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

Abstract

To provide an all-solid battery in which deterioration of an insulation quality due to peeling of a protection member is prevented.SOLUTION: An electrode body of an all-solid battery, includes: a first side surface portion; a second side surface portion opposite to the same; and a third side surface portion coupling the first and second side surface portions. In the first side surface portion, a protection member covering a side surface of at least one layer of a first activation layer, a solid electrolyte layer, and a second active material layer is arranged. In the third side surface portion, a fixing tight member X covering the side surface of at least one layer of the first active material layer, the solid electrolyte layer, and the second active material layer is arranged. When the electrode body is viewed from a thickness direction, (i) the electrode body includes a first side defined by the first side surface portion, a second side defined by the second side surface portion, and a third side defined by the third side surface portion, (ii) a first end portion of the protection member is arranged inside a shaft AX3 by using the shaft AX3 defined by the third side as reference, and (iii) the fixing tight member X is extended in such a way as to come in contact with the first end portion of the protection member.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to all-solid-state batteries and methods for manufacturing the same.

Background Art

[0002] An all-solid-state battery is a battery having a solid electrolyte layer between a positive electrode active material layer and a negative electrode active material layer, and has an advantage that it is easy to simplify a safety device as compared with a liquid-based battery having an electrolytic solution containing a flammable organic solvent. Patent Document 1 discloses a method for manufacturing an all-solid-state battery, in which a liquid resin is supplied to a side surface portion of the all-solid-state battery and then the liquid resin is cured. Further, Patent Document 2 discloses a laminated battery in which an insulating layer is provided at an end portion of an electrode layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When manufacturing an all-solid-state battery, for example, a protective member for ensuring insulation may be disposed on a side surface portion of a short side of the all-solid-state battery, and then the long side of the all-solid-state battery may be cut. At that time, if the protective member peels off, the insulation may decrease.

[0005] The present disclosure has been made in view of the above circumstances, and a main object thereof is to provide an all-solid-state battery that prevents a decrease in insulation due to peeling of a protective member.

Means for Solving the Problems

[0006] [1] An all-solid-state battery having a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector, and a current collecting tab connected to the electrode body, wherein the electrode body has a first side surface, a second side surface facing the first side surface, and a third side surface connecting the first side surface and the second side surface, and in the first side surface, the first active material layer, the solid electrolyte layer, and the second active material layer are flush, and a protective member covering a side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer is disposed on the first side surface, and in the third side surface, the first active material layer, the solid electrolyte layer, and the second active material layer are flush, and a binding member X covering a side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer is disposed on the third side surface, and when the electrode body is viewed in plan from the thickness direction, (i) the electrode body has a first side defined by the first side surface, a second side defined by the second side surface, and a third side defined by the third side surface, (ii) a first end portion of the protective member is disposed inside the axis AX3 defined by the third side, and (iii) the binding member X extends so as to contact the first end portion of the protective member. All-solid-state battery.

[0007] [2] The electrode body has a fourth side surface connecting the first side surface and the second side surface and facing the third side surface, and in the fourth side surface, the first active material layer, the solid electrolyte layer, and the second active material layer are flush, and a binding member Y covering a side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer is disposed on the fourth side surface, and when the electrode body is viewed in plan from the thickness direction, (iv) the electrode body has a fourth side defined by the fourth side surface, (v) a second end portion of the protective member is disposed inside the axis AX4 defined by the fourth side, and (vi) the binding member Y extends so as to contact the second end portion of the protective member. The all-solid-state battery according to [1].

[0008] [3] In a cross-sectional view in the thickness direction of the electrode body, the end of the first active material layer in the second side surface portion protrudes from the end of the second active material layer in the second side surface portion. The all-solid-state battery according to [1] or [2].

[0009] [4] The electrode body has a first active material layer A and a first active material layer B as the first active material layer, a solid electrolyte layer A and a solid electrolyte layer B as the solid electrolyte layer, a second active material layer A and a second active material layer B as the second active material layer, and a second current collector A and a second current collector B as the second current collector. The electrode body has the second current collector A, the second active material layer A, the solid electrolyte layer A, the first active material layer A, the first current collector, the first active material layer B, the solid electrolyte layer B, the second active material layer B, and the second current collector B in this order in the thickness direction. The all-solid-state battery according to any one of [1] to [3].

