative electrode current collector 2 side in plan view. That is, as shown in FIG. 2 (FIG. 1), edge 311 (edge) is located in the range surrounded by two dashed straight lines in the figure (the range indicated by the horizontal arrow in FIG. 2).

[0035] As a result, a pressing force is not directly applied to the edge 311 (edge) from the thickness direction via the negative electrode current collector 2 and the negative electrode active material layer 4. As a result, no stress concentration due to the pressing force occurs at the position of contact with the edge 311 (edge) of the solid electrolyte layer 5. This makes it possible to reduce the pressing force on the edge 311 (edge) and the stress concentration at the position of contact with the edge 311 (edge) of the solid electrolyte layer 5, thereby reducing deformation and collapse of the solid electrolyte layer 5 and preventing a short circuit between the negative electrode active material layer 4 and the positive electrode active material layer 3.

[0036] Incidentally, outer peripheral edge 41 receives stress in a direction from the portion of negative electrode active material layer 4 that contacts negative electrode current collector 2 toward solid electrolyte layer 5, and this stress can become a pressing force (load) against solid electrolyte layer 5.

[0037] However, in the first embodiment, the solid electrolyte layer 5 is disposed so as to protrude and be exposed from the outer peripheral end 41 of the negative electrode active material layer 4 in a plan view. Therefore, the pressing force applied to the outer peripheral end 41 can be dispersed toward the outer peripheral end 51 of the solid electrolyte layer 5, as shown by the diagonal arrow in Fig. 2, and the pressing force (load) toward the positive electrode active material layer 3 can be reduced.

[0038] Therefore, the pressing force applied to the edge 311 is extremely small, and the pressing force applied to the edge 311 and the stress concentration on the portion of the solid electrolyte layer 5 in contact with the edge 311 can be further reduced. Therefore, a short circuit between the negative electrode active material layer 4 and the positive electrode active material layer 3 can be avoided.

[0039] In addition, when the edge 311 (edge) of the outer peripheral end 31 of the positive electrode active material layer 3 is disposed at a position inside the outer peripheral end 41 of the negative electrode active material layer 4 in a plan view, there is a risk of stress being concentrated at a position contacting the edge 311 (edge) of the solid electrolyte layer 5. On the other hand, when the edge 311 (edge) is disposed outside the outer peripheral end 41 of the negative electrode active material layer 4 in a plan view, the pressing force is not applied to the edge 311 (edge) via the negative electrode current collector 2 and the negative electrode active material layer 4. However, the pressing force is applied to the edge 411 of the positive electrode active material layer 3 on the solid electrolyte layer 5 side via the positive electrode current collector 1, the positive electrode active material layer 3, and the solid electrolyte layer 5, but the vicinity of the edge 411 has a small thickness and a small strength. Therefore, the edge 411 may be deformed by the pressing force and may be damaged by repeatedly receiving the pressing force.

[0040] Therefore, it is preferable that the edge 311 (edge) of the outer circumferential end 31 of the positive electrode active material layer 3 on the solid electrolyte layer 5 side be disposed between the edge 412 of the outer circumferential end 41 of the negative electrode active material layer 4 on the negative electrode current collector 2 side and the edge 411 of the outer circumferential end 41 on the solid electrolyte layer 5 side in a plan view.

[0041] Incidentally, in the present invention, a configuration in which the shapes of the negative electrode active material layer 4 and the positive electrode active material layer 3 are interchanged can also be applied (see the symbols in parentheses in Figs. 1 and 2). That is, the positive electrode active material layer 3 has a tapered shape in which the cross-sectional area becomes smaller as it moves away from the solid electrolyte layer 5 in the thickness direction, and the outer peripheral end 31 has an inclined surface 31a inclined toward the positive electrode current collector 1 (inclined in the direction away from the solid electrolyte layer 5). A configuration can also be applied in which the edge 411 on the solid electrolyte layer 5 side of the outer peripheral end 41 of the negative electrode active material layer 4 is disposed between the edge 312 on the positive electrode current collector 1 side of the outer peripheral end 31 of the positive electrode active material layer 3 and the edge 311 on the solid electrolyte layer 5 side of the outer peripheral end 31 in a plan view.

[0042] However, since the effect of the invention is the same when the shapes of the negative electrode active material layer 4 and the positive electrode active material layer 3 are interchanged, a description thereof will be omitted in the following embodiments.

[0043] [Modification of the first embodiment] Fig. 4 is a cross-sectional view illustrating the cell layer 9 included in the all-solid-state battery 100 of the first modified example of the first embodiment. Fig. 5 is a cross-sectional view illustrating the cell layer 9 included in the all-solid-state battery 100 of the second modified example of the first embodiment. Fig. 6 is a cross-sectional view illustrating the cell layer 9 included in the all-solid-state battery 100 of the third modified example of the first embodiment. In all of the first modified example, the second modified example, and the third modified example of the first embodiment, the outer peripheral end 41 of the negative electrode active material layer 4 has a shape that is generally inclined toward the negative electrode current collector 2 side, and have the same effects as the first embodiment.

