Solid-state battery and method of manufacturing the same

Abstract

To provide a solid-state battery which is capable of suppressing the occurrence of extension and displacement of an electrode during manufacture and suppressing the occurrence of lamination displacement even if an electrode laminate is laminated and used.SOLUTION: A solid-state battery 10 comprises an electrode laminate 11 configured by successively laminating a cathode mixture layer 11c, a solid electrolyte layer 11d, an anode mixture layer 11e, and a second fixing member 11g on a first fixing member 11a. In the solid-state battery 10, a first guide member 12 is disposed in an outer peripheral part of the cathode mixture layer 11c, and a second guide member 13 is disposed in an outer peripheral part of the anode mixture layer 11e. The first guide member 12 is joined to the solid electrolyte layer 11d, and the second guide member 13 is joined to the solid electrolyte layer 11d and the second fixing member 11g.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, research and development into secondary batteries that contribute to energy efficiency has been conducted to ensure that many people have access to affordable, reliable, sustainable and advanced energy.

[0003] 2. Description of the Related Art Known secondary batteries include solid-state batteries that include an electrode stack in which a positive electrode composite layer, a solid electrolyte layer, and a negative electrode composite layer are stacked in this order.

[0004] Patent Document 1 describes a method for manufacturing an all-solid-state battery in which a positive electrode and a negative electrode having a larger area than the positive electrode are stacked with a solid electrolyte layer interposed between them. Specifically, an insulator having a thickness equal to or less than that of the positive electrode is disposed in a part of a gap formed between the negative electrode and the outer periphery of the positive electrode, with a gap provided between the positive electrode and the insulator, and a solid electrolyte layer is interposed between the positive electrode and the negative electrode, and pressure is applied from both sides. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-162353 Summary of the Invention [Problem to be solved by the invention]

[0006] However, during the production of all-solid-state batteries, the electrodes (positive and negative electrodes) stretch and shift, which can lead to short circuits, cracks, and wrinkles in the components. Furthermore, when an electrode stack is used in which a positive electrode and a negative electrode are stacked with a solid electrolyte layer interposed therebetween, the current collectors come into contact with each other, which can lead to stacking shifts due to vibration, collision, and the like.

[0007] The present invention aims to provide a solid-state battery that can suppress the occurrence of electrode stretching and displacement during manufacturing, and can also suppress the occurrence of stacking displacement even when electrode stacks are stacked and used. [Means for solving the problem]

[0008] (1) A solid-state battery comprising an electrode stack in which a first electrode mixture layer, a solid electrolyte layer, a second electrode mixture layer, and a second fixing member are sequentially stacked on a first fixing member, a first guide member is disposed on the outer periphery of the first electrode mixture layer, a second guide member is disposed on the outer periphery of the second electrode mixture layer, the first guide member is bonded to the solid electrolyte layer and / or the first fixing member, and the second guide member is bonded to the solid electrolyte layer and / or the second fixing member.

[0009] (2) The solid-state battery according to (1), wherein at least one of the solid electrolyte layer, the first fixing member, the second fixing member, the first guide member, and the second guide member contains a nonwoven fabric, the content of the nonwoven fabric in the solid electrolyte layer is equal to or less than the content of the nonwoven fabric in the first fixing member, equal to or less than the content of the nonwoven fabric in the second fixing member, equal to or less than the content of the nonwoven fabric in the first guide member, and equal to or less than the content of the nonwoven fabric in the second guide member, and the average fiber diameter of the nonwoven fabric in the solid electrolyte layer is equal to or less than the average fiber diameter of the nonwoven fabric in the first fixing member, equal to or less than the average fiber diameter of the nonwoven fabric in the second fixing member, equal to or less than the average fiber diameter of the nonwoven fabric in the first guide member, and equal to or less than the average fiber diameter of the nonwoven fabric in the second guide member.

[0010] (3) The solid state battery according to (1), wherein the solid electrolyte layer, the first fixing member, the second fixing member, the first guide member, and the second guide member each contain a binder, and the content of the binder in the solid electrolyte layer is equal to or less than the content of the binder in the first fixing member, equal to or less than the content of the binder in the second fixing member, equal to or less than the content of the binder in the first guide member, and equal to or less than the content of the binder in the second guide member, respectively.

[0011] (4) The solid-state battery according to (1), wherein the first electrode mixture layer and the second electrode mixture layer are a positive electrode mixture layer and a negative electrode mixture layer, respectively, the second guide member is an elastic member, and the first fixing member, the second fixing member, and the first guide member are each elastic members having a Young's modulus higher than that of the second guide member.

