Method of manufacturing all-solid battery

Abstract

To provide a method of manufacturing an all-solid battery, which can easily remove a solvent, in a manufacturing process of the all-solid battery.SOLUTION: A method of manufacturing an all-solid battery comprises a coating step, a removal step, and a press step. In the coating step, a mixture containing a solid particle and a solvent is applied to a coating region of a base material, without coming into contact with a non-coating region of the base material. In the removal step, the solvent is removed from the mixture applied in the coating step. In the press step, the solid particle contained in the mixture, from which the solvent is removed, is press-molded on the base material, and brought into contact with the non-coating region of the base material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] An all-solid-state battery is a secondary battery made of solid materials, including an electrolyte layer, and includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer. In all-solid-state batteries, charging and discharging are generally performed by the movement of lithium ions between the positive electrode layer and the negative electrode layer.

[0003] Patent Document 1 discloses a method for manufacturing an all-solid-state battery by laminating a positive electrode layer in which a positive electrode active material layer is laminated on a positive electrode current collector layer, a solid electrolyte layer, and a negative electrode layer in which a negative electrode active material layer is laminated on a negative electrode current collector layer, and then press-molding the resulting mixture. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-147621 Summary of the Invention [Problem to be solved by the invention]

[0005] In the manufacturing method of an all-solid-state battery described in Patent Document 1, the positive electrode layer is obtained by applying a positive electrode mixture containing a positive electrode active material and a solvent to a positive electrode current collector layer and pressing the applied positive electrode mixture onto the positive electrode current collector layer. Similarly, the negative electrode layer is obtained by applying a negative electrode mixture containing a negative electrode active material and a solvent to a negative electrode current collector layer and pressing the applied negative electrode mixture onto the negative electrode current collector layer. The solid electrolyte layer is obtained by applying a solid electrolyte mixture containing a solid electrolyte and a solvent to a positive electrode layer or a negative electrode layer and pressing the applied solid electrolyte mixture onto the positive electrode layer or a negative electrode layer. In this manufacturing method of an all-solid-state battery, there is a risk that the solvent may remain in the positive electrode layer, the negative electrode layer, or the solid electrolyte layer. For this reason, it is necessary to easily remove the solvent in the manufacturing process of an all-solid-state battery.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing an all-solid-state battery that allows for easy removal of a solvent in the manufacturing process of the all-solid-state battery. [Means for solving the problem]

[0007] In order to achieve the above object, the method for producing an all-solid-state battery according to the present invention includes: a coating step of coating a mixture containing solid particles and a solvent onto a coating region of a substrate without bringing the mixture into contact with a non-coating region of the substrate; a removing step of removing the solvent from the mixture coated in the coating step; and a pressing step of press-molding the solid particles contained in the mixture from which the solvent has been removed onto the substrate, and bringing the solid particles into contact with the non-coating region of the substrate. [Effects of the Invention]

[0008] According to the present invention, the solvent can be easily removed in the manufacturing process of the all-solid-state battery. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an all-solid-state battery according to an embodiment. [Figure 2] 1 is a flowchart illustrating a method for manufacturing an all-solid-state battery according to an embodiment. [Figure 3] FIG. 2 is a diagram showing a positive electrode current collector layer according to the embodiment. [Figure 4] FIG. 1A is a top view showing a positive electrode current collector layer coated with a positive electrode mixture according to an embodiment, and FIG. 1B is a side view showing a positive electrode current collector layer coated with a positive electrode mixture according to an embodiment. [Figure 5] FIG. 1A is a top view showing a positive electrode current collector layer on which a positive electrode active material layer according to an embodiment is laminated, and FIG. 1B is a side view showing a positive electrode current collector layer on which a positive electrode active material layer according to an embodiment is laminated. [Figure 6] 3 is a side view showing a positive electrode current collector layer formed by stacking a solid electrolyte layer and a positive electrode active material layer according to the embodiment. FIG. [Figure 7] 3 is a side view showing a negative electrode current collector layer formed by stacking a solid electrolyte layer and a negative electrode active material layer according to the embodiment. FIG. [Figure 8] 1A is a top view showing a positive electrode current collector layer coated with a positive electrode mixture according to a modified example, and FIG. 1B is a side view showing a positive electrode current collector layer coated with a positive electrode mixture according to a modified example. [Figure 9] FIG. 10 is a diagram showing a positive electrode current collector layer according to a modified example. [Figure 10] FIG. 10 is a diagram showing a positive electrode current collector layer coated with a positive electrode mixture according to a modified example. [Figure 11] FIG. 10 is a top view showing a positive electrode current collector layer coated with a positive electrode mixture and an insulator according to a modified example. [Figure 12] 12(A) is a top view showing a positive electrode current collector layer in which a positive electrode active material layer and an insulating layer according to an embodiment are stacked, and FIG. 12(B) is a cross-sectional view taken along XII-XII in FIG. 12(A). DETAILED DESCRIPTION OF THE INVENTION

[0010] The method for manufacturing an all-solid-state battery according to the present embodiment will be described with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.