[0010] [5] The protective member is disposed so as to cover the side surface of the solid electrolyte layer A, the side surface of the first active material layer A, the side surface of the first current collector, the side surface of the first active material layer B, and the side surface of the solid electrolyte layer B on the first side surface portion. The all-solid-state battery according to [4].

[0011] [6] The first current collector and the first active material layer are a negative electrode current collector and a negative electrode active material layer, respectively, and the second current collector and the second active material layer are a positive electrode current collector and a positive electrode active material layer, respectively. The all-solid-state battery according to any one of [1] to [5].

[0012] [7] The electrode body has a plurality of the protective members in the thickness direction. The all-solid-state battery according to any one of [1] to [6].

[0013] [8] A method for manufacturing an all-solid-state battery according to any one of [1] to [7], comprising: a preparation step of preparing a precursor member of an electrode body having the first side surface portion and the second side surface portion and on which the protection member is disposed; a cutting step of cutting the precursor member to form the third side surface portion; and an arrangement step of arranging the fixing member X on the third side surface portion. A method for manufacturing an all-solid-state battery.

Effects of the Invention

[0014] In the present disclosure, there is an effect that an all-solid-state battery can be provided in which a decrease in insulation due to peeling of a protection member is prevented.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0016] Hereinafter, the all-solid-state battery in the present disclosure will be described in detail with reference to the drawings. Each of the drawings shown below is schematically illustrated, and the size and shape of each part are exaggerated as appropriate for easy understanding. Also, the hatching of each part may be omitted as appropriate.

[0017] A. All-solid-state battery FIG. 1(a) is a schematic plan view illustrating an all-solid-state battery in the present disclosure, and FIG. 1(b) is a cross-sectional view taken along line A-A of FIG. 1(a). Also, FIG. 2 is an enlarged view of a part of FIG. 1(b). FIG. 3 is an enlarged view of a part of the cross-sectional view taken along line B-B of FIG. 1(a).

[0018] The all-solid-state battery 100 shown in FIGS. 1(a) and 1(b) includes an electrode body 10, a current collecting tab T, a protective member 20, and a binding member 30. The electrode body 10 shown in FIG. 1(a) includes a first active material layer 2a, a solid electrolyte layer 3a, a second active material layer 4a, and a second current collector 5a arranged in order along the thickness direction D T from one surface of the first current collector 1, and a first active material layer 2b, a solid electrolyte layer 3b, a second active material layer 4b, and a second current collector 5b arranged in order along the thickness direction D T from the other surface of the first current collector 1. Also, as shown in FIGS. 1(a) and 1(b), the all-solid-state battery 100 includes, as current collecting tabs T, a first current collecting tab T1 connected to the first current collector 1, a second current collecting tab T5a connected to the second current collector 5a, and a second current collecting tab T5b connected to the second current collector 5b.

[0019] The electrode body in the present disclosure has a main surface and side portions. The main surface refers to a surface whose normal direction is parallel to the thickness direction of the electrode body. The side portions refer to surfaces whose normal directions intersect the normal direction of the main surface. The electrode body 10 shown in FIG. 1(a) has at least a first side portion SS1, a second side portion SS2, and a third side portion SS3 as side portions. In FIGS. 1(b) and 2, in the first side portion SS1, the first current collector 1, the first active material layer 2 (2a, 2b), the solid electrolyte layer 3 (3a, 3b), and the second active material layer 4 (4a, 4b) are flush. Further, in FIG. 2, a protective member 20 that covers the side surface of the first current collector 1, the side surfaces of the first active material layer 2 (2a, 2b), and the side surfaces of the solid electrolyte layer 3 (3a, 3b) is disposed on the first side portion SS1.

[0020] In FIG. 3, in the third side portion SS3, the first current collector 1, the first active material layer 2 (2a, 2b), the solid electrolyte layer 3 (3a, 3b), the second active material layer 4 (4a, 4b), and the second current collector 5 (5a, 5b) are flush, and a binding member X (binding member 30X) that covers these side surfaces is disposed. Further, as shown in FIG. 4, when the electrode body 10 is viewed in plan from the thickness direction, (i) the electrode body 10 has a first side S1 defined by the first side portion, a second side S2 (not shown) defined by the second side portion, and a third side S3 defined by the third side portion. Further, (ii) the first end portion 21 of the protective member 20 is disposed inside the axis AX3 with reference to the axis AX3 defined by the third side S3. Further, (iii) the binding member X (binding member 30X) extends so as to be in contact with the first end portion 21 of the protective member 20.

