Solid electrolyte sheet manufacturing jig

Abstract

To provide a manufacturing tool capable of producing a thin and uniform solid electrolyte sheet.SOLUTION: The manufacturing tool 1 for the solid electrolyte sheet 31 is the manufacturing tool 1 for the solid electrolyte sheet 31 configured such that the porous base 33 is filled with the solid electrolyte material. The manufacturing tool 1 includes the first frame member 40 and the second frame member 50 each having the opposing sandwiching portions 46, 56 and sandwiching the base 33 by the sandwiching portions 46, 56. The sandwiching portions 46, 56 provide the fixing structure that can apply tension to the sandwiched base 33.SELECTED DRAWING: Figure 6B

Description

[Technical Field]

[0001] The present invention relates to a manufacturing jig for a solid electrolyte sheet. [Background technology]

[0002] Conventionally, secondary batteries, such as lithium-ion batteries, which can be repeatedly charged and discharged, have been widely used. However, because these types of secondary batteries use an electrolyte solution such as an organic solvent as an ion transfer medium, they have issues such as electrolyte leakage and thermal safety. Therefore, solid-state batteries that use inorganic solid electrolytes instead of organic electrolytes have been proposed and are currently being developed.

[0003] Typically, a solid-state battery has a structure in which a solid electrolyte layer is sandwiched between a positive electrode and a negative electrode. For example, the solid electrolyte layer of a lithium-ion solid-state battery has the function of conducting lithium ions and the function of a separator that prevents short circuits between the positive electrode active material layer in the positive electrode and the negative electrode active material layer in the negative electrode. The solid electrolyte layer that serves as the separator is preferably formed as thin as possible to improve energy density, but at the same time, it is desirable that the layer be strong enough to prevent cracks and the like.

[0004] In response to this demand, a solid electrolyte sheet has been proposed in which a support having openings is used and the openings are filled with a solid electrolyte (see Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-127982 Summary of the Invention [Problem to be solved by the invention]

[0006] As described in Patent Document 1, a solid electrolyte sheet is manufactured by coating a substrate such as a support with a slurry containing a solid electrolyte material. However, if the substrate has wrinkles or slack, the thickness of the manufactured solid electrolyte sheet will vary greatly. If a cell is made using a sheet-like substrate with varying thickness, the variation in thickness will result in a decrease in battery performance.

[0007] An object of the present invention is to provide a manufacturing jig that can manufacture a solid electrolyte sheet that is thin and uniform in thickness. [Means for solving the problem]

[0008] (1) The present invention relates to a manufacturing jig for a solid electrolyte sheet in which a porous substrate is filled with a solid electrolyte material, the manufacturing jig comprising a first frame member and a second frame member each having opposing clamping portions that clamp the substrate, and each of the clamping portions having a fixing structure that can apply tension to the clamped substrate.

[0009] (2) The fixing structure is preferably a concave-convex structure.

[0010] (3) It is preferable that the uneven structure includes continuous convex portions provided on the clamping portion of the first frame member and concave portions provided on the clamping portion of the second frame member, into which the convex portions can fit when the base material is sandwiched. [Effects of the Invention]

[0011] According to the present invention, a solid electrolyte sheet having a thin and uniform thickness can be produced. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a manufacturing jig according to an embodiment of the present invention. [Figure 2]FIG. 1 is a partial cross-sectional view of a solid-state battery including a solid electrolyte sheet manufactured using a manufacturing jig according to an embodiment of the present invention. [Figure 3] FIG. 1 is a perspective view schematically illustrating the structure of a solid electrolyte sheet manufactured using a manufacturing jig according to an embodiment of the present invention. [Figure 4] 2 is a development view of a first frame member and a second frame member that constitute a manufacturing jig according to one embodiment of the present invention. FIG. [Figure 5] 2 is a partial cross-sectional view of a manufacturing jig according to an embodiment of the present invention taken along line AA in FIG. 1. [Figure 6A] FIG. 2 is a partial cross-sectional view of a manufacturing jig according to an embodiment of the present invention taken along line BB in FIG. 1, showing a state in which a substrate is placed between a first frame member and a second frame member spaced apart from each other. [Figure 6B] 2 is a partial cross-sectional view of a manufacturing jig according to one embodiment of the present invention taken along line BB in FIG. 1, showing a state in which a substrate is sandwiched between a first frame member and a second frame member. FIG. [Figure 7] FIG. 2 is a front view schematically showing a substrate clamped by a manufacturing jig according to an embodiment of the present invention. [Figure 8] 1A to 1C are explanatory views schematically illustrating a manufacturing process of a solid electrolyte sheet using a manufacturing jig according to an embodiment of the present invention. [Figure 9] 1 is a graph showing the average thickness and thickness variation of solid electrolyte sheets of Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below are merely examples of the present invention, and the present invention is not limited to the following embodiments.