[0044] As shown in FIG. 4, in the first modified example, the negative electrode active material layer 4 has a tapered shape in which the cross-sectional area decreases with increasing distance from the solid electrolyte layer 5 in the thickness direction, and an inclined surface 41a inclined toward the negative electrode current collector 2 is formed at the outer circumferential end 41, while an edge 411 of the outer circumferential end 41 on the solid electrolyte layer 5 side forms an end face of a constant thickness.

[0045] 5, in the second modification, the negative electrode active material layer 4 has a shape in which the cross-sectional area decreases stepwise with increasing distance from the solid electrolyte layer 5 in the thickness direction, and the outer peripheral edge 41 has a stepped shape. Although the step has one step in FIG. 5, the step may be formed with two or more steps.

[0046] As shown in FIG. 6, in the third modified example, the negative electrode active material layer 4 has a tapered shape in which the cross-sectional area decreases with increasing distance from the solid electrolyte layer 5 in the thickness direction, and an inclined surface 41a inclined toward the negative electrode current collector 2 is formed at the outer circumferential end 41, but the inclined surface 41a is not flat but has a convex curved shape.

[0047] [Second embodiment] 7 is a diagram showing pressure applied to the cell layer 9 included in the all-solid-state battery 100 of the second embodiment. The cell layer 9 of the second embodiment is disposed such that the solid electrolyte layer 5 is located inside the negative electrode active material layer 4 and outside the positive electrode active material layer 3 in a plan view.

[0048] As described above, the outer peripheral end 41 of the negative electrode active material layer 4 receives stress from the portion of the negative electrode active material layer 4 that contacts the negative electrode current collector 2, and this stress can be applied as a pressing force to the solid electrolyte layer 5. However, for example, when the flexibility of the negative electrode active material layer 4 is high and the stress is small, the pressing force applied by the outer peripheral end 41 to the solid electrolyte layer 5 also becomes small. In this case, since it is not necessary to disperse the pressing force by the solid electrolyte layer 5, the solid electrolyte layer 5 may have a shape recessed from the outer peripheral end 41 as shown in FIG. 7.

[0049] Also in the second embodiment, the edge 311 (edge) of the outer circumferential end 31 of the positive electrode active material layer 3 on the solid electrolyte layer 5 side is disposed between the edge 411 of the outer circumferential end 41 on the solid electrolyte layer 5 side and the edge 412 of the outer circumferential end 41 of the negative electrode active material layer 4 on the negative electrode current collector 2 side in a plan view (see FIG. 2).

[0050] Therefore, the pressing force applied to the edge 311 (edge) of the outer circumferential end 31 of the positive electrode active material layer 3 on the solid electrolyte layer 5 side is reduced, thereby providing a common effect with the first embodiment in that stress concentration at the contact position with the edge 311 (edge) of the solid electrolyte layer 5 is reduced.

[0051] [Modification of the second embodiment] Fig. 8 is a cross-sectional view illustrating the unit cell layer 9 included in the all-solid-state battery 100 of the first modified example of the second embodiment. Fig. 9 is a cross-sectional view illustrating the unit cell layer 9 included in the all-solid-state battery 100 of the second modified example of the second embodiment. Fig. 10 is a cross-sectional view illustrating the unit cell layer 9 included in the all-solid-state battery 100 of the third modified example of the second embodiment.

[0052] As shown in FIG. 8, in the first modified example, the negative electrode active material layer 4 has a tapered shape in which the cross-sectional area decreases with increasing distance from the solid electrolyte layer 5 in the thickness direction, and an inclined surface 41a inclined toward the negative electrode current collector 2 is formed at the outer circumferential end 41, while an edge 411 of the outer circumferential end 41 on the solid electrolyte layer 5 side forms an end face of a constant thickness.

[0053] 9, in the second modification, the negative electrode active material layer 4 has a shape in which the cross-sectional area decreases stepwise with increasing distance from the solid electrolyte layer 5 in the thickness direction, and the outer peripheral edge 41 has a stepped shape. Although the step has one step in FIG. 9, the step may be formed with two or more steps.

[0054] As shown in FIG. 10 , in the third modified example, the negative electrode active material layer 4 has a tapered shape in which the cross-sectional area decreases with increasing distance from the solid electrolyte layer 5 in the thickness direction, and an inclined surface 41a inclined toward the negative electrode current collector 2 is formed at the outer circumferential end 41, but the inclined surface 41a is not flat but has a convex curved shape.