[0011] (Embodiment) 1 is a schematic cross-sectional view showing an all-solid-state battery 100 according to an embodiment. First, the all-solid-state battery 100 manufactured by the manufacturing method for an all-solid-state battery according to the present embodiment will be described. The all-solid-state battery 100 is a secondary battery that is charged and discharged by the movement of lithium ions between a positive electrode and a negative electrode.

[0012] As shown in FIG. 1, the all-solid-state battery 100 includes a positive electrode current collector layer 10, a positive electrode active material layer 20, a solid electrolyte layer 30, a negative electrode current collector layer 40, and a negative electrode active material layer 50.

[0013] The positive electrode current collector layer 10 is a conductive plate- or foil-shaped member, and is made of, for example, a metal or a conductive resin, although it is not particularly limited thereto. Examples of metals that can be used include aluminum, nickel, iron, stainless steel, titanium, and copper. Alternatively, a clad material of nickel and aluminum, or a clad material of copper and aluminum may also be used. Examples of conductive resins include resins in which a conductive filler is added to a non-conductive polymer material.

[0014] The positive electrode active material layer 20 may be formed of a material that can release lithium ions during charging and absorb lithium ions during discharging, and may contain at least a positive electrode active material and may further contain a solid electrolyte, a binder, a conductive material, etc. The thickness of the positive electrode active material layer 20 is not particularly limited, but is preferably 10 μm or more and 500 μm or less, and more preferably 50 μm or more and 200 μm or less.

[0015] The positive electrode active material may be, for example, a lithium metal composite oxide. Examples of the lithium metal composite oxide include layered rock salt compounds such as LiCoO2, LiMnO2, LiNiO2, LiVO2, and Li(Ni-Mn-Co)O2; LiMn2O4; and LiNi 0.5 Mn 1.5 Examples of such compounds include spinel-type compounds such as LiFePO4 and LiMnPO4, olivine-type compounds such as LiFeSiO4 and LiMnSiO4, and Si-containing compounds such as LiFeSiO4 and LiMnSiO4. 12 Also, the following can be used.

[0016] The solid electrolyte layer 30 is interposed between the positive electrode active material layer 20 and the negative electrode active material layer 50 and is in contact with the positive electrode active material layer 20 and the negative electrode active material layer 50. The solid electrolyte layer 30 includes a solid electrolyte and may further include a binder or the like. As the solid electrolyte, for example, a sulfide solid electrolyte or an oxide solid electrolyte can be used, and it is preferable to use a sulfide solid electrolyte. The thickness of the solid electrolyte layer 30 is not particularly limited, but is preferably 5 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less.

[0017] Examples of sulfide solid electrolytes include LiI-Li2S-SiS2, LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li2S-P2S5, LiI-Li3PS4, LiI-LiBr-Li3PS4, Li3PS4, Li2S-P2S5, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-B2S3, and Li2S-P2S5-Z. m S n (where m and n are positive numbers, and Z is Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li x MO y (where x and y are positive numbers, and M is any of P, Si, Ge, B, Al, Ga, and In). The term "Li2S-P2S5" refers to a sulfide solid electrolyte obtained using a raw material composition containing Li2S and P2S5, and the same applies to the other terms above. Furthermore, sulfide glass or the like may be used as the sulfide solid electrolyte.

[0018] As the oxide solid electrolyte, for example, a compound having a NASICON structure can be used. Examples of the compound having a NASICON structure include compounds represented by the general formula Li 1+x Al x Ge 2-x Compounds (LAGP) represented by (PO4)3 (0≦x≦2), general formula Li 1+x Al x Ti 2-xA compound (LATP) represented by (PO4)3 (0≦x≦2) can be used. Other oxide solid electrolytes include LiLaTiO (for example, Li 0.34 La 0.51 TiO3), LiPON (e.g., Li 2.9 PO 3.3 N 0.46 ), LiLaZrO (e.g., Li7La3Zr2O 12 ) etc. can be used.