[0012] (5) A method for manufacturing the solid-state battery according to any one of (1) to (4), comprising: a first arrangement step of arranging the first guide member on the first fixing member; a second arrangement step of arranging the first electrode mixture layer in an area of ​​the first fixing member where the first guide member is not arranged; a third arrangement step of arranging the solid electrolyte layer on the first guide member and the first electrode mixture layer; a fourth arrangement step of arranging the second guide member on the solid electrolyte layer; a fifth arrangement step of arranging the second electrode mixture layer in an area of ​​the solid electrolyte layer where the second guide member is not arranged; a sixth arrangement step of arranging the second fixing member on the second guide member and the second electrode mixture layer; and a joining step of joining the first guide member to the solid electrolyte layer and / or the first fixing member and joining the second guide member to the solid electrolyte layer and / or the second fixing member.

[0013] (6) The method for manufacturing a solid-state battery according to (5), further comprising a temporary joining step of temporarily joining the first fixing member and the first guide member between the first arranging step and the second arranging step.

[0014] (7) The method for manufacturing a solid state battery according to (5) or (6), further comprising a temporary bonding step of temporarily bonding the first guide member and the solid electrolyte layer between the third arranging step and the fourth arranging step.

[0015] (8) The method for manufacturing a solid state battery according to any one of (5) to (7), further comprising a temporary bonding step of temporarily bonding the solid electrolyte layer and the second guide member between the fourth disposing step and the fifth disposing step. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a solid-state battery that can suppress the occurrence of electrode stretching and displacement during manufacturing, and can also suppress the occurrence of stacking displacement even when electrode stacks are stacked and used. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view showing an example of a solid-state battery according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing a modified example of the solid-state battery of FIG. [Figure 3] FIG. 2 is a cross-sectional view showing another example of the solid state battery of the present embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a modified example of the solid-state battery of FIG. [Figure 5] FIG. 2 is a cross-sectional view showing another example of the solid state battery of the present embodiment. [Figure 6] 1 is a top view (part 1) showing an example of a method for manufacturing a solid state battery according to the present embodiment. [Figure 7] 4 is a top view (part 2) showing an example of the method for manufacturing the solid state battery of the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] FIG. 1 shows an example of the solid state battery of this embodiment.

[0020] The solid-state battery 10 includes an electrode stack 11 in which a positive electrode current collector 11b, a positive electrode composite layer 11c as a first electrode composite layer, a solid electrolyte layer 11d, a negative electrode composite layer 11e as a second electrode composite layer, a negative electrode current collector 11f, and a second fixing member 11g are sequentially stacked on a first fixing member 11a. Therefore, even when the electrode stack 11 is stacked and used, the occurrence of stacking misalignment is suppressed. A first guide member 12 is disposed around the outer periphery of the positive electrode current collector 11b and the positive electrode composite layer 11c, and a second guide member 13 is disposed around the outer periphery of the negative electrode composite layer 11e and the negative electrode current collector 11f. The solid electrolyte layer 11d is interposed between the first guide member 12 and the second guide member 13. Furthermore, because first guide member 12 is joined to first fixing member 11a and solid electrolyte layer 11d, stretching and displacement of the positive electrode (positive electrode current collector 11b and positive electrode composite layer 11c) are suppressed during manufacture of solid battery 10. Furthermore, because second guide member 13 is joined to solid electrolyte layer 11d and second fixing member 11g, stretching and displacement of the negative electrode (negative electrode current collector 11f and negative electrode composite layer 11e) are suppressed during manufacture of solid battery 10.

[0021] When negative electrode mixture layer 11e is a lithium metal layer, negative electrode mixture layer 11e does not have to be present in the initial state, that is, solid state battery 10 may be anode-free.

[0022] The materials constituting the first fixing member 11a, the second fixing member 11g, the first guide member 12 and the second guide member 13 are not particularly limited as long as they do not have electronic conductivity, but examples include rubber, binders such as urethane resin, nonwoven fabric, solid electrolytes, etc.