[0055] [Third embodiment] 11 is a cross-sectional view illustrating a cell layer 9 included in an all-solid-state battery 100 according to the third embodiment. In addition to the configuration of the first embodiment, the cell layer 9 according to the third embodiment has a tapered shape in which the cross-sectional area of ​​the positive electrode active material layer 3 decreases as it moves away from the solid electrolyte layer 5. The outer peripheral end 31 of the positive electrode active material layer 3 forms an inclined surface 31a inclined toward the positive electrode current collector 1 side.

[0056] Also in the third embodiment, the edge 311 (edge) of the outer circumferential end 31 of the positive electrode active material layer 3 on the solid electrolyte layer 5 side is disposed between the edge 412 of the outer circumferential end 41 of the negative electrode active material layer 4 on the negative electrode current collector 2 side and the edge 411 of the outer circumferential end 41 on the solid electrolyte layer 5 side in a plan view (see FIGS. 2 and 7).

[0057] 11, edge 312 of outer circumferential end 31 of positive electrode active material layer 3 on the positive electrode current collector 1 side is disposed at a position more inward than outer circumferential end 41 of negative electrode active material layer 4 in plan view. Edge 312 may be disposed between edge 412 of outer circumferential end 41 of negative electrode active material layer 4 on the negative electrode current collector 2 side and edge 411 of outer circumferential end 41 on the solid electrolyte layer 5 side in plan view.

[0058] As shown in FIG. 11, in the third embodiment, a gap 61 is formed by the inclined surface 41a of the outer peripheral end 41 of the negative electrode active material layer 4, and a gap 62 shown by a dashed line is further formed by the inclined surface 31a of the outer peripheral end 31 of the positive electrode active material layer 3.

[0059] As a result, the outer peripheral end 31 of the positive electrode active material layer 3 does not directly receive a pressing force from the positive electrode current collector 1. The outer peripheral end 31 receives stress from the portion of the positive electrode active material layer 3 in contact with the positive electrode current collector 1 toward the solid electrolyte layer 5, and the pressing force due to the stress can be applied to the solid electrolyte layer 5, but the pressing force is dispersed in the solid electrolyte layer 5 as in the case shown in FIG. 2. Therefore, in the solid electrolyte layer 5, the pressing force is dispersed not only from the outer peripheral end 41 of the negative electrode active material layer 4 as in the first embodiment, but also from the outer peripheral end 31 of the positive electrode active material layer 3, so that the stress concentration on the solid electrolyte layer 5 can be further reduced. Therefore, the deformation and collapse of the solid electrolyte layer 5 can be reduced, and a short circuit between the negative electrode active material layer 4 and the positive electrode active material layer 3 through the solid electrolyte layer 5 can be avoided.

[0060] [Electrode cutting process] FIG. 12 is a diagram illustrating the process of cutting off the ends of the electrodes.

[0061] The outer periphery 31 of the positive electrode active material layer 3 and the outer periphery 41 of the negative electrode active material layer 4 can be formed by a cutting step as shown in FIG.

[0062] As shown in FIG. 12(a), an electrode material 81 that is to be a material for electrodes (positive electrode active material layer 3, negative electrode active material layer 4) is fixed to a holder 82 and arranged so that the electrode material 81 covers an edge 82a of the holder 82 in a plan view. Then, a blade 83 is moved toward the edge 82a at a predetermined inclination angle, and the electrode material 81 is cut by cutting the blade 83 into the electrode material 81 as shown in FIG. 12(b). As a result, an inclined surface 81a is formed at the outer peripheral end of the electrode material 81 fixed to the holder 82 as shown in FIG. 12(c). When the electrode material 81 is rectangular, the blade 83 is caused to cut all four sides to form the inclined surfaces 81a.

[0063] Therefore, by forming in advance the inclined surface 31a (inclined surface 81a) on the outer peripheral end 31 of the positive electrode active material layer 3 and / or forming in advance the inclined surface 41a (inclined surface 81a) on the outer peripheral end 41 of the negative electrode active material layer 4, and applying pressure treatment to a laminated structure in which the positive electrode current collector 1, the positive electrode active material layer 3, the solid electrolyte layer 5, the negative electrode active material layer 4, and the negative electrode current collector 2 are laminated in this order, from the thickness direction, the single cell layer 9 constituting the all-solid-state battery 100 of this embodiment can be manufactured.

[0064] [Effects of this embodiment] The all-solid-state battery 100 of this embodiment includes a solid electrolyte layer 5, one electrode (e.g., anode active material layer 4) and another electrode (e.g., cathode active material layer 3) sandwiching the solid electrolyte layer 5, and a first current collector (e.g., anode current collector 2) sandwiching the one electrode (anode active material layer 4) together with the solid electrolyte layer 5, wherein an end (outer peripheral end 41) of the one electrode (anode active material layer 4) is inclined (has an inclined surface 41a) toward the first current collector (anode current collector 2), and an edge 311 on the solid electrolyte layer 5 side of an end (outer peripheral end 31) of the other electrode (cathode active material layer 3) is disposed between an edge 411 on the solid electrolyte layer 5 side of the end (outer peripheral end 41) of the one electrode (anode active material layer 4) and an edge 412 on the first current collector (anode current collector 2) side of the end (outer peripheral end 41) of the one electrode (anode active material layer 4) in a plan view.