[0014] Fig. 1 is a perspective view showing a manufacturing jig 1, Fig. 2 is a partial cross-sectional view of a solid state battery 100, and Fig. 3 is a perspective view schematically showing the structure of a solid electrolyte sheet 31. The manufacturing jig 1 according to the embodiment is used to manufacture the solid electrolyte sheet 31 included in the solid state battery 100. Before explaining the manufacturing jig 1, the solid electrolyte sheet 31 manufactured using the manufacturing jig 1 and the solid state battery 100 including the solid electrolyte sheet 31 will be explained.

[0015] As shown in Fig. 1, the solid-state battery 100 includes a positive electrode 10, a negative electrode 20, and a solid electrolyte layer 30. The solid-state battery 100 is a laminate in which the positive electrode 10, the solid electrolyte layer 30, and the negative electrode 20 are laminated in this order. The solid-state battery 100 of the embodiment is a lithium-ion solid-state battery. Note that the term "solid-state battery" as used herein refers to a battery that is fully solidified.

[0016] The positive electrode 10 has a positive electrode layer 11 and a positive electrode current collector 12. The positive electrode layer 11 is disposed on the side of the solid electrolyte layer 30. The positive electrode current collector 12 forms the surface of the solid battery 100 on the positive electrode 10 side.

[0017] The positive electrode layer 11 includes a positive electrode active material. The positive electrode active material used in the positive electrode layer 11 is not particularly limited, and may be any material that functions as a positive electrode of the solid-state battery 100. Specific examples of the positive electrode active material include sulfide-based materials such as titanium sulfide (TiS2), molybdenum sulfide (MoS2), iron sulfide (FeS, FeS2), copper sulfide (CuS), and nickel sulfide (Ni3S2). Also, examples of oxide-based materials include bismuth oxide (Bi2O3), bismuth lead oxide (Bi2Pb2O5), copper oxide (CuO), and vanadium oxide (VO). 13 ), lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium manganese oxide (LiMnO2), Li(NiCoMn)O2, Li(NiCoAl)O2, Li(NiCo)O2, etc. These can also be used in combination.

[0018] The positive electrode current collector 12 has a function of collecting current from the positive electrode layer 11. The positive electrode current collector 12 is a foil-shaped member made of a conductive electrode material. The electrode material used for the positive electrode current collector 12 is not particularly limited as long as it is a conductive material, and examples thereof include vanadium, aluminum, stainless steel, gold, platinum, manganese, iron, and titanium, with aluminum being preferred. The shape and thickness of the positive electrode current collector 12 are not particularly limited as long as they are capable of collecting current from the positive electrode layer 11.

[0019] The negative electrode 20 has a negative electrode layer 21 and a negative electrode current collector 22. The negative electrode layer 21 is disposed on the solid electrolyte layer 30 side. The negative electrode current collector 22 forms the surface of the solid battery 100 on the negative electrode 20 side.