[0023] When solid electrolyte layer 11d, first fixing member 11a, second fixing member 11g, first guide member 12, and second guide member 13 each contain nonwoven fabric, the content of nonwoven fabric in solid electrolyte layer 11d is preferably equal to or less than the content of nonwoven fabric in first fixing member 11a, equal to or less than the content of nonwoven fabric in second fixing member 11g, equal to or less than the content of nonwoven fabric in first guide member 12, and equal to or less than the content of nonwoven fabric in second guide member 13. Furthermore, the average fiber diameter of the nonwoven fabric in solid electrolyte layer 11d is preferably equal to or less than the average fiber diameter of the nonwoven fabric in first fixing member 11a, equal to or less than the average fiber diameter of the nonwoven fabric in second fixing member 11g, equal to or less than the average fiber diameter of the nonwoven fabric in first guide member 12, and equal to or less than the average fiber diameter of the nonwoven fabric in second guide member 13. This allows the strength of first fixing member 11a, second fixing member 11g, first guide member 12, and second guide member 13 to be equal to or greater than the strength of solid electrolyte layer 11d.

[0024] When solid electrolyte layer 11d, first fixing member 11a, second fixing member 11g, first guide member 12, and second guide member 13 each contain a binder, it is preferable that the content of the nonwoven fabric in solid electrolyte layer 11d is equal to or less than the content of the binder in first fixing member 11a, equal to or less than the content of the binder in second fixing member 11g, equal to or less than the content of the binder in first guide member 12, and equal to or less than the content of the binder in second guide member 13. This allows the strength of first fixing member 11a, second fixing member 11g, first guide member 12, and second guide member 13 to be equal to or greater than the strength of solid electrolyte layer 11d.

[0025] The materials constituting solid electrolyte layer 11d, first fixing member 11a, second fixing member 11g, first guide member 12, and second guide member 13 may be different, but are preferably the same. This improves the bonding strength between first guide member 12 and first fixing member 11a and solid electrolyte layer 11d, and the bonding strength between second guide member 13 and solid electrolyte layer 11d and second fixing member 11g, thereby suppressing misalignment of positive electrode composite layer 11c and negative electrode composite layer 11e during production of solid battery 10.

[0026] FIG. 2 shows a modified example of the solid-state battery 10.

[0027] Solid-state battery 10A has the same configuration as solid-state battery 10, except that electrode stack 11A is arranged so that solid electrolyte layer 11d is not interposed between first guide member 12 and second guide member 13A. That is, second guide member 13A is arranged around the periphery of solid electrolyte layer 11d, negative electrode composite layer 11e, and negative electrode current collector 11f. Furthermore, first guide member 12 is joined to first fixing member 11a and second guide member 13, and second guide member 13 is joined to second fixing member 11g and first guide member 12.

[0028] FIG. 3 shows another example of the solid state battery of this embodiment.

[0029] The solid-state battery 20 includes an electrode stack 21 in which a negative electrode current collector 11f, a negative electrode composite layer 11e, a solid electrolyte layer 11d, a positive electrode composite layer 11c, a positive electrode current collector 11b, a positive electrode composite layer 11c, a solid electrolyte layer 11d, a negative electrode composite layer 11e, a negative electrode current collector 11f, and a second fixing member 11g are sequentially stacked on a first fixing member 11a. Therefore, even when the electrode stacks 11 are stacked and used, the occurrence of stack misalignment is suppressed. The electrode stack 21 is similar to the electrode stack 11 except for its stacking structure. A first guide member 22 is disposed around the outer periphery of the positive electrode composite layer 11c, the positive electrode current collector 11b, and the positive electrode composite layer 11c, and a second guide member 23 is disposed around the outer periphery of the negative electrode composite layer 11e and the negative electrode current collector 11f. Moreover, first guide member 22 is joined to solid electrolyte layers 11d arranged on both sides of electrode stack 21 in the stacking direction, thereby suppressing the occurrence of elongation and displacement of the positive electrode (positive electrode current collector 11b and positive electrode composite layer 11c) during the manufacture of solid battery 20. Furthermore, second guide member 23 is joined to solid electrolyte layer 11d and first fixing member 11a or second fixing member 11g, thereby suppressing the occurrence of elongation and displacement of the negative electrode (negative electrode current collector 11f and negative electrode composite layer 11e) during the manufacture of solid battery 20.

[0030] When negative electrode mixture layer 11e is a lithium metal layer, negative electrode mixture layer 11e does not have to be present in the initial state, that is, solid state battery 20 may be anode-free.

[0031] Second guide member 23 is an elastic member, and first fixing member 11a, second fixing member 11g, and first guide member 22 are each elastic members having a higher Young's modulus than second guide member 23. Therefore, even if negative electrode composite material layer 11e expands and contracts as solid state battery 20 is charged and discharged, the displacement of negative electrode composite material layer 11e is absorbed. Here, first fixing member 11a, second fixing member 11g, and first guide member 22 have a Young's modulus of, for example, 500 MPa or more and less than 5000 MPa, and second guide member 23 has a Young's modulus of, for example, 5 MPa or more and less than 500 MPa.