[0065] With the above-described configuration, a gap 61 is formed between the end (outer peripheral end 41) (inclined surface 41a) of one electrode (negative electrode active material layer 4) and the first current collector (negative electrode current collector 2) so as to be surrounded by a triangle by the dashed lines in Figures 1 and 2, and the end (outer peripheral end 41) is not in contact with the one electrode (negative electrode current collector 2).

[0066] For this reason, even if the cell layer 9 including the other electrode (positive electrode active material layer 3), solid electrolyte layer 5, one electrode (negative electrode active material layer 4), and first current collector (negative electrode current collector 2) is pressed in the thickness direction (the direction shown by the arrow in FIG. 2), the pressing force (load) from the one electrode (negative electrode current collector 2) is not directly applied to the end (outer peripheral end 41) (inclined surface 41a) of the one electrode (negative electrode active material layer 4).

[0067] In addition, at a position where the solid electrolyte layer 5 comes into contact with the edge 311 (edge) of the end (outer peripheral end 31) of the other electrode (cathode active material layer 3), a pressing force is applied from the thickness direction via the first current collector (negative electrode current collector 2) and one electrode (negative electrode active material layer 4), and a pressing force is also applied via a second current collector (cathode current collector 1) and the other electrode (cathode active material layer 3) described below, which may cause stress concentration.

[0068] However, the edge 311 (edge) of the end (outer peripheral end 31) of the other electrode (cathode active material layer 3) on the solid electrolyte layer 5 side is located at a position between the edge 411 of the end (outer peripheral end 41) of one electrode (negative electrode active material layer 4) on the solid electrolyte layer 5 side and the edge 412 of the end (outer peripheral end 41) of one electrode (negative electrode active material layer 4) on the one electrode (negative electrode current collector 2) side in a plan view.

[0069] As a result, a pressing force is not directly applied to the edge 311 (edge) from the thickness direction via the first current collector (negative electrode current collector 2) and one electrode (negative electrode active material layer 4). As a result, no stress concentration due to the pressing force occurs at the position of the solid electrolyte layer 5 that contacts the edge 311 (edge). This makes it possible to reduce the pressing force on the edge 311 (edge) and the stress concentration at the position of the solid electrolyte layer 5 that contacts the edge 311 (edge), thereby reducing deformation and collapse of the solid electrolyte layer 5 and preventing a short circuit between one electrode (negative electrode active material layer 4) and the other electrode (positive electrode active material layer 3).

[0070] In this embodiment, the end (outer peripheral end 51) of the solid electrolyte layer 15 is exposed from the end (outer peripheral end 31) of one electrode (negative electrode active material layer 4) and the end (outer peripheral end 41) of the other electrode (positive electrode active material layer 3) in a plan view.

[0071] With regard to the above configuration, the end (outer peripheral end 41) of one electrode (negative electrode active material layer 4) receives stress in a direction from the portion of the one electrode (negative electrode active material layer 4) that contacts the first current collector (negative electrode current collector 2) toward the solid electrolyte layer 5, and this stress can become a pressing force (load) against the solid electrolyte layer 5.

[0072] However, with the above-mentioned configuration, the solid electrolyte layer 5 is arranged to protrude so as to be exposed from the end (outer peripheral end 41) of one electrode (negative electrode active material layer 4) in a plan view. Therefore, the pressing force applied to the outer peripheral end 41 can be dispersed toward the outer peripheral end 51 of the solid electrolyte layer 5 as shown by the arrow in Fig. 2, and the pressing force (load) toward the positive electrode active material layer 3 can be reduced.

[0073] Therefore, the pressing force applied to the edge 311 (edge) becomes extremely small, and it is possible to further reduce the pressing force on the edge 311 (edge) and the stress concentration on the portion of the solid electrolyte layer 5 that contacts the edge 311. Therefore, it is possible to avoid a short circuit between one electrode (negative electrode active material layer 4) and the other electrode (positive electrode active material layer 3).

[0074] In this embodiment, the battery includes a second current collector (cathode current collector 1) that sandwiches the other electrode (cathode active material layer 3) together with the solid electrolyte layer 5, and an end (outer peripheral end 31) of the other electrode (cathode active material layer 3) is inclined toward the second current collector (cathode current collector 1).