[0021] According to the present disclosure, by providing a predetermined protective member, an all-solid-state battery that prevents a decrease in insulation due to peeling of the protective member is obtained. Further, by providing a predetermined binding member, an all-solid-state battery that suppresses the occurrence of a short circuit is obtained. As described above, when manufacturing an all-solid-state battery, for example, a protective member for ensuring insulation may be disposed on the side portion on the short side of the all-solid-state battery, and then the long side of the all-solid-state battery may be cut. At that time, the protective member may peel off and the insulation may decrease.

[0022] For example, as shown in FIG. 5(a), when the electrode body 10 has the first side surface portion SS1 and the first side surface portion SS1 is flush, in order to prevent short - circuit, the protective member 20 is disposed on the first side surface portion SS1. When performing cutting along Cut Line 1 and Cut Line 2, if the protective member 20 is at the position to be cut, stress may be applied to the protective member 20 during cutting, and peeling of the protective member 20 may occur. In particular, when the thickness of the protective member 20 is thin, peeling of the protective member 20 is likely to occur. On the other hand, as shown in FIG. 5(b), when performing cutting along Cut Line 1 and Cut Line 2, by the fact that the protective member 20 is not at the position to be cut, it is possible to prevent stress from being applied to the protective member 20 during cutting. On the other hand, when performing cutting along Cut Line 1 and Cut Line 2, if the protective member 20 is not at the position to be cut, a part of the first side surface portion SS1 is not protected by the protective member 20, so there is a possibility that the insulation property may deteriorate. In contrast, in the present disclosure, as shown in FIG. 4, the binding member 30 extends so as to be in contact with the end portions (the first end portion 21 and the second end portion) of the protective member 20, that is, the binding member 30 protects the first side surface portion SS1 that is not protected by the protective member 20. Therefore, it becomes an all - solid - state battery that suppresses the occurrence of short - circuit. Further, since the binding member 30X extends from the third side surface portion SS3 to the first side surface portion SS1 and has an L - shape, the adhesion (adhesiveness) to the electrode body 10 is improved.

[0023] 1. Configuration of All - Solid - State Battery The all - solid - state battery in the present disclosure has an electrode body, a current - collecting tab, a protective member, and a binding member.

[0024] The electrode body in the present disclosure has a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector. The configuration of the electrode body is not particularly limited as long as it functions as a battery. For example, the electrode body may have the first current collector, the first active material layer, the solid electrolyte layer, the second active material layer, and the second current collector in this order in the thickness direction. Further, the electrode body may have one, two, or three or more power generation units composed of the first active material layer, the solid electrolyte layer, and the second active material layer. When the electrode body has a plurality of power generation units, they may be connected in parallel or in series.

[0025] For example, the electrode body 10 shown in Fig. 1(b) has (i) a first active material layer 2 including a first active material layer A (first active material layer 2a) and a first active material layer B (first active material layer 2b), (ii) a solid electrolyte layer 3 including a solid electrolyte layer A (solid electrolyte layer 3a) and a solid electrolyte layer B (solid electrolyte layer 3b), (iii) a second active material layer 4 including a second active material layer A (second active material layer 4a) and a second active material layer B (second active material layer 4b), and (iv) a second current collector 5 including a second current collector A (second current collector 5a) and a second current collector B (second current collector 5b). Further, these layers are arranged in the thickness direction in the order of the second current collector A (second current collector 5a), the second active material layer A (second active material layer 4a), the solid electrolyte layer A (solid electrolyte layer 3a), the first active material layer A (first active material layer 2a), the first current collector 1, the first active material layer B (first active material layer 2b), the solid electrolyte layer B (solid electrolyte layer 3b), the second active material layer B (second active material layer 4b), and the second current collector B (second current collector 5b).

[0026] As shown in Fig. 1(a), the electrode body 10 has, as side faces, a first side face SS1, a second side face SS2, a third side face SS3, and a fourth side face SS4. The second side face SS2 is arranged to face the first side face SS1. The third side face SS3 is arranged to connect the first side face SS1 and the second side face SS2. The fourth side face SS4 is arranged to connect the first side face SS1 and the second side face SS2 and to face the third side face SS3. As shown in Fig. 1(a), the first side face SS1 and the second side face SS2 may correspond to the side faces on the short side, and the third side face SS3 and the fourth side face SS4 may correspond to the side faces on the long side.