[0019] The negative electrode current collector layer 40 is a conductive plate- or foil-shaped member, and is made of, for example, a metal or a conductive resin, although it is not particularly limited thereto. Examples of metals that can be used include aluminum, nickel, iron, stainless steel, titanium, and copper. Alternatively, a clad material of nickel and aluminum, or a clad material of copper and aluminum may also be used. Examples of conductive resins include resins in which a conductive filler is added to a non-conductive polymer material.

[0020] The negative electrode active material layer 50 is configured to absorb lithium (or precipitate lithium) during charging and release lithium ions during discharging, and contains at least a negative electrode active material, and may further contain a solid electrolyte, a binder, a conductive material, etc. The thickness of the negative electrode active material layer 50 is not particularly limited, but is preferably 1 μm or more and 100 μm or less, and more preferably 5 μm or more and 80 μm or less.

[0021] The type of negative electrode active material is not particularly limited, but examples thereof include carbon materials, metal oxides, and metal active materials. Specific examples of carbon materials include carbon black (specifically, acetylene black, Ketjen Black (registered trademark), furnace black, channel black, thermal lamp black, etc.), carbon nanotubes (CNT), graphite, hard carbon, etc. Among these, carbon black is preferred, and at least one selected from the group consisting of acetylene black, Ketjen Black (registered trademark), furnace black, channel black, and thermal lamp black is more preferred. Furthermore, examples of metal oxides include Nb2O5, Li4Ti5O 12 , SiO, etc. Furthermore, examples of the metal active material include simple metals such as In, Al, Si, and Sn, and alloys such as TiSi and La3Ni2Sn7.

[0022] The negative electrode active material may be a metal containing Li. Such a negative electrode active material is not particularly limited as long as it is an active material containing Li. It may be Li metal or a lithium alloy containing Li. Examples of lithium alloys include alloys of lithium and at least one metal selected from gold (Au), magnesium (Mg), aluminum (Al), calcium (Ca), zinc (Zn), tin (Sn), and bismuth (Bi). The lithium alloy may also be an alloy of lithium and two or more of the above-mentioned metals. Specific examples of lithium alloys include lithium-gold alloy (Li-Au), lithium-magnesium alloy (Li-Mg), lithium-aluminum alloy (Li-Al), lithium-calcium alloy (Li-Ca), lithium-zinc alloy (Li-Zn), lithium-tin alloy (Li-Sn), and lithium-bismuth alloy (Li-Bi).

[0023] Next, a method for manufacturing the all-solid-state battery 100 according to this embodiment will be described.

[0024] Fig. 2 is a flowchart showing a method for manufacturing the all-solid-state battery 100. As shown in Fig. 2, the method for manufacturing the all-solid-state battery 100 includes a preparation step (step S101), an application step (step S102), a removal step (step S103), and a pressing step (step S104). Here, a manufacturing method for laminating a positive electrode active material layer 20 on a positive electrode current collector layer 10 will be described.

[0025] The preparation step (step S101) is a step of mixing the above-described positive electrode active material and a solvent to prepare a positive electrode mixture 21. The positive electrode mixture 21 is a slurry and contains at least a positive electrode active material and a solvent, and preferably further contains a solid electrolyte, a binder, a conductive additive, and the like. Specifically, the positive electrode mixture 21 contains a positive electrode active material, a solvent, and a binder. The solvent contains, for example, anisole. The binder bonds the positive electrode active material and contains, for example, polypropylene carbonate (PPC). This makes it possible to easily laminate the positive electrode active material layer 20 on the positive electrode current collector layer 10. The positive electrode active material is an example of solid particles, and the positive electrode mixture 21 is an example of a mixture.