[0075] With the above configuration, the end (outer peripheral end 31) of the other electrode (cathode active material layer 3) does not directly receive a pressing force from the second current collector (cathode current collector 1). The end (outer peripheral end 31) receives stress from the portion of the other electrode (cathode active material layer 3) that contacts the second current collector (cathode current collector 1) toward the solid electrolyte layer 5, and the pressing force due to the stress can be applied to the solid electrolyte layer 5, but the pressing force is dispersed in the solid electrolyte layer 5 as in the case shown in FIG. 2. Therefore, in the solid electrolyte layer 5, the pressing force is dispersed not only from the end (outer peripheral end 41) of one electrode (negative active material layer 4) as described above, but also from the end (outer peripheral end 31) of the other electrode (cathode active material layer 3), so that the stress concentration on the solid electrolyte layer 5 can be further reduced. Therefore, deformation and collapse of the solid electrolyte layer 5 can be reduced, and a short circuit between one electrode (negative electrode active material layer 4) and the other electrode (positive electrode active material layer 3) through the solid electrolyte layer 5 can be avoided.

[0076] In this embodiment, the electrode includes a second current collector (cathode current collector 1) which, together with the solid electrolyte layer 5, sandwiches the other electrode (cathode active material layer 3), and the area of ​​contact between the one electrode (negative electrode active material layer 4) and the solid electrolyte layer 5 is set to be larger than the area of ​​contact between the one electrode (negative electrode active material layer 4) and the first current collector (negative electrode current collector 2), and the area of ​​contact between the other electrode (cathode active material layer 3) and the solid electrolyte layer 5 is set to be larger than the area of ​​contact between the other electrode (cathode active material layer 3) and the second current collector (cathode current collector 1).

[0077] This makes it possible to easily construct a configuration (cell layer 9) that exhibits the unique effects of the present invention.

[0078] Moreover, according to the manufacturing method of the all-solid-state battery 100 of this embodiment, the preformed electrode material 81 is cut to form an electrode (e.g., negative electrode active material layer 4) having an end (e.g., outer peripheral end 41), and the electrode (negative electrode active material layer 4) is sandwiched between the solid electrolyte layer 5 and the first current collector (negative electrode current collector 2) and pressurized to form. In this way, the inclined surface 41a of the electrode (negative electrode active material layer 4) or the inclined surface 31a of the electrode (positive electrode active material layer 3) can be formed in a simple manner, and the unit cell layer 9 can be formed.

[0079] The main components of the cell layer 9 constituting the all-solid-state battery 100 according to this embodiment will be described below.

[0080] [Current collector] The material constituting the positive electrode current collector 1 and the negative electrode current collector 2 (hereinafter collectively referred to as current collectors) is not particularly limited as long as it functions as a current collector applicable to the all-solid-state battery 100 in the technical field related to the present invention. As the material constituting the current collectors, a known material may be adopted, and for example, a metal or a resin having electrical conductivity may be adopted.

[0081] [Negative electrode active material layer] The negative electrode active material layer 4 contains a negative electrode active material. The type of the negative electrode active material is not particularly limited, but may be a carbon material, a metal oxide, or a metal active material. Examples of the carbon material include natural graphite, artificial graphite, mesocarbon microbeads (MCMB), highly oriented graphite (HOPG), hard carbon, and soft carbon. Examples of the metal oxide include Nb2O5, Li4Ti5O 12 Examples include. Furthermore, silicon-based negative electrode active materials and tin-based negative electrode active materials may be used. Here, silicon and tin belong to the 14th group of elements, and are known to be negative electrode active materials that can greatly improve the capacity of non-aqueous electrolyte secondary batteries. These simple substances can absorb and release a large number of charge carriers (lithium ions, etc.) per unit volume (mass), and therefore become high-capacity negative electrode active materials. Here, as the silicon-based negative electrode active material, it is preferable to use simple Si. Similarly, it is also preferable to use silicon oxide such as SiOx (0.3≦x≦1.6) disproportionated into two phases of a Si phase and a silicon oxide phase. In this case, the range of x is more preferably 0.5≦x≦1.5, and even more preferably 0.7≦x≦1.2. Furthermore, an alloy containing silicon (silicon-containing alloy-based negative electrode active material) may be used. On the other hand, examples of negative electrode active materials containing tin (tin-based negative electrode active materials) include simple Sn, tin alloys (Cu-Sn alloys, Co-Sn alloys), amorphous tin oxides, and tin silicon oxides. Among these, the amorphous tin oxides include SnB 0.4 P 0.6 O 3.1Examples of the tin silicon oxide include SnSiO3. Metals containing lithium (Li) may be used as the negative electrode active material. Such negative electrode active materials are not particularly limited as long as they are active materials containing lithium, and examples thereof include metallic lithium and lithium-containing alloys. Examples of the lithium-containing alloys include alloys of Li and at least one of In, Al, Si and Sn. In some cases, two or more negative electrode active materials may be used in combination. Of course, negative electrode active materials other than the above may be used. In terms of high capacity, the negative electrode active material preferably contains metallic lithium, a silicon-based negative electrode active material or a tin-based negative electrode active material, and particularly preferably contains metallic lithium.