[0027] As shown in Fig. 2, in the first side face SS1, the first active material layer 2a, the solid electrolyte layer 3a, and the second active material layer 4a are flush. In this way, when the solid electrolyte layer 3a and the first active material layer 2a and the second active material layer 4a arranged on both sides thereof are flush, a short circuit is likely to occur. Therefore, it is preferable to insulate with a protective member. In the present disclosure, "being flush" means that, as shown in Fig. 2, when the side face is viewed in cross section, in the direction D T orthogonal to the thickness direction D X for example, in the first side face SS1 shown in Fig. 2, the position of the end 2t of the first active material layer 2a, the position of the end 3t of the solid electrolyte layer 3a, and the position of the end 4t of the second active material layer 4a are completely coincident in the thickness direction D T Therefore, in the direction D X the distance (δ1) between the end of the most protruding layer and the end of the least protruding layer is 0.

[0028] As shown in Fig. 2, in the first side face SS1, the three layers of the first active material layer 2a, the solid electrolyte layer 3a, and the second active material layer 4a and the first current collector 1 may be flush. Also, as shown in Fig. 2, in the first side face SS1, all of the first current collector 1, the first active material layer 2 (2a, 2b), the solid electrolyte layer 3 (3a, 3b), and the second active material layer 4 (4a, 4b) may be flush.

[0029] The protective member in the present disclosure covers the side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer. For example, when the protective member covers the side surface of the first active material layer, the protective member may cover the entire side surface of the first active material layer or may cover a part of the side surface of the first active material layer. This also applies when the protective member covers the side surface of the solid electrolyte layer and when the protective member covers the side surface of the second active material layer. The protective member 20 shown in FIG. 2 covers at least the entire side surface of the first active material layer 2a and a part of the side surface of the solid electrolyte layer 3a. Further, as shown in FIG. 2, the protective member 20 may cover the side surface of the first current collector 1, the side surface of the first active material layer 2 (2a, 2b), and the side surface of the solid electrolyte layer 3 (3a, 3b).

[0030] As shown in FIG. 2, when the thickness (length in the direction D X of) the protective member 20 is T 20 , T 20 is, for example, 10 μm or more and 200 μm or less, and may be 50 μm or more and 100 μm or less.

[0031] As shown in FIG. 3, in the third side surface portion SS3, the first active material layer 2a, the solid electrolyte layer 3a, and the second active material layer 4a are flush. In this way, when the solid electrolyte layer 3a and the first active material layer 2a and the second active material layer 4a disposed on both sides thereof are flush, a short circuit is likely to occur. Therefore, it is preferable to insulate with the binding member X. Further, as shown in FIG. 3, in the third side surface portion SS3, the three layers of the first active material layer 2a, the solid electrolyte layer 3a, and the second active material layer 4a and the first current collector 1 may be flush. Further, as shown in FIG. 3, in the third side surface portion SS3, all of the first current collector 1, the first active material layer 2 (2a, 2b), the solid electrolyte layer 3 (3a, 3b), the second active material layer 4 (4a, 4b), and the second current collector 5 (5a, 5b) may be flush.

[0032] In the present disclosure, the binding member X is disposed on the third side surface SS3. By providing the binding member X, displacement of the positions of the respective layers constituting the electrode body can be prevented. The binding member X usually covers the side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer. For example, when the binding member X covers the side surface of the first active material layer, the binding member X may cover the entire side surface of the first active material layer or may cover a part of the side surface of the first active material layer. This also applies to the case where the binding member X covers the side surface of the solid electrolyte layer, the case where the binding member X covers the side surface of the second active material layer, and the case where the binding member X covers the side surface of the second current collector. The binding member X (binding member 30X) shown in FIG. 3 covers at least the entire side surface of the first active material layer 2a, the entire side surface of the solid electrolyte layer 3a, and the entire side surface of the second active material layer 4a. Further, as shown in FIG. 3, the binding member X (binding member 30X) may cover the side surface of the first current collector 1, the side surface of the first active material layer 2 (2a, 2b), the side surface of the solid electrolyte layer 3 (3a, 3b), the side surface of the second active material layer 4a, and the side surface of the second current collector 5 (5a, 5b).