[0026] The coating step (step S102) is a step of coating the positive electrode mixture 21 prepared in the preparation step (step S101) onto the positive electrode current collector layer 10. FIG. 3 is a diagram showing the coating region 11 and the non-coating region 12 of the positive electrode current collector layer 10. As shown in FIG. 3, the positive electrode current collector layer 10 has the coating region 11 to which the positive electrode mixture 21 is applied and the non-coating region 12 to which the positive electrode mixture 21 is not applied. In this example, the coating region 11 has a vertical line or stripe shape. The width and spacing of the coating regions 11 are not particularly limited, but are set to a width and spacing that increase the surface area of ​​the coated positive electrode mixture 21 so that the solvent can be easily removed from the coated positive electrode mixture 21. The amount of the positive electrode mixture 21 to be applied is determined based on the thickness of the positive electrode active material layer 20 to be laminated. Specifically, the length, width, and height of the stripes and the number of stripes are adjusted so that the volume per unit area of ​​the applied positive electrode mixture 21 is the same as the volume per unit area of ​​the positive electrode active material layer 20 to be laminated. In this case, consideration is given to the reduction in volume caused by the removal of the solvent and excess binder from the positive electrode mixture 21. FIGS. 4(A) and 4(B) are diagrams showing the positive electrode current collector layer 10 to which the positive electrode mixture 21 has been applied. In the application step (step S102), as shown in FIGS. 4(A) and 4(B), the positive electrode mixture 21 is applied to the application region 11 without contacting the non-application region 12. The application method is not particularly limited, and the positive electrode mixture 21 may be applied to the application region 11 by a method such as screen printing.

[0027] The removal step (step S103) is a step of removing the solvent from the positive electrode mixture 21 applied to the positive electrode current collector layer 10 in the application step (step S102). In the removal step (step S103), the solvent is removed from the positive electrode mixture 21 applied to the positive electrode current collector layer 10 by heating. Because the positive electrode mixture 21 is applied in lines or stripes, it has a larger surface area than when applied flatly, allowing the solvent to evaporate more easily, and the solvent and excess binder can be easily removed. In the removal step (step S103), the binder may also be removed. The heating temperature is not particularly limited, but is preferably 80°C or higher and 200°C or lower. This allows the solvent to be easily removed in a short time. In addition, heating is preferably performed in an inert gas atmosphere containing argon or nitrogen or in a vacuum. This prevents deterioration of the positive electrode active material.

[0028] The pressing step (step S104) is a step of pressing the positive electrode active material contained in the positive electrode mixture 21, from which the solvent has been removed, onto the positive electrode current collector layer 10 using a roll press or the like, so that the positive electrode active material comes into contact with the non-coated regions 12 of the positive electrode current collector layer 10. FIGS. 5(A) and 5(B) are diagrams showing the positive electrode current collector layer 10 on which the positive electrode active material layer 20 is laminated. By pressing, the positive electrode mixture 21, which has been applied in a line-like or striped shape, is crushed and extends in the left-right direction to come into contact with the non-coated regions 12, thereby obtaining the positive electrode active material layer 20 laminated on the positive electrode current collector layer 10, as shown in FIGS. 5(A) and 5(B). This results in a positive electrode layer in which the positive electrode active material layer 20 is laminated on the positive electrode current collector layer 10.

[0029] FIG. 6 is a diagram showing a first laminate 61 in which a solid electrolyte layer 30 is laminated on a positive electrode active material layer 20 that is laminated on a positive electrode current collector layer 10. After laminating the positive electrode active material layer 20 on the positive electrode current collector layer 10, as shown in FIG. 6, the solid electrolyte layer 30 is laminated on the positive electrode active material layer 20 that is laminated on the positive electrode current collector layer 10 to produce the first laminate 61. FIG. 7 is a diagram showing a second laminate 62 in which an anode active material layer 50 is laminated on an anode current collector layer 40. Separately, as shown in FIG. 7, the anode active material layer 50 is laminated on the anode current collector layer 40 to produce a second laminate 62 that is an anode layer. By laminating the second laminate 62 on the first laminate 61, the all-solid-state battery 100 shown in FIG. 1 is obtained.

[0030] As described above, according to the manufacturing method of the all-solid-state battery 100 of this embodiment, the positive electrode mixture 21 is applied to the coating region 11 of the positive electrode current collector layer 10 without contacting the non-coating region 12 of the positive electrode current collector layer 10, thereby easily removing the solvent in the manufacturing process of the all-solid-state battery. This is because applying the positive electrode mixture 21 in lines or stripes to the coating region 11 of the positive electrode current collector layer 10 increases the surface area of ​​the positive electrode mixture 21 compared to when the positive electrode mixture 21 is applied flatly, allowing the solvent to be removed in a short time. This prevents the solvent from remaining in the positive electrode active material layer 20 laminated on the positive electrode current collector layer 10. Furthermore, setting the heating temperature to 80°C or higher and 200°C or lower allows the solvent to be easily removed in a short time. Furthermore, heating can be performed in an inert gas atmosphere containing argon or nitrogen or in a vacuum to prevent deterioration of the positive electrode active material. Furthermore, the positive electrode active material layer 20 laminated on the positive electrode current collector layer 10 is obtained by pressing the positive electrode active material contained in the positive electrode mixture 21 from which the solvent has been removed onto the positive electrode current collector layer 10 using a roll press or the like.