[0082] The shape of the negative electrode active material may be, for example, particulate (spherical, fibrous), thin film, etc. When the negative electrode active material is particulate, the average particle size (D50) is, for example, preferably within the range of 1 nm to 100 μm, more preferably within the range of 10 nm to 50 μm, even more preferably within the range of 100 nm to 20 μm, and particularly preferably within the range of 1 to 20 μm. In this specification, the average particle size (D50) of the active material can be measured by a laser diffraction scattering method.

[0083] The content of the negative electrode active material in the negative electrode active material layer 4 is not particularly limited, but is preferably within the range of 40 to 99 mass %, and more preferably within the range of 50 to 90 mass %, for example.

[0084] The negative electrode active material layer 4 preferably further contains a solid electrolyte. When the negative electrode active material layer 4 contains a solid electrolyte, the ion conductivity of the negative electrode active material layer 4 can be improved. Examples of the solid electrolyte include sulfide solid electrolytes and oxide solid electrolytes, and the sulfide solid electrolyte is preferable.

[0085] Examples of sulfide solid electrolytes include LiI-Li2S-SiS2, LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li2S-P2S5, LiI-Li3PS4, LiI-LiBr-Li3PS4, Li3PS4, Li2S-P2S5, Li2S-P2S5-LiI, Li2S-P2S5-Li2O, Li2S-P2S5-Li2OLiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, and Li2S-SiS2-LiC. l , Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, Li2S-P2S5-Z m S n (however, m , n is a positive number, and Z is Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li x MO y (however, x , y is a positive number, and M is any of P, Si, Ge, B, Al, Ga, and In. The description "Li2S-P2S5" means a sulfide solid electrolyte obtained by using a raw material composition containing Li2S and P2S5, and the same applies to other descriptions.

[0086] The sulfide solid electrolyte may have, for example, a Li3PS4 skeleton, a Li4P2S7 skeleton, or a Li4P2S6 skeleton. Examples of sulfide solid electrolytes having a Li3PS4 skeleton include LiI-Li3PS4, LiI-LiBr-Li3PS4, and Li3PS4. Examples of sulfide solid electrolytes having a Li4P2S7 skeleton include Li-PS solid electrolytes called LPS (for example, Li7P3S 11 ) As the sulfide solid electrolyte, for example, Li (4-x) Ge (1-x) P x S4( xFor example, an LGPS or the like represented by 0 < x < 1 may be used. Among them, the sulfide solid electrolyte is preferably a sulfide solid electrolyte containing P element, and more preferably a material mainly composed of Li2S-P2S5. Further, the sulfide solid electrolyte may contain a halogen (F, Cl, Br, I).

[0087] When the sulfide solid electrolyte is of the Li2S-P2S5 system, the ratio of Li2S and P2S5 is preferably in the range of Li2S:P2S5 = 50:50 to 100:0 in terms of molar ratio, and more preferably Li2S:P2S5 = 70:30 to 80:20.

[0088] The sulfide solid electrolyte may be a sulfide glass, a crystallized sulfide glass, or a crystalline material obtained by a solid-phase method. The sulfide glass can be obtained, for example, by performing mechanical milling (such as a ball mill) on a raw material composition. The crystallized sulfide glass can be obtained, for example, by performing heat treatment on the sulfide glass at a temperature above the crystallization temperature. The ionic conductivity (e.g., Li ion conductivity) of the sulfide solid electrolyte at room temperature (25 °C) is, for example, 1×10 -5 S / cm or more, and more preferably 1×10 -4 S / cm or more. The value of the ionic conductivity of the solid electrolyte can be measured by an alternating current impedance method.

[0089] Examples of the oxide solid electrolyte include compounds having a NASICON-type structure. As an example of a compound having a NASICON-type structure, a compound represented by the general formula Li 1+x AlxG e2-x (PO4)3 (0 ≤ x ≤ 2) (LAGP), a compound represented by the general formula Li 1+x A lx Ti 2-x (PO4)3 (0 ≤ x ≤ 2) (LATP), etc. are included. As another example of the oxide solid electrolyte, LiLaTiO (for example, Li 0.3 4La 0.51TiO3), LiPON (e.g., Li2.9PO3.3N 0.46 ), LiLaZrO (e.g., Li7La3Zr2O 12 ) etc.

[0090] The shape of the solid electrolyte may be, for example, a particulate shape such as a perfect sphere or an oval sphere, or a thin film shape. When the solid electrolyte is particulate, its average particle size (D50) is not particularly limited, but is preferably 40 μm or less, more preferably 20 μm or less, and even more preferably 10 μm or less. On the other hand, the average particle size (D50) is preferably 0.01 μm or more, and more preferably 0.1 μm or more.