[0033] As shown in FIG. 3, when the thickness (direction D X and the direction D T orthogonal to the direction D Y of the length in) of the binding member X (binding member 30X) is T 30 then, T 30 is, for example, 50 μm or more and 5 mm or less, and may be 100 μm or more and 3 mm or less.

[0034] FIG. 4 is a schematic plan view illustrating the all-solid-state battery in the present disclosure. In FIG. 4, for convenience, the second current collector 5 and the second current collecting tab T5 are shown by continuous dotted lines, but the second current collector 5 corresponds to a member constituting the electrode body 10. As shown in FIG. 4, when the electrode body 10 is viewed in plan from the thickness direction, (i) the electrode body 10 has a first side S1 defined by a first side surface portion, a second side S2 (not shown) defined by a second side surface portion, and a third side S3 defined by a third side surface portion. Further, (ii) the first end portion 21 of the protective member 20 is disposed inside the axis AX3 (on the side of the fourth side S4) with respect to the axis AX3 defined by the third side S3. Further, (iii) the binding member X (binding member 30X) extends so as to be in contact with the first end portion 21 of the protective member 20. That is, the binding member X (binding member 30X) extends inside the axis AX3 (on the side of the fourth side S4) with respect to the axis AX3 and is in contact with the first end portion 21.

[0035] As shown in FIG. 4, in the direction D Y when the distance between the end portion of the binding member X (binding member 30X) and the axis AX3 is W 30 then W 30 is, for example, 1 mm or more and 10 mm or less.

[0036] As shown in FIG. 4, when the electrode body 10 is viewed in plan from the thickness direction, it is preferable that the first end portion 21 in the protective member 20 is in a position that does not overlap with the second current collecting tab T5. This is because the occurrence of a short circuit can be more suppressed. In FIG. 4, a region E including the first end portion 21 and not overlapping with the second current collecting tab T5 is formed. Further, as shown in FIG. 6, the electrode body 10 may have a plurality of protective members 20 in the thickness direction D T In this case, it is preferable that the third side surface portions are flush. Such third side surface portions can be obtained by performing a cutting step described later on a precursor member of the electrode body having a plurality of protective members 20.

[0037] As shown in Fig. 1(a), the electrode body 10 has, as a side surface portion, a fourth side surface portion SS4 facing the third side surface portion SS3. A fixing member Y (fixing member 30Y) may be disposed on the fourth side surface portion SS4. Since the details of the fixing member Y are the same as those described for the fixing member X above, the description here is omitted. Further, as shown in Fig. 4, when the electrode body 10 is viewed in plan from the thickness direction, (iv) the electrode body 10 may further have a fourth side S4 defined by the fourth side surface portion. Further, (v) the second end portion 22 of the protection member 20 may be disposed inside the axis AX4 (on the side of the third side S3) with respect to the axis AX4 defined by the fourth side S4. Further, (vi) the fixing member Y (fixing member 30Y) extends so as to be in contact with the second end portion 22 of the protection member 20. That is, the fixing member Y (fixing member 30Y) may extend inside the axis AX4 (on the side of the third side S3) with respect to the axis AX4 and be in contact with the second end portion 22.

[0038] As shown in Fig. 7, in the thickness direction D of the electrode body 10 T in a cross-sectional view, it is preferable that the end portion of the first active material layer 2a in the second side surface portion SS2 protrudes from the end portion of the second active material layer 4a in the second side surface portion SS2. By providing such a step, it becomes difficult for a short circuit to occur. "Protruding" means that, as shown in Fig. 6, in the direction D X the distance (δ2) between the end portion of the first active material layer 2a and the end portion of the second active material layer 4a is greater than 1 mm. Similarly, it is preferable that the end portion of the solid electrolyte layer 3a in the second side surface portion SS2 protrudes from the end portion of the second active material layer 4a in the second side surface portion SS2. By providing such a step, it becomes difficult for a short circuit to occur. In the direction D X the distance (δ3) between the end portion of the solid electrolyte layer 3a and the end portion of the second active material layer 4a is preferably the same as δ2 described above.

[0039] 2. Members of the all-solid-state battery The all-solid-state battery in the present disclosure has an electrode body, a current collecting tab, a protection member, and a fixing member.