[0031] (Variation) The configurations shown in the above embodiments are merely examples, and can be arbitrarily changed or applied.

[0032] For example, in the above embodiment, an example has been described in which the positive electrode mixture 21 is applied to the positive electrode current collector layer 10 in vertical stripes in the application step (step S102), but the pattern is not limited to vertical stripes, and the positive electrode mixture 21 may be applied to the positive electrode current collector layer 10 in a stripe pattern such as horizontal stripes or diagonal stripes. Furthermore, the width and spacing of the stripes may be uniform or non-uniform.

[0033] Furthermore, in the coating step (step S102), the positive electrode mixture 21 may be coated on the coating region 11 of the positive electrode current collector layer 10 without contacting the non-coating region 12 of the positive electrode current collector layer 10. FIGS. 8(A) and 8(B) are views showing a positive electrode current collector layer 10 coated with a positive electrode mixture 21 according to a modified example. For example, as shown in FIGS. 8(A) and 8(B), in the coating step (step S102), the positive electrode mixture 21 having tunnel-shaped grooves 22 formed therein may be coated on the coating region 11 of the positive electrode current collector layer 10 so that the positive electrode mixture 21 does not contact the non-coating region 12 of the positive electrode current collector layer 10. Specifically, the positive electrode mixture 21 having the grooves 22 formed therein is transferred to the positive electrode current collector layer 10, so that the positive electrode mixture 21 is coated on the coating region 11 without contacting the non-coating region 12. In this manner, a tunnel-shaped groove 22 is formed between the positive electrode mixture 21 and the positive electrode current collector layer 10, and similarly to the above embodiment, the surface area of ​​the positive electrode mixture 21 is increased by the amount of the groove 22, and the solvent can be removed in a short time by evaporating from the groove 22.

[0034] FIG. 9 is a diagram showing a coated region 11 and a non-coated region 12 of a positive electrode current collector layer 10 according to a modified example. The positive electrode mixture 21 is not limited to being applied to the positive electrode current collector layer 10 in a line or stripe pattern, and the positive electrode mixture 21 may be applied to the positive electrode current collector layer 10 in any shape other than a line or stripe pattern. For example, as shown in FIG. 9, the positive electrode current collector layer 10 may have dot-shaped coated regions 11 to which the positive electrode mixture 21 is applied and non-coated regions 12 to which the positive electrode mixture 21 is not applied. FIG. 10 is a diagram showing the positive electrode current collector layer 10 to which the positive electrode mixture 21 is applied. As shown in FIG. 10, the positive electrode mixture 21 is applied to the dot-shaped coated regions 11 without contacting the non-coated regions 12. In this case, the surface area of ​​the positive electrode mixture 21 is larger than when the positive electrode mixture 21 is applied in a line or stripe pattern, and the solvent can be removed in a shorter time. In this example, the square dots are arranged in a grid pattern, but the shape and arrangement of the dots are not particularly limited. The dot pattern may be arranged regularly or irregularly, including, for example, staggered or randomly. The dot pattern also includes a checkerboard pattern. The dot shape may be polygonal, circular, elliptical, oval, or other shapes. The positive electrode mixture 21 may have any other shape as long as it can be applied to the application region 11 of the positive electrode current collector layer 10 without contacting the non-application region 12 of the positive electrode current collector layer 10. The shape of the positive electrode mixture 21 applied to the positive electrode current collector layer 10 preferably includes at least a line, stripe, or dot pattern, and may be a combination of line, stripe, groove, and dot shapes. The line shape includes shapes including straight lines or curves, such as radial, grid, concentric circles, and spiral shapes. In the case of dots, grooves, or other elements, the spacing, height, width, and the like of the dots and grooves may be calculated based on the positive electrode active material layer 20 to be laminated.