[0091] The content of the solid electrolyte in the negative electrode active material layer 4 is, for example, preferably in the range of 1 to 60 mass %, and more preferably in the range of 10 to 50 mass %. However, when lithium metal is used as the negative electrode active material constituting the negative electrode active material layer 4, the content of the solid electrolyte in the negative electrode active material layer 4 is preferably zero. Note that examples of the form of the lithium metal used here include lithium metal foil, lithium alloy metal foil (alloy type is Mg, Al, In, etc.), and lithium evaporated on a substrate (substrate is SUS foil, Al foil, etc.).

[0092] The negative electrode active material layer 4 may further contain at least one of a conductive assistant and a binder, in addition to the above-mentioned negative electrode active material and solid electrolyte.

[0093] Examples of the conductive assistant include metals such as aluminum, stainless steel (SUS), silver, gold, copper, and titanium, and alloys or metal oxides containing these metals; carbon fibers (specifically, vapor grown carbon fibers (VGCF), polyacrylonitrile-based carbon fibers, pitch-based carbon fibers, rayon-based carbon fibers, activated carbon fibers, etc.), carbon nanotubes (CNTs), and carbon black (specifically, acetylene black, Ketjen Black (registered trademark), furnace black, channel black, thermal lamp black, etc.), but are not limited to these.

[0094] Furthermore, the material used as the binder is not particularly limited, and any material known in the art that functions as a binder applicable to the all-solid-state battery 100 may be used.

[0095] The thickness of the negative electrode active material layer 4 differs depending on the intended configuration of the all-solid-state battery 100, but is preferably within the range of, for example, 0.1 to 1000 μm.

[0096] [Cathode active material layer] The positive electrode active material layer 3 preferably contains a positive electrode active material containing sulfur. The type of the positive electrode active material containing sulfur is not particularly limited, but may be, in addition to sulfur element (S), particles or thin films of organic sulfur compounds or inorganic sulfur compounds, and may be any material that can release lithium ions during charging and absorb lithium ions during discharging by utilizing the oxidation-reduction reaction of sulfur. Examples of the organic sulfur compound include disulfide compounds, sulfur-modified polyacrylonitrile, sulfur-modified polyisoprene, rubeanic acid (dithiooxamide), polycarbonate sulfide, etc., as typified by the compounds described in the pamphlet of International Publication No. 2010 / 044437. Among them, disulfide compounds, sulfur-modified polyacrylonitrile, and rubeanic acid are preferred, and sulfur-modified polyacrylonitrile is particularly preferred. As the disulfide compound, a dithiobiurea derivative, a compound having a thiourea group, a thioisocyanate, or a thioamide group is more preferred. Here, the sulfur-modified polyacrylonitrile is a modified polyacrylonitrile containing sulfur atoms, which is obtained by mixing sulfur powder with polyacrylonitrile and heating the mixture under an inert gas or under reduced pressure. Its estimated structure is, for example, as shown in Chem. Mater. 2011, 23, 5024-5028, in which polyacrylonitrile is ring-closed to form a polycyclic ring, and at least a part of S is bonded to C. The compound described in this document has a peak at 1330 cm in the Raman spectrum. -1 and 1560cm -1 There is a strong peak signal near 307 cm -1 , 379cm-1 , 472cm -1 , 929cm -1 There is a peak around 1000 nm. On the other hand, inorganic sulfur compounds are preferred because of their excellent stability, and specific examples thereof include sulfur element (S), S-carbon composite, TiS2, TiS3, TiS4, NiS, NiS2, CuS, FeS2, Li2S, MoS2, MoS3, and the like. Among them, S, S-carbon composite, TiS2, TiS3, TiS4, FeS2, and MoS2 are preferred, sulfur element (S), S-carbon composite, TiS2, and FeS2 are more preferred, and sulfur element (S) is particularly preferred. Here, the S-carbon composite is a composite state that contains sulfur powder and a carbon material and is subjected to a heat treatment or mechanical mixing. More specifically, it is a state in which sulfur is distributed on the surface or in the pores of the carbon material, a state in which sulfur and the carbon material are uniformly dispersed at the nano level and aggregated to form particles, a state in which the carbon material is distributed on the surface or inside of fine sulfur powder, or a state in which a plurality of these states are combined.

[0097] The positive electrode active material layer 3 may contain a positive electrode active material that does not contain sulfur instead of a positive electrode active material that contains sulfur. Examples of the positive electrode active material that does not contain sulfur include layered rock salt type active materials such as LiCoO2, LiMnO2, LiNiO2, LiVO2, and Li(Ni-Mn-Co)O2, LiMn2O4, LiNi 0.5 Mn 1.5 Examples of oxide active materials other than those mentioned above include spinel-type active materials such as LiFePO4 and LiMnPO4, olivine-type active materials such as Li2FeSiO4 and Li2MnSiO4, and Si-containing active materials such as Li4Ti5O 12 Examples include:

[0098] In some cases, two or more kinds of positive electrode active materials may be used in combination. Of course, positive electrode active materials other than those mentioned above may also be used.