[0040] The electrode body in the present disclosure has a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector. The first current collector and the first active material layer may be a positive electrode current collector and a positive electrode active material layer, respectively. In this case, the second current collector and the second active material layer are a negative electrode current collector and a negative electrode active material layer, respectively. Conversely, the first current collector and the first active material layer may be a negative electrode current collector and a negative electrode active material layer, respectively. In this case, the second current collector and the second active material layer are the first current collector and the first active material layer, respectively.

[0041] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer may further contain at least one of a conductive material, a solid electrolyte, and a binder. Examples of the positive electrode active material include oxide active materials such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2. Examples of the conductive material include carbon materials. The solid electrolyte may be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as an oxide solid electrolyte or a sulfide solid electrolyte. Examples of the binder include a rubber-based binder and a fluoride-based binder.

[0042] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer may further contain at least one of a conductive material, a solid electrolyte, and a binder. Examples of the negative electrode active material include metal active materials such as Li and Si, carbon active materials such as graphite, and oxide active materials such as Li4Ti5O 12 etc. The conductive material, the solid electrolyte, and the binder are the same as those described above. The solid electrolyte layer is disposed between the positive electrode active material layer and the negative electrode active material layer and contains at least a solid electrolyte. The solid electrolyte is the same as that described above.

[0043] The positive electrode current collector conducts the current collection of the positive electrode active material layer. Examples of the material of the positive electrode current collector include metals such as aluminum, SUS, and nickel. Examples of the shape of the positive electrode current collector include a foil shape. The positive electrode current collector may have a carbon coating layer on the surface on the positive electrode active material layer side. The negative electrode current collector conducts the current collection of the negative electrode active material layer. Examples of the material of the negative electrode current collector include metals such as copper, SUS, and nickel. Examples of the shape of the negative electrode current collector include a foil shape. The negative electrode current collector may have a carbon coating layer on the surface on the negative electrode active material layer side.

[0044] The all-solid-state battery in the present disclosure has, as current collection tabs, a first current collection tab connected to the first current collector and a second current collection tab connected to the second current collector. In the thickness direction of the electrode body, the first current collection tab is disposed at a position that does not overlap with the first active material layer. Similarly, the second current collection tab is disposed at a position that does not overlap with the second active material layer. One of the first current collection tab and the second current collection tab is a positive electrode tab, and the other is a negative electrode tab. In FIG. 1(b), the first current collection tab T1 extends from the second side surface SS2 of the electrode body 10 in a direction intersecting the thickness direction D of the electrode body 10. T Also, in FIG. 1(b), the second current collection tab T5 (T5a, T5b) extends from the first side surface SS1 of the electrode body 10 in a direction intersecting the thickness direction D of the electrode body 10. T Further, as shown in FIG. 1(b), the first current collection tab T1 is preferably formed continuously from the first current collector 1. Similarly, the second current collection tab T5 is preferably formed continuously from the second current collector 5. The material of the current collection tab is not particularly limited, and examples thereof include the same materials as those of the current collectors described above.

[0045] The material of the protective member in the present disclosure is not particularly limited, and examples thereof include resins. Examples of the resin include olefin resins such as polyethylene and polypropylene; polyimide resins. Also, the material of the binding member in the present disclosure is not particularly limited, and examples thereof include resins. The resin used for the binding member is, for example, the same as the resin used for the protective member described above.

[0046] The all-solid-state battery in the present disclosure may have a current collecting terminal electrically connected to the current collecting tab. The current collecting terminal is a terminal for conducting electricity generated in the electrode body to the outside of the all-solid-state battery. The shape of the current collecting terminal may be, for example, a plate shape. In addition, the material of the current collecting terminal may be, for example, a metal such as Al or SUS. In addition, the all-solid-state battery in the present disclosure usually has an exterior body that covers the electrode body, the current collecting tab, the protective member, and the fastening member. The exterior body may be a laminate type exterior body or a case type exterior body.

[0047] The all-solid-state battery in the present disclosure is typically a lithium-ion secondary battery. Examples of applications of the all-solid-state battery include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), electric vehicles (BEVs), gasoline-powered vehicles, and diesel-powered vehicles. In particular, it is preferable to use the all-solid-state battery as a driving power source for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or electric vehicles (BEVs). The all-solid-state battery in the present disclosure may also be used as a power source for moving objects other than vehicles (e.g., railways, ships, and aircraft), and may also be used as a power source for electrical products such as information processing devices.