[0020] The negative electrode layer 21 includes a negative electrode active material. The negative electrode active material used in the negative electrode layer 21 is not particularly limited as long as it functions as the negative electrode of the solid-state battery 100. However, it is preferable that the negative electrode active material include at least one of a Li-based material and a Si-based material. Specific examples of the negative electrode active material include carbon materials, specifically, artificial graphite, graphite carbon fiber, resin-baked carbon, pyrolytic vapor-grown carbon, coke, mesocarbon microbeads (MCMB), furfuryl alcohol resin-baked carbon, polyacene, pitch-based carbon fiber, vapor-grown carbon fiber, natural graphite, and non-graphitizable carbon. Alternatively, a mixture of these materials may be used. Examples of the negative electrode active material include metals such as lithium metal, indium metal, aluminum metal, and silicon metal, or alloys of these metals with other elements or compounds.

[0021] The negative electrode current collector 22 has a function of collecting current from the negative electrode layer 21. The negative electrode current collector 22 is a foil-shaped member made of an electrically conductive electrode material. The electrode material used for the negative electrode current collector 22 is not particularly limited as long as it is an electrically conductive material, and examples thereof include vanadium, stainless steel, manganese, iron, titanium, copper, nickel, cobalt, and zinc. Among these, copper and nickel are preferred because of their excellent electrical conductivity and current collection properties. The shape and thickness of the negative electrode current collector 22 are not particularly limited as long as they are capable of collecting current from the negative electrode layer 21.

[0022] The solid electrolyte layer 30 includes a solid electrolyte sheet 31. The solid electrolyte sheet 31 is a sheet in which a sheet-like porous substrate 33 is filled with a solid electrolyte material. As shown in FIG. 3 , the solid electrolyte sheet 31 includes a solid electrolyte 32, a porous substrate 33 disposed in the solid electrolyte 32, and a binder (not shown) mixed in the solid electrolyte 32. The solid electrolyte 32 includes a portion formed by binding the solid electrolyte material with the binder. The solid electrolyte 32 may also include a portion that does not include a binder. The solid electrolyte layer 30 including the solid electrolyte sheet 31 is disposed between the positive electrode 10 and the negative electrode 20.

[0023] The porous substrate 33 is preferably a woven or nonwoven fabric. Woven or nonwoven fabrics have appropriate porosity and thickness, making them easy to fill with the solid electrolyte material. The material of the substrate 33 is not particularly limited, and any material capable of forming a self-supporting sheet may be used. Examples include polyethylene terephthalate, nylon, aramid, Al2O3, and glass. Furthermore, the substrate 33 is preferably made of heat-resistant fibers. By using heat-resistant fibers for the substrate 33, short circuits can be suppressed even when pressing is performed at high temperatures, such as above 200°C, during the manufacturing process of the solid-state battery 100. Furthermore, the solid electrolyte 32 can be sintered by high-temperature pressing, which reduces interfacial resistance and improves battery output.

[0024] The substrate 33 constituting the solid electrolyte sheet 31 of the present invention is preferably made of aramid fiber or Al2O3 fiber among heat-resistant fibers, since deformation of the fiber due to heat is reduced if the aramid fiber or Al2O3 fiber is used.

[0025] The solid electrolyte material used for the solid electrolyte sheet 31 is not particularly limited as long as it is capable of conducting lithium ions between the positive electrode 10 and the negative electrode 20. Examples of the solid electrolyte material include oxide-based electrolytes and sulfide-based electrolytes. The solid electrolyte material used for the solid electrolyte sheet 31 may be the same as the sulfide-based electrolyte used for the positive electrode layer 11.

[0026] The solid electrolyte 32 of the solid electrolyte sheet 31 preferably contains lithium element. Among them, a substance containing at least lithium sulfide as a first component and synthesized from one or more compounds selected from the group consisting of silicon sulfide, phosphorus sulfide, and boron sulfide as a second component is preferred, and Li2S-P2S5 is particularly preferred from the viewpoint of lithium ion conductivity.

[0027] When the solid electrolyte 32 of the solid electrolyte sheet 31 is a sulfide-based electrolyte, it may further contain sulfides such as SiS, GeS, and B. Furthermore, LiPO, halogens, halogen compounds, and the like may be added to the solid electrolyte 32 as appropriate.