[0035] In the above embodiment, an example in which the positive electrode active material layer 20 is laminated on the positive electrode current collector layer 10 has been described. However, an insulating layer 72 may be further formed on the positive electrode current collector layer 10. FIG. 11 is a diagram showing the positive electrode current collector layer 10 to which the positive electrode mixture 21 and the insulator 71 are applied. In this case, as shown in FIG. 11, the insulator 71 is applied to the positive electrode current collector layer 10 before the pressing step (step S104). A solid electrolyte may be used as the insulator 71. FIGS. 12(A) and 12(B) are diagrams showing the positive electrode current collector layer 10 to which the insulating layer 72 and the positive electrode active material layer 20 are laminated. When the positive electrode current collector layer 10 to which the positive electrode mixture 21 and the insulator 71 are applied is press-molded, the insulating layer 72 and the positive electrode active material layer 20 laminated on the positive electrode current collector layer 10 are obtained, as shown in FIGS. 12(A) and 12(B). The insulating layer 72 is formed around the positive electrode active material layer 20. This prevents the positive electrode mixture 21 from protruding outward when the positive electrode current collector layer 10 coated with the positive electrode mixture 21 is press-molded. Furthermore, the positive electrode active material layer 20 formed on the positive electrode current collector layer 10 is protected from the outside by the insulating layer 72.

[0036] In the above embodiment, the positive electrode mixture 21 is applied to the coating region 11 of the positive electrode current collector layer 10 without contacting the non-coating region 12 of the positive electrode current collector layer 10. However, the negative electrode mixture may be applied to the coating region of the negative electrode current collector layer 40 without contacting the non-coating region of the negative electrode current collector layer 40. The negative electrode mixture contains a negative electrode active material and a solvent, and may also contain a binder, a solid electrolyte, a conductive additive, etc. This method also allows for easy removal of the solvent during the manufacturing process of the all-solid-state battery. Similarly, when the solid electrolyte layer 30 is laminated on the positive electrode active material layer 20 or the negative electrode active material layer 50, the solid electrolyte may be applied to the coating region of the positive electrode active material layer 20 or the negative electrode active material layer 50 without contacting the solid electrolyte to the non-coating region of the positive electrode active material layer 20 or the negative electrode active material layer 50. This method also allows for easy removal of the solvent during the manufacturing process of the all-solid-state battery.

[0037] The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the above-described embodiments are intended to explain the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is defined by the claims, not by the embodiments. Various modifications made within the scope of the claims and the meaning of the disclosure equivalent thereto are considered to be within the scope of the present invention. [Explanation of symbols]

[0038] DESCRIPTION OF SYMBOLS 10... positive electrode current collector layer, 11... coated region, 12... non-coated region, 20... positive electrode active material layer, 21... positive electrode mixture, 22... groove, 30... solid electrolyte layer, 40... negative electrode current collector layer, 50... negative electrode active material layer, 61... first laminate, 62... second laminate, 71... insulator, 72... insulating layer, 100... all-solid-state battery

Claims

1. a coating step of applying a mixture containing solid particles and a solvent to a coating area of ​​the substrate without contacting the mixture with a non-coating area of ​​the substrate; a removing step of removing the solvent from the mixture applied in the applying step; a pressing step of press-molding the solid particles contained in the mixture from which the solvent has been removed onto the substrate, thereby bringing the solid particles into contact with the non-coated region of the substrate; A method for manufacturing an all-solid-state battery comprising:

2. the substrate is a positive electrode current collector layer, the solid particles are a positive electrode active material, The mixture is a positive electrode mixture. The method for producing the all-solid-state battery according to claim 1 .

3. In the coating step, at least a part of the coating area of ​​the substrate includes a line shape, a stripe shape, or a dot shape. The method for producing the all-solid-state battery according to claim 1 or 2.

4. In the removing step, the solvent is removed by heating. The method for producing the all-solid-state battery according to claim 1 or 2.

5. the mixture further comprises a binder; the solvent comprises anisole; The binder comprises polypropylene carbonate. The method for producing the all-solid-state battery according to claim 1 or 2.

6. In the coating step, the mixture having a tunnel-shaped groove formed therein is coated onto the coating area of ​​the substrate so as not to contact the non-coating area of ​​the substrate. The method for producing the all-solid-state battery according to claim 1 or 2.

7. In the coating step, an insulator is coated on the positive electrode current collector layer, In the pressing step, the insulator is press-molded to form an insulating layer on the positive electrode current collector layer. The method for producing the all-solid-state battery according to claim 2 .

8. the substrate is a negative electrode current collector layer, the solid particles are a negative electrode active material, The mixture is a negative electrode mixture. The method for producing the all-solid-state battery according to claim 1 .

Images