[0032] The elastic material that forms the first fixing member 11a, the second fixing member 11g, and the first guide member 22 is not particularly limited, but examples thereof include nonwoven fabric and solid electrolyte.

[0033] The second guide member 23 is not particularly limited, but may be, for example, a spring.

[0034] FIG. 4 shows a modified example of the solid-state battery 20.

[0035] Solid state battery 20A has the same configuration as solid state battery 20, except that the arrangement of positive electrode current collector 11b, positive electrode composite layer 11c, and first guide member 22 is reversed from that of negative electrode current collector 11f, negative electrode composite layer 11e, and second guide member 23. That is, electrode stack 21A has positive electrode current collector 11b, positive electrode composite layer 11c, solid electrolyte layer 11d, negative electrode composite layer 11e, negative electrode current collector 11f, negative electrode composite layer 11e, solid electrolyte layer 11d, positive electrode composite layer 11c, positive electrode current collector 11b, and second fixing member 11g stacked in this order on first fixing member 11a. In addition, a second guide member 23A is arranged around the outer periphery of negative electrode composite layer 11e, negative electrode current collector 11f, and negative electrode composite layer 11e, and a first guide member 22A is arranged around the outer periphery of positive electrode current collector 11b and positive electrode composite layer 11c.

[0036] FIG. 5 shows another example of the solid state battery of this embodiment.

[0037] The solid-state battery 30 is similar to the solid-state battery 20, except that multiple electrode stacks 21 are stacked, and a first guide member 12 and a second guide member 13 (see FIG. 1) are used instead of the first guide member 22 and the second guide member 23.

[0038] 6 and 7 show a method for manufacturing a solid state battery 10 as an example of a method for manufacturing a solid state battery according to this embodiment.

[0039] The manufacturing method of the solid-state battery 10 includes a first arrangement step of arranging a first guide member 12 (see FIG. 6(a)) on a first fixing member 11a, and a second arrangement step of arranging a positive electrode current collector 11b (see FIG. 6(b)) and a positive electrode composite layer 11c (see FIG. 6(c)) in an area of ​​the first fixing member 11a where the first guide member 12 is not arranged. Note that in the second arrangement step, a positive electrode in which the positive electrode composite layer 11c is formed in advance on the positive electrode current collector 11b is used, but FIGS. 6(b) and 6(c) are shown to clarify the arrangement of the components constituting the positive electrode. Here, the first fixing member 11a, the positive electrode current collector 11b, and the positive electrode composite layer 11c are rectangular. The positive electrode current collector 11b and the positive electrode composite layer 11c have the same area, and a positive electrode tab 41 extends from the positive electrode current collector 11b. Furthermore, the first guide member 12 has an inner periphery formed to correspond to the shape of the outer periphery of the positive electrode current collector 11b and the positive electrode tab 41.

[0040] The manufacturing method of the solid-state battery 10 may further include, between the first arrangement step and the second arrangement step, a temporary bonding step of temporarily bonding the first fixing member 11a and the first guide member 12. The temporary bonding method in the temporary bonding step is not particularly limited, but examples thereof include pressure bonding.

[0041] The method for manufacturing solid state battery 10 includes a third disposing step of disposing solid electrolyte layer 11d (see FIG. 6(d)) on first guide member 12 and positive electrode composite layer 11c, and a fourth disposing step of disposing second guide member 13 (see FIG. 7(a)) on solid electrolyte layer 11d. Here, solid electrolyte layer 11d has a rectangular shape, and first fixing member 11a and solid electrolyte layer 11d have the same area.

[0042] The manufacturing method of the solid state battery 10 may further include a temporary bonding step of temporarily bonding the first guide member 12 and the solid electrolyte layer 11d between the third arrangement step and the fourth arrangement step. The temporary bonding method in the temporary bonding step is not particularly limited, but examples thereof include pressure bonding.

[0043] The method for manufacturing solid-state battery 10 includes a fifth arrangement step of arranging a negative electrode composite layer 11e (see FIG. 7(b)) and a negative electrode current collector 11f (see FIG. 7(c)) in an area on solid electrolyte layer 11d where second guide member 13 is not arranged. Note that in the fifth arrangement step, a negative electrode in which a negative electrode composite layer 11e is formed in advance on negative electrode current collector 11f is used, but FIGS. 7(b) and 7(c) are shown to clarify the arrangement of the components constituting the negative electrode. Here, negative electrode composite layer 11e and negative electrode current collector 11f are rectangular. Furthermore, negative electrode composite layer 11e and negative electrode current collector 11f have the same area, and a negative electrode tab 51 extends from negative electrode current collector 11f. Furthermore, second guide member 13 has an inner periphery formed to correspond to the shapes of the outer peripheries of negative electrode composite layer 11e and negative electrode current collector 11f.