[0028] When the solid electrolyte 32 of the solid electrolyte sheet 31 is a lithium ion conductor made of an inorganic compound, for example, Li3N, LISICON, LIPON (Li 3+y PO 4-x N x ), Thio-LISICON(Li 3.25 Ge 0.25 P 0.75 S4), Li2O-Al2O3-TiO2-P2O5 (LATP), etc.

[0029] The solid electrolyte 32 of the solid electrolyte sheet 31 may have an amorphous, glassy, ​​crystalline (crystallized glass) structure, etc. When the solid electrolyte 32 is a sulfide-based solid electrolyte made of Li2S-P2S5, the lithium ion conductivity of the amorphous body is 10 -4 Scm -1 On the other hand, the lithium ion conductivity of the crystalline material is about 10 -3 Scm -1 That's about it.

[0030] The solid electrolyte 32 of the solid electrolyte sheet 31 preferably contains at least one of phosphorus and sulfur, which can improve the ionic conductivity of the resulting solid state battery 100.

[0031] The binder is capable of adhering to the surface of the substrate 33 and adhering the solid electrolyte material. A binder containing, for example, an adhesive resin exhibiting adhesiveness is preferable. Examples of the solid electrolyte material include (meth)acrylic thermoplastic resins, silicone resins, urethane resins, nitrile resins, polyester resins, cellulose resins, styrene resins, styrene-butadiene resins, vinyl acetate resins, fluoroethylene resins, polyvinyl ether, and rubber. Note that "(meth)acrylic" is a general term for acrylic and methacrylic.

[0032] Next, the manufacturing jig 1 for the solid electrolyte sheet 31 will be described with reference to Figures 1 and 4. Figure 4 is a development view of the first frame member 40 and the second frame member 50 that constitute the manufacturing jig 1.

[0033] The manufacturing jig 1 includes a first frame member 40, a second frame member 50, and a hanger 70. The manufacturing jig 1 is formed so as to be able to clamp the base material 33 with the first frame member 40 and the second frame member 50 overlapping each other.

[0034] The first frame member 40 is formed into a rectangular frame shape by an upper frame portion 41, a lower frame portion 42, and vertical frame portions 43 and 44, each of which is an elongated flat plate. The lower frame portion 42 has approximately the same length as the upper frame portion 41 and is formed approximately parallel to and spaced apart from the upper frame portion 41. The vertical frame portion 43 is formed to extend from one longitudinal end of the upper frame portion 41 to one longitudinal end of the lower frame portion 42. The vertical frame portion 44 is formed to extend from the other longitudinal end of the upper frame portion 41 to the other longitudinal end of the lower frame portion 42. In other words, the vertical frame portion 44 is formed approximately parallel to and spaced apart from the vertical frame portion 43. The first frame member 40 also has an opening 45 surrounded by the upper frame portion 41, the lower frame portion 42, and the vertical frame portions 43 and 44.

[0035] At the four corners of the first frame member 40, through-holes 48 are formed that penetrate through the first frame member 40 in the thickness direction and through which the bolts 2 can be inserted.

[0036] The first frame member 40 has a clamping portion 46 formed on an opposing surface 47 that faces the second frame member 50 when the first frame member 40 is placed on top of the second frame member 50, and that clamps the base material 33. The configuration of the clamping portion 46 will be described later.

[0037] The second frame member 50 is formed into a rectangular frame shape by an upper frame portion 51, a lower frame portion 52, and vertical frame portions 53 and 54, each of which is an elongated flat plate. The lower frame portion 52 has approximately the same length as the upper frame portion 51 and is formed approximately parallel to and spaced apart from the upper frame portion 51. The vertical frame portion 53 is formed to extend from one longitudinal end of the upper frame portion 51 (the right end in FIG. 1 ) to one longitudinal end of the lower frame portion 52. The vertical frame portion 54 is formed to extend from the other longitudinal end of the upper frame portion 51 (the left end in FIG. 1 ) to the other longitudinal end of the lower frame portion 52. In other words, the vertical frame portion 54 is formed approximately parallel to and spaced apart from the vertical frame portion 53. The second frame member 50 also has an opening 55 surrounded by the upper frame portion 51, the lower frame portion 52, and the vertical frame portions 53 and 54. The second frame member 50 is formed to have approximately the same size as the first frame member 40.