[0048] B. Manufacturing method of all-solid-state batteries A manufacturing method of an all-solid-state battery in the present disclosure is a manufacturing method of the above-mentioned all-solid-state battery, and includes a preparation step of preparing a precursor member of an electrode body having the first side portion and the second side portion and having the protective member disposed thereon, a cutting step of cutting the precursor member at a side portion connecting the first side portion and the second side portion to form the third side portion, and an arrangement step of arranging the fastening member X on the third side portion.

[0049] According to the present disclosure, an all-solid-state battery can be obtained in which a deterioration in insulation properties due to peeling of a protective member is prevented by providing a predetermined protective member, and further, an all-solid-state battery in which the occurrence of a short circuit is suppressed by providing a predetermined fastening member.

[0050] 1. Preparation process The preparation process in the present disclosure is a process of preparing a precursor member of an electrode body having the first side surface portion and the second side surface portion, and on which the protection member is disposed. This precursor member usually has a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector. The precursor member preferably has a first current collector tab continuously formed from the first current collector and a second current collector tab continuously formed from the second current collector. Further, the precursor member has a first side surface portion and a second side surface portion facing the first side surface portion, and on the first side surface portion, the first active material layer, the solid electrolyte layer, and the second active material layer are flush. Further, a protection member that covers at least the side surface of the first active material layer is disposed on the first side surface portion. These details and preferred embodiments are the same as those described in the above "A. All-solid-state battery". Further, the precursor member may have a plurality of protection members in the thickness direction.

[0051] FIG. 8 is a schematic cross-sectional view illustrating a preparation process in the present disclosure. First, as shown in FIG. 8(a), a first current collector 1 (including a first current collecting tab T1) is prepared. Next, as shown in FIG. 8(b), a first active material layer 2a and a first active material layer 2b are formed on both sides of the first current collector 1, respectively. Examples of the method for forming the first active material layer 2 include a method of applying a slurry for forming the first active material layer 2 and drying it (coating method). Next, as shown in FIG. 8(c), a solid electrolyte layer 3a is formed on the first active material layer 2a, and a solid electrolyte layer 3b is formed on the first active material layer 2b. Examples of the method for forming the solid electrolyte layer 3 include a method of transferring the solid electrolyte layer 3 onto the first active material layer 2 using a sheet on which the solid electrolyte layer 3 is formed on a metal foil (transfer method). Next, as shown in FIG. 8(d), a second active material layer 4a is formed on the solid electrolyte layer 3a, and a second active material layer 4b is formed on the solid electrolyte layer 3b. Examples of the method for forming the second active material layer 4 include the same method as the above-described transfer method or coating method. Thereafter, a part of the obtained laminate is cut along the thickness direction to form a first side surface portion SS1. Next, as shown in FIG. 8(e), a protective member 20 is disposed on the first side surface portion SS1. Examples of the method for disposing the protective member 20 include welding. Next, as shown in FIG. 8(f), a second current collector 5a (including a second current collecting tab T5a) is disposed on the second active material layer 4a, and a second current collector 5b (including a second current collecting tab T5b) is disposed on the second active material layer 4b. Thereby, a precursor member 101 is obtained.

[0052] 2. Cutting Step and Disposing Step The cutting step in the present disclosure is a step of cutting the above precursor member to form the above third side surface portion. Further, the disposing step in the present disclosure is a step of disposing the above binding member X on the above third side surface portion.

[0053] FIG. 9 is a schematic cross-sectional view illustrating a cutting step and an arranging step in the present disclosure. As shown in FIGS. 9(a) and 9(b), the precursor member 101 is cut along Cut Line 1 to form the third side surface portion SS3. At this time, the first end portion 21 of the protective member 20 is disposed at a position not cut by Cut Line 1. Also, in FIGS. 9(a) and 9(b), the precursor member 101 is cut along Cut Line 2 to form the fourth side surface portion SS4. At this time, the second end portion 22 of the protective member 20 is disposed at a position not cut by Cut Line 2.

[0054] Next, as shown in FIG. 9(c), the binding member X (binding member 30X) is disposed on the third side surface portion SS3. Further, the binding member X (binding member 30X) is disposed so as to be in contact with the first end portion 21 of the protective member 20. Also, in FIG. 9(c), the binding member Y (binding member 30Y) is disposed on the fourth side surface portion SS3. Further, the binding member Y (binding member 30Y) is disposed so as to be in contact with the second end portion 22 of the protective member 20. Thereby, the all-solid-state battery 100 is obtained.