[0044] The method for manufacturing the solid state battery 10 may further include, between the fourth arrangement step and the fifth arrangement step, a temporary bonding step of temporarily bonding the solid electrolyte layer 11d and the second guide member 13. The temporary bonding method in the temporary bonding step is not particularly limited, but examples thereof include pressure bonding.

[0045] The method for manufacturing solid state battery 10 includes a sixth arranging step of arranging second fixing member 11g (FIG. 7(d)) ​​on second guide member 13 and negative electrode composite layer 11e, and a joining step of joining first guide member 12 to first fixing member 11a and solid electrolyte layer 11d, and joining second guide member 13 to solid electrolyte layer 11d and second fixing member 11g. Here, second fixing member 11g has a rectangular shape, and second fixing member 11g and solid electrolyte layer 11d have the same area. The joining method in the joining step is not particularly limited, but examples include pressure joining.

[0046] The solid state battery 10A can be manufactured in the same manner as the solid state battery 10, except that the order of the third and fourth arrangement steps is reversed.

[0047] Furthermore, the solid-state batteries 20 and 30 can be manufactured in the same manner as the solid-state battery 10. Here, the solid-state batteries 20 and 30 may be manufactured by first fabricating three components and then stacking the three components as follows. First, a component is fabricated in which the negative electrode current collector 11f and the negative electrode composite layer 11e are sequentially stacked on the first fixing member 11a, and the second guide member 23 is disposed on the outer periphery of the negative electrode current collector 11f and the negative electrode composite layer 11e. Similarly, a component is fabricated in which the negative electrode current collector 11f and the negative electrode composite layer 11e are sequentially stacked on the second fixing member 11g, and the second guide member 23 is disposed on the outer periphery of the negative electrode current collector 11f and the negative electrode composite layer 11e. Furthermore, a member is fabricated in which a positive electrode composite layer 11c, a positive electrode current collector 11b, a positive electrode composite layer 11c, and a solid electrolyte layer 11d are sequentially stacked on a solid electrolyte layer 11d, and a first guide member 22 is arranged on the outer periphery of the positive electrode composite layer 11c, the positive electrode current collector 11b, and the positive electrode composite layer 11c.

[0048] Furthermore, solid-state battery 20A can be manufactured in the same manner as solid-state battery 20, except that the arrangement of positive electrode current collector 11b, positive electrode composite layer 11c, and first guide member 22, and the arrangement of negative electrode current collector 11f, negative electrode composite layer 11e, and second guide member 23 are reversed.

[0049] Hereinafter, a case where the solid-state battery of this embodiment is an all-solid-state lithium secondary battery will be described.

[0050] The positive electrode current collector is not particularly limited, but may be, for example, aluminum foil.

[0051] The positive electrode mixture layer contains a positive electrode active material, and may further contain a solid electrolyte, a conductive additive, a binder, and the like.

[0052] The positive electrode active material is not particularly limited as long as it can absorb and release lithium ions. For example, LiCoO2, Li(Ni 5 / 10 Co 2 / 10 Mn 3 / 10 )O 2、 Li(Ni) 6 / 10 Co 2 / 10 Mn 2 / 10 )O 2、 Li(Ni) 8 / 10 Co 1 / 10 Mn 1 / 10 )O 2、 Li(Ni) 0.8 Co 0.15 Al 0.05 )O 2、 Li(Ni) 1 / 6 Co 4 / 6 Mn 1 / 6 )O 2、 Li(Ni) 1 / 3 Co 1 / 3 Mn 1 / 3 )O 2、 Examples include LiCoO4, LiMn2O4, LiNiO2, LiFePO4, lithium sulfide, and sulfur.

[0053] The solid electrolyte layer can be obtained, for example, by impregnating a nonwoven fabric with a solid electrolyte.

[0054] The solid electrolyte is not particularly limited as long as it is a material capable of conducting lithium ions, and examples thereof include oxide-based electrolytes and sulfide-based electrolytes.

[0055] The negative electrode mixture layer contains a negative electrode active material, and may further contain a solid electrolyte, a conductive additive, a binder, and the like.