[0038] At the four corners of the second frame member 50, through holes 58 are formed that penetrate the second frame member 50 in the thickness direction and through which the bolts 2 can be inserted. Each of the four through holes 58 is formed so as to overlap with a through hole 48 when the first frame member 40 and the second frame member 50 are overlapped.

[0039] The second frame member 50 has a clamping portion 56 formed on an opposing surface 57 that faces the first frame member 40 when the first frame member 40 is placed on top of the first frame member 40, and that clamps the base material 33. The first frame member 40 and the second frame member 50 clamp the base material 33 between these clamping portions 46, 56. The configuration of the clamping portion 56 will be described later.

[0040] The hanger 70 is a portion for holding and suspending the manufacturing jig 1. The hanger 70 is attached to the upper surface of the upper frame portion 51 of the second frame member 50.

[0041] Next, the configuration of the clamping sections 46, 56 will be described with reference to FIGS. 4 to 7. FIG. 5 is a partial cross-sectional view of the manufacturing jig 1 taken along line AA in FIG. 1. FIGS. 6A and 6B are partial cross-sectional views of the manufacturing jig 1 taken along line BB in FIG. 1. FIG. 6A shows a state in which the base material 33 is placed between the first frame member 40 and the second frame member 50 that are spaced apart from each other. FIG. 6B shows a state in which the base material 33 is clamped between the first frame member 40 and the second frame member 50.

[0042] As shown in Figures 5 and 6A, the clamping portion 46 is formed by a convex portion 61 protruding from the opposing surface 47, inner surfaces 461 formed on both sides of the convex portion 61 in the width direction of the first frame member 40, and an outer surface 462.

[0043] The protrusions 61 are provided so as to extend continuously in the length direction of the upper frame portion 41, the lower frame portion 42, and the vertical frame portions 43, 44 on the opposing surface 47. That is, the protrusions 61 are provided continuously along the shape of the first frame member 40. As shown in FIGS. 5 to 6B, the protrusions 61 are provided on the center side of the first frame member 40 in the width direction.

[0044] The inner surface 461 is provided on the opening 45 side in the width direction of the first frame member 40. The outer surface 462 is provided on the outer side (opposite the opening 45) in the width direction of the first frame member 40. The thicknesses of the portions of the first frame member 40 where the inner surface 461 and the outer surface 462 are formed are approximately the same, and are formed thinner than the protrusion 61. That is, the protrusion 61 is formed so as to protrude toward the clamping portion 56 from the plane formed by the inner surface 461 and the outer surface 462 when the base material 33 is clamped by the clamping portions 46, 56 as shown in FIG. 6B .

[0045] As shown in FIG. 6A, the clamping portion 56 is formed by a recess 62 formed in the opposing surface 57, and inner and outer surfaces 561 and 562 formed on both sides of the recess 62 in the width direction of the second frame member 50.

[0046] The recesses 62 are provided in the clamping portion 56 so as to be able to fit with the protrusions 61 in a state in which the base material 33 is sandwiched between them. Specifically, the recesses 62 are provided so as to extend continuously in the length direction of the upper frame portion 51, the lower frame portion 52, and the vertical frame portions 53, 54 on the opposing surface 57. In other words, the recesses 62 are provided continuously along the shape of the second frame member 50. Furthermore, as shown in FIGS. 5 to 6B, the recesses 62 are provided on the center side in the width direction of the second frame member 50.

[0047] The inner surface 561 is provided on the opening 55 side in the width direction of the second frame member 50. The outer surface 562 is provided on the outer side (opposite the opening 55) in the width direction of the second frame member 50. The thicknesses of the portions of the second frame member 50 that form the inner surface 561 and the outer surface 562 are approximately the same, and are formed to be thicker than the recessed portion 62. That is, the recessed portion 62 is formed so as to be recessed from the plane formed by the inner surface 561 and the outer surface 562 toward the opposite side to the clamping portion 46 side when the base material 33 is clamped by the clamping portions 46, 56 as shown in FIG. 6B .