[0055] 3. All-solid-state battery Regarding the all-solid-state battery obtained by the above-described respective steps, since it is the same as the content described in the above “A. All-solid-state battery”, the description here is omitted.

[0056] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are examples, and any configuration that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits the same operational effects is included in the technical scope of the present disclosure.

Description of reference numerals

[0057] 1... First current collector 2... First active material layer 3... Solid electrolyte layer 4... Second active material layer 5... Second current collector 10... Electrode body 20... Protective member 30... Binding member 100... All-solid-state battery

Claims

1. A all-solid-state battery comprising an electrode body having a first current collector, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector, and a current collecting tab connected to the electrode body, The electrode body has a first side surface, a second side surface facing the first side surface, a third side surface connecting the first side surface and the second side surface, and a fourth side surface connecting the first side surface and the second side surface and facing the third side surface, The current collecting tab has a first current collecting tab connected to the first current collector and a second current collecting tab connected to the second current collector, On the first side surface, the first active material layer, the solid electrolyte layer, and the second active material layer are flush, A protective member covering the side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer is disposed on the first side surface, On the third side surface, the first active material layer, the solid electrolyte layer, and the second active material layer are flush, A binding member X covering the side surface of at least one of the first active material layer, the solid electrolyte layer, and the second active material layer is disposed on the third side surface, The protective member and the binding member X are separate members, When the electrode body is viewed in plan from the thickness direction, (i) The electrode body has a first side defined by the first side surface, a second side defined by the second side surface, and a third side defined by the third side surface, (ii) A first end portion of the protective member is disposed inside the axis AX defined by the third side ３ with reference to the axis AX ３ and is disposed inside the axis AX, and (iii) The binding member X extends so as to be in contact with the first end portion of the protective member. All-solid-state battery.

2. On the fourth side surface, the first active material layer, the solid electrolyte layer, and the second active material layer are flush, On the fourth side surface, a binding member Y is disposed to cover the side surface of at least one layer of the first active material layer, the solid electrolyte layer, and the second active material layer. When the electrode body is viewed in plan from the thickness direction, (iv) the electrode body has a fourth side defined by the fourth side surface, (v) the second end portion of the protective member is located inside the axis AX defined by the fourth side ４ with reference to the axis AX ４ and is disposed inside the axis AX, and (vi) the binding member Y extends so as to be in contact with the second end portion of the protective member. The all-solid-state battery according to claim 1. **Claim 3** In a cross-sectional view of the electrode body in the thickness direction, an end portion of the first active material layer in the second side surface protrudes from an end portion of the second active material layer in the second side surface. The all-solid-state battery according to claim 1 or claim 2. **Claim 4** The electrode body has a first active material layer A and a first active material layer B as the first active material layer, a solid electrolyte layer A and a solid electrolyte layer B as the solid electrolyte layer, a second active material layer A and a second active material layer B as the second active material layer, and a second current collector A and a second current collector B as the second current collector. The electrode body has the second current collector A, the second active material layer A, the solid electrolyte layer A, the first active material layer A, the first current collector, the first active material layer B, the solid electrolyte layer B, the second active material layer B, and the second current collector B in this order in the thickness direction. The all-solid-state battery according to claim 1 or claim 2. **Claim 5** The protective member is disposed on the first side surface so as to cover the side surfaces of the solid electrolyte layer A, the first active material layer A, the first current collector, the first active material layer B, and the solid electrolyte layer B. The all-solid-state battery according to claim 4. **Claim 6** The first current collector and the first active material layer are a negative electrode current collector and a negative electrode active material layer, respectively. The all-solid-state battery according to claim 1 or claim 2, wherein the second current collector and the second active material layer are a positive electrode current collector and a positive electrode active material layer, respectively.

7. The all-solid-state battery according to claim 1 or claim 2, wherein the electrode body has a plurality of the protection members in the thickness direction.

8. A method for manufacturing the all-solid-state battery according to claim 1 or claim 2, comprising: a preparation step of preparing a precursor member of the electrode body, which has the first side surface portion and the second side surface portion and on which the protection member is disposed; a cutting step of cutting the precursor member to form the third side surface portion; a placement step of placing the fixing member X on the third side surface portion; A method for manufacturing an all-solid-state battery, comprising the above steps.

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