[0099] The shape of the positive electrode active material may be, for example, particulate (spherical, fibrous), thin film, etc. When the positive electrode active material is particulate, the average particle size (D50) is, for example, preferably within the range of 1 nm to 100 μm, more preferably within the range of 10 nm to 50 μm, even more preferably within the range of 100 nm to 20 μm, and particularly preferably within the range of 1 to 20 μm. In this specification, the average particle size (D50) of the active material can be measured by a laser diffraction scattering method.

[0100] The content of the positive electrode active material in the positive electrode active material layer 3 is not particularly limited, but is preferably within the range of 40 to 99 mass %, and more preferably within the range of 50 to 90 mass %, for example.

[0101] Like the negative electrode active material layer 4, the positive electrode active material layer 3 may further contain a conductive assistant and / or a binder.

[0102] [Solid electrolyte layer] The solid electrolyte layer 5 included in the all-solid-state battery 100 according to this embodiment contains a solid electrolyte as a main component, and is a layer interposed between the above-mentioned positive electrode active material layer 3 and negative electrode active material layer 4. The specific form of the solid electrolyte contained in the solid electrolyte layer 5 is the same as that described above, and therefore a detailed description thereof will be omitted here.

[0103] The content of the solid electrolyte in the solid electrolyte layer 5 is, for example, preferably in the range of 10 to 100 mass %, more preferably in the range of 50 to 100 mass %, and further preferably in the range of 90 to 100 mass %.

[0104] The solid electrolyte layer 5 may further contain a binder in addition to the above-mentioned solid electrolyte. The specific form of the binder that can be contained in the solid electrolyte layer 5 is the same as that described above, and therefore a detailed description thereof will be omitted here.

[0105] The thickness of each of the solid electrolyte layers 5 differs depending on the intended configuration of the all-solid-state battery 100, but is preferably within the range of 0.1 to 1000 μm, and more preferably within the range of 0.1 to 300 μm, for example.

[0106] Although not shown, the all-solid-state battery 100 may include a positive electrode current collector member and a negative electrode current collector member for extracting electric power from one or more contained single cell layers 9 to the outside of the all-solid-state battery 100. In this case, the material constituting the current collector is not particularly limited, and a known highly conductive material conventionally used as a current collector for secondary batteries may be used.

[0107] Although not shown in the drawings, the positive electrode current collector 1 and the negative electrode current collector 2 may be electrically connected to the positive electrode current collector and the negative electrode current collector via a positive electrode lead and a negative electrode lead. As the constituent materials of the positive electrode and the negative electrode lead, materials used in known lithium ion secondary batteries may be similarly adopted.

[0108] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above-mentioned embodiments. In addition, the above-mentioned embodiments can be appropriately combined. [Explanation of symbols]

[0109] 100 solid state battery 1 Positive electrode current collector 2 Negative electrode current collector 3 Cathode active material layer 31 Outer edge 311 Margin 4 Negative electrode active material layer 41 Outer edge 411 Margin 412 Margin 5 Solid electrolyte layer

Claims

1. A solid electrolyte layer; one electrode and another electrode sandwiching the solid electrolyte layer; a first current collector sandwiching the one electrode together with the solid electrolyte layer, an end of the one electrode is inclined toward the first current collector; an edge of the end of the one electrode on the side of the solid electrolyte is disposed outside an edge of the end of the other electrode on the side of the solid electrolyte in a plan view; An edge of the end portion of the other electrode on the solid electrolyte layer side is disposed between an edge of the end portion of the one electrode on the solid electrolyte layer side and an edge of the end portion of the one electrode on the first current collector side in a plan view. All-solid-state battery.

2. The all-solid-state battery according to claim 1 , wherein an end of the solid electrolyte layer is exposed from an end of the one electrode and an end of the other electrode in a plan view.

3. a second current collector sandwiching the other electrode together with the solid electrolyte layer, The end of the other electrode is inclined toward the second current collector. The all-solid-state battery according to claim 1 or 2.

4. a second current collector sandwiching the other electrode together with the solid electrolyte layer, a contact area of ​​the one electrode with the solid electrolyte layer is set to be larger than a contact area of ​​the one electrode with the first current collector, The area of ​​the other electrode in contact with the solid electrolyte layer is set to be larger than the area of ​​the other electrode in contact with the second current collector. The all-solid-state battery according to claim 1 or 2.

5. A method for producing the all-solid-state battery according to any one of claims 1 to 4, comprising the steps of: cutting a preformed electrode material to form said electrode with said end portion; the electrode is sandwiched between the solid electrolyte layer and the first current collector and then pressurized to form the electrode.

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