[0056] The negative electrode active material is not particularly limited as long as it is capable of absorbing and releasing lithium ions, and examples thereof include metallic lithium, lithium alloys, metal oxides, metal sulfides, metal nitrides, Si, SiO, carbon materials, etc. Examples of carbon materials include artificial graphite, natural graphite, hard carbon, soft carbon, etc.

[0057] The negative electrode current collector is not particularly limited, but examples thereof include copper foil.

[0058] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments may be modified as appropriate within the scope of the spirit of the present invention. [Explanation of symbols]

[0059] 10, 10A, 20, 20A, 30 solid state battery 11, 11A, 21, 21A Electrode laminate 11a First fixing member 11b Positive electrode current collector 11c Positive electrode composite layer 11d Solid electrolyte layer 11e Negative electrode composite layer 11f Negative electrode current collector 11g Second fixing member 12, 22, 22A First guide member 13, 13A, 23, 23A Second guide member 41 Positive electrode tab 51 Negative electrode tab

Claims

1. an electrode stack in which a first electrode mixture layer, a solid electrolyte layer, a second electrode mixture layer, and a second fixing member are sequentially stacked on a first fixing member; a first guide member is disposed on an outer periphery of the first electrode mixture layer; a second guide member is disposed on an outer periphery of the second electrode mixture layer, the first guide member is bonded to the solid electrolyte layer and / or the first fixing member, the second guide member is bonded to the solid electrolyte layer and / or the second fixing member.

2. at least one of the solid electrolyte layer, the first fixing member, the second fixing member, the first guide member, and the second guide member includes a nonwoven fabric; a content of the nonwoven fabric in the solid electrolyte layer is equal to or less than a content of the nonwoven fabric in the first fixing member, equal to or less than a content of the nonwoven fabric in the second fixing member, equal to or less than a content of the nonwoven fabric in the first guide member, and equal to or less than a content of the nonwoven fabric in the second guide member; 2. The solid-state battery according to claim 1, wherein an average fiber diameter of the nonwoven fabric in the solid electrolyte layer is equal to or less than an average fiber diameter of the nonwoven fabric in the first fixing member, equal to or less than an average fiber diameter of the nonwoven fabric in the second fixing member, equal to or less than an average fiber diameter of the nonwoven fabric in the first guide member, and equal to or less than an average fiber diameter of the nonwoven fabric in the second guide member.

3. the solid electrolyte layer, the first fixing member, the second fixing member, the first guide member, and the second guide member each contain a binder; 2. The solid state battery according to claim 1, wherein a content of the binder in the solid electrolyte layer is equal to or less than a content of the binder in the first fixing member, equal to or less than a content of the binder in the second fixing member, equal to or less than a content of the binder in the first guide member, and equal to or less than a content of the binder in the second guide member, respectively.

4. the first electrode mixture layer and the second electrode mixture layer are a positive electrode mixture layer and a negative electrode mixture layer, respectively; the second guide member is an elastic member, The solid-state battery according to claim 1 , wherein the first fixing member, the second fixing member, and the first guide member are each made of an elastic member having a Young's modulus higher than that of the second guide member.

5. A method for manufacturing the solid-state battery according to claim 1, comprising: a first placement step of placing the first guide member on the first fixed member; a second disposing step of disposing the first electrode mixture layer in an area of ​​the first fixing member where the first guide member is not disposed; a third disposing step of disposing the solid electrolyte layer on the first guide member and the first electrode mixture layer; a fourth disposing step of disposing the second guide member on the solid electrolyte layer; a fifth disposing step of disposing the second electrode mixture layer in an area on the solid electrolyte layer where the second guide member is not disposed; a sixth placing step of placing the second fixing member on the second guide member and the second electrode mixture layer; a joining step of joining the first guide member to the solid electrolyte layer and / or the first fixing member, and joining the second guide member to the solid electrolyte layer and / or the second fixing member.

6. The method for manufacturing a solid-state battery according to claim 5 , further comprising a temporary joining step of temporarily joining the first fixing member and the first guide member between the first arranging step and the second arranging step.

7. The method for manufacturing a solid-state battery according to claim 5 , further comprising a temporary bonding step of temporarily bonding the first guide member and the solid electrolyte layer between the third arranging step and the fourth arranging step.

8. The method for manufacturing a solid-state battery according to claim 5 , further comprising a temporary joining step of temporarily joining the solid electrolyte layer and the second guide member between the fourth placing step and the fifth placing step.

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