[0048] Next, the state of the substrate 33 held by the manufacturing jig 1 will be described with reference to Figures 6A to 7. Figure 7 is a front view schematically showing the substrate 33 held by the manufacturing jig 1.

[0049] As shown in FIG. 6A , the substrate 33 before being filled with the solid electrolyte material is in an untensioned state, with some sagging. As shown in FIG. 6B , by clamping the substrate 33 between the clamping units 46 and 56, the substrate 33 can be pulled into the portion where the convex portions 61 and concave portions 62 fit together, and tension is applied in the direction of the white arrow. That is, each of the clamping units 46 and 56 includes a convex-concave structure 60, which includes a convex portion 61 and a concave portion 62 and serves as a fixing structure capable of applying tension to the clamped substrate 33. As shown in FIG. 7 , the portion of the substrate 33 exposed through the openings 45 and 55 clamped in the manufacturing jig 1 is tensioned outward in the planar direction, as indicated by the white arrow, by the convex-concave structure 60 having the convex portions 61 and the concave portions 62. This prevents the substrate 33 from wrinkling or sagging.

[0050] Next, a method for manufacturing the solid electrolyte sheet 31 using the manufacturing jig 1 according to this embodiment will be described. Fig. 8 is an explanatory diagram schematically showing the manufacturing process of the solid electrolyte sheet 31 using the manufacturing jig 1.

[0051] First, the base material 33 is placed between the first frame member 40 and the second frame member 50, and with the first frame member 40 and the second frame member 50 overlapping each other, the bolts 2 are screwed into the through holes 48, 58. As a result, the base material 33 is attached to the manufacturing jig 1 with tension applied, as shown in Fig. 8(A).

[0052] As shown in FIG. 8(B), the substrate 33 attached to the manufacturing jig 1 is immersed in the immersion tank 4 into which the solid electrolyte slurry 3 has been introduced. At this time, the solid electrolyte slurry 3 adheres to the substrate 33 through the openings 45 and 55. After a predetermined time has elapsed, the substrate 33 is pulled out and immersed again in the immersion tank 4. This operation is repeated a predetermined number of times. The solid electrolyte slurry 3 is prepared by mixing a solid electrolyte material and a binder in a slurry liquid such as butyl acetate.

[0053] Next, as shown in FIG. 8(C), the manufacturing jig 1 having the base material 33 coated with the solid electrolyte slurry 3 attached thereto is hung on a drying rack 5 by a hanger 70, and dried.

[0054] After a predetermined time has elapsed, the manufacturing jig 1 is removed from the drying rack 5, and the substrate 33 is removed from the manufacturing jig 1, thereby producing a solid electrolyte sheet 31 in which the substrate 33 is filled with the solid electrolyte material, as shown in FIG. 8(D). [Example]

[0055] Next, examples of the present invention will be described, but the present invention is not limited to these examples.

[0056] In the example, an evaluation test was carried out to evaluate the variation in thickness of the solid electrolyte sheet obtained using the manufacturing jig 1 according to this embodiment.

[0057] As examples, three rectangular samples of solid electrolyte sheets were produced by the manufacturing method of the solid electrolyte sheet 31 described above using the manufacturing jig 1 of this embodiment. As comparative examples, three rectangular samples of solid electrolyte sheets were produced by the same method as in the examples, except that a manufacturing jig different from the manufacturing jig 1 used in the examples was used. The manufacturing jig used in the comparative examples differs from the manufacturing jig 1 in that the uneven structure 60 is not formed on the clamping portions 46, 56. Specifically, the manufacturing jig used in the comparative examples has opposing surfaces 47, 57 including the clamping portions 46, 56 formed flat. That is, the comparative examples use a manufacturing jig that, unlike the manufacturing jig 1, does not have the function of applying tension to the substrate.

[0058] The average thickness of the solid electrolyte sheet was measured at four points in total, near the four corners of each sample, and the average thickness (μm) and standard deviation (σ) of the film thickness of each sample were calculated.

[0059] 9 is a graph showing the average thickness and thickness variation of the solid electrolyte sheets of the Example and Comparative Example. The horizontal axis of FIG. 9 shows the sample numbers of the three samples of the Example and Comparative Example, and the vertical axis shows the average thickness (μm) of the solid electrolyte sheet. The standard deviation (σ) of the thickness of each sample is also shown above the bar graph.

[0060] 9, the standard deviation of all samples in the comparative example was 3.0 or more, whereas the standard deviation of the examples was 1.5 or less. This result confirms that the use of the manufacturing jig 1 having the uneven structure 60 reduced the variation in thickness of the manufactured solid electrolyte sheet.

[0061] The manufacturing jig 1 for the solid electrolyte sheet 31 according to the embodiment described above has the following advantages.

[0062] The manufacturing jig 1 for the solid electrolyte sheet 31 according to this embodiment is a manufacturing jig 1 for the solid electrolyte sheet 31 in which a porous substrate 33 is filled with a solid electrolyte material, and includes a first frame member 40 and a second frame member 50, each having opposing clamping portions 46, 56 that clamp the substrate 33 between the clamping portions 46, 56, and each of the clamping portions 46, 56 has a fixing structure that can apply tension to the clamped substrate 33.

[0063] This allows tension to be applied to the substrate 33, thereby preventing wrinkles and sagging of the substrate 33. The solid electrolyte sheet 31 obtained by filling the substrate 33 in this state with a solid electrolyte material has a thin thickness, with reduced thickness variation, and the density of the solid electrolyte layer 30 tends to be uniform. As a result, when the solid electrolyte sheets 31 are stacked to form a cell, a uniform thickness distribution is obtained, and deterioration of battery performance can be prevented. This improves energy efficiency.

[0064] In the manufacturing jig 1 for the solid electrolyte sheet 31 according to this embodiment, the fixing structure is a concave-convex structure 60.

[0065] This allows the fixing structure to be simple, and the solid electrolyte sheet 31 with little variation in thickness can be easily obtained at low cost.

[0066] In the manufacturing jig 1 of this embodiment, the uneven structure 60 includes a continuous convex portion 61 provided in the clamping portion 46 of the first frame member 40, and a concave portion 62 provided in the clamping portion 56 of the second frame member 50, into which the convex portion 61 can fit when the substrate 33 is sandwiched.

[0067] This allows the concave-convex structure 60 to be formed with a simple structure, and the solid electrolyte sheet 31 with little variation in thickness can be easily obtained at low cost.

[0068] Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and modifications and improvements made within the scope of the present invention are also included in the scope of the present invention. [Explanation of symbols]

[0069] 1 Manufacturing jig 31 Solid electrolyte sheet 33 Base material 40 First frame member 46,56 Clamping part 50 Second frame member 60 Uneven structure (fixed structure)

Claims

1. A manufacturing jig for a solid electrolyte sheet in which a porous substrate is filled with a solid electrolyte material, a first frame member and a second frame member each having a clamping portion facing each other and clamping the substrate between the clamping portions; each of the clamping units has a fixing structure capable of applying tension to the clamped substrate; the fixing structure is a concave-convex structure, The uneven structure is a protrusion provided on the clamping portion of the first frame member; a recess provided in the clamping portion of the second frame member, the recess being capable of being fitted into the protrusion while the base material is sandwiched between the protrusion and the clamping portion; the protrusions have a protruding amount greater than the thickness of the base material; The manufacturing jig for a solid electrolyte sheet, wherein the depth of the recess is greater than the thickness of the substrate.

2. The convex portion is rectangular in cross section and is provided continuously along the shape of the first frame member, The jig for manufacturing a solid electrolyte sheet according to claim 1 , wherein the recess is provided continuously along the shape of the second frame